Powered by Deep Web Technologies
Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Fermi Award Winners Saluted | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Fermi Award Winners Saluted Fermi Award Winners Saluted Fermi Award Winners Saluted May 9, 2012 - 3:18pm Addthis President Barack Obama greets 2010 Fermi Award recipients Dr. Burton Richter, right, and his wife Laurose, and Dr. Mildred S. Dresselhaus, third from right, and her husband Gene, in the Oval Office, May 7, 2012. (Official White House Photo by Pete Souza) President Barack Obama greets 2010 Fermi Award recipients Dr. Burton Richter, right, and his wife Laurose, and Dr. Mildred S. Dresselhaus, third from right, and her husband Gene, in the Oval Office, May 7, 2012. (Official White House Photo by Pete Souza) Nafeesa Hunt Owens What is the Enrico Fermi Award? A Presidential award, the Fermi Award is one of the oldest and most prestigious science and technology honors bestowed by the U.S. Government.

2

Enrico Fermi Award Ceremony | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Enrico Fermi Award Ceremony Enrico Fermi Award Ceremony Enrico Fermi Award Ceremony June 22, 2006 - 2:31pm Addthis Remarks Prepared for Energy Secretary Samuel Bodman The Department of Energy has a very rich scientific tradition and one of the best things about being Energy Secretary is from time to time I have an opportunity to acknowledge that tradition and the very real impact it continues to have on the lives of all Americans.Today is one of those days. We are here to honor Art Rosenfeld with our nation's highest scientific honor: the Enrico Fermi award recognizing a lifetime of highly relevant and public-spirited work in the cause of energy efficiency as well as pioneering discoveries in experimental and particle physics and the generosity of spirit and intellectual rigor with which he has carried it

3

Enrico Fermi Award Ceremony | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Enrico Fermi Award Ceremony Enrico Fermi Award Ceremony Enrico Fermi Award Ceremony June 22, 2006 - 2:31pm Addthis Remarks Prepared for Energy Secretary Samuel Bodman The Department of Energy has a very rich scientific tradition and one of the best things about being Energy Secretary is from time to time I have an opportunity to acknowledge that tradition and the very real impact it continues to have on the lives of all Americans.Today is one of those days. We are here to honor Art Rosenfeld with our nation's highest scientific honor: the Enrico Fermi award recognizing a lifetime of highly relevant and public-spirited work in the cause of energy efficiency as well as pioneering discoveries in experimental and particle physics and the generosity of spirit and intellectual rigor with which he has carried it

4

The Enrico Fermi Award Homepage | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Home Home The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates Ceremony The Life of Enrico Fermi Contact Information The Enrico Fermi Award U.S. Department of Energy SC-2/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-9395 E: fermi.award@science.doe.gov Print Text Size: A A A RSS Feeds FeedbackShare Page Enrico Fermi Enrico Fermi On November 16, 1954, President Eisenhower and the Atomic Energy Commission honored Enrico Fermi with a special award for his lifetime of accomplishments in physics and, in particular, for his vital role in the development of atomic energy. Shortly after receiving this honor, Enrico Fermi succumbed to cancer at the age of 53. The Enrico Fermi Presidential Award was subsequently established in 1956 as a memorial to the legacy of

5

Enrico Fermi Award Nominations | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Enrico Fermi Enrico Fermi Award Nominations News Featured Articles Science Headlines 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 12.04.12 Enrico Fermi Award Nominations The Office of Science is now accepting nominations for the 2013 Enrico Fermi Award. Print Text Size: A A A Subscribe FeedbackShare Page Call for Nominations - 2013 Enrico Fermi Award Nominations are sought for the 2013 Enrico Fermi Award beginning now through May 31, 2013. The outcome of the 2012 Fermi Award is anticipated to be announced soon. The Enrico Fermi Award is a Presidential award and one of the longest running and most prestigious science and technology awards given by the

6

Secretary Chu Names 2009 Enrico Fermi Award Winners | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Names 2009 Enrico Fermi Award Winners Names 2009 Enrico Fermi Award Winners Secretary Chu Names 2009 Enrico Fermi Award Winners September 17, 2009 - 12:00am Addthis WASHINGTON, DC - US Energy Secretary Steven Chu has named Dr. John Bannister Goodenough and Dr. Siegfried S. Hecker as the winners of the Enrico Fermi Award, one of the most prestigious science and technology awards awarded by the U.S. Government. The Presidential award carries an honorarium of $375,000, which will be shared equally, and a gold medal. The award is administered on behalf of the White House by the U.S. Department of Energy. "The 2009 Enrico Fermi Award will go to two scientists who have selflessly devoted themselves to our nation's energy and national security challenges," said Secretary Chu. "These two individuals are pioneers in

7

President Obama Names Scientists Bard and Sessler as Enrico Fermi Award  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

President Obama Names Scientists Bard and Sessler as Enrico Fermi President Obama Names Scientists Bard and Sessler as Enrico Fermi Award Recipients President Obama Names Scientists Bard and Sessler as Enrico Fermi Award Recipients January 13, 2014 - 1:43pm Addthis NEWS MEDIA CONTACT (202)586-4940 WASHINGTON - President Obama has named Dr. Allen J. Bard and Dr. Andrew Sessler as recipients of the Enrico Fermi Award, one of the government's oldest and most prestigious awards for scientific achievement. The Presidential award carries an honorarium of $50,000, shared equally, and a medal. The award is administered on behalf of the White House by the U.S. Department of Energy. "Allen Bard and Andy Sessler have advanced the science and technology frontier throughout their distinguished careers and, in doing so, have contributed greatly to sustained US leadership in research and

8

U.S. Department of Energy, Secretary Chu Names 2009 Enrico Fermi Award  

Office of Scientific and Technical Information (OSTI)

September 17, 2009 September 17, 2009 Secretary Chu Names 2009 Enrico Fermi Award Winners University of Texas and Stanford University Professors to Share Presidential Award WASHINGTON, DC - US Energy Secretary Steven Chu has named Dr. John Bannister Goodenough and Dr. Siegfried S. Hecker as the winners of the Enrico Fermi Award, one of the most prestigious science and technology awards awarded by the U.S. Government. The Presidential award carries an honorarium of $375,000, which will be shared equally, and a gold medal. The award is administered on behalf of the White House by the U.S. Department of Energy. "The 2009 Enrico Fermi Award will go to two scientists who have selflessly devoted themselves to our nation's energy and national security challenges," said Secretary Chu. "These two individuals are

9

DOE Science Showcase - 2009 Enrico Fermi Award Winners | OSTI, US Dept of  

Office of Scientific and Technical Information (OSTI)

DOE Science Showcase - 2009 Enrico Fermi Award Winners DOE Science Showcase - 2009 Enrico Fermi Award Winners Find government research information related to 2009 Enrico Fermi Award Winners, including full-text technical reports, citations, project summaries and more. OSTI makes R&D information rapidly available to researchers and the public so that discovery can be accelerated. Dr. Goodenough's Research DOE R&D Accomplishments John B. Goodenough, Cathode Materials, and Rechargeable Lithium-ion Batteries Information Bridge Basic Research Needs for Electrical Energy Storage. Report of the Basic Energy Sciences Workshop on Electrical Energy Storage, April 2-4, 2007 Sign reversal of the MN-O bond compressibility in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} below T{sub C}: Exchange striction in the ferromagnetic state

10

Remembering Fermi  

SciTech Connect

A combination of the discovery of nuclear fission and the circumstances of the 2nd World War brought Enrico Fermi to Chicago, where he led the team that produced the first controlled, self-sustained nuclear chain reaction. Following the war in 1945 Chancellor Hutchins, William Zachariasen, and Walter Bartky convinced Fermi to accept a professorship at the University of Chicago, where the Institute for Nuclear Studies was established. Fermi served as the leading figure in surely the greatest collection of scientists the world has ever seen. Fermi's tenure at Chicago was cut short by his death in 1954. My talk will concentrate on the years 1945-54. Examples of his research notebooks, his speeches, his teaching, and his correspondence will be discussed.

Cronin, James (Enrico Fermi Institute, University of Chicago)

2005-03-30T23:59:59.000Z

11

Fermi Feud  

Energy.gov (U.S. Department of Energy (DOE))

Enrico Fermi was the first scientist to achieve a nuclear fission chain reaction when he and a group of young scientists were experimenting at the University of Chicago on December 2, 1942. Using a “Jeopardy” format, this game features energy, electricity and nuclear science answers and questions.

12

Manhattan Project: Enrico Fermi  

Office of Scientific and Technical Information (OSTI)

Enrico Fermi Events > Bringing it All Together, 1942-1945 > Basic Research at Los Alamos, Los Alamos: Laboratory, 1943-1944 Enrico Fermi...

13

Michigan Nuclear Profile - Fermi  

U.S. Energy Information Administration (EIA) Indexed Site

Fermi" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date"...

14

FermiNews  

NLE Websites -- All DOE Office Websites (Extended Search)

Jump to FermiNews back issues from 2003, 2002, 2001, 2000, 1999, 1998, 1997 or 1996. Jump to FermiNews back issues from 2003, 2002, 2001, 2000, 1999, 1998, 1997 or 1996. Adobe Acrobat readers are available free from Adobe at http://www.adobe.com/Acrobat/readstep.html . Readers are now available for Macintosh, Windows, SunOS, Solaris, HP-UX, Silicon Graphics IRIX, IBM AIX, and DOS. FermiNews Back Issues from 2004 June 1, 2004 Adobe Acrobat format HTML format No End In Sight Fermilab's Greatest Hits 26 Years of Quirks and Quarks The View From a Lens: Photographers Pick Their Favorites Hand-Crafting the News and Launching New Careers May 1, 2004 Adobe Acrobat format HTML format FermiNews Ends its Run Fermilab Prepares for its Future DASTOW '04: Wings and Wonders Time Exposure CDMS: New Dark Matter Result April 1, 2004 Adobe Acrobat format

15

Manhattan Project: Enrico Fermi  

Office of Scientific and Technical Information (OSTI)

Enrico Fermi Events > Early Government Support, 1939-1942 > Piles and Plutonium, 1939-1941 Events > The Plutonium Path to the Bomb, 1942-1944 > CP-1 Goes Critical, Met Lab,...

16

FermiNews  

NLE Websites -- All DOE Office Websites (Extended Search)

Dialogue: Communicating Particle Physics in the 21st Century Dialogue: Communicating Particle Physics in the 21st Century The un-common language of science - Does particle physics need to find new ways of describing itself? Related FermiNews story Dialogue - FermiNews readers express their views: On May 14, Charles Abney from Grand Prairie, Texas, writes: Ms,Sirs: I have just received and read the lattest fermi news publication that you sent by mail (05/10/2002). The gentlemen in the article proposes that particle physics be grouped with astronomy,cosmology, string physics, and gravitational waves be grouped under one Science. From my own prespective from what I have learned from this site, other related sites and what books that I have read through our library and or purchased, is that on the very core level the diffrent sciences are all

17

Enrico Fermi Patents  

NLE Websites -- All DOE Office Websites (Extended Search)

Patents Patents Fermi Home ¡ Resources with Additional Information ¡ Fermi Honored ¡ Atoms for Peace ¡ Centennial of Birth Marburger Speech ¡ Stamp ¡ Audio/Video Clips US PATENT 2,206,634 (Process for the Production of Radioactive Substances); E. Fermi, E. Amaldi, F. Rasetti, E. Segre, B. Pontecorvo; July 2, 1940. The process, for production of isotopes including transuranic elements by reaction of neutrons, employs means for generating neutrons having a high average energy, slowing down and scattering the neutrons by projecting them through a medium of an element of a class including H, He, Be, C, Si, and Pb, and then passing the neutrons into a mass of material containing an element capable of forming a radioactive isotope by neutron capture, including radioactive isotopes capable of emitting beta rays.

18

Fermilab | About FermiLINK  

NLE Websites -- All DOE Office Websites (Extended Search)

About FermiLINK About FermiLINK Fermilab Today September 28, 2009 Mentors wanted for Diversity Office's FermiLINK program Fermilab Today October 5, 2009 Mentors wanted for Diversity Office's FermiLINK program Fermilab Today October 13, 2009 FermiLINK Q&A session Fermilab Today November 9, 2009 FermiLINK calls for mentees FermiLINK is Fermilab’s mentorship system designed to create an organizational network of leaders by providing opportunities for professional development and career management. This support structure creates access to the counsel and institutional knowledge of successful Fermilab professionals independent of the immediate supervisory hierarchy. FermiLINK provides web-based access to a host of mentors for issue-specific work-related challenges and opportunities. The network supports email,

19

The Life of Enrico Fermi | U.S. DOE Office of Science (SC)  

NLE Websites -- All DOE Office Websites (Extended Search)

The Life of Enrico Fermi The Life of Enrico Fermi The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates Ceremony The Life of Enrico Fermi Contact Information The Enrico Fermi Award U.S. Department of Energy SC-2/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-9395 E: fermi.award@science.doe.gov The Life of Enrico Fermi Print Text Size: A A A RSS Feeds FeedbackShare Page Enrico Fermi Click for a story about the photograph On December 2, 1942, Enrico Fermi and his team of scientists harnessed the atom and opened the door to new scientific and technological realms. His achievement allowed the U.S. to produce the atomic bomb that helped end World War II. Now, more than fifty years later, nuclear energy provides a significant part of the world's electrical power, and radioactive materials

20

FermiLab  

NLE Websites -- All DOE Office Websites (Extended Search)

a high-energy physics laboratory, a high-energy physics laboratory, named after particle physicist pioneer Enrico Fermi, is located 30 miles west of Chicago. It is the home of the world's most powerful particle accelerator, the Tevatron, which was used to discover the top quark. For more information: Booster: There is a short linear accelerator and a 95 meter booster accelerator. Hydrogen is ionized (stripped of its electrons), leaving protons, which are accelerated to 8 GeV before injection into the main accelerator. Antiproton Production Protons are crashed into a target. Antiprotons found among the resulting particles are collected in the antiproton accumulator, and then sent in the opposite direction as the protons in the ring. Tevatron The main accelerator, the Tevatron is a synchrotron about 6.4

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Enrico Fermi Awards Ceremony for Dr. Mildred S. Dresselhaus and Dr. Burton Richter, May 2012 (Presentations, including remarks by Energy Secretary, Dr. Steven Chu)  

Science Conference Proceedings (OSTI)

The Fermi Award is a Presidential award and is one of the oldest and most prestigious science and technology honors bestowed by the U.S. Government. On May 7, 2012 it was conferred upon two exceptional scientists: Dr. Mildred Dresselhaus, 'for her scientific leadership, her major contributions to science and energy policy, her selfless work in science education and the advancement of diversity in the scientific workplace, and her highly original and impactful research,' and Dr. Burton Richter, 'for the breadth of his influence in the multiple disciplines of accelerator physics and particle physics, his profound scientific discoveries, his visionary leadership as SLAC Director, his leadership of science, and his notable contributions in energy and public policy.' Dr. John Holder, Director of the White House Office of Science and Technology Policy, opened the ceremony, and Dr. Bill Brinkman, Director of DOE's Office of Science introduced the main speaker, Dr. Steven Chu, U.S. Energy Secretary.

Chu, Steven (U.S. Energy Secretary)

2012-05-07T23:59:59.000Z

22

The Kerr-Fermi Sea  

E-Print Network (OSTI)

The presence of a massive scalar field near a Kerr black hole is known to produce instabilities associated with bound superradiant modes. In this paper we show that for massive fermions, rather than inducing an instability, the bound superradiant modes condense and form a Fermi sea which extends well outside the ergosphere. The shape of this Fermi sea in phase space and various other properties are analytically computed in the semiclassical WKB approximation. The low energy effective theory near the black hole is described by ripples in the Fermi surface. Expressions are derived for their dispersion relation and the effective force on particles which venture into the sea.

Hartman, Thomas; Strominger, Andrew

2009-01-01T23:59:59.000Z

23

The Kerr-Fermi Sea  

E-Print Network (OSTI)

The presence of a massive scalar field near a Kerr black hole is known to produce instabilities associated with bound superradiant modes. In this paper we show that for massive fermions, rather than inducing an instability, the bound superradiant modes condense and form a Fermi sea which extends well outside the ergosphere. The shape of this Fermi sea in phase space and various other properties are analytically computed in the semiclassical WKB approximation. The low energy effective theory near the black hole is described by ripples in the Fermi surface. Expressions are derived for their dispersion relation and the effective force on particles which venture into the sea.

Thomas Hartman; Wei Song; Andrew Strominger

2009-12-21T23:59:59.000Z

24

Fermi National Acceleratory Laboratory, Former Production Workers...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Laboratory, Former Production Workers Screening Projects Fermi National Acceleratory Laboratory, Former Production Workers Screening Projects...

25

FermiNews - May 2004  

NLE Websites -- All DOE Office Websites (Extended Search)

'04: Wings and Wonders Time Exposure CDMS: New Dark Matter Result Calendar and Milestones Chez Leon FermiNews archive Catherine Jordan - Photo by Reidar Hahn last modified 510...

26

Supersymmetry Breaking and Fermi Balls  

E-Print Network (OSTI)

A simple model is presented where the disappearance of domain walls and the associated production of ``Fermi balls'', which have been proposed as candidates for cold dark matter, are features which arise rather naturally in response to softly broken supersymmetry.

J. R. Morris; D. Bazeia

1996-07-22T23:59:59.000Z

27

FermiNews  

NLE Websites -- All DOE Office Websites (Extended Search)

Particle Physics for Regular People-Recommended Readings Particle Physics for Regular People-Recommended Readings A High-Energy Bookshelf to Brush Up Your Bosons Written By Mike Perricone, Office of Public Affairs for February 6, 1998 Issue of FermiNews. Psychologist Oliver Sacks has Robin Williams portraying him on screen. Cosmologist Carl Sagan's fictional heroine explores the universe in the glamorous guise of Jodie Foster. Biologist Stephen Jay Gould muses about the Red Sox in the PBS megadocumentary "Baseball." Where are all the particle physicists? They're on a high-energy bookshelf near you. The authors of the best plain-language literature in particle physics might not yet have reached stardom, but their books offer a literate, accessible and engaging introduction to a field of science that has been known to intimidate the uninitiated. The stories of the discoveries of the particles at the heart of matter offer all the thrills of a good chase-one of the biggest chases of 20th-century science. From the wide field available, readers can start with a half dozen of the "best of the best" books for gaining an understanding of the reason for all the excitement.

28

11FermiNews  

NLE Websites -- All DOE Office Websites (Extended Search)

E E y e w i t n e s s t o H i s t o r y 6 D i a l o g u e B o x 8 B l a c k b o a r d A r t 13 T h e Ta l k o f t h e L a b US/CMS Project 10 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, April 2, 1999 Number 7 f Photo by Reidar Hahn Ned Goldwasser was present at the beginnings of a great adventure in high-energy physics, but on a day dedicated to him, he couldnÕt forget that the cities were burning in that formative time for Fermi National Accelerator Laboratory. Not a building had yet been raised on the 6,800-acre site in March 1967, when the newly named director, Robert R. Wilson, telephoned Goldwasser, then at the University of Illinois, asking him to come on board with the project. Goldwasser, who had served on the committee recommending potential laboratory sites to the Atomic Energy Commission, took the job and agreed to

29

2013 Annual Planning Summary for the FERMI Site Office | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

FERMI Site Office 2013 Annual Planning Summary for the FERMI Site Office 2013 Annual Planning Summary for the FERMI Site Office The ongoing and projected Environmental Assessments...

30

"Doing Business with Argonne and Fermi National Laboratories...  

NLE Websites -- All DOE Office Websites (Extended Search)

"Doing Business with Argonne and Fermi National Laboratories" "Doing Business with Argonne and Fermi National Laboratories" 1 of 42 "Doing Business with Argonne and Fermi...

31

FermiNews - August 30 2002  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermi National Laboratory Volume 25 | Friday, August 30, 2002 | Number 14 In This Issue | FermiNews Main Page Flying Without a Net In which a public affairs intern emabarks upon a...

32

Fermi National Accelerator Laboratory Technology Marketing ...  

Fermi National Accelerator Laboratory Technology Marketing Summaries. Here you’ll find marketing summaries for technologies available for licensing ...

33

Fermi National Accelerator Laboratory Technologies Available ...  

... Energy Innovation Portal on Google; Bookmark Fermi National Accelerator Laboratory Technologies Available for Licensing - Energy Innovation Portal ...

34

FermiCulture Subscription Form  

NLE Websites -- All DOE Office Websites (Extended Search)

The FermiCulture email list is used to send email announcements and reminders about upcoming cultural events at Fermilab (e.g., the Fermilab Arts, Film, and Lecture series). This is a private, announcement-only mail list and will never be used for spamming or discussions. Subscribers receive approximately five emails per month. Use the form below to subscribe to (or unsubscribe from) the FermiCulture list. The FermiCulture email list is used to send email announcements and reminders about upcoming cultural events at Fermilab (e.g., the Fermilab Arts, Film, and Lecture series). This is a private, announcement-only mail list and will never be used for spamming or discussions. Subscribers receive approximately five emails per month. Use the form below to subscribe to (or unsubscribe from) the FermiCulture list. Email address: Name (First Last): Subscribe to email list Unsubscribe from email list Send Reset The Regular Mailing List If you would like to receive mailings through the regular mail of upcoming cultural events at Fermilab and are not on our mailing list, then please fill out the information below. Name: Address: City: State: Zip: Country: E-mail:

35

Damping of IVGDR - Fermi-liquid or Fermi-gas ?  

E-Print Network (OSTI)

Collisional relaxation rates of collective modes in nuclei are calculated using the Levinson equation for the reduced density matrix with a memory dependent collision term. Linearizing the collision integral two contribution have to be distinguished, the one from the quasiparticle energy and the one from occupation factors. The first one yields the known Landau formula of zero sound damping and the second one leads to the Fermi gas model of Ref.1 with the additional factor 3 in front of the frequencies. Adding both contribution we obtain a final relaxation rate for the Fermi liquid model. Calculations of the temperature dependence of the damping rates and of the shape evolution of IVGDR are in good agreement with the experiment and show only minor differences between both models.

Klaus Morawetz; Uwe Fuhrmann

1999-07-05T23:59:59.000Z

36

FermiNews - June 16, 2000  

NLE Websites -- All DOE Office Websites (Extended Search)

and Industry Groundbreaking in Extreme Conditions Before and After Antiproton Upgrade Wood Visits NTF Calendar and Milestones Classifieds Return to FermiNews archive...

37

Isospin Transport at Fermi Energies  

E-Print Network (OSTI)

In this paper we investigate isospin transport mechanisms in semi-peripheral collisions at Fermi energies. The effects of the formation of a low density region (neck) between the two reaction partners and of pre-equilibrium emission on the dynamics of isospin equilibration are carefully analyzed. We clearly identify two main contributions to the isospin transport: isospin diffusion due to the $N/Z$ ratio and isospin drift due to the density gradients. Both effects are sensitive to the symmetry part of the nuclear Equation of State (EOS), in particular to the value and slope around saturation density.

V. Baran; M. Colonna; M. Di Toro; M. Zielinska-Pfabe; H. H. Wolter

2005-06-28T23:59:59.000Z

38

Fermi Observations of Gamma?ray Bursts  

Science Conference Proceedings (OSTI)

The gamma?ray emission mechanism of Gamma?ray bursts (GRBs) are still unknown. Fermi Gamma?ray Space Telescope successfully detected high?energy (> 100 MeV) emission from 17 GRBs since its launch. Fermi revealed the distinct temporal behaviors and extra spectral component from high?energy emission. These new observational results are driving many theoretical implications

Masanori Ohno; The Fermi?LAT collaborations; The GBM collaborations

2010-01-01T23:59:59.000Z

39

SLAC National Accelerator Laboratory - Fermi's Latest Gamma-ray...  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermi's Latest Gamma-ray Census Highlights Cosmic Mysteries By Francis Reddy, NASAGoddard Space Flight Center September 9, 2011 Every three hours, NASA's Fermi Gamma-ray Space...

40

Fermi Surface of Uranium at Ambient Pressure Gregory S. Boebinger, National High Magnetic Field Laboratory  

E-Print Network (OSTI)

Fermi Surface of ­Uranium at Ambient Pressure Gregory S. Boebinger, National High Magnetic Field Laboratory DMR-Award 0654118 DC Field Facility User Program The fermi surface of ­Uranium has been measured surface of alpha-uranium at ambient pressure, Phys. Rev. B Rapid Commun., 80, 241101 (2009). B//c-axis B

Weston, Ken

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Non-Fermi liquids from holography  

SciTech Connect

We report on a potentially new class of non-Fermi liquids in (2+1)-dimensions. They are identified via the response functions of composite fermionic operators in a class of strongly interacting quantum field theories at finite density, computed using the AdS/CFT correspondence. We find strong evidence of Fermi surfaces: gapless fermionic excitations at discrete shells in momentum space. The spectral weight exhibits novel phenomena, including particle-hole asymmetry, discrete scale invariance, and scaling behavior consistent with that of a critical Fermi surface postulated by Senthil.

Liu Hong; McGreevy, John; Vegh, David [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2011-03-15T23:59:59.000Z

42

11 Fermi 2/2/01  

NLE Websites -- All DOE Office Websites (Extended Search)

7 chain reaction with the Manhattan Project, the U.S. effort to build the first atomic bomb. The stamp art includes a colorized black-and-white photograph of Fermi taken in 1948...

43

Enrico Fermi: Audio/Video Clips  

Office of Scientific and Technical Information (OSTI)

Audio/Video Clips Audio/Video Clips Fermi Home ¡ Resources with Additional Information ¡ Fermi Honored ¡ Atoms for Peace ¡ Centennial of Birth Marburger Speech ¡ Stamp ¡ Patents Video Clip Fermi's account of the first nuclear chain reaction on December 2,1942 (from the colloquium of the 10th Anniversary of the event), with artwork of the reactor by Argonne National Laboratory (ANL). Due to the secrecy of the event, no photographs were taken of the reactor. Introduction by Crawford Greenwalt. Courtesy of ANL (5749K; 3 minutes, 50 seconds) Download Flash for video. Horizontal Divider Audio Clips Download QuickTime for audio files. From "Century of the Atom," produced by the U.S. Atomic Energy Commission Alternative cannot be provided. Download QuickTime Ten years after the experiment, Fermi recalls his confidence in the success of the first self-sustaining chain reaction. (197K; 23 seconds)

44

Fermi Observations of Gamma-ray Bursts  

SciTech Connect

The gamma-ray emission mechanism of Gamma-ray bursts (GRBs) are still unknown. Fermi Gamma-ray Space Telescope successfully detected high-energy (> 100 MeV) emission from 17 GRBs since its launch. Fermi revealed the distinct temporal behaviors and extra spectral component from high-energy emission. These new observational results are driving many theoretical implications, such as leptonic, hadronic and afterglow origin. The highest energy photon detected by Fermi gives a constraint on the bulk Lorentz factor of the ultra-relativistic jets of GRBs. The impact of the Fermi GRB observations extends not only to the GRB-related issues but also to the outside GRB physics, such as quantum gravity and model of the extra galactic background light.

Ohno, Masanori [Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)

2010-10-15T23:59:59.000Z

45

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

September 20, 2002 September 20, 2002 Number 15 f I N S I D E : 6 L a s t R i t e s 8 F Y I 1 2 C o m p u t i n g b y t h e Tr u c k l o a d Jeff Kallenbach, Fermilab and Jon Link, BooNE collaboration New Neutrino Experiment at Fermilab Goes Live 2 2 FERMINEWS Friday, September 20, 2002 Scientists of the Booster Neutrino Experiment collaboration announced on September 9 that a new detector at the U.S. Department of Energy's Fermi National Accelerator Laboratory has observed its first neutrino events. The BooNE scientists identified neutrinos that created ring-shaped flashes of light inside a 250,000-gallon detector filled with mineral oil. The major goal of the MiniBooNE experiment, the first phase of the BooNE project, is either to confirm or refute startling experimental results reported by a group of scientists at the Los Alamos National Laboratory. In 1995, the

46

Pseudogap Pairing in Ultracold Fermi Atoms  

Science Conference Proceedings (OSTI)

The Bose-Einstein condensate to Bardeen-Cooper-Schrieffer crossover in ultracold Fermi gases creates an ideal environment to enrich our knowledge of many-body systems. It is relevant to a wide range of fields from condensed matter to astrophysics. The nature of pairing in strongly interacting Fermi gases can be readily studied. This aids our understanding of related problems in high-T{sub c} superconductors, whose mechanism is still under debate due to the large interaction parameter. Here, we calculate the dynamical properties of a normal, trapped strongly correlated Fermi gas, by developing a quantum cluster expansion. Our calculations for the single-particle spectral function agree with recent rf spectroscopy measurements, and clearly demonstrate pseudogap pairing in the strongly interacting regime.

Hu Hui; Liu Xiaji; Drummond, Peter D. [ARC Centre of Excellence for Quantum-Atom Optics and Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia); Dong Hui [ARC Centre of Excellence for Quantum-Atom Optics and Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia); Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 (China)

2010-06-18T23:59:59.000Z

47

Renormalization group flow for noncommutative Fermi liquids  

Science Conference Proceedings (OSTI)

Some recent studies of the AdS/CFT correspondence for condensed matter systems involve the Fermi liquid theory as a boundary field theory. Adding B-flux to the boundary D-branes leads in a certain limit to the noncommutative Fermi liquid, which calls for a field theory description of its critical behavior. As a preliminary step to more general consideration, the modification of the Landau's Fermi liquid theory due to noncommutativity of spatial coordinates is studied in this paper. We carry out the renormalization of interactions at tree level and one loop in a weakly coupled fermion system in two spatial dimensions. Channels ZS, ZS' and BCS are discussed in detail. It is shown that while the Gaussian fixed-point remains unchanged, the BCS instability is modified due to the space noncommutativity.

Estrada-Jimenez, Sendic [Centro de Estudios en Fisica y Matematicas Basicas y Aplicadas, Universidad Autonoma de Chiapas, Calle 4a Oriente Norte 1428 Tuxtla Gutierrez, Chiapas (Mexico); Garcia-Compean, Hugo [Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN P.O. Box 14-740, 07000 Mexico D.F. (Mexico); Wu Yongshi [Department of Physics and Astronomy, University of Utah Salt Lake City, Utah 84112 (United States); Department of Physics, Fudan University, Shanghai 200433 (China)

2011-06-15T23:59:59.000Z

48

Soliton trains in Bose-Fermi mixtures  

E-Print Network (OSTI)

We theoretically consider the formation of bright solitons in a mixture of Bose and Fermi degenerate gases. While we assume the forces between atoms in a pure Bose component to be effectively repulsive, their character can be changed from repulsive to attractive in the presence of fermions provided the Bose and Fermi gases attract each other strongly enough. In such a regime the Bose component becomes a gas of effectively attractive atoms. Hence, generating bright solitons in the bosonic gas is possible. Indeed, after a sudden increase of the strength of attraction between bosons and fermions (realized by using a Feshbach resonance technique or by firm radial squeezing of both samples) soliton trains appear in the Bose-Fermi mixture.

T. Karpiuk; M. Brewczyk; S. Ospelkaus-Schwarzer; K. Bongs; M. Gajda; K. Rzazewski

2004-04-14T23:59:59.000Z

49

Traveling dark solitons in superfluid Fermi gases  

SciTech Connect

Families of dark solitons exist in superfluid Fermi gases. The energy-velocity dispersion and number of depleted particles completely determine the dynamics of dark solitons on a slowly varying background density. For the unitary Fermi gas, we determine these relations from general scaling arguments and conservation of local particle number. We find solitons to oscillate sinusoidally at the trap frequency reduced by a factor of 1/{radical}(3). Numerical integration of the time-dependent Bogoliubov-de Gennes equation determines spatial profiles and soliton-dispersion relations across the BEC-BCS crossover, and proves consistent with the scaling relations at unitarity.

Liao Renyuan; Brand, Joachim [New Zealand Institute for Advanced Study and Centre for Theoretical Chemistry and Physics, Massey University, Private Bag 102904 NSMC, Auckland 0745 (New Zealand)

2011-04-15T23:59:59.000Z

50

SLAC National Accelerator Laboratory - Seen Around SLAC: Fermi...  

NLE Websites -- All DOE Office Websites (Extended Search)

Seen Around SLAC: Fermi Telescope Model Flies Over Kavli Lobby By Lori Ann White October 26, 2011 A half-sized Fermi space telescope model, originally launched from SLAC's booth at...

51

Fermi Site Office Post Office Box 2000  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Fermi Site Office Fermi Site Office Post Office Box 2000 Batavia, Illinois 60510 JAN 14 2011 Scott Blake Harris, General Counsel GC-1 FORS SUBJECT: FERMl SITE OFFICE (FSO) 201 1 ANNUAL NATIONAL ENVIRONMENTAL POLICY ACT (NEPA) PLANNING SUIMMARY The Department of Energy (DOE) Order 451 .I B, Change 2, requires Secretarial Officers and Heads of Field Organizations to submit a NEPA Annual Planning Summary to the Office of General Counsel. Per your December 8, 2010 memorandum and guidance provided by the Office of NEPA Policy and Compliance (GC-54), our Annual NEPA Planning Summary is enclosed. We have identified one on-going environmental assessment (EA). No environmental impact statements (EISs) are on-going and two new EAs and one EIS are expected to be prepared beginning in the next 12 to 24 months.

52

Fermi excitations in a trapped atomic Fermi gas with a molecular Bose condensate  

E-Print Network (OSTI)

We discuss the effect of a molecular Bose condensate on the energy of Fermi excitations in a trapped two-component atomic Fermi gas. The single-particle Green's functions can be approximated by the well-known BCS form, in both the BCS (Cooper pairs) and BEC (Feshbach resonance molecules) domains. The composite Bose order parameter ${\\tilde \\Delta}$ describing bound states of two atoms and the Fermi chemical potential $\\mu$ are calculated self-consistently. In the BEC regime characterized by $\\muenergy gap is given by $\\sqrt{\\mu^2+{\\tilde \\Delta}^2}$, instead of $|{\\tilde \\Delta}|$ in the BCS region, where $\\mu>0$. This shows up in the characteristic energy of atoms from dissociated molecules.

Y. Ohashi; A. Griffin

2004-02-02T23:59:59.000Z

53

Categorical Exclusion Determinations: Fermi Site Office | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Fermi Site Office Fermi Site Office Categorical Exclusion Determinations: Fermi Site Office Categorical Exclusion Determinations issued by Fermi Site Office. DOCUMENTS AVAILABLE FOR DOWNLOAD June 7, 2013 CX-010532: Categorical Exclusion Determination Various Demolition Jobs CX(s) Applied: B1.23 Date: 06/07/2013 Location(s): Illinois Offices(s): Fermi Site Office March 27, 2013 CX-010387: Categorical Exclusion Determination The Geotechnical Investigation of the Long Baseline Neutrino Experiment Detector Site in South Dakota CX(s) Applied: B3.1 Date: 03/27/2013 Location(s): South Dakota Offices(s): Fermi Site Office February 20, 2013 CX-010388: Categorical Exclusion Determination Northern Illinois Center for Accelerator and Detector Development Extrusion Line Facility CX(s) Applied: B1.15

54

2011 Annual Planning Summary for Fermi Site Office (FSO)  

Energy.gov (U.S. Department of Energy (DOE))

The ongoing and projected Environmental Assessments and Environmental Impact Statements for 2011 and 2012 within the Fermi Site Office (See Science APS).

55

Enrico Fermi Achieves First Self Sustain Nuclear Chain Reaction...  

National Nuclear Security Administration (NNSA)

Achieves First Self Sustain Nuclear Chain Reaction Metallurgical Laboratory scientists led by Enrico Fermi achieve the first self-sustained nuclear chain reaction in pile...

56

The free states-related Fermi pocket of cuprate superconductors  

E-Print Network (OSTI)

To stress the effect of the pairing position deviating from the Fermi level, we must investigate the pairs in the wave vector space, and then we use the dynamic equation to study some correlation functions. This article shows that the Fermi pocket is related to the effect of free electron states on the ARPES experiment. This also leads us to understand why the Fermi arc appears in Bi2212 while the Fermi pocket appears in Bi2201 with the valence bandwidth and the work function known for them.

Tian De Cao

2010-01-01T23:59:59.000Z

57

FermiNews - December 11, 1998  

NLE Websites -- All DOE Office Websites (Extended Search)

December 11, 1998 | Number 23 December 11, 1998 | Number 23 FermiNews Main Page Response in FermiNews, 05/12/2000 Santa and sleigh Santa at Nearly the Speed of Light by Arnold Pompos, Purdue University, and Sharon Butler, Office of Public Affairs About this time of year, inquisitive children of a certain age begin to question whether Santa is real. After all, Santa has a major delivery problem. There are some 2 billion children in the world expecting Christmas presents. Assuming an average of 2.5 children per household, then, Santa has to visit about 800 million homes scattered about the globe. The distance Santa has to travel can be estimated from the following. First, while the surface area of Earth is about 1014 square meters, only about 30 percent of that is land mass, or about 0.3 x 1014 square meters. Second, we’ll assume, for simplicity’s sake, that the 800 million homes are equally distributed on this land mass. Dividing 0.3 x 1014 by 800 million gives 4 x 104 square meters occupied by every household (about six football fields); the square root of that is the distance between households, about 200 meters. Multiply this by the 800 million households to get the distance Santa must travel on Christmas Eve to deliver all the children’s gifts: 160 million kilometers, farther than the distance from here to the sun.

58

Fermi Liquid Instabilities in the Spin Channel  

SciTech Connect

We study the Fermi surface instabilities of the Pomeranchuk type in the spin triplet channel with high orbital partial waves (F{sub l}{sup a} (l > 0)). The ordered phases are classified into two classes, dubbed the {alpha} and {beta}-phases by analogy to the superfluid {sup 3}He-A and B-phases. The Fermi surfaces in the {alpha}-phases exhibit spontaneous anisotropic distortions, while those in the {beta}-phases remain circular or spherical with topologically non-trivial spin configurations in momentum space. In the {alpha}-phase, the Goldstone modes in the density channel exhibit anisotropic overdamping. The Goldstone modes in the spin channel have nearly isotropic underdamped dispersion relation at small propagating wavevectors. Due to the coupling to the Goldstone modes, the spin wave spectrum develops resonance peaks in both the {alpha} and {beta}-phases, which can be detected in inelastic neutron scattering experiments. In the p-wave channel {beta}-phase, a chiral ground state inhomogeneity is spontaneously generated due to a Lifshitz-like instability in the originally nonchiral systems. Possible experiments to detect these phases are discussed.

Wu, Congjun; /Santa Barbara, KITP; Sun, Kai; Fradkin, Eduardo; /Illinois U., Urbana; Zhang, Shou-Cheng; /Stanford U., Phys. Dept.

2010-03-16T23:59:59.000Z

59

ABJM theory as a Fermi gas  

E-Print Network (OSTI)

The partition function on the three-sphere of many supersymmetric Chern-Simons-matter theories reduces, by localization, to a matrix model. We develop a new method to study these models in the M-theory limit, but at all orders in the 1/N expansion. The method is based on reformulating the matrix model as the partition function of an ideal Fermi gas with a non-trivial, one-particle quantum Hamiltonian. This new approach leads to a completely elementary derivation of the N^{3/2} behavior for ABJM theory and N=3 quiver Chern-Simons-matter theories. In addition, the full series of 1/N corrections to the original matrix integral can be simply determined by a next-to-leading calculation in the WKB or semiclassical expansion of the quantum gas, and we show that, for several quiver Chern-Simons-matter theories, it is given by an Airy function. This generalizes a recent result of Fuji, Hirano and Moriyama for ABJM theory. It turns out that the semiclassical expansion of the Fermi gas corresponds to a strong coupling expansion in type IIA theory, and it is dual to the genus expansion. This allows us to calculate explicitly non-perturbative effects due to D2-brane instantons in the AdS background.

Marcos Marino; Pavel Putrov

2011-10-18T23:59:59.000Z

60

Fermi LAT Observations of LS 5039  

SciTech Connect

The first results from observations of the high-mass X-ray binary LS 5039 using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009 June are presented. Our results indicate variability that is consistent with the binary period, with the emission being modulated with a period of 3.903 {+-} 0.005 days; the first detection of this modulation at GeV energies. The light curve is characterized by a broad peak around superior conjunction in agreement with inverse Compton scattering models. The spectrum is represented by a power law with an exponential cutoff, yielding an overall flux (100 MeV-300 GeV) of 4.9 {+-} 0.5(stat) {+-} 1.8(syst) x 10{sup -7} photon cm{sup -2} s{sup -1}, with a cutoff at 2.1 {+-} 0.3(stat) {+-} 1.1(syst) GeV and photon index {Gamma} = 1.9 {+-} 0.1(stat) {+-} 0.3(syst). The spectrum is observed to vary with orbital phase, specifically between inferior and superior conjunction. We suggest that the presence of a cutoff in the spectrum may be indicative of magnetospheric emission similar to the emission seen in many pulsars by Fermi.

Abdo, A.A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U. /Stockholm U., OKC; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Blandford, R.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique /Washington U., Seattle /Padua U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /Milan Polytechnic /DAPNIA, Saclay /ASDC, Frascati /INFN, Perugia /Perugia U. /NASA, Goddard /NASA, Goddard /CSST, Baltimore /DAPNIA, Saclay /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Sonoma State U. /Stockholm U. /Stockholm U., OKC /DAPNIA, Saclay /NASA, Goddard /CSST, Baltimore /SLAC /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /SLAC /Grenoble Observ. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U.; /more authors..

2012-03-29T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

9 Fermi 10/20/00  

NLE Websites -- All DOE Office Websites (Extended Search)

20, 2000 20, 2000 Number 18 f Photo by Reidar Hahn I N S I D E : 4 S a v i n g t h e D a y 6 K e e p i n g i t C o o l 1 0 C o n t i n u i n g E d u c a t i o n i n t h e M a i n C o n t r o l R o o m 1 2 F a m o u s i n S i c i l y 1 4 F e r m i l a b Aw a r d W i n n e r s Millie Comes to Fermilab 2 Millie f Comes to Fermilab 2 FERMINEWS October 20, 2000 by Judy Jackson It was a special pleasure, Millie Dresselhaus said, to visit the physics laboratory named in honor of her former teacher at the University of Chicago, Enrico Fermi. During her September 27-28 visit to Fermilab for an onsite DOE review of the laboratory, Dresselhaus, director of the Department of EnergyÕs Office of Science, spoke with respect and affection of the professor she knew during her years as a University of Chicago graduate student, She referred often to FermiÕs legendary concern for graduate students and young physicists.

62

Enrico Fermi's Impact on Science - John Marburger Speech  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermi Home ¡ Resources with Additional Information ¡ Fermi Honored ¡ Atoms for Peace ¡ Centennial of Birth Fermi Home ¡ Resources with Additional Information ¡ Fermi Honored ¡ Atoms for Peace ¡ Centennial of Birth Stamp ¡ Patents ¡ Audio/Video Clips Enrico Fermi's Impact on Science Address given at the Italian Embassy Washington, D.C. Centennial Celebration of the Birth of Enrico Fermi November 27, 2001 Dr. John H. Marburger III President's Science Adviser and Director, Office of Science and Technology Policy It is a great honor to be invited to speak of Enrico Fermi on the occasion of his centennial birthday. Fermi was a physicist's physicist whose legacy was one of style as well of substance - a style so attractive and so productive for science that it became substantive in itself. I thank Secretary Abraham, Deputy Secretary Blake and Ambassador Salleo for this unique opportunity to pay tribute to one of the giants of twentieth century intellectual life. It is also an honor to share the program with three other eminent scientists and administrators, Daniele Amati, Luciano Maiani and Harold Agnew.

63

''Where is everybody. '' An account of Fermi's question  

SciTech Connect

Fermi's famous question, now central to debates about the prevalence of extraterrestrial civilizations, arose during a luncheon conversation with Emil Konopinski, Edward Teller, and Herbert York in the summer of 1950. Fermi's companions on that day have provided accounts of the incident.

Jones, E.M.

1985-03-01T23:59:59.000Z

64

"Where is Everybody?" An Account of Fermi's Question  

DOE R&D Accomplishments (OSTI)

Enrico Fermi's famous question, now central to debates about the prevalence of extraterrestrial civilizations, arose during a luncheon conversation with Emil Konopinski, Edward Teller, and Herbert York in the summer of 1950. Fermi's companions on that day have provided accounts of the incident.

Jones, E. M.

1985-03-01T23:59:59.000Z

65

Umklapp Lasing with a Quantum Degenerate Fermi Gas  

E-Print Network (OSTI)

We introduce the driven quantum degenerate Fermi gas as a lasing medium in optical cavities. We show that the existence of a Fermi surface fundamentally alters the behavior of the charge-ordering ("self-organization") superradiant transition that occurs when the atoms are driven sufficiently strongly. Resonant Umklapp scattering processes, where the fermions are scattered from one side of the Fermi surface to the other by exchanging photon momenta, lead to Peierls reconstruction of the dynamical cavity band structure at low superradiance threshold. The spectral properties of the cavity light field can be tuned by the Fermi wavevector (the density of the gas) relative to the cavity and pump photon momenta. The cavity spectrum can have broadband features from the fermionic particle-hole continuum as well as frequency ranges with narrow linewidth due to dispersive effects of the Fermi gas.

Francesco Piazza; Philipp Strack

2013-09-11T23:59:59.000Z

66

FermiNews - November 10, 2000  

NLE Websites -- All DOE Office Websites (Extended Search)

3 | Friday, November 10, 2000 | Number 19 3 | Friday, November 10, 2000 | Number 19 In This Issue | FermiNews Main Page LHC Magnet: From Model to Prototype by Kurt Riesselmann Paul Mayer checks one of the leads to a coil prior to final assembly of the magnet Magnets are crucial components of every particle accelerator around the world. Like tracks guiding trains, they force charged particles to follow a path prescribed by magnetic forces. The higher the energy of the particles, the stronger the magnetic forces needed to steer them around a ring. The Large Hadron Collider, which will be the world's most powerful particle accelerator when finished in 2005, will feature the world's largest assembly of powerful magnets. Thousands of magnets will assure that protons, traveling at almost the speed of light, will stay on track as they zip around a 17-mile-long circular track at CERN, the European particle physics laboratory near Geneva, Switzerland.

67

I Fermi National Accelerator Laboratory I I  

NLE Websites -- All DOE Office Websites (Extended Search)

b b .?.? ... . . 1- \r I Fermi National Accelerator Laboratory I I FERMILAB-Cdnf-76 159 -EXP 2 020,000 2 02 2.000 I 1 (Submitted to the Neutrino I 9 76 Conference Aachen, Germany June 8r-13, -1976) * I 4 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or

68

Relativistic Fermi acceleration with shock compressed turbulence  

E-Print Network (OSTI)

This paper presents numerical simulations of test particle Fermi acceleration at relativistic shocks of Lorentz factor Gamma_sh = 2-60, using a realistic downstream magnetic structure obtained from the shock jump conditions. The upstream magnetic field is described as pure Kolmogorov turbulence; the corresponding downstream magnetic field lies predominantly in the plane tangential to the shock surface and the coherence length is smaller along the shock normal than in the tangential plane. Acceleration is nonetheless efficient and leads to powerlaw spectra with index s = 2.6-2.7 at large shock Lorentz factor Gamma_sh >> 1, markedly steeper than for isotropic scattering downstream. The acceleration timescale t_acc in the upstream rest frame becomes a fraction of Larmor time t_L in the ultra-relativistic limit, t_acc ~ 10 t_L/Gamma_sh. Astrophysical applications are discussed, in particular the acceleration in gamma-ray bursts internal and external shocks.

Martin Lemoine; Benoit Revenu

2005-10-18T23:59:59.000Z

69

Non-Fermi liquids and the Wiedemann-Franz law  

E-Print Network (OSTI)

A general discussion of the ratio of thermal and electrical conductivities in non-Fermi liquid metals is given. In metals with sharp Drude peaks, the relevant physics is correctly organized around the slow relaxation of almost-conserved momenta. While in Fermi liquids both currents and momenta relax slowly, due to the weakness of interactions among low energy excitations, in strongly interacting non-Fermi liquids typically only momenta relax slowly. It follows that the conductivities of such non-Fermi liquids are obtained within a fundamentally different kinematics to Fermi liquids. Among these strongly interacting non-Fermi liquids we distinguish cases with only one almost-conserved momentum, which we term hydrodynamic metals, and with many patchwise almost-conserved momenta. For all these cases, we obtain universal expressions for the ratio of conductivities that violate the Wiedemann-Franz law. We further discuss the case in which long-lived `cold' quasiparticles, in general with unconventional scattering rates, coexist with strongly interacting hot spots, lines or bands. For these cases, we characterize circumstances under which non-Fermi liquid transport, in particular a linear in temperature resistivity, is and is not compatible with the Wiedemann-Franz law. We suggest the likely outcome of future transport experiments on CeCoIn5, YbRh2Si2 and Sr3Ru2O7 at their critical magnetic fields.

Raghu Mahajan; Maissam Barkeshli; Sean A. Hartnoll

2013-04-15T23:59:59.000Z

70

Enrico Fermi Achieves First Self Sustain Nuclear Chain Reaction | National  

National Nuclear Security Administration (NNSA)

Enrico Fermi Achieves First Self Sustain Nuclear Chain Reaction | National Enrico Fermi Achieves First Self Sustain Nuclear Chain Reaction | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Enrico Fermi Achieves First Self Sustain Nuclear ... Enrico Fermi Achieves First Self Sustain Nuclear Chain Reaction

71

DOE - Office of Legacy Management -- Fermi National Accelerator Laboratory  

Office of Legacy Management (LM)

Fermi National Accelerator Fermi National Accelerator Laboratory - 016 FUSRAP Considered Sites Site: Fermi National Accelerator Laboratory (016) Designated Name: Alternate Name: Location: Evaluation Year: Site Operations: Site Disposition: Radioactive Materials Handled: Primary Radioactive Materials Handled: Radiological Survey(s): Site Status: This site began it's mission as a single-program research and development facility for the Atomic Energy Commission in 1972, when the first accelerator at the Laboratory began operations. The LaboratoryÂżs current mission is to conduct research in high energy physics under the direction of the Department of Energy's Office of Science. Clean-up of contamination at the site was completed in 1997. Also see Documents Related to Fermi National Accelerator Laboratory

72

Running fermi with one-stage compressor: advantages, layout, performance  

E-Print Network (OSTI)

Running FERMI with one-stage compressor: advantages, layout,a lattice with one-stage compressor, it was thought at thetime that the two bunch compressors configuration was still

Cornacchia, M.; Craievich, P.; Di Mitri, S.; Penco, G.; Venturini, M.; Zholents, A.

2008-01-01T23:59:59.000Z

73

Fermi gases in one dimension: From Bethe Ansatz to experiments  

E-Print Network (OSTI)

This article reviews theoretical and experimental developments for one-dimensional Fermi gases. Specifically, the experimentally realized two-component delta-function interacting Fermi gas -- the Gaudin-Yang model -- and its generalisations to multi-component Fermi systems with larger spin symmetries. The exact results obtained for Bethe ansatz integrable models of this kind enable the study of the nature and microscopic origin of a wide range of quantum many-body phenomena driven by spin population imbalance, dynamical interactions and magnetic fields. This physics includes Bardeen-Cooper-Schrieffer-like pairing, Tomonaga-Luttinger liquids, spin-charge separation, Fulde-Ferrel-Larkin-Ovchinnikov-like pair correlations, quantum criticality and scaling, polarons and the few-body physics of the trimer state (trions). The fascinating interplay between exactly solved models and experimental developments in one dimension promises to yield further insight into the exciting and fundamental physics of interacting Fermi systems.

Xi-Wen Guan; Murray T. Batchelor; Chaohong Lee

2013-01-28T23:59:59.000Z

74

SLAC National Accelerator Laboratory - Fermi Sees Record Gamma...  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermi Sees Record Gamma-ray Burst May 3, 2013 A record-setting blast of gamma rays from a dying star in a distant galaxy has wowed astronomers around the world. The eruption, which...

75

Renormalization group and the superconducting susceptibility of a Fermi liquid  

Science Conference Proceedings (OSTI)

A free Fermi gas has, famously, a superconducting susceptibility that diverges logarithmically at zero temperature. In this paper we ask whether this is still true for a Fermi liquid and find that the answer is that it does not. From the perspective of the renormalization group for interacting fermions, the question arises because a repulsive interaction in the Cooper channel is a marginally irrelevant operator at the Fermi liquid fixed point and thus is also expected to infect various physical quantities with logarithms. Somewhat surprisingly, at least from the renormalization group viewpoint, the result for the superconducting susceptibility is that two logarithms are not better than one. In the course of this investigation we derive a Callan-Symanzik equation for the repulsive Fermi liquid using the momentum-shell renormalization group, and use it to compute the long-wavelength behavior of the superconducting correlation function in the emergent low-energy theory. We expect this technique to be of broader interest.

Parameswaran, S. A.; Sondhi, S. L. [Department of Physics, Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544 (United States); Shankar, R. [Department of Physics, Yale University, New Haven, Connecticut 06520 (United States)

2010-11-15T23:59:59.000Z

76

Superconductivity with deformed Fermi surfaces and compact stars  

E-Print Network (OSTI)

I discuss the deformed Fermi surface superconductivity (DFS) and some of its alternatives in the context of nucleonic superfluids and two flavor color superconductors that may exist in the densest regions of compact stellar objects.

Armen Sedrakian

2003-12-15T23:59:59.000Z

77

Argonne, Fermi national laboratories to welcome local businesses...  

NLE Websites -- All DOE Office Websites (Extended Search)

Argonne, Fermi national laboratories to welcome local businesses Aug. 21 August 15, 2013 Tweet EmailPrint LEMONT, Ill. - On Wednesday, Aug. 21, 2013, the U.S. Department of...

78

Radio-frequency spectroscopy of ultracold atomic Fermi gases  

E-Print Network (OSTI)

This thesis presents experiments investigating the phase diagram of ultracold atomic Fermi gases using radio-frequency spectroscopy. The tunability of many experimental parameters including the temperature, the interparticle ...

Schirotzek, Andre

2010-01-01T23:59:59.000Z

79

Manhattan Project: J. Robert Oppenheimer, Enrico Fermi, and Ernest...  

Office of Scientific and Technical Information (OSTI)

J. Robert Oppenheimer, Enrico Fermi, and Ernest Lawrence Events > Dawn of the Atomic Era, 1945 > Debate Over How to Use the Bomb, Washington, D.C., Late Spring 1945 Events >...

80

Fermi-Dirac integrals in terms of Zeta Functions  

E-Print Network (OSTI)

This paper shows the Fermi-Dirac Integrals expressed in terms of Riemann and Hurwitz Zeta functions. This is done by defining an auxiliar function that permits rewrite the Fermi-Dirac integral in terms of simpler and known integrals resulting in the Zeta functions mentioned. The approach used here evades the use of iterative methods for the integrals and presents a generalization in a refereed interval, one that complements Sommerfeld lemma.

Michael Morales

2009-09-20T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Insulating Behavior of a Trapped Ideal Fermi Gas  

E-Print Network (OSTI)

We investigate theoretically and experimentally the center-of-mass motion of an ideal Fermi gas in a combined periodic and harmonic potential. We find a crossover from a conducting to an insulating regime as the Fermi energy moves from the first Bloch band into the bandgap of the lattice. The conducting regime is characterized by an oscillation of the cloud about the potential minimum, while in the insulating case the center of mass remains on one side of the potential.

L. Pezze'; L. Pitaevskii; A. Smerzi; S. Stringari; G. Modugno; E. DeMirandes; F. Ferlaino; H. Ott; G. Roati; M. Inguscio

2004-01-30T23:59:59.000Z

82

Fermi Large Area Telescope Operations: Progress Over 4 Years  

SciTech Connect

The Fermi Gamma-ray Space Telescope was launched into orbit in June 2008, and is conducting a multi-year gamma-ray all-sky survey, using the main instrument on Fermi, the Large Area Telescope (LAT). Fermi began its science mission in August 2008, and has now been operating for almost 4 years. The SLAC National Accelerator Laboratory hosts the LAT Instrument Science Operations Center (ISOC), which supports the operation of the LAT in conjunction with the Mission Operations Center (MOC) and the Fermi Science Support Center (FSSC), both at NASA's Goddard Space Flight Center. The LAT has a continuous output data rate of about 1.5 Mbits per second, and data from the LAT are stored on Fermi and transmitted to the ground through TDRS and the MOC to the ISOC about 10 times per day. Several hundred computers at SLAC are used to process LAT data to perform event reconstruction, and gamma-ray photon data are subsequently delivered to the FSSC for public release with a few hours of being detected by the LAT. We summarize the current status of the LAT, and the evolution of the data processing and monitoring performed by the ISOC during the first 4 years of the Fermi mission, together with future plans for further changes to detected event data processing and instrument operations and monitoring.

Cameron, Robert A.; /SLAC

2012-06-28T23:59:59.000Z

83

FermiNews - January 19, 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

January 19, 2001 | Number 1 January 19, 2001 | Number 1 In This Issue | FermiNews Main Page Protons Against Cancer by Kurt Riesselmann The Loma Linda Accelerator In contrast to biology and medicine, physics is not usually considered one of the life sciences. Yet basic research in physics makes critical, though often unsung, contributions to saving lives. Fermilab's role in cancer treatment is a case in point. Last month the Loma Linda Proton Treatment Center celebrated 10 years of treating cancer patients using particle beams from a compact proton accelerator completely designed and built at Fermilab. In the decade of the Center's operation, accelerator technology from Fermilab has provided cancer therapy at Loma Linda for more than 6000 patients from around the world. Cancer is the second leading cause of death in the United States, exceeded only by heart disease. Nearly five million lives have been lost to cancer since 1990, and physicians have diagnosed almost three times as many people with cancer during the same period of time. With people living longer than ever before, their chance of developing cancer is at an all-time high.

84

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

December 14, 2001 December 14, 2001 Number 20 f I N S I D E : 6 T h e F u t u r e , F i r s t D r a f t 8 Vi e w f r o m t h e To p 1 2 J u s t t h e R i g h t Ty p e Photo by Fred Ullrich What Do The Neighbors Think? 2 "Hello, I'm calling from Northern Illinois University. We are doing a study with people who live in northern Illinois about their opinions of science and the Fermi National Accelerator Laboratory (or Fermilab) located in Batavia. We are not selling anything. My questions will only take a very few minutes and there are no right or wrong answers. We are only interested in people's opinions." Early last spring, 1,033 of Fermilab's neighbors (about 45 percent of those who picked up the phone) responded to the invitation to tell what they thought about science, about Fermilab and about Fermilab's future. The laboratory's

85

The Nuclear Thomas-Fermi Model  

DOE R&D Accomplishments (OSTI)

The statistical Thomas-Fermi model is applied to a comprehensive survey of macroscopic nuclear properties. The model uses a Seyler-Blanchard effective nucleon-nucleon interaction, generalized by the addition of one momentum-dependent and one density-dependent term. The adjustable parameters of the interaction were fitted to shell-corrected masses of 1654 nuclei, to the diffuseness of the nuclear surface and to the measured depths of the optical model potential. With these parameters nuclear sizes are well reproduced, and only relatively minor deviations between measured and calculated fission barriers of 36 nuclei are found. The model determines the principal bulk and surface properties of nuclear matter and provides estimates for the more subtle, Droplet Model, properties. The predicted energy vs density relation for neutron matter is in striking correspondence with the 1981 theoretical estimate of Friedman and Pandharipande. Other extreme situations to which the model is applied are a study of Sn isotopes from {sup 82}Sn to {sup 170}Sn, and the rupture into a bubble configuration of a nucleus (constrained to spherical symmetry) which takes place when Z{sup 2}/A exceeds about 100.

Myers, W. D.; Swiatecki, W. J.

1994-08-01T23:59:59.000Z

86

Labs at-a-Glance: Fermi National Accelerator Laboratory | U.S. DOE Office  

Office of Science (SC) Website

Fermi National Fermi National Accelerator Laboratory Laboratories Ames Laboratory Argonne National Laboratory Brookhaven National Laboratory Fermi National Accelerator Laboratory Lawrence Berkeley National Laboratory Oak Ridge National Laboratory Pacific Northwest National Laboratory Princeton Plasma Physics Laboratory SLAC National Accelerator Laboratory Thomas Jefferson National Accelerator Facility Laboratory Policy and Evaluation Safety, Security and Infrastructure Laboratory Science Highlights Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 Labs at-a-Glance: Fermi National Accelerator Laboratory Print Text Size: A A A RSS Feeds FeedbackShare Page Fermi National Accelerator Laboratory Logo Visit the Fermi National Accelerator

87

Onset of a Pseudogap Regime in Ultracold Fermi Gases  

Science Conference Proceedings (OSTI)

We show, using an ab initio approach based on Quantum Monte Carlo technique, that the pseudogap regime emerges in ultracold Fermi gases close to the unitary point. We locate the onset of this regime at a value of the interaction strength corresponding to (k{sub F}a){sup -1}{approx_equal}-0.05 (a--scattering length). We determine the evolution of the gap as a function of temperature and interaction strength in the Fermi gas around the unitary limit and show that our results exhibit a remarkable agreement with the recent wave-vector resolved radio frequency spectroscopy data. Our results indicate that a finite temperature structure of the Fermi gas around unitarity is more complicated and involves the presence of the phase with preformed Cooper pairs, which, however, do not contribute to the long range order.

Magierski, Piotr [Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw (Poland); Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States); Wlazlowski, Gabriel [Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw (Poland); Bulgac, Aurel [Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)

2011-09-30T23:59:59.000Z

88

Fermi-LAT Observation of Quiescent Solar Emission  

E-Print Network (OSTI)

The Large Area Telescope (LAT), one of two instruments on the Fermi Gamma-ray Space Telescope is a pair-conversion detector designed to study the gamma-ray sky in the energy range 30 MeV to 300 GeV. Fermi has detected high-energy gamma rays from the quiet Sun produced by interactions of cosmic-ray nucleons with the solar surface, and cosmic-ray electrons with solar photons in the heliosphere. While the Sun was detected by EGRET on CGRO with low statistics, Fermi provides high-quality detections on a daily basis allowing variability to be addressed. Such observations will provide a probe of the extreme conditions near the solar surface and a monitor the modulation of cosmic rays over the inner heliosphere. We discuss the study of the quiescent solar emission including spectral analysis of its two components, disk and inverse Compton.

Orlando, Elena

2009-01-01T23:59:59.000Z

89

Fermi-LAT Observation of Quiet Solar Emission  

E-Print Network (OSTI)

The Large Area Telescope (LAT) on board Fermi has detected high-energy gamma rays from the quiet Sun produced by interactions of cosmic-ray nucleons with the solar surface and cosmic-ray electrons with solar photons in the heliosphere. Such observations provide a probe of the extreme conditions near the solar atmosphere and photosphere and permit the study of the modulation of cosmic rays over the inner heliosphere. For the first year of Fermi observations the solar modulation was at its minimum corresponding to a maximum cosmic-ray flux and, hence, maximum gamma-ray emission from the Sun. We discuss the study of the quiescent solar emission, including spectral analysis of its two components, disk and inverse Compton, using the first-year data of the mission and models using the electron spectrum measured by Fermi.

Orlando, Elena

2009-01-01T23:59:59.000Z

90

FERMI@Elettra FEL Design Technical Optimization Final Report  

Science Conference Proceedings (OSTI)

This is the final report of the FEL Design Group for the Technical Optimization Study for the FERMI{at}ELETTRA project. The FERMI{at}ELETTRA project is based on the principle of harmonic upshifting of an initial ''seed'' signal in a single pass, FEL amplifier employing multiple undulators. There are a number of FEL physics principles which underlie this approach to obtaining short wavelength output: (1) the energy modulation of the electron beam via the resonant interaction with an external laser seed (2) the use of a chromatic dispersive section to then develop a strong density modulation with large harmonic overtones (3) the production of coherent radiation by the microbunched beam in a downstream radiator. Within the context of the FERMI project, we discuss each of these elements in turn.

Fawley, William; Penn, Gregory; Allaria, Enrico; De Ninno,Giovanni; Graves, William

2006-07-31T23:59:59.000Z

91

Striped instability of a holographic Fermi-like liquid  

E-Print Network (OSTI)

We consider a holographic description of a system of strongly-coupled fermions in 2+1 dimensions based on a D7-brane probe in the background of D3-branes. The black hole embedding represents a Fermi-like liquid. We study the excitations of the Fermi liquid system. Above a critical density which depends on the temperature, the system becomes unstable towards an inhomogeneous modulated phase which is similar to a charge density and spin wave state. The essence of this instability can be effectively described by a Maxwell-axion theory with a background electric field. We also consider the fate of zero sound at non-zero temperature.

Oren Bergman; Niko Jokela; Gilad Lifschytz; Matthew Lippert

2011-06-20T23:59:59.000Z

92

Fermi velocity renormalization and dynamical gap generation in graphene  

E-Print Network (OSTI)

We study the renormalization of the Fermi velocity by the long-range Coulomb interactions between the charge carriers in the Dirac-cone approximation for the effective low-energy description of the electronic excitations in graphene at half filling. Solving the coupled system of Dyson-Schwinger equations for the dressing functions in the corresponding fermion propagator with various approximations for the particle-hole polarization we observe that Fermi velocity renormalization effects generally lead to a considerable increase of the critical coupling for dynamical gap generation and charge-density wave formation at the semimetal-insulator transition.

C. Popovici; C. S. Fischer; L. von Smekal

2013-08-28T23:59:59.000Z

93

Computational Approach in Determination of {sup 233}U and {sup 233}Th Fermi Energy  

SciTech Connect

There are several methods to get Fermi energy such as hermit polynomial expansion and Wigner-Kirkwood expansion, these are analytical method. In this paper will be discussed numerical approach of calculating Fermi energy of {sup 233}Th and {sup 233}U nuclei. Our work demonstrates the simple technique of determining Fermi energy.

Kurniadi, R.; Perkasa, Y. S.; Waris, A. [Nuclear Physics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung (Indonesia)

2010-12-23T23:59:59.000Z

94

Ecological Optimization Performance of An Irreversible Quantum Otto Cycle Working with an Ideal Fermi Gas  

Science Conference Proceedings (OSTI)

The model of an irreversible Otto cycle using an ideal Fermi gas as the working fluid, which is called as the irreversible Fermi Otto cycle, is established in this paper. Based on the equation of state of an ideal Fermi gas, the ecological optimization ...

Feng Wu; Lingen Chen; Fengrui Sun; Chih Wu; Fangzhong Guo; Qing Li

2006-03-01T23:59:59.000Z

95

Energy Cost to Make a Hole in the Fermi Sea  

E-Print Network (OSTI)

The change in energy of an ideal Fermi gas when a local one-body potential is inserted into the system, or when the density is changed locally, are important quantities in condensed matter physics. We show that they can be rigorously bounded from below by a universal constant times the value given by the semiclassical approximation.

Rupert L. Frank; Mathieu Lewin; Elliott H. Lieb; Robert Seiringer

2011-02-07T23:59:59.000Z

96

Bold diagrammatic Monte Carlo for the resonant Fermi gas  

E-Print Network (OSTI)

We provide a comprehensive description of the Bold Diagrammatic Monte Carlo algorithm for the normal resonant Fermi gas that was briefly reported and used in [Nature Phys. 8, 366 (2012)] and [arXiv:1303.6245]. Details are given on all key aspects of the scheme: diagrammatic framework, Monte Carlo moves, ultraviolet asymptotics, and resummation techniques.

Van Houcke, K; Prokof'ev, N; Svistunov, B

2013-01-01T23:59:59.000Z

97

Weibel instabilities in a completely degenerate electron Fermi gas  

SciTech Connect

Weibel instability in a degenerate Fermi plasma is studied. A new type of quantum Weibel instabilities is disclosed. In particular, a novel oscillatory Weibel instability is found and its growth rate is obtained. A transverse zero sound in a quantum degenerate electron gas, which has no counterpart in the classical consideration, is revealed.

Tsintsadze, Levan N. [Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)

2009-09-15T23:59:59.000Z

98

General Transformation Formulas for Fermi-Walker Coordinates  

E-Print Network (OSTI)

We calculate the transformation and inverse transformation, in the form of Taylor expansions, from arbitrary coordinates to Fermi-Walker coordinates in tubular neighborhoods of arbitrary timelike paths for general spacetimes. Explicit formulas for coefficients and the Jacobian matrix are given.

David Klein; Peter Collas

2007-12-22T23:59:59.000Z

99

Energy Department Receives Prestigious Closing the Circle Awards...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

on Award-Winning Curriculum Secretary Chu Names 2009 Enrico Fermi Award Winners Top: MOX Services President Kelly Trice, left, presents a certificate to Wise President and...

100

The Centennial Celebrations of the Birth of the Physicist Enrico Fermi  

Office of Scientific and Technical Information (OSTI)

Centennial Celebrations of the Birth of the Physicist Enrico Fermi Centennial Celebrations of the Birth of the Physicist Enrico Fermi The Department of Energy's Fermi National Laboratory, the University of Chicago, and the University of Pisa in Italy will celebrate Enrico Fermi's 100th birthday on September 28 and 29 with symposiums on the universality of his physics and birthday cake. Enrico Fermi Enrico Fermi September 24-"The Italian navigator has landed" was the wartime-coded message announcing the successful first operation of a nuclear reactor on December 2, 1942. The expression refers to Columbus's exploration of continents previously unknown to Europeans, but also could apply to the exploration of another unknown continent, the atomic nucleus. The "Italian navigator" in this case was Enrico Fermi-the man who achieved the first

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Fermi Site Office Homepage | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Home Home Fermi Site Office (FSO) FSO Home About Current Projects Contract Management Environment, Safety and Health (ES&H) Resources Contact Information Fermi Site Office U.S. Department of Energy MS 118 P.O. Box 2000 Kirk Road and Pine Street Batavia, IL 60510 P: (630) 840-3281 F: (630) 840-3285 Fermi Site Office Pictured Right: Fermi view to the Northeast Fermi View to Northeast 1 of 2 Print Text Size: A A A RSS Feeds FeedbackShare Page The Fermi Site Office (FSO) is an organization within the U.S. Department of Energy's Office of Science with responsibility to oversee and manage the Management and Operating (M&O) contract for the Fermi National Accelerator Laboratory (FNAL) in Batavia, Illinois. FNAL is one of ten Office of Science Laboratories and is a single-program

102

Fermi facts, fables: Colleagues and friends share memories  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermi facts, fables: Colleagues and friends Fermi facts, fables: Colleagues and friends share memories About Director's Welcome Organization Achievements Highlights Fact Sheets, Brochures & Other Documents Multimedia Library Visit Argonne Work with Argonne Contact us Nuclear Energy Why Nuclear Energy? Why are some people afraid of Nuclear Energy? How do nuclear reactors work? Cheaper & Safer Nuclear Energy Helping to Solve the Nuclear Waste Problem Nuclear Reactors Nuclear Reactors Early Exploration Training Reactors Basic and Applied Science Research LWR Technology Development BORAX-III lighting Arco, Idaho (Press Release) Heavy Water and Graphite Reactors Fast Reactor Technology Integral Fast Reactor Argonne Reactor Tree CP-1 70th Anniversary CP-1 70th Anniversary Argonne's Nuclear Science and Technology Legacy

103

Plasma dispersion function for a Fermi-Dirac distribution  

SciTech Connect

A plasma dispersion function (PDF) is defined for a nonrelativistic Fermi-Dirac distribution and its properties are explored. The degree of degeneracy is described by a parameter {xi}=e{sup {mu}}{sub e}{sup /T}{sub e}, for electrons, with {mu}{sub e}/T{sub e} large and negative in the nondegenerate limit, and large and positive in the completely degenerate limit. The PDF is denoted Z(y,{xi}), where the variable y={omega}/{radical}(2)kV{sub e}, is the argument of the conventional PDF, Z(y)=Z(y,0), for a Maxwellian distribution. In the completely degenerate limit, Z(y,{xi}) approaches a logarithmic function that depends on the Fermi temperature and is independent of T{sub e}. Analytic approximations to Z(y,{xi}) are derived in terms of polylogarithmic functions for y{sup 2}>>1 and for y{sup 2}<<1.

Melrose, D. B. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Mushtaq, A. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Theoretical Plasma Physics Division, PINSTECH, Nilore, 44000 Islamabad (Pakistan)

2010-12-15T23:59:59.000Z

104

Heat capacity of a two-component superfluid Fermi gas  

E-Print Network (OSTI)

We investigate mean-field effects in two- component trapped Fermi gases in the superfluid phase, in the vicinity of s-wave Feshbach resonances. Within the resonance superfluidity approach (Holland et al., 2001) we calculate the ground state energy and the heat capacity as function of temperature. Heat capacity is analyzed for different trap aspect ratios. We find that trap anisotropy is an important factor in determining both the value of heat capacity near the transition temperature and the transition temperature itself.

Alexander V. Avdeenkov

2003-09-25T23:59:59.000Z

105

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

24, 2001 24, 2001 Number 14 f I N S I D E : 2 F e r m i l a b R e c e i v e s $1. 2 8 M i l l i o n i n D O E S c i D A C Aw a r d s 6 K e s i c h F i n d s t h e Vi r t u e i n t h e Wa t e r 1 2 A u d i t o r i u m C o m m i t t e e M a k e s S u r e t h e S h o w G o e s O n 1 4 F e r m i l a b A r t S e r i e s 2 0 0 1 - 2 0 0 2 S e a s o n Câu tre Bamboo Bridge 8 ` by Mike Perricone Fermilab physicists and computer scientists can stake a larger claim to the future of high-energy physics-and to the next generation of computing- thanks to their part in the first-ever awards in DOE's Scientific Discovery through Advanced Computing Program (SciDAC), announced August 14 in Washington, D.C. by Secretary of Energy Spencer Abraham. Through the SciDAC awards, Fermilab will receive approximately $1.28 million a year for the next three years as a participant in three nationwide collaborations: the Particle Physics Data Grid (PPDG); Advanced Computing

106

Transverse spin diffusion in strongly interacting Fermi gases  

E-Print Network (OSTI)

We compute spin diffusion in a dilute Fermi gas at arbitrary temperature, polarization and strong interaction in the normal phase using kinetic theory. While the longitudinal spin diffusivity depends weakly on polarization and diverges for small temperatures, the transverse spin diffusivity D_\\perp has a strong polarization dependence and approaches a finite value for T->0 in the Fermi liquid phase. For a 3D unitary Fermi gas at infinite scattering length the diffusivities reach a minimum near the quantum limit of diffusion \\hbar/m in the quantum degenerate regime and are strongly suppressed by medium scattering, and we discuss the importance of the spin-rotation effect. In two dimensions, D_\\perp attains a minimum at strong coupling -1 < ln(kFa2D) < 1 and reaches D_\\perp~0.2...0.3\\hbar/m at large polarization. These values are consistent with recent measurements of two-dimensional ultracold atomic gases in the strong coupling regime.

Tilman Enss

2013-07-19T23:59:59.000Z

107

Fermi velocity renormalization and the excitonic insulator in graphene  

E-Print Network (OSTI)

We compute the Fermi velocity of the Dirac quasiparticles in clean graphene at the charge neutrality point for strong Coulomb coupling alpha_g. We perform a Lattice Monte Carlo calculation within the low-energy Dirac theory, which includes an instantaneous, long-range Coulomb interaction. This method is non-perturbative and takes full account of quantum fluctuations. We find a finite renormalized Fermi velocity v_FR > v_F, where v_F = c/300. We introduce the critical Fermi velocity renormalization v_c = v_FR(alpha_gc)/v_F, where alpha_gc is the critical coupling for the semimetal-insulator transition due to excitonic pair formation. We compare our results with empirical studies of interaction-induced spectral changes in graphene. We find v_c = 3.3, which should be contrasted with v_FR/v_F = 2 - 3 for ultra-clean suspended graphene and v_FR/v_F = 1.2 for graphene on a boron nitride substrate. Our results are consistent with the non-observation of insulating states in suspended graphene in the absence of an external magnetic field. We also discuss the dynamical critical exponent z.

Joaquín E. Drut; Timo A. Lähde

2013-04-05T23:59:59.000Z

108

14 Fermi 6/29/01  

NLE Websites -- All DOE Office Websites (Extended Search)

29, 2001 29, 2001 Number 11 f Photo by Jenny Mullins I N S I D E : 2 H E PA P S u b p a n e l C o m e s t o F e r m i l a b 6 U s e r s ' M e e t i n g a F o r u m o n t h e F u t u r e 8 C M S : C h a s i n g S u p e r s y m m e t r y Putting Memory to Work 12 by Judy Jackson It was a busy week at Fermilab. High-energy protons collided with antiprotons as Run II at the Tevatron at last began to gain steam. Fermilab physicists gathered on June 11 and 12 for their annual Users' Meeting at the laboratory. Graduate students vied for the Best Poster award in a traditional annual contest. The Italians threw a party in the Village Barn, with cannoli for all. And there in the midst of it was the future of particle physics in the United States-or at least the panel of physicists charged with defining it. The DOE/NSF High-Energy Physics Advisory Panel Subpanel on Long-

109

Fermi transport of spinors and free QED states in curved spacetime  

E-Print Network (OSTI)

Fermi transport of spinors can be precisely understood in terms of 2-spinor geometry. By using a partly original, previously developed treatment of 2-spinors and classical fields, we describe the family of all transports, along a given 1-dimensional timelike submanifold of spacetime, which yield the standard Fermi transport of vectors. Moreover we show that this family has a distinguished member, whose relation to the Fermi transport of vectors is similar to the relation between the spinor connection and spacetime connection. Various properties of the Fermi transport of spinors are discussed, and applied to the construction of free electron states for a detector-dependent QED formalism introduced in a previous paper.

Daniel Canarutto

2008-12-03T23:59:59.000Z

110

Quantum phase transition in Bose-Fermi mixtures  

SciTech Connect

We study a quantum Bose-Fermi mixture near a broad Feshbach resonance at zero temperature. Within a quantum field theoretical model, a two-step Gaussian approximation allows us to capture the main features of the quantum phase diagram. We show that a repulsive boson-boson interaction is necessary for thermodynamic stability. The quantum phase diagram is mapped in chemical-potential and density space, and both first- and second-order quantum phase transitions are found. We discuss typical characteristics of the first-order transition, such as hysteresis or a droplet formation of the condensate, which may be searched for experimentally.

Ludwig, D.; Moroz, S.; Wetterich, C. [Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, D-69120 Heidelberg (Germany); Floerchinger, S. [Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, D-69120 Heidelberg (Germany); Physics Department, Theory Unit, CERN, CH-1211 Geneve 23 (Switzerland)

2011-09-15T23:59:59.000Z

111

Observation of a Two-Dimensional Fermi Gas of Atoms  

Science Conference Proceedings (OSTI)

We have prepared a degenerate gas of fermionic atoms which move in two dimensions while the motion in the third dimension is 'frozen' by tight confinement and low temperature. In situ imaging provides direct measurement of the density profile and temperature. The gas is confined in a defect-free optical potential, and the interactions are widely tunable by means of a Fano-Feshbach resonance. This system can be a starting point for exploration of 2D Fermi physics and critical phenomena in a pure, controllable environment.

Martiyanov, Kirill; Makhalov, Vasiliy; Turlapov, Andrey [Institute of Applied Physics, Russian Academy of Sciences, ul. Ulyanova 46, Nizhniy Novgorod, 603000 (Russian Federation)

2010-07-16T23:59:59.000Z

112

Coherent state of a weakly interacting ultracold Fermi gas  

E-Print Network (OSTI)

We examine the weakly interacting atoms in an ultracold Fermi gas leading to a state of macroscopic coherence, from a theoretical perspective. It has been shown that this state can be described as a fermionic coherent state. These coherent states are the eigenstates of fermionic annihilation operators, the eigenvalues being anti-commuting numbers or Grassmann numbers. By exploiting the simple rules of Grassmann algebra and a close kinship between relations evaluated for more familiar bosonic fields and those for fermionic fields, we derive the thermodynamic limit, the spontaneous symmetry breaking and the quasi-particle spectrum of the fermionic system.

Arnab Ghosh; Sudarson Sekhar Sinha; Deb Shankar Ray

2013-01-17T23:59:59.000Z

113

Stability of spinor Fermi gases in tight waveguides  

Science Conference Proceedings (OSTI)

The two- and three-body correlation functions of the ground state of an optically trapped ultracold spin-(1/2) Fermi gas (SFG) in a tight waveguide [one-dimensional (1D) regime] are calculated in the plane of even- and odd-wave coupling constants, assuming a 1D attractive zero-range odd-wave interaction induced by a 3D p-wave Feshbach resonance, as well as the usual repulsive zero-range even-wave interaction stemming from 3D s-wave scattering. The calculations are based on the exact mapping from the SFG to a 'Lieb-Liniger-Heisenberg' model with delta-function repulsions depending on isotropic Heisenberg spin-spin interactions, and indicate that the SFG should be stable against three-body recombination in a large region of the coupling constant plane encompassing parts of both the ferromagnetic and antiferromagnetic phases. However, the limiting case of the fermionic Tonks-Girardeau gas, a spin-aligned 1D Fermi gas with infinitely attractive p-wave interactions, is unstable in this sense. Effects due to the dipolar interaction and a Zeeman term due to a resonance-generating magnetic field do not lead to shrinkage of the region of stability of the SFG.

Campo, A. del; Muga, J. G. [Departamento de Quimica-Fisica, Universidad del Pais Vasco, Apartado 644, 48080 Bilbao (Spain); Girardeau, M. D. [College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)

2007-07-15T23:59:59.000Z

114

Simulating strongly correlated electrons with a strongly interacting Fermi gas  

SciTech Connect

The quantum many-body physics of strongly-correlated fermions is studied in a degenerate, strongly- interacting atomic Fermi gas, first realized by our group with DOE support in 2002. This system, which exhibits strong spin pairing, is now widely studied and provides an important paradigm for testing predictions based on state-of-the-art many-body theory in fields ranging from nuclear matter to high temperature superfluidity and superconductivity. As the system is strongly interacting, both the superfluid and the normal fluid are nontrivial and of great interest. A central part of our program on Fermi gases is the connection between the study of thermodynamics, supported by DOE and the study of hydrodynamic transport, supported by NSF. This connection is especially interesting in view of a recent conjecture from the string theory community on the concept of nearly perfect normal fluids, which exhibit a minimum ratio of shear viscosity to entropy density in strongly-interacting, scale-invariant systems.

Thomas, John E. [North Carolina State University

2013-05-28T23:59:59.000Z

115

Kolmogorov Complexity, String Information, Panspermia and the Fermi Paradox  

E-Print Network (OSTI)

Bit strings rather than byte files can be a mode of transmission both for intelligent signals and for travels of extraterrestrial life. Kolmogorov complexity, i.e. the minimal length of a binary coded string completely defining a system, can then, due to its universality, become a key concept in the strategy of the search of extraterrestrials. Evaluating, for illustration, the Kolmogorov complexity of the human genome, one comes to an unexpected conclusion that a low complexity compressed string - analog of Noah's ark - will enable the recovery of the totality of terrestrial life. The recognition of bit strings of various complexity up to incompressible Martin-L\\"{o}f random sequences, will require a different strategy for the analysis of the cosmic signals. The Fermi paradox "Where is Everybody?" can be viewed under in the light of such information panspermia, i.e. a Universe full of traveling life streams.

V. G. Gurzadyan

2005-08-01T23:59:59.000Z

116

Feynman diagrams versus Fermi-gas Feynman emulator  

E-Print Network (OSTI)

Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is usually plagued by the intricate quantum statistics at play. Here we present a cross-validation between a new theoretical approach, Bold Diagrammatic Monte Carlo (BDMC), and precision experiments on ultra-cold atoms. Specifically, we compute and measure with unprecedented accuracy the normal-state equation of state of the unitary gas, a prototypical example of a strongly correlated fermionic system. Excellent agreement demonstrates that a series of Feynman diagrams can be controllably resummed in a non-perturbative regime using BDMC. This opens the door to the solution of some of the most challenging problems across many areas of physics.

K. Van Houcke; F. Werner; E. Kozik; N. Prokofev; B. Svistunov; M. J. H. Ku; A. T. Sommer; L. W. Cheuk; A. Schirotzek; M. W. Zwierlein

2011-10-17T23:59:59.000Z

117

Pair correlations of an expanding superfluid Fermi gas  

E-Print Network (OSTI)

The pair correlation function of an expanding gas is investigated with an emphasis on the BEC-BCS crossover of a superfluid Fermi gas at zero temperature. At unitarity quantum Monte Carlo simulations reveal the occurrence of a sizable bunching effect due to interactions in the spin up-down channel which, at short distances, is larger than that exhibited by thermal bosons in the Hanbury-Brown and Twiss effect. We propose a local equilibrium ansatz for the pair correlation function which we predict will remain isotropic during the expansion even if the trapping potential is anisotropic, contrary to what happens for non-interacting gases. This behavior is understood to be a consequence of the violation of scaling of the pair correlation function due to interactions.

C. Lobo; I. Carusotto; S. Giorgini; A. Recati; S. Stringari

2006-04-11T23:59:59.000Z

118

Environmental Survey preliminary report, Fermi National Accelerator Laboratory, Batavia, Illinois  

SciTech Connect

This report presents the preliminary findings from the first phase of the Environmental Survey of the US Department of Energy (DOE) Fermi National Accelerator Laboratory (Fermilab), conducted September 14 through 25, 1987. The Survey is being conducted by an interdisciplinary team of environmental specialists led and managed by the Office of Environment, Safety and Health's Office of Environmental Audit. Individual participants for the Survey team are being supplied by a private contractor. The objective of the Survey is to identify environmental problems and areas of environmental risk associated with Fermilab. The Survey covers all environmental media and all areas of environmental regulation. It is being performed in accordance with the DOE Environmental Survey Manual. This phase of the Survey involves the review of existing site environmental data, observations of the operations performed at Fermilab, and interviews with site personnel. 110 refs., 26 figs., 41 tabs.

Not Available

1988-10-01T23:59:59.000Z

119

Fermi-LAT and the Gamma-Ray Line Search  

E-Print Network (OSTI)

A distinct signature for dark matter in the form of weakly interacting massive particles (WIMPs) would be the detection of a monochromatic spectral line in the gamma-ray sky. The Fermi-LAT collaboration has searched for such a line in the energy range from 5 to 300 GeV in five sky regions around the Galactic centre. No globally significant line is detected, and 95% CL upper limits on monochromatic-line strengths are presented. The smallest search region reveals a line-like structure at 133 GeV with a local significance of 2.9 sigma after 4.4 years of data, which translates to less than 1 sigma global significance from a trial factor of around 200.

Gustafsson, Michael

2013-01-01T23:59:59.000Z

120

FERMI LARGE AREA TELESCOPE OBSERVATIONS OF GRB 110625A  

SciTech Connect

Gamma-ray bursts (GRBs) that emit photons at GeV energies form a small but significant population of GRBs. However, the number of GRBs whose GeV-emitting period is simultaneously observed in X-rays remains small. We report {gamma}-ray observations of GRB 110625A using Fermi's Large Area Telescope in the energy range 100 MeV-20 GeV. Gamma-ray emission at these energies was clearly detected using data taken between 180 s and 580 s after the burst, an epoch after the prompt emission phase. The GeV light curve differs from a simple power-law decay, and probably consists of two emission periods. Simultaneous Swift X-Ray Telescope observations did not show flaring behaviors as in the case of GRB 100728A. We discuss the possibility that the GeV emission is the synchrotron self-Compton radiation of underlying ultraviolet flares.

Tam, P. H. T.; Kong, A. K. H. [Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Fan Yizhong, E-mail: phtam@phys.nthu.edu.tw [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)

2012-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Fermi GBM Observations of Terrestrial Gamma-ray Flashes  

Science Conference Proceedings (OSTI)

Terrestrial Gamma-ray Flashes are short pulses of energetic radiation associated with thunderstorms and lightning. While the Gamma-ray Burst Monitor (GBM) on Fermi was designed to observe gamma-ray bursts, its large BGO detectors are excellent for observing TGFs. Using GBM, TGF pulses are seen to either be symmetrical or have faster rise time than fall times. Some TGFs are resolved into double, partially overlapping pulses. Using ground-based radio observations of lightning from the World Wide Lightning Location Network (WWLLN), TGFs and their associated lightning are found to be simultaneous to {approx_equal}40 {mu} s. The lightning locations are typically within 300 km of the sub-spacecraft point.

Briggs, Michael S. [CSPAR, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805 (United States)

2011-09-21T23:59:59.000Z

122

Two-dimensional Fermi liquid with fixed chemical potential  

Science Conference Proceedings (OSTI)

de Haas-van Alphen measurements made on the organic metal {beta}{sup ''}-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} reveal the existence of an ideal two-dimensional (2D) Fermi surface, but rather than having the conventional sawtooth wave form that is normally observed in all other 2D electron gases, instead, an ''inverse sawtooth'' wave form is observed, which is to be expected when the chemical potential is pinned at a constant value. While this proves the existence of the theoretically predicted quasi-one-dimensional band, it further implies that this band has an exceptionally large density of states. (c) 2000 The American Physical Society.

Wosnitza, J. [Physikalisches Institut, Universitaet Karlsruhe, 76128 Karlsruhe, (Germany); Wanka, S. [Physikalisches Institut, Universitaet Karlsruhe, 76128 Karlsruhe, (Germany); Hagel, J. [Physikalisches Institut, Universitaet Karlsruhe, 76128 Karlsruhe, (Germany); Balthes, E. [Grenoble High Magnetic Field Laboratory, MPI and C.N.R.S., 38042 Grenoble, (France); Harrison, N. [National High Magnetic Field Laboratory, LANL Los Alamos, New Mexico 87545 (United States); Schlueter, J. A.; Kini, A.M.; Geiser, U. [Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, Ilinois 60439 (United States); Mohtasham, J.; Winter, R. W. [Department of Chemistry, Portland State University, Portland, Oregon 97207 (United States)] (and others)

2000-03-15T23:59:59.000Z

123

Universal four-component Fermi gas in one dimension  

SciTech Connect

A four-component Fermi gas in one dimension with a short-range four-body interaction is shown to exhibit a one-dimensional analog of the BCS-BEC crossover. Its low-energy physics is governed by a Tomonaga-Luttinger liquid with three spin gaps. The spin gaps are exponentially small in the weak coupling (BCS) limit where they arise from the charge-density-wave instability, and become large in the strong coupling (BEC) limit because of the formation of tightly bound tetramers. We investigate the ground-state energy, the sound velocity, and the gap spectrum in the BCS-BEC crossover and discuss exact relationships valid in our system. We also show that a one-dimensional analog of the Efimov effect occurs for five bosons while it is absent for fermions. Our work opens up a very rich field of universal few-body and many-body physics in one dimension.

Nishida, Yusuke [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Son, Dam T. [Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550 (United States)

2010-10-15T23:59:59.000Z

124

Gamma-Rays from Radio Galaxies: Fermi-Lat Observations  

E-Print Network (OSTI)

We review the high energy properties of Misaligned AGNs associated with gamma-ray sources detected by Fermi in 24 months of survey. Most of them are nearby emission low power radio galaxies (i.e FRIs) which probably have structured jets. On the contrary, high power radio sources (i.e FRIIs) with GeV emission are rare. The small number of FRIIs does not seem to be related to their higher redshifts. Assuming proportionality between the radio core flux and the gamma-ray flux, several of them are expected to be bright enough to be detected above 100 MeV in spite of their distance. We suggest that beaming/jet structural differences are responsible for the detection rate discrepancy observed between FRIs and FRIIs.

Grandi, Paola

2011-01-01T23:59:59.000Z

125

The Fermi Bubbles as Starburst Wind Termination Shocks  

E-Print Network (OSTI)

The enhanced star formation in the inner 100 pc of the Galaxy launches a superwind, reaching ~1600 km/s for M82-like parameters. The ram pressure of the wind is very low compared to more powerful starburst winds. I show that halo gas stops the wind a few kpc from the Galactic Center. I argue that the termination shock accelerates cosmic rays, and that the resulting Inverse Compton gamma-rays are visible as the Fermi Bubbles. The Bubbles are thus wind bubbles, which the starburst can inflate within 10 Myr. They remain in steady state as long as the starburst lasts. The shock may accelerate PeV electrons and ultra-high energy protons. The Bubbles may be analogs of galactic wind termination shocks in the intergalactic medium. I discuss the advantages and problems of this model.

Lacki, Brian C

2013-01-01T23:59:59.000Z

126

Award Laureates | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Award Laureates Award Laureates The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates 2010's 2000's 1990's 1980's 1970's 1960's 1950's Ceremony The Life of Enrico Fermi Contact Information The Enrico Fermi Award U.S. Department of Energy SC-2/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-9395 E: fermi.award@science.doe.gov Award Laureates Print Text Size: A A A RSS Feeds FeedbackShare Page 2010's Laureates 2000's Laureates 1990's Laureates 2010 Mildred S. Dresselhaus Burton Richter 2000 Sheldon Datz Sidney D. Drell Herbert F. York 2003 John N. Bahcall Raymond Davis, Jr. Seymour Sack 2005 Arthur H. Rosenfeld 2009 John Bannister Goodenough Siegfried S. Hecker 1990 George A. Cowan Robley D. Evans 1992 Harold Brown John S. Foster, Jr.

127

Search for Spatially Extended Fermi-LAT Sources Using Two Years of Data  

SciTech Connect

Spatial extension is an important characteristic for correctly associating {gamma}-ray-emitting sources with their counterparts at other wavelengths and for obtaining an unbiased model of their spectra. We present a new method for quantifying the spatial extension of sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi). We perform a series of Monte Carlo simulations to validate this tool and calculate the LAT threshold for detecting the spatial extension of sources. We then test all sources in the second Fermi -LAT catalog (2FGL) for extension. We report the detection of seven new spatially extended sources.

Lande, Joshua; Ackermann, Markus; Allafort, Alice; Ballet, Jean; Bechtol, Keith; Burnett, Toby; Cohen-Tanugi, Johann; Drlica-Wagner, Alex; Funk, Stefan; Giordano, Francesco; Grondin, Marie-Helene; Kerr, Matthew; Lemoine-Goumard, Marianne

2012-07-13T23:59:59.000Z

128

Coordinate-Space Hartree-Fock-Bogoliubov Solvers for Super fluid Fermi  

NLE Websites -- All DOE Office Websites (Extended Search)

Coordinate-Space Hartree-Fock-Bogoliubov Solvers for Super fluid Fermi Coordinate-Space Hartree-Fock-Bogoliubov Solvers for Super fluid Fermi Systems in Large Boxes Submitted by mkaczmar on March 29, 2013 - 12:53 Authors: Pei, J.C., Fann, G.I., Harrison, R.J., Nazarewicz, W., Hill, J., Galindo, D., Jia, J. The self-consistent Hartree-Fock-Bogoliubov problem in large boxes can be solved accurately in the coordinate space with the recently developed solvers HFB-AX (2D) and MADNESS-HFB (3D). This is essential for the description of superfluid Fermi systems with complicated topologies and significant spatial extend, such as fissioning nuclei, weakly-bound nuclei, nuclear matter in the neutron star rust, and ultracold Fermi atoms in elongated traps. The HFB-AX solver based on B-spline techniques uses a hybrid MPI and OpenMP programming model for parallel computation for

129

Atoms with nuclei of finite extension at finite temperature: A Thomas-Fermi approximation  

Science Conference Proceedings (OSTI)

Atoms at finite temperature and with a nucleus of finite extension are analyzed by a modification of the Thomas-Fermi model for {ital T}{ne}0. Applications to strange-matter atoms are included.

Epele, L.N.; Fanchiotti, H.; Garcriaaa Canal, C.A.; Guillen, J.C. (Laboratorio de Fisica Teorica, Departamento de Fisica, Universidad Nacional de La Plata, Casilla de Correo 67, 1900 La Plata (Argentina))

1990-08-01T23:59:59.000Z

130

Fermi Surfaces in General Codimension and a New Controlled Nontrivial Fixed Point  

E-Print Network (OSTI)

The energy of a d-dimensional Fermi system typically varies only along d[subscript c]=1 (“radial”) dimensions. We consider d[subscript c]=1+? and study a transition to superconductivity in an ? expansion. The nontrivial ...

Shankar, R.

131

Search for Dark Matter Satellites of the Milky Way with the Fermi LAT  

E-Print Network (OSTI)

Results and discussion 4.1 Search for Dark Matter SatellitesNeutrino Ob- servatory IV: Searches for Dark Matter andFermi-LAT Collaboration], Search for Dark Matter Satellites

Zalewski, Sheridan Henryk

2013-01-01T23:59:59.000Z

132

Production of a Fermi gas of atoms in an optical lattice  

Science Conference Proceedings (OSTI)

We prepare a degenerate Fermi gas of potassium atoms by sympathetic cooling with rubidium atoms in a one-dimensional optical lattice. In a tight lattice, we observe a change of the density of states of the system, which is a signature of quasi two-dimensional confinement. We also find that the dipolar oscillations of the Fermi gas along the tight lattice are almost completely suppressed.

Modugno, G.; Ferlaino, F.; Heidemann, R.; Roati, G.; Inguscio, M. [LENS and Dipartimento di Fisica, Universita di Firenze, and INFM, Via Nello Carrara 1, 50019 Sesto Fiorentino, (Italy)

2003-07-01T23:59:59.000Z

133

Umklapp collisions and center of mass oscillation of a trapped Fermi gas  

E-Print Network (OSTI)

Starting from the the Boltzmann equation, we study the center of mass oscillation of a harmonically trapped normal Fermi gas in the presence of a one-dimensional periodic potential. We show that for values of the the Fermi energy above the first Bloch band the center of mass motion is strongly damped in the collisional regime due to umklapp processes. This should be contrasted with the behaviour of a superfluid where one instead expects the occurrence of persistent Josephson-like oscillations.

G. Orso; L. P. Pitaevskii; S. Stringari

2004-02-20T23:59:59.000Z

134

Theory of [ital p]-wave pairing in a two-dimensional Fermi gas  

SciTech Connect

The specific heat and susceptibility data for [sup 3]He on Grafoil are analyzed in the framework of the Landau Fermi-liquid theory. The data suggest that the dominant interaction between [sup 3]He quasiparticles is an attraction in the [ital p]-wave channel. We have calculated explicitly the superfluid transition temperature in a two-dimensional Fermi gas and found that the prefactor in [ital T][sub [ital c

Chubukov, A.V. (Department of Physics, Yale University, New Haven, Connecticut 06511-8167 (United States) P. L. Kapitza Institute for Physical Problems, Moscow (Russian Federation)); Sokol, A. (Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080 (United States) L. D. Landau Institute, Moscow (Russian Federation))

1994-01-01T23:59:59.000Z

135

New Kinetic Equations and Bogolyubov Energy Spectrum in a Fermi Quantum Plasma  

SciTech Connect

New type of quantum kinetic equations of the Fermi particles are derived. The Bogolyubov's type of dispersion relation, which is valid for the Bose fluid, is disclosed. Model of neutral Bose atoms in dense strongly coupled plasmas with attractive interaction is discussed. A set of fluid equations describing the quantum plasmas is obtained. Furthermore, the equation of the internal energy of degenerate Fermi plasma particles is derived.

Tsintsadze, Nodar L. [Department of Plasma Physics, E. Andronikashvili Institute of Physics, Tbilisi (Georgia); Tsintsadze, Levan N. [Graduate School of Science, Hiroshima University, Higashi-Hiroshima (Japan)

2009-10-08T23:59:59.000Z

136

Experiences with string matching on the Fermi Architecture  

Science Conference Proceedings (OSTI)

String matching is at the core of many real-world applications, such as security, bioinformatic, data mining. All these applications requires the ability to match always growing data sets against large dictionaries effectively, fastly and possibly in real time. Unfortunately, string matching is a computationally intensive procedure which poses significant challenges on current software and hardware implementations. Graphic Processing Units (GPU) have become an interesting target for such high-throughput applications, but the algorithms and the data structures need to be redesigned to be parallelized and adapted to the underlining hardware, coping with the limitations imposed by these architectures. In this paper we present an efficient implementation of the Aho-Corasick string matching algorithm on GPU, showing how we progressively redesigned the algorithm and the data structures to fit on the architecture. We then evaluate the implementation on single and multiple Tesla C2050 (T20 ``Fermi'' based) boards, comparing them to the previous Tesla C1060 (T10 based) solutions and equivalent multicore implementations on x86 CPUs. We discuss the various tradeoffs of the different architectures.

Tumeo, Antonino; Secchi, Simone; Villa, Oreste

2011-02-25T23:59:59.000Z

137

FERMI LARGE AREA TELESCOPE OBSERVATION OF SUPERNOVA REMNANT S147  

Science Conference Proceedings (OSTI)

We present an analysis of gamma-ray data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope in the region around supernova remnant (SNR) S147 (G180.0-1.7). A spatially extended gamma-ray source detected in an energy range of 0.2-10 GeV is found to coincide with SNR S147. We confirm its spatial extension at >5{sigma} confidence level. The gamma-ray flux is (3.8 {+-} 0.6) Multiplication-Sign 10{sup -8} photons cm{sup -2} s{sup -1}, corresponding to a luminosity of 1.3 Multiplication-Sign 10{sup 34} (d/1.3 kpc){sup 2} erg s{sup -1} in this energy range. The gamma-ray emission exhibits a possible spatial correlation with the prominent H{alpha} filaments of SNR S147. There is no indication that the gamma-ray emission comes from the associated pulsar PSR J0538+2817. The gamma-ray spectrum integrated over the remnant is likely dominated by the decay of neutral {pi} mesons produced through the proton-proton collisions in the filaments. The reacceleration of the pre-existing cosmic rays and subsequent adiabatic compression in the filaments is sufficient to provide the energy density required of high-energy protons.

Katsuta, J.; Uchiyama, Y.; Tanaka, T.; Tajima, H.; Bechtol, K.; Funk, S.; Lande, J. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Ballet, J. [Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France); Hanabata, Y. [Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan); Lemoine-Goumard, M. [Universite Bordeaux 1, CNRS/IN2p3, Centre d'Etudes Nucleaires de Bordeaux Gradignan, 33175 Gradignan (France); Takahashi, T., E-mail: katsuta@slac.stanford.edu, E-mail: uchiyama@slac.stanford.edu [Institute of Space and Astronautical Science, Japanese Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)

2012-06-20T23:59:59.000Z

138

SLAC National Accelerator Laboratory - Fermi-LAT Designer Awarded...  

NLE Websites -- All DOE Office Websites (Extended Search)

said. Now with the Santa Cruz Institute for Particle Physics, Atwood was a long-time SLAC National Accelerator Laboratory particle physicist who maintains his lab ties through...

139

DOE Science Showcase - 2009 Enrico Fermi Award Winners | OSTI...  

Office of Scientific and Technical Information (OSTI)

Database Orbital fluctuations and orbital flipping in RVOsub 3 perovskites. Electron-lattice interactions in nickel-oxide perovskites Electronic structure of CMR...

140

Fermi Gamma-ray Space Telescope: High-Energy Results from the First Year  

E-Print Network (OSTI)

The Fermi Gamma-ray Space Telescope (Fermi) was launched on June 11, 2008 and began its first year sky survey on August 11, 2008. The Large Area Telescope (LAT), a wide field-of-view pair-conversion telescope covering the energy range from 20 MeV to more than 300 GeV, is the primary instrument on Fermi. While this review focuses on results obtained with the LAT, the Gamma-ray Burst Monitor (GBM) complements the LAT in its observations of transient sources and is sensitive to X-rays and gamma-rays with energies between 8 keV and 40 MeV. During the first year in orbit, the Fermi LAT has observed a large number of sources that include active galaxies, pulsars, compact binaries, globular clusters, supernova remnants, as well as the Sun, the Moon and the Earth. The GBM and LAT together have uncovered surprising characteristics in the high-energy emission of gamma-ray bursts (GRBs) that have been used to set significant new limits on violations of Lorentz invariance. The Fermi LAT has also made important new measurements of the Galactic diffuse radiation and has made precise measurements of the spectrum of cosmic-ray electrons and positrons from 20 GeV to 1 TeV.

Peter F. Michelson; William B. Atwood; Steven Ritz

2010-10-31T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Appendices and Risk Assessment Spreadsheet Version No. Fermi National Accelerator Laboratory Engineering Manual  

NLE Websites -- All DOE Office Websites (Extended Search)

Links to related documents referenced within the Engineering Manual: Links to related documents referenced within the Engineering Manual: Appendices and Risk Assessment Spreadsheet Version No. Fermi National Accelerator Laboratory Engineering Manual 07/10 Overview i Engineering at Fermilab 4 ii Purpose and Scope 5 iii Responsibilities 7 Fermilab Engineering Process 1 Requirements and Specifications 9 2 Engineering Risk Assessment 10 3 Requirements and Specifications Review 17 4 System Design 18 5 Engineering Design Review 21 6 Procurement and Implementation 23 7 Testing and Validation 26 8 Release to Operations 28 9 Final Documentation 29 Closing Thoughts 31 Appendices 33 Table of Contents Overview Fermi National Accelerator Laboratory Engineering Manual Page No. Version No. Fermi National Accelerator Laboratory Engineering Manual

142

Fermi Site Office CX Determinations | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Fermi Site Office CX Determinations Fermi Site Office CX Determinations Safety, Security and Infrastructure (SSI) SSI Home Facilities and Infrastructure Safeguards & Security Environment, Safety and Health (ES&H) Organization Chart .pdf file (82KB) Phone Listing .pdf file (129KB) SC HQ Continuity of Operations (COOP) Implementation Plan .pdf file (307KB) Categorical Exclusion Determinations SLI & SS Budget Contact Information Safety, Security and Infrastructure U.S. Department of Energy SC-31/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-4097 F: (301) 903-7047 Categorical Exclusion (CX) Determinations Fermi Site Office CX Determinations Print Text Size: A A A RSS Feeds FeedbackShare Page Categorical Exclusion Determination Documents (CX Determinations): *

143

GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky August 26, 2008 - 3:20pm Addthis WASHINGTON, D.C. - The U.S. Department of Energy (DOE) and NASA announced today that the Gamma-Ray Large Area Space Telescope (GLAST) has revealed its first all-sky map in gamma rays. The onboard Large Area Telescope's (LAT) all-sky image-which shows the glowing gas of the Milky Way, blinking pulsars and a flaring galaxy billions of light-years away-was created using only 95 hours of "first light" observations, compared with past missions which took years to produce a similar image. Scientists expect the telescope will discover many new pulsars in our own galaxy, reveal powerful

144

Raman Spectrum of Supercritical C18O2 and Re-Evaluation of the Fermi Resonance  

Science Conference Proceedings (OSTI)

Because of its importance to so many processes, CO{sub 2} is one of the most studied molecules in science. However, we report here the discovery of a new phenomenon in the vibrational modes of supercritical CO{sub 2} upon isotopic labeling of both of its oxygens. The Raman spectrum of scC{sup 18}O{sub 2} shows a transposition of the components of the Fermi dyad from their normal positions. Analysis from ab initio molecular dynamics studies shows a previously unknown quantum mechanical influence of the {sup 18}O on the extent of mixing of the two vibrational modes that give rise to the Fermi dyad. This discovery confirms the assignments of the modes comprising the Fermi dyad of scCO{sub 2} and provides the groundwork for further advances in vibrational spectroscopic studies on this important molecule.

Windisch, Charles F.; Glezakou, Vassiliki Alexandra; Martin, Paul F.; McGrail, B. Peter; Schaef, Herbert T.

2012-02-28T23:59:59.000Z

145

Comparison between theory and experiment for universal thermodynamics of a homogeneous, strongly correlated Fermi gas  

SciTech Connect

We compare the theoretical predictions for universal thermodynamics of a homogeneous, strongly correlated Fermi gas with the latest experimental measurements reported by the ENS group [S. Nascimbene et al., Nature (London) 463, 1057 (2010)] and the Tokyo group [M. Horikoshi et al., Science 327, 442 (2010)]. The theoretical results are obtained using two diagrammatic theories, together with a virial expansion theory combined with a Pade approximation. We find good agreement between theory and experiment. In particular, the virial expansion, using a Pade approximation up to third order, describes the experimental results extremely well down to the superfluid transition temperature, T{sub c{approx}}0.16T{sub F}, where T{sub F} is the Fermi temperature. The comparison in this work complements our previous comparative study on the universal thermodynamics of a strongly correlated but trapped Fermi gas. The comparison also raises interesting issues about the unitary entropy and the applicability of the Pade approximation.

Hu Hui; Liu Xiaji; Drummond, Peter D. [ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122, Victoria (Australia)

2011-06-15T23:59:59.000Z

146

7F-7/17/98 Fermi News  

NLE Websites -- All DOE Office Websites (Extended Search)

Division, on June 29, 1998, with a Fermilab Employee Recognition Award. Petravick led the group creating the data "pipeline" systems for the Sloan Digital Sky Survey....

147

The Search for Dark Matter with the Fermi Gamma Ray Space Telescope  

SciTech Connect

The Fermi Gamma-Ray Space Telescope has been scanning the gamma ray sky since it was launched by NASA in June 2008 and has a mission lifetime goal of 10 years. Largely due to our particle physics heritage, one of the main physics topics being studied by the Fermi LAT Collaboration is the search for dark matter via indirect detection. My talk will review the progress of these studies, something on how the LAT detector enables them, and expectations for the future. I will discuss both gamma-ray and (electron + positron) searches for dark matter, and some resulting theoretical implications.

Bloom, Elliott (SLAC)

2011-03-30T23:59:59.000Z

148

Natural orbits of atomic Cooper pairs in a nonuniform Fermi gas  

E-Print Network (OSTI)

We examine the basic mode structure of atomic Cooper pairs in an inhomogeneous Fermi gas. Based on the properties of Bogoliubov quasi-particle vacuum, the single particle density matrix and the anomalous density matrix share the same set of eigenfunctions. These eigenfunctions correspond to natural pairing orbits associated with the BCS ground state. We investigate these orbits for a Fermi gas in a spherical harmonic trap, and construct the wave function of a Cooper pair in the form of Schmidt decomposition. The issue of spatial quantum entanglement between constituent atoms in a pair is addressed.

Y. H. Pong; C. K. Law

2006-05-08T23:59:59.000Z

149

Annealing, lattice disorder and non-Fermi liquid behavior in UCu4Pd  

Science Conference Proceedings (OSTI)

The magnetic and electronic properties of non-Fermi liquid UCu{sub 4Pd} depend on annealing conditions. Local structural changes due to this annealing are reported from UL{sub III}- and Pd K-edge x-ray absorption fine-structure measurements. In particular, annealing decreases the fraction of Pd atoms on nominally Cu 16e sites and the U-Cu pair-distance distribution width. This study provides quantitative information on the amount of disorder in UCu{sub 4Pd} and allows an assessment of its possible importance to the observed non-Fermi liquid behavior.

Booth, C.H.; Scheidt, E.-W.; Killer, U.; Weber, A.; Kehrein, S.

2002-07-30T23:59:59.000Z

150

Sensitivity of the FERMI Detectors to Gamma-Ray Bursts from Evaporating Primordial Black Holes (PBHs)  

E-Print Network (OSTI)

Primordial Black Holes (PBHs), which may have been created in the early Universe, are predicted to be detectable by their Hawking radiation. The Fermi Gamma-ray Space Telescope observatory offers increased sensitivity to the gamma-ray bursts produced by PBHs with an initial mass of $\\sim 5\\times 10^{14}$ g expiring today. PBHs are candidate progenitors of unidentified Gamma-Ray Bursts (GRBs) that lack X-ray afterglow. We propose spectral lag, which is the temporal delay between the high and low energy pulses, as an efficient method to identify PBH evaporation events with the Fermi Large Area Telescope (LAT).

T. N. Ukwatta; Jane H. MacGibbon; W. C. Parke; K. S. Dhuga; S. Rhodes; A. Eskandarian; N. Gehrels; L. Maximon; D. C. Morris

2010-03-23T23:59:59.000Z

151

2009 Fermi Symposium, Washington, D.C., Nov. 2-5 1 Photon dispersion in causal sets  

E-Print Network (OSTI)

of light may be observable in Fermi time- and energy-tagged data on variable sources, such as gamma-ray by the Fermi Gamma Ray Space Telescope [1]. The expectation from general considerations [2] is that the scale bursts (GRB) and active galactic nuclei (AGN). We describe a method to compute the size of this effect

SimiĂŚ, Slobodan N.

152

Enrico Fermi Achieves First Self Sustain Nuclear Chain Reaction...  

NLE Websites -- All DOE Office Websites (Extended Search)

Y-12 Earn 11 R&D 100 Awards Jul 2, 2013 US, International Partners Remove Last Remaining HEU from Vietnam, Set Nuclear Security Milestone View All > Timeline Curious about NNSA...

153

The Fermi And Gamov-Teller {beta}-Decay Excitations Of The Scissors Mode 1+ States  

Science Conference Proceedings (OSTI)

In this study, the allowed Gamov-Teller (GT) and Fermi {beta} transitions from 1+-state of the odd-odd nuclei to 1+-states are considered. Calculation of the {beta} transition matrix elements is performed in the phonon description and an analytical expressions for MF and MGT matrix elements are obtained for the first time.

Yildirm, Z.; Ertugral, F.; Kuliev, A. A. [Sakarya University, Physics Department, Adapazari (Turkey); Guliyev, E. [Institute of Physics, National Academy of Sciences, Baku (Azerbaijan)

2007-04-23T23:59:59.000Z

154

Dark matter and pulsar signals for Fermi LAT, PAMELA, ATIC, HESS and WMAP data  

E-Print Network (OSTI)

We analyze new diffuse gamma-ray data from the Fermi Gamma-ray Space Telescope, which do not confirm an excess in the EGRET data at galactic mid-latitudes, in combination with measurements of electron and positron fuxes from PAMELA, Fermi and HESS within the context of three possible sources: dark matter (DM) annihilation or decay into charged leptons, and a continuum distribution of pulsars. We allow for variations in the backgrounds, consider several DM halo profiles, and account for systematic uncertainties in data where possible. We find that all three scenarios represent the data well. The pulsar description holds for a wide range of injection energy spectra. We compare with ATIC data and the WMAP haze where appropriate, but do not fit these data since the former are discrepant with Fermi data and the latter are subject to large systematic uncertainties. We show that for cusped halo profiles, Fermi could observe a spectacular gamma-ray signal of DM annihilation from the galactic center while seeing no excess at mid-latitudes.

V. Barger; Y. Gao; W. -Y. Keung; D. Marfatia; G. Shaughnessy

2009-04-14T23:59:59.000Z

155

Establishing Site X: Letter, Arthur H. Compton to Enrico Fermi, September 14, 1942  

DOE R&D Accomplishments (OSTI)

This letter from Compton to Fermi describes developments bearing on the establishment of site X (which, as of the letter date, is definitely determined as at the Tennessee Valley) for the construction of a pile and associated pilot plant buildings, describes the situation as of the letter date, and offers counsel as to how to proceed.

Compton, A. H.

1942-09-00T23:59:59.000Z

156

ELSEVIER Physica B 241 243 (1998) 859 861 Quantum critical scattering in uranium non-Fermi  

E-Print Network (OSTI)

ELSEVIER Physica B 241 243 (1998) 859 861 BD Quantum critical scattering in uranium nonPdxprovides evidence ofsingle-impurity quantum critical fluctuations of the uranium 5f-electrons. The scaling]. These non-Fermi liquids, which usually contain uranium or cerium ions, ex- hibit weak power law

Aronson, Meigan

157

Equilibration and Universal Heat Conduction in Fermi-Pasta-Ulam Chains Trieu Mai,1  

E-Print Network (OSTI)

Equilibration and Universal Heat Conduction in Fermi-Pasta-Ulam Chains Trieu Mai,1 Abhishek Dhar,2 heat conduction. The reason why earlier simulations have obtained systematically higher exponents not been fully inves- tigated, even though the discussion of heat conductivity is in terms of Fourier's law

California at Santa Cruz, University of

158

Extending the Fermi-LAT Data Processing Pipeline to the Grid  

E-Print Network (OSTI)

The Data Handling Pipeline ("Pipeline") has been developed for the Fermi Gamma-Ray Space Telescope (Fermi) Large Area Telescope (LAT) which launched in June 2008. Since then it has been in use to completely automate the production of data quality monitoring quantities, reconstruction and routine analysis of all data received from the satellite and to deliver science products to the collaboration and the Fermi Science Support Center. Aside from the reconstruction of raw data from the satellite (Level 1), data reprocessing and various event-level analyses are also reasonably heavy loads on the pipeline and computing resources. These other loads, unlike Level 1, can run continuously for weeks or months at a time. In addition it receives heavy use in performing production Monte Carlo tasks. The software comprises web-services that allow online monitoring and provides charts summarizing work flow aspects and performance information. The server supports communication with several batch systems such as LSF and BQS and recently also Sun Grid Engine and Condor. This is accomplished through dedicated job control services that for Fermi are running at SLAC and the other computing site involved in this large scale framework, the Lyon computing center of IN2P3. While being different in the logic of a task, we evaluate a separate interface to the Dirac system in order to communicate with EGI sites to utilize Grid resources, using dedicated Grid optimized systems rather than developing our own. (abstract abridged)

Stephan Zimmer; Luisa Arrabito; Tom Glanzman; Tony Johnson; Claudia Lavalley; Andrei Tsaregorodtsev

2012-12-17T23:59:59.000Z

159

Bose-Fermi variational theory of the BEC-Tonks crossover  

E-Print Network (OSTI)

A number-conserving hybrid Bose-Fermi variational theory is developed and applied to investigation of the BEC-Tonks gas crossover in toroidal and long cylindrical traps of high aspect ratio, where strong many-body correlations and condensate depletion occur.

M. D. Girardeau; E. M. Wright

2001-06-25T23:59:59.000Z

160

U.S. Department of Energy Awards Contract for Management and Operation of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

U.S. Department of Energy Awards Contract for Management and U.S. Department of Energy Awards Contract for Management and Operation of Fermi National Accelerator Laboratory to the Fermi Research Alliance, LLC U.S. Department of Energy Awards Contract for Management and Operation of Fermi National Accelerator Laboratory to the Fermi Research Alliance, LLC November 1, 2006 - 9:25am Addthis BATAVIA, ILLINOIS -- The U.S. Department of Energy (DOE) has awarded a new $1.575 billion, five-year contract for management and operation of Fermi National Accelerator Laboratory (FNAL) to the Fermi Research Alliance, LLC (FRA), owned jointly by the University of Chicago (UChicago) and Universities Research Association, Inc. (URA). "The quality of the new contract is a direct consequence of the competition process," DOE Under Secretary for Science Dr. Raymond L. Orbach said today

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

CHARACTERIZING THE OPTICAL VARIABILITY OF BRIGHT BLAZARS: VARIABILITY-BASED SELECTION OF FERMI ACTIVE GALACTIC NUCLEI  

SciTech Connect

We investigate the use of optical photometric variability to select and identify blazars in large-scale time-domain surveys, in part to aid in the identification of blazar counterparts to the {approx}30% of {gamma}-ray sources in the Fermi 2FGL catalog still lacking reliable associations. Using data from the optical LINEAR asteroid survey, we characterize the optical variability of blazars by fitting a damped random walk model to individual light curves with two main model parameters, the characteristic timescales of variability {tau}, and driving amplitudes on short timescales {sigma}-circumflex. Imposing cuts on minimum {tau} and {sigma}-circumflex allows for blazar selection with high efficiency E and completeness C. To test the efficacy of this approach, we apply this method to optically variable LINEAR objects that fall within the several-arcminute error ellipses of {gamma}-ray sources in the Fermi 2FGL catalog. Despite the extreme stellar contamination at the shallow depth of the LINEAR survey, we are able to recover previously associated optical counterparts to Fermi active galactic nuclei with E {>=} 88% and C = 88% in Fermi 95% confidence error ellipses having semimajor axis r < 8'. We find that the suggested radio counterpart to Fermi source 2FGL J1649.6+5238 has optical variability consistent with other {gamma}-ray blazars and is likely to be the {gamma}-ray source. Our results suggest that the variability of the non-thermal jet emission in blazars is stochastic in nature, with unique variability properties due to the effects of relativistic beaming. After correcting for beaming, we estimate that the characteristic timescale of blazar variability is {approx}3 years in the rest frame of the jet, in contrast with the {approx}320 day disk flux timescale observed in quasars. The variability-based selection method presented will be useful for blazar identification in time-domain optical surveys and is also a probe of jet physics.

Ruan, John J.; Anderson, Scott F.; MacLeod, Chelsea L.; Becker, Andrew C.; Davenport, James R. A.; Ivezic, Zeljko [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States); Burnett, T. H. [Department of Physics, University of Washington, Seattle, WA 98195-1560 (United States); Kochanek, Christopher S. [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Plotkin, Richard M. [Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109 (United States); Sesar, Branimir [Division of Physics, Mathematics and Astronomy, Caltech, Pasadena, CA 91125 (United States); Stuart, J. Scott, E-mail: jruan@astro.washington.edu [Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, MA 02420-9108 (United States)

2012-11-20T23:59:59.000Z

162

A Confining Non-Local Four-Fermi Interaction from Yang-Mills Theory in a Stochastic Background  

E-Print Network (OSTI)

We derive a non-local four-fermi term with a linear potential from Yang-Mills Theory in a stochastic background. The stochastic background is a class of classical configuration derived from the non-linear gauge.

Jose A. Magpantay

2004-12-10T23:59:59.000Z

163

Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas  

SciTech Connect

Wave-vector resolved radio frequency spectroscopy data for an ultracold trapped Fermi gas are reported for several couplings at T{sub c}, and extensively analyzed in terms of a pairing-fluctuation theory. We map the evolution of a strongly interacting Fermi gas from the pseudogap phase into a fully gapped molecular Bose gas as a function of the interaction strength, which is marked by a rapid disappearance of a remnant Fermi surface in the single-particle dispersion. We also show that our theory of a pseudogap phase is consistent with a recent experimental observation as well as with quantum Monte Carlo data of thermodynamic quantities of a unitary Fermi gas above T{sub c}.

Perali, A.; Palestini, F.; Pieri, P.; Strinati, G. C. [Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino (Italy); Stewart, J. T.; Gaebler, J. P.; Drake, T. E.; Jin, D. S. [JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder, Colorado 80309-0449 (United States)

2011-02-11T23:59:59.000Z

164

Ground Broken for New Job-Creating Accelerator Research Facility at DOE’s Fermi National Accelerator Laboratory in Illinois  

Energy.gov (U.S. Department of Energy (DOE))

WASHINGTON, D.C. – Today, ground was broken for a new accelerator research facility being built at the Department of Energy’s (DOE’s) Fermi National Accelerator Laboratory (Fermilab) in Batavia,...

165

Phase-space methods in nuclear reactions around the Fermi energy  

E-Print Network (OSTI)

Some prescriptions for in-medium complex particle production in nuclear reactions are proposed. They have been implemented in two models to simulate nucleon-nucleus (nIPSE) and nucleus-nucleus (HIPSE) reactions around the Fermi energy \\cite{Lac04,Lac05}. Our work emphasizes the effect of randomness in cluster formation, the importance of the nucleonic Fermi motion as well as the role of conservation laws. The key role of the phase-space exploration before and after secondary decay is underlined. This is illustrated in the case of two debated issues: the memory loss of the entrance channel in central collisions and the $(N,Z)$ partitions after the pre-equilibrium stage.

Denis Lacroix; Dominique Durand; Gregory Lehaut; Olivier Lopez; Emmanuel Vient

2006-01-18T23:59:59.000Z

166

Stability of a fully magnetized ferromagnetic state in repulsively interacting ultracold Fermi gases  

SciTech Connect

We construct a variational wave function to study whether a fully polarized Fermi sea of ultracold atoms is energetically stable against a single spin flip. Our variational wave function contains short-range correlations at least to the same level as Gutzwiller's projected wave function. For the Hubbard lattice model and the continuum model with pure repulsive interaction, we show that a fully polarized Fermi sea is generally unstable even for infinite repulsive strength. By contrast, for a resonance model, the ferromagnetic state is possible if the s-wave scattering length is positive and sufficiently large and the system is prepared to be orthogonal to the molecular bound state. However, we cannot rule out the possibility that more exotic correlations can destabilize the ferromagnetic state.

Cui Xiaoling [Beijing National Laboratory for Condensed Matter Physics and Institute for Physics, Chinese Academy of Science, Beijing, 100190 (China); Zhai Hui [Institute for Advanced Study, Tsinghua University, Beijing, 100084 (China)

2010-04-15T23:59:59.000Z

167

Universal equation of state and pseudogap in the two dimensional Fermi gas  

E-Print Network (OSTI)

We determine the thermodynamic properties and the spectral function for a homogeneous two-dimensional Fermi gas in the normal state using the Luttinger-Ward, or self-consistent T-matrix, approach. The equation of state for the article density deviates strongly from that of the ideal Fermi gas even for moderate interactions, and there is a pronounced pseudogap regime above the superfluid transition temperature. The spectral function shows a Bogoliubov-like dispersion with back-bending, and the density of states is significantly suppressed near the chemical potential. We compute the superfluid transition temperature for a finite system in the crossover from weak to strong coupling. The contact density at low temperature increases with interaction and compares favourably both with experiment and zero-temperature quantum Monte Carlo results.

Marianne Bauer; Meera M. Parish; Tilman Enss

2013-11-05T23:59:59.000Z

168

All-Sky Earth Occultation Observations with the Fermi Gamma Ray Burst Monitor  

E-Print Network (OSTI)

Using the Gamma Ray Burst Monitor (GBM) on-board Fermi, we are monitoring the hard X-ray/soft gamma ray sky using the Earth occultation technique. Each time a source in our catalog enters or exits occultation by the Earth, we measure its flux using the change in count rates due to the occultation. Currently we are using CTIME data with 8 energy channels spanning 8 keV to 1 MeV for the GBM NaI detectors and spanning 150 keV to 40 MeV for the GBM BGO detectors. Our preliminary catalog consists of galactic X-ray binaries, the Crab Nebula, and active galactic nuclei. In addition, to Earth occultations, we have observed numerous occultations with Fermi's solar panels. We will present early results. Regularly updated results can be found on our website http://gammaray.nsstc.nasa.gov/gbm/science/occultation

Wilson-Hodge, Colleen A; Bhat, P N; Briggs, M S; Chaplin, V; Connaughton, V; Camero-Arranz, A; Case, G; Cherry, M; Rodi, J; Finger, M H; Jenke, P; Haynes, R H

2009-01-01T23:59:59.000Z

169

A new Fermi smearing approach for scattering of multi-GeV electrons by nuclei  

E-Print Network (OSTI)

The cross section for electron scattering by nuclei at high momentum transfers is calculated within the Fermi smearing approximation (FSA), where binding effects on the struck nucleon are introduced via the relativistic Hartree approximation (RHA). The model naturally preserves current conservation, since the response tensor for an off-shell nucleon conserves the same form that for a free one but with an effective mass. Different parameterizations for the inelastic nucleon structure function, are analyzed. The smearing at the Fermi surface is introduced through a momentum distribution obtained from a perturbative nuclear matter calculation. Recent CEBAF data on inclusive scattering of 4.05 GeV electrons on $^{56}$Fe are well reproduced for all measured geometries for the first time, as is evident from the comparison with previous calculations.

A. Mariano; P. Podesta Lerma

2003-05-29T23:59:59.000Z

170

THE FERMI GBM GAMMA-RAY BURST SPECTRAL CATALOG: THE FIRST TWO YEARS  

Science Conference Proceedings (OSTI)

We present systematic spectral analyses of gamma-ray bursts (GRBs) detected by the Fermi Gamma-Ray Burst Monitor (GBM) during its first two years of operation. This catalog contains two types of spectra extracted from 487 GRBs, and by fitting four different spectral models, this results in a compendium of over 3800 spectra. The models were selected based on their empirical importance to the spectral shape of many GRBs, and the analysis performed was devised to be as thorough and objective as possible. We describe in detail our procedure and criteria for the analyses, and present the bulk results in the form of parameter distributions. This catalog should be considered an official product from the Fermi GBM Science Team, and the data files containing the complete results are available from the High-Energy Astrophysics Science Archive Research Center.

Goldstein, Adam; Burgess, J. Michael; Preece, Robert D.; Briggs, Michael S.; Guiriec, Sylvain; Connaughton, Valerie; Paciesas, William S.; Bhat, P. N.; Chaplin, Vandiver [Physics Department, University of Alabama in Huntsville, 320 Sparkman Drive, Huntsville, AL 35805 (United States); Van der Horst, Alexander J.; Meegan, Charles A. [Universities Space Research Association, 320 Sparkman Drive, Huntsville, AL 35805 (United States); Wilson-Hodge, Colleen A.; Fishman, Gerald J. [Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States); Von Kienlin, Andreas; Bissaldi, Elisabetta; Diehl, Roland; Foley, Suzanne [Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching (Germany); Fitzpatrick, Gerard [School of Physics, University College Dublin, Belfield, Stillorgan Road, Dublin 4 (Ireland); Gibby, Melissa; Giles, Misty [Jacobs Technology, 1500 Perimeter Parkway, Huntsville, AL 35806 (United States); and others

2012-03-01T23:59:59.000Z

171

Quantum oscillations in ultracold Fermi gases : realizations with rotating gases or artificial gauge fields  

E-Print Network (OSTI)

We consider the angular momentum of a harmonically trapped, noninteracting Fermi gas subject to either rotation or to an artificial gauge field. The angular momentum of the gas is shown to display oscillations as a function of the particle number or chemical potential. This phenomenon is analogous to the de Haas - van Alphen oscillations of the magnetization in the solid-state context. However, key differences exist between the solid-state and ultracold atomic gases that we point out and analyze. We explore the dependence of the visibility of these oscillations on the physical parameters and propose two experimental protocols for their observation. Due to the very strong dependence of the amplitude of the oscillations on temperature, we propose their use as a sensitive thermometer for Fermi gases in the low temperature regime.

Charles Grenier; Corinna Kollath; Antoine Georges

2012-12-26T23:59:59.000Z

172

Hydrogen-bond Dynamics and Fermi Resonance in High-pressure Methane Filled Ice  

DOE Green Energy (OSTI)

High-pressure, variable temperature infrared spectroscopy and first-principles calculations on the methane filled ice structure (MH-III) at high pressures are used to investigate the vibrational dynamics related to pressure induced modifications in hydrogen bonding. Infrared spectroscopy of isotopically dilute solutions of H{sub 2}O in D{sub 2}O is employed together with first-principles calculations to characterize proton dynamics with the pressure induced shortening of hydrogen bonds. A Fermi resonance is identified and shown to dominate the infrared spectrum in the pressure region between 10 and 30 GPa. Significant differences in the effects of the Fermi resonance observed between 10 and 300 K arise from the double-well potential energy surface of the hydrogen bond and quantum effects associated with the proton dynamics.

Klug,D.; Tse, J.; Liu, Z.; Hemley, R.

2006-01-01T23:59:59.000Z

173

Gamma-ray burst observations with new generation imaging atmospheric Cerenkov Telescopes in the FERMI era  

SciTech Connect

After the launch and successful beginning of operations of the FERMI satellite, the topics related to high-energy observations of gamma-ray bursts have obtained a considerable attention by the scientific community. Undoubtedly, the diagnostic power of high-energy observations in constraining the emission processes and the physical conditions of gamma-ray burst is relevant. We briefly discuss how gamma-ray burst observations with ground-based imaging array Cerenkov telescopes, in the GeV-TeV range, can compete and cooperate with FERMI observations, in the MeV-GeV range, to allow researchers to obtain a more detailed and complete picture of the prompt and afterglow phases of gamma-ray bursts.

Covino, S.; Campana, S. [INAF/Brera Astronomical Observatory, Via Bianchi 46, 23807, Merate (Saint Lucia) (Italy); Garczarczyk, M. [Max-Planck-Institut fuer Physik, Foehringer Ring 6, D-80805 Muenchen (Germany); IFAE, Edifici Cn., Campus UAB, 08193 Bellaterra (Spain); Galante, N. [Max-Planck-Institut fuer Physik, Foehringer Ring 6, D-80805 Muenchen (Germany); Gaug, M. [Instituto de Astrofisica de Canarias, via Lactea s/n, 38205 La Laguna, Tenerife (Spain); Antonelli, A. [INAF/Rome Astronomical Observatory, Via Frascati 33, 00044, Monte Porzio (Roma) (Italy); Bastieri, D. [Universita di Padova and Istituto Nazionale di Fisica Nucleare (INFN), 35131, Padova (Italy); Longo, F. [Dipartimento Fisica and INFN Trieste, 34127 Trieste (Italy); Scapin, V. [Universita di Udine, and INFN Trieste, 33100 Udine (Italy)

2009-04-08T23:59:59.000Z

174

Searches for cosmic-ray electron anisotropies with the Fermi Large Area Telescope  

SciTech Connect

The Large Area Telescope on board the Fermi satellite (Fermi LAT) detected more than 1.6x10{sup 6} cosmic-ray electrons/positrons with energies above 60 GeV during its first year of operation. The arrival directions of these events were searched for anisotropies of angular scale extending from {approx}10 deg. up to 90 deg., and of minimum energy extending from 60 GeV up to 480 GeV. Two independent techniques were used to search for anisotropies, both resulting in null results. Upper limits on the degree of the anisotropy were set that depended on the analyzed energy range and on the anisotropy's angular scale. The upper limits for a dipole anisotropy ranged from {approx}0.5% to {approx}10%.

Ackermann, M.; Ajello, M.; Bechtol, K.; Berenji, B.; Bloom, E. D.; Borgland, A. W.; Bouvier, A.; Buehler, R.; Cameron, R. A.; Charles, E.; Chiang, J.; Claus, R.; Digel, S. W.; Couto e Silva, E. do; Drell, P. S.; Dubois, R.; Focke, W. B.; Funk, S.; Glanzman, T.; Godfrey, G. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94305 (United States)

2010-11-01T23:59:59.000Z

175

Production mechanism of hot nuclei in violent collisions in the Fermi energy domain  

E-Print Network (OSTI)

A production mechanism of highly excited nuclei formed in violent collisions in the Fermi energy domain is investigated. The collision of two nuclei is decomposed into several stages which are treated separately. Simplified exciton concept is used for the description of pre-equilibrium emission. A modified spectator-participant scenario is used where motion along classical Coulomb trajectories is assumed. The participant and one of the spectator zones undergo incomplete fusion. Excitation energies of both cold and hot fragment are determined. Results of the calculation are compared to recent experimental data in the Fermi energy domain. Data on hot projectile-like, mid-velocity and fusion-like sources are described consistently. Geometric aspects of pre-equilibrium emission are revealed. Explanations to previously unexplained experimental phenomena are given. Energy deposited into non-thermal degrees of freedom is estimated.

M. Veselsky

2001-07-25T23:59:59.000Z

176

Phase separation in a polarized Fermi gas with spin-orbit coupling  

SciTech Connect

We study the phase separation of a spin-polarized Fermi gas with spin-orbit coupling near a wide Feshbach resonance. As a result of the competition between spin-orbit coupling and population imbalance, the phase diagram for a uniform gas develops a rich structure of phase separation involving topologically nontrivial gapless superfluid states. We then demonstrate the phase separation induced by an external trapping potential and discuss the optimal parameter region for the experimental observation of the gapless superfluid phases.

Yi, W.; Guo, G.-C. [Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui, 230026 (China)

2011-09-15T23:59:59.000Z

177

On the energy-momentum spectrum of a homogeneous Fermi gas  

E-Print Network (OSTI)

We consider translation invariant quantum systems in thermodynamic limit. We argue that their energy-momentum spectra should have shapes consistent with effective models involving quasiparticles. Our main example is second quantized homogeneous interacting Fermi gas in a large cubic box with periodic boundary conditions, at zero temperature. We expect that its energy-momentum spectrum has a positive energy gap and a positive critical velocity.

Jan Derezi?ski; Krzysztof A. Meissner; Marcin Napiórkowski

2011-11-03T23:59:59.000Z

178

Liquid-Gas Coexistence and Critical Behavior in Boxed Pseudo-Fermi Matter  

E-Print Network (OSTI)

A schematic model is presented that allows one to study the behavior of interacting pseudo-Fermi matter locked in a thermostatic box. As a function of the box volume and temperature, the matter is seen to show all of the familiar charactersitics of a Van der Waals gas, which include the coexistence of two phases under certain circumstances and the presence of a critical point.

Jan Tőke; Jun Lu; W. Udo Schröder

2002-12-18T23:59:59.000Z

179

Universality of one-dimensional Fermi systems, II. The Luttinger liquid structure  

E-Print Network (OSTI)

We complete the proof started in "Universality of one-dimensional Fermi systems, I." of the universal Luttinger liquid relations for a general model of spinning fermions on a lattice, by making use of the Ward Identities due to asymptotically emerging symmetries. This is done by introducing an effective model verifying extra symmetries and by relating its critical exponents to those of the fermion lattice gas by suitable fine tuning of the parameters.

Giuseppe Benfatto; Pierluigi Falco; Vieri Mastropietro

2013-03-15T23:59:59.000Z

180

A model for the evaluation of fault tolerance in the FERMI system  

Science Conference Proceedings (OSTI)

Experiments of high energy physics planned at the Large Hadron Collider (LHC) at CERN (CH) require digital data acquisition systems with high throughput. Such systems need also be fault tolerant to the permanent and transient faults induced by radiation, ... Keywords: FERMI microsystem, Large Hadron Collider, VLSI, VLSI devices, data acquisition, digital data acquisition system, fault tolerance, fault tolerant computing, high energy physics, high energy physics instrumentation computing, model, nuclear electronics, radiation effects

A. Antola; L. Breveglieri

1995-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

8-22SF-7/31/98 Fermi News  

NLE Websites -- All DOE Office Websites (Extended Search)

1, 1998 1, 1998 Number 15 f INSIDE 2 Users' Meeting 4 Thesis Award 5 Pierre Auger 6 NuMI 8 The Other Essay 9 Pulling Cable 10 GSA Conference "People are fascinated by the questions posed by physicists- they just don't know it." ~ Lawrence M. Krauss, author, The Physics of Star Trek Krauss Gives Users a Mission I n his keynote speech to the Fermilab Users' Annual Meeting, author Larry Krauss challenged all physicists to boldly go into the realm of communicating with the public, explaining that physicists attempt to answer the very questions that incite our wonder about existence. Story on Page 2. Photo by Jenny Mullins mass, and the process of tracking down a single fleeting neutrino incident in a gargantuan liquid-filled detector. "We see evidence of a neutrino when a

182

On The {\\it Fermi} -Lat Surplus of the Diffuse Galactic Gamma-Ray Emission  

E-Print Network (OSTI)

Recent observations of the diffuse Galactic \\gr emission (DGE) by the {\\it Fermi} Large Area Telescope ({\\it Fermi}-LAT) have shown significant deviations, above a few GeV until about 100 GeV, from DGE models that use the GALPROP code for the propagation of cosmic ray (CR) particles outside their sources in the Galaxy and their interaction with the target distributions of the interstellar gas and radiation fields. The surplus of radiation observed is most pronounced in the inner Galaxy, where the concentration of CR sources is strongest. The present study investigates this "{\\it Fermi}-LAT Galactic Plane Surplus" by estimating the \\gr emission from the sources themselves, which is disregarded in the above DGE models. It is shown that indeed the expected hard spectrum of CRs, still confined in their sources (SCRs), can explain this surplus. The method is based on earlier studies regarding the so-called EGRET GeV excess which by now is generally interpreted as an instrumental effect. The contribution from SCRs ...

Voelk, Heinrich J

2013-01-01T23:59:59.000Z

183

The Animated Gamma-ray Sky Revealed by the Fermi Gamma-ray Space Telescope  

SciTech Connect

The Fermi Gamma-ray Space Telescope has been observing the sky in gamma-rays since August 2008. In addition to breakthrough capabilities in energy coverage (20 MeV-300 GeV) and angular resolution, the wide field of view of the Large Area Telescope enables observations of 20% of the sky at any instant, and of the whole sky every three hours. It has revealed a very animated sky with bright gamma-ray bursts flashing and vanishing in minutes, powerful active galactic nuclei flaring over hours and days, many pulsars twinkling in the Milky Way, and X-ray binaries shimmering along their orbit. Most of these variable sources had not been seen by the Fermi predecessor, EGRET, and the wealth of new data already brings important clues to the origin of the high-energy emission and particles powered by the compact objects. The telescope also brings crisp images of the bright gamma-ray emission produced by cosmic-ray interactions in the interstellar medium, thus allowing to measure the cosmic nuclei and electron spectra across the Galaxy, to weigh interstellar clouds, in particular in the dark-gas phase. The telescope sensitivity at high energy will soon provide useful constraints on dark-matter annihilations in a variety of environments. I will review the current results and future prospects of the Fermi mission.

Grenier, Isabelle (University Paris Diderot and CEA Saclay, France)

2009-04-01T23:59:59.000Z

184

Dependence of information entropy of uniform Fermi systems on correlations and thermal effects  

SciTech Connect

The influence of correlations of uniform Fermi systems (nuclear matter, electron gas, and liquid {sup 3}He) on Shannon's information entropy, S, is studied. S is the sum of the information entropies in position and momentum spaces. It is found that, for three different Fermi systems with different particle interactions, the correlated part of S (S{sub cor}) depends on the correlation parameter of the systems or on the discontinuity gap of the momentum distribution through two parameter expressions. The values of the parameters characterize the strength of the correlations. A two parameter expression also holds between S{sub cor} and the mean kinetic energy (K) of the Fermi system. The study of thermal effects on the uncorrelated electron gas leads to a relation between the thermal part of S (S{sub thermal}) and the fundamental quantities of temperature, thermodynamical entropy, and the mean kinetic energy. It is found that, in the case of low temperature limit, the expression connecting S{sub thermal} with K is the same to the one which connects S{sub cor} with K. There are only some small differences on the values of the parameters. Thus, regardless of the reason (correlations or thermal) that changes K, S takes almost the same value.

Moustakidis, Ch.C.; Massen, S.E. [Department of Theoretical Physics, Aristotle University of Thessaloniki, GR-54124, Thessaloniki (Greece)

2005-01-15T23:59:59.000Z

185

U.S. Department of Energy Awards Contract for Management and Operation of  

Office of Science (SC) Website

U.S. U.S. Department of Energy Awards Contract for Management and Operation of Fermi National Accelerator Laboratory to the Fermi Research Alliance, LLC News Featured Articles Science Headlines 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 11.01.06 U.S. Department of Energy Awards Contract for Management and Operation of Fermi National Accelerator Laboratory to the Fermi Research Alliance, LLC Print Text Size: A A A Subscribe FeedbackShare Page BATAVIA, ILLINOIS - The U.S. Department of Energy (DOE) has awarded a new $1.575 billion, five-year contract for management and operation of Fermi National Accelerator Laboratory (FNAL) to the Fermi Research Alliance, LLC

186

Determining the Appropriate Package and Transportation Methodology for the Detroit Edison, Fermi II Msrs and Associated Components  

SciTech Connect

During the spring of 2005, Detroit Edison, Enrico Fermi II Nuclear Power Station (Fermi) decided to disposition two MSRs and associated components scheduled for replacement in the spring of 2006 during the MSR Replacement Outage. Of concern to Fermi was the proper packaging and transportation methodology when dis-positioning a component measuring approximately 110' in length and 13' in diameter and weighing over 300 tons. Upon removal from the Turbine Deck the retired MSRs and associated components were turned over to the Rad Waste Group for packaging and final disposition. Fermi requested quotations from vendors to package, transport, and disposition the MSRs and associated components. However, multiple Vendors informed Fermi that the size and weight of the MSRs were questionable in passing permitting requirements and would require segmentation and volume reduction on site or at a waste processor. Fermi contracted with MHF Logistical Solutions (MHF-LS) based on their ability to receive clearances for shipping the MSRs in one piece via two heavy haul rail conveyances acting as a bolstered load with professionally engineered blocking and bracing configured to support the retired MSRs. (authors)

Weber, B. [Detroit Edison Company/Enrico Fermi II Nuclear Power Station, Newport, MI (United States); Dempsey, S. [MHF Logistical Solutions, Oak Ridge, TN (United States)

2007-07-01T23:59:59.000Z

187

Nuclear symmetry energy from the Fermi-energy difference in nuclei  

E-Print Network (OSTI)

The neutron-proton Fermi-energy difference and the correlation to nucleon separation energies for some magic nuclei are investigated with the Skyrme energy density functionals and nuclear masses, with which the nuclear symmetry energy at sub-saturation densities is constrained from 54 Skyrme parameter sets. The extracted nuclear symmetry energy at sub-saturation density of 0.11 fm$^{-3}$ is 26.2 $\\pm$ 1.0 MeV with 1.5 $\\sigma$ uncertainty. By further combining the neutron-skin thickness of 208Pb, ten Skyrme forces with slope parameter of 28energy around saturation densities.

Wang, Ning; Liu, Min

2013-01-01T23:59:59.000Z

188

Quantum lattice gas model of Fermi systems with relativistic energy relations  

E-Print Network (OSTI)

Presented are several example quantum computing representations of quantum systems with a relativistic energy relation. Basic unitary representations of free Dirac particles and BCS superconductivity are given. Then, these are combined into a novel unitary representation of a Fermi condensate superfluid. The modeling approach employs an operator splitting method that is an analytically closed-form product decomposition of the unitary evolution operator, applied in the high-energy limit. This allows the relativistic wave equations to be cast as unitary finite-difference equations. The split evolution operators (comprising separate kinetic and interaction energy evolution terms) serve as quantum lattice gas models useful for efficient quantum simulation.

Jeffrey Yepez

2013-07-12T23:59:59.000Z

189

Nuclear symmetry energy from the Fermi-energy difference in nuclei  

E-Print Network (OSTI)

The neutron-proton Fermi-energy difference and the correlation to nucleon separation energies for some magic nuclei are investigated with the Skyrme energy density functionals and nuclear masses, with which the nuclear symmetry energy at sub-saturation densities is constrained from 54 Skyrme parameter sets. The extracted nuclear symmetry energy at sub-saturation density of 0.11 fm$^{-3}$ is 26.2 $\\pm$ 1.0 MeV with 1.5 $\\sigma$ uncertainty. By further combining the neutron-skin thickness of 208Pb, ten Skyrme forces with slope parameter of 28energy around saturation densities.

Ning Wang; Li Ou; Min Liu

2013-03-15T23:59:59.000Z

190

ENRICO FERMI FAST REACTOR SPENT NUCLEAR FUEL CRITICALLY CALCULATIONS: INTACT MODE  

SciTech Connect

The purpose of this calculation is to perform intact mode and partially degraded mode criticality evaluations of the Department of Energy's (DOE) Enrico Fermi (EF) Spent Nuclear Fuel (SNF) co-disposed in a 5 Defense High-Level Waste (5-DHLW) Waste Package (WP) and emplaced in a Monitored Geologic Repository (MGR). The criticality evaluations estimate the values of the effective neutron multiplication factor, k{sub eff}, a measure of nuclear criticality potential, for the 5-DHLW/DOE SNF WP with intact or partially degraded internal configurations. These evaluations contribute to the WP design.

A.S. Mobasheran

1999-04-12T23:59:59.000Z

191

Ground-state properties of trapped Bose-Fermi mixtures: Role of exchange correlation  

Science Conference Proceedings (OSTI)

We introduce density-functional theory for inhomogeneous Bose-Fermi mixtures, derive the associated Kohn-Sham equations, and determine the exchange-correlation energy in local-density approximation. We solve numerically the Kohn-Sham system, and determine the boson and fermion density distributions and the ground-state energy of a trapped, dilute mixture beyond mean-field approximation. The importance of the corrections due to exchange correlation is discussed by a comparison with current experiments; in particular, we investigate the effect of the repulsive potential-energy contribution due to exchange correlation on the stability of the mixture against collapse.

Albus, Alexander P.; Wilkens, Martin [Institut fuer Physik, Universitaet Potsdam, D-14469 Potsdam, (Germany); Illuminati, Fabrizio [Dipartimento di Fisica, Universita di Salerno, and Istituto Nazionale per la Fisica della Materia, I-84081 Baronissi (Saudi Arabia), (Italy)

2003-06-01T23:59:59.000Z

192

U.S. Department of Energy Awards Contract for Management and Operation of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Contract for Management and Contract for Management and Operation of Fermi National Accelerator Laboratory to the Fermi Research Alliance, LLC U.S. Department of Energy Awards Contract for Management and Operation of Fermi National Accelerator Laboratory to the Fermi Research Alliance, LLC November 1, 2006 - 9:25am Addthis BATAVIA, ILLINOIS -- The U.S. Department of Energy (DOE) has awarded a new $1.575 billion, five-year contract for management and operation of Fermi National Accelerator Laboratory (FNAL) to the Fermi Research Alliance, LLC (FRA), owned jointly by the University of Chicago (UChicago) and Universities Research Association, Inc. (URA). "The quality of the new contract is a direct consequence of the competition process," DOE Under Secretary for Science Dr. Raymond L. Orbach said today

193

Sound waves and dynamics of superfluid Fermi gases in optical lattices  

SciTech Connect

The sound waves, the stability of Bloch waves, the Bloch oscillation, and the self-trapping phenomenon in interacting two-component Fermi gases throughout the BEC-BCS crossover in one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) optical lattices are discussed in detail. Within the hydrodynamical theory and by using the perturbative and tight-binding approximation, sound speed in both weak and tight 1D, 2D, 3D optical lattices, and the criteria for occurrences of instability of Bloch waves and self-trapping of Fermi gases along the whole BEC-BCS crossover in tight 1D, 2D, 3D optical lattices are obtained analytically. The results show that the sound speed, the criteria for occurrences of instability of Bloch waves and self-trapping, and the destruction of Bloch oscillation are modified dramatically by the lattice parameters (lattice dimension and lattice strength), the atom density or atom number, and the atom interaction.

Zhang Aixia; Xue Jukui [Physics and Electronics Engineering College, Northwest Normal University, Lanzhou 730070 (China)

2009-10-15T23:59:59.000Z

194

Quantum-statistics-induced flow patterns in driven ideal Fermi gases  

E-Print Network (OSTI)

While classical or quantum interacting liquids become turbulent under sufficiently strong driving, it is not obvious what flow pattern an ideal quantum gas develops under similar conditions. Unlike classical noninteracting particles which exhibit rather trivial flow, ideal fermions have to satisfy the exclusion principle, which acts as a form of collective repulsion. We thus study the flow of an ideal Fermi gas as it is driven out of a narrow orifice of width comparable to the Fermi wavelength, employing both a microcanonical approach to transport, and solving a Lindblad equation for Markovian driving leads. Both methods are in good agreement and predict an outflowing current density with a complex microscopic pattern of vorticity in the steady state. Applying a bias of the order of the chemical potential results in a short-range correlated antiferromagnetic vorticity pattern, corresponding to local moments of the order of a tenth of a magneton, $e\\hbar/2m$, if the fermions are charged. The latter may be detectable by magnetosensitive spectroscopy in strongly driven cold gases (atoms) or clean electronic nanostructures (electrons).

Marco Beria; Yasir Iqbal; Massimiliano Di Ventra; Markus Müller

2013-06-03T23:59:59.000Z

195

A METHOD FOR LOCALIZING ENERGY DISSIPATION IN BLAZARS USING FERMI VARIABILITY  

SciTech Connect

The distance of a Fermi-detected blazar {gamma}-ray emission site from a supermassive black hole is a matter of active debate. Here we present a method for testing if the GeV emission of powerful blazars is produced within the subparsec-scale broad-line region (BLR) or farther out in the parsec-scale molecular torus (MT) environment. If the GeV emission takes place within the BLR, the inverse Compton (IC) scattering of the BLR ultraviolet (UV) seed photons that produces the {gamma}-rays takes place at the onset of the Klein-Nishina regime. This causes the electron cooling time to become practically energy-independent and the variation of the {gamma}-ray emission to be almost achromatic. If, on the other hand, the {gamma}-ray emission is produced farther out in the parsec-scale MT, the IC scattering of the infrared (IR) MT seed photons that produces the {gamma}-rays takes place in the Thomson regime, resulting in energy-dependent electron cooling times, manifested as faster cooling times for higher Fermi energies. We demonstrate these characteristics and discuss the applicability and limitations of our method.

Dotson, Amanda; Georganopoulos, Markos [Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 (United States); Kazanas, Demosthenes [NASA Goddard Space Flight Center, Code 660, Greenbelt, MD 20771 (United States); Perlman, Eric S., E-mail: adot1@umbc.edu [Department of Physics and Space Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901 (United States)

2012-10-10T23:59:59.000Z

196

SENSITIVITY OF BLIND PULSAR SEARCHES WITH THE FERMI LARGE AREA TELESCOPE  

SciTech Connect

We quantitatively establish the sensitivity to the detection of young to middle-aged, isolated, gamma-ray pulsars through blind searches of Fermi Large Area Telescope (LAT) data using a Monte Carlo simulation. We detail a sensitivity study of the time-differencing blind search code used to discover gamma-ray pulsars in the first year of observations. We simulate 10,000 pulsars across a broad parameter space and distribute them across the sky. We replicate the analysis in the Fermi LAT First Source Catalog to localize the sources, and the blind search analysis to find the pulsars. We analyze the results and discuss the effect of positional error and spin frequency on gamma-ray pulsar detections. Finally, we construct a formula to determine the sensitivity of the blind search and present a sensitivity map assuming a standard set of pulsar parameters. The results of this study can be applied to population studies and are useful in characterizing unidentified LAT sources.

Dormody, M.; Johnson, R. P.; Atwood, W. B.; Belfiore, A.; Razzano, M.; Saz Parkinson, P. M. [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States); Grenier, I. A. [Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, F-91191 Gif sur Yvette (France); Johnson, T. J., E-mail: dormody@scipp.ucsc.edu [National Academy of Sciences, Washington, DC 20001 (United States)

2011-12-01T23:59:59.000Z

197

Coordinate-Space Hartree-Fock-Bogoliubov Solvers for Superfluid Fermi Systems in Large Boxes  

SciTech Connect

The self-consistent Hartree-Fock-Bogoliubov problem in large boxes can be solved accurately in the coordinate space with the recently developed solvers HFB-AX (2D) and MADNESS-HFB (3D). This is essential for the description of superfluid Fermi systems with complicated topologies and significant spatial extend, such as fissioning nuclei, weakly-bound nuclei, nuclear matter in the neutron star rust, and ultracold Fermi atoms in elongated traps. The HFB-AX solver based on B-spline techniques uses a hybrid MPI and OpenMP programming model for parallel computation for distributed parallel computation, within a node multi-threaded LAPACK and BLAS libraries are used to further enable parallel calculations of large eigensystems. The MADNESS-HFB solver uses a novel multi-resolution analysis based adaptive pseudo-spectral techniques to enable fully parallel 3D calculations of very large systems. In this work we present benchmark results for HFB-AX and MADNESS-HFB on ultracold trapped fermions.

Pei, J. C. [University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL); Fann, George I [ORNL; Harrison, Robert J [ORNL; Nazarewicz, W. [University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL); Hill, Judith C [ORNL; Galindo, Diego A [ORNL; Jia, Jun [ORNL

2012-01-01T23:59:59.000Z

198

EVIDENCE FOR INDIRECT DETECTION OF DARK MATTER FROM GALAXY CLUSTERS IN FERMI {gamma}-RAY DATA  

SciTech Connect

Using the Fermi Large Area Telescope (LAT) we search for spectral features in {gamma}-rays coming from regions corresponding to the 18 brightest nearby galaxy clusters determined by the magnitude of their signal line-of-sight integrals. We observe a double-peak-like excess over the diffuse power-law background at photon energies of 110 GeV and 130 GeV with a global statistical significance of up to 3.6{sigma}, independently confirming earlier claims of the same excess from the Galactic center. Interpreting this result as a signal of dark matter annihilations to two monochromatic photon channels in galaxy cluster halos, and fixing the annihilation cross-section from the Galactic center data, we determine the annihilation boost factor due to dark matter subhalos from the data. Our results contribute to a discrimination of the dark matter annihilations from astrophysical processes and from systematic detector effects, offering them as possible explanations for the Fermi-LAT excess.

Hektor, A.; Raidal, M.; Tempel, E., E-mail: andi.hektor@cern.ch, E-mail: martti.raidal@cern.ch, E-mail: elmo@aai.ee [National Institute of Chemical Physics and Biophysics, Raevala 10, 10143 Tallinn(Estonia)

2013-01-10T23:59:59.000Z

199

Search for Large Extra Dimensions Based on Observations of Neutron Stars with the Fermi-LAT  

SciTech Connect

Large extra dimensions (LED) have been proposed to account for the apparent weakness of gravitation. These theories also indicate that the postulated massive Kaluza-Klein (KK) gravitons may be produced by nucleon-nucleon bremsstrahlung in the course of core collapse of supernovae. Hannestad and Raffelt have predicted energy spectra of gamma ray emission from the decay of KK gravitons trapped by the gravity of the remnant neutron stars (NS). These and other authors have used EGRET data on NS to obtain stringent limits on LED. Fermi-LAT is observing radio pulsar positions obtained from radio and x-ray catalogs. NS with certain characteristics are unlikely emitter of gamma rays, and emit in radio and perhaps x-rays. This talk will focus on the blind analysis we plan to perform, which has been developed using the 1st 2 months of all sky data and Monte Carlo simulations, to obtain limits on LED based on about 1 year of Fermi-LAT data. Preliminary limits from this analysis using these first 2 months of data will be also be discussed.

Berenji, Bijan; /Stanford U., Appl. Phys. Dept. /SLAC

2012-09-19T23:59:59.000Z

200

Tuning p-Wave Interactions in an Ultracold Fermi Gas of Atoms C. A. Regal, C. Ticknor, J. L. Bohn, and D. S. Jin*  

E-Print Network (OSTI)

Tuning p-Wave Interactions in an Ultracold Fermi Gas of Atoms C. A. Regal, C. Ticknor, J. L. Bohn have measured a p-wave Feshbach resonance in a single-component, ultracold Fermi gas of 40K atoms. We temperature regime accessible in atomic physics is characterized by collision energies so low that centrifugal

Jin, Deborah

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Superfluid Transition in a Rotating Fermi Gas with Resonant Interactions Martin Y. Veillette, Daniel E. Sheehy, Leo Radzihovsky, and Victor Gurarie  

E-Print Network (OSTI)

Superfluid Transition in a Rotating Fermi Gas with Resonant Interactions Martin Y. Veillette atomic Fermi gas near a narrow s-wave Feshbach resonance in a uniaxial trap with frequencies ?, z. We, the centrifugal force, the trap potential, the fixed number of atoms, and the tunable resonant pairing interaction

Baltisberger, Jay H.

202

Presidential Early Career Awards for Scientists and Engineers (PECASE) |  

Office of Science (SC) Website

Presidential Early Presidential Early Career Awards for Scientists and Engineers (PECASE) About Organization Budget Field Offices Federal Advisory Committees History Scientific and Technical Information Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) DOE's Winners Since 1996 Ceremony The Enrico Fermi Award The Ernest Orlando Lawrence Award DOE Nobel Laureates Federal Laboratory Consortium Excellence in Technology Transfer Award R&D 100 Awards Jobs Brochures, Logos, & Information Resources Contact Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) Print Text Size: A A A RSS Feeds

203

The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission  

SciTech Connect

The Large Area Telescope (Fermi/LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view (FoV), high-energy {gamma}-ray telescope, covering the energy range from below 20 MeV to more than 300 GeV. The LAT was built by an international collaboration with contributions from space agencies, high-energy particle physics institutes, and universities in France, Italy, Japan, Sweden, and the United States. This paper describes the LAT, its preflight expected performance, and summarizes the key science objectives that will be addressed. On-orbit performance will be presented in detail in a subsequent paper. The LAT is a pair-conversion telescope with a precision tracker and calorimeter, each consisting of a 4 x 4 array of 16 modules, a segmented anticoincidence detector that covers the tracker array, and a programmable trigger and data acquisition system. Each tracker module has a vertical stack of 18 (x, y) tracking planes, including two layers (x and y) of single-sided silicon strip detectors and high-Z converter material (tungsten) per tray. Every calorimeter module has 96 CsI(Tl) crystals, arranged in an eight-layer hodoscopic configuration with a total depth of 8.6 radiation lengths, giving both longitudinal and transverse information about the energy deposition pattern. The calorimeter's depth and segmentation enable the high-energy reach of the LAT and contribute significantly to background rejection. The aspect ratio of the tracker (height/width) is 0.4, allowing a large FoV (2.4 sr) and ensuring that most pair-conversion showers initiated in the tracker will pass into the calorimeter for energy measurement. Data obtained with the LAT are intended to (1) permit rapid notification of high-energy {gamma}-ray bursts and transients and facilitate monitoring of variable sources, (2) yield an extensive catalog of several thousand high-energy sources obtained from an all-sky survey, (3) measure spectra from 20 MeV to more than 50 GeV for several hundred sources, (4) localize point sources to 0.3-2 arcmin, (5) map and obtain spectra of extended sources such as SNRs, molecular clouds, and nearby galaxies, (6) measure the diffuse isotropic {gamma}-ray background up to TeV energies, and (7) explore the discovery space for dark matter.

Atwood, W.B.; /UC, Santa Cruz; Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Anderson, B. /UC, Santa Cruz; Axelsson, M.; /Stockholm U.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Band, D.L.; /NASA, Goddard /NASA, Goddard; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bartelt, J.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bastieri, Denis; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bederede, D.; /DAPNIA, Saclay; Bellardi, F.; /INFN, Pisa; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bignami, G.F.; /Pavia U.; Bisello, D.; /INFN, Padua /Padua U.; Bissaldi, E.; /Garching, Max Planck Inst., MPE; Blandford, R.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Pisa /INFN, Pisa /Bari U. /INFN, Bari /Ecole Polytechnique /Washington U., Seattle /INFN, Padua /Padua U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /IASF, Milan /Kalmar U. /Royal Inst. Tech., Stockholm /DAPNIA, Saclay /ASI, Rome /INFN, Pisa /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /George Mason U. /Naval Research Lab, Wash., D.C. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /DAPNIA, Saclay /NASA, Goddard /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; /more authors..

2009-05-15T23:59:59.000Z

204

79Fermi Observatory Measures the Lumps in Space An artistic impression of two gamma-ray photons  

E-Print Network (OSTI)

explored to date. As the gamma-rays travel through space, the shortest-wavelength gamma-rays take? Problem 3 ­ The Fermi Telescope measured a gamma-ray pulse from a distant object located 10 billion light from a distant object located 10 billion light years from Earth. The time delay was no more than 0

205

Fermi Limit on the Neutrino Flux from Gamma-ray Bursts  

E-Print Network (OSTI)

If gamma-ray bursts (GRBs) produce high energy cosmic rays, neutrinos are expected to be generated in GRBs due to photo-pion productions. However we stress that the same process also generates electromagnetic (EM) emission induced by the production of secondary electrons and photons, and that the EM emission is expected to be correlated to the neutrino flux. Using the Fermi/LAT observational results on gamma-ray flux from GRBs, the GRB neutrino emission is limited to be below ~20 GeV/m^2 per GRB event on average, which is independent of the unknown GRB proton luminosity. This neutrino limit suggests that the full IceCube needs stacking more than 130 GRBs in order to detect one GRB muon neutrino.

Zhuo Li

2012-10-24T23:59:59.000Z

206

Neutron Physics A Revision of I. Halpern's Notes on E. Fermi's Lectures in 1945  

NLE Websites -- All DOE Office Websites (Extended Search)

'.. '.. iJNCLASSIFIED . UNITED x STATES ATOMIC ENERGY COMMISSION . 1 I~, ., AECD-2664 ,# NEUTRON PHYSICS A Revision of I. Halpern's Notes on E. Fermi's Lectures in 1945 BY J. G. Beckerley October 16, 1951 [TIS Issuance Date] Atomic Energy Commission New York Operations :L : 't to TIC ;iiiii *=c; Technical Information Service, Oak Ridge, Tennessee . _ .._ U,NCLASSlFIEB DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that

207

Fermi National Accelerator Laboratory FERMILAB-Conf-94/419-E  

NLE Websites -- All DOE Office Websites (Extended Search)

Laboratory Laboratory FERMILAB-Conf-94/419-E CDF The Top.. . is it There? A Survey of the CDF and DO Experiments A.V. Tollestrup Fermi National Accelerator Laboratory P.O. Box 500, Batauia, Illinois 60510 December 1994 Published Proceedings Frontiers in Particle Physics, Cargese 94, Institu D'Etudes Scientifiques de Cargese, Cargese, Corsica, August l-13, 1994 e Operated by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with Uw United States DepMnent of Energy Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information,

208

The On-Orbit Calibrations for the Fermi Large Area Telescope  

SciTech Connect

The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope began its on-orbit operations on June 23, 2008. Calibrations, defined in a generic sense, correspond to synchronization of trigger signals, optimization of delays for latching data, determination of detector thresholds, gains and responses, evaluation of the perimeter of the South Atlantic Anomaly (SAA), measurements of live time, of absolute time, and internal and spacecraft boresight alignments. Here we describe on-orbit calibration results obtained using known astrophysical sources, galactic cosmic rays, and charge injection into the front-end electronics of each detector. Instrument response functions will be described in a separate publication. This paper demonstrates the stability of calibrations and describes minor changes observed since launch. These results have been used to calibrate the LAT datasets to be publicly released in August 2009.

Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ampe, J.; /Naval Research Lab, Wash., D.C.; Anderson, B.; /UC, Santa Cruz; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U., OKC /Stockholm U.; Bagagli, R.; /INFN, Pisa; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bartelt, J.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bastieri, Denis; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bederede, D.; /DAPNIA, Saclay; Bellardi, F.; /INFN, Pisa; Bellazzini, R.; /INFN, Pisa; Belli, F.; /Frascati /Rome U.,Tor Vergata; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bisello, D.; /INFN, Padua /Padua U. /Garching, Max Planck Inst., MPE /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Ecole Polytechnique /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /DAPNIA, Saclay /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Pisa /INFN, Pisa /Bari U. /INFN, Bari /Ecole Polytechnique /Washington U., Seattle /INFN, Padua /Padua U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /IASF, Milan /Kalmar U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /DAPNIA, Saclay /ASDC, Frascati /INFN, Pisa /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /George Mason U. /Naval Research Lab, Wash., D.C. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /DAPNIA, Saclay /NASA, Goddard /INFN, Perugia /Perugia U.; /more authors..

2011-11-17T23:59:59.000Z

209

Searching for Unmodeled Sources Using the Earth Occultation Data from the Fermi GBM  

E-Print Network (OSTI)

Employing the 12 NaI detectors in the Fermi GBM, the Earth Occultation Technique (EOT) can be used to measure the fluxes of x-ray and gamma-ray sources. Each time a source passes behind the Earth (or emerges from behind the Earth), a step-like feature is produced in the detector count rate. With a predefined catalog of source positions, the times of the occultation steps can be calculated, the individual steps fit, and the fluxes derived. However, in order to find new sources and generate a complete catalog, a method is needed for generating an image of the sky. An imaging algorithm has been developed to generate all-sky images using the GBM data. Here we present imaging results from ~2.5 years of data in the 12-25 keV and 100-300 keV energy bands.

Rodi, James; Cherry, Michael L; Camero-Arranz, Ascension; Finger, Mark H; Jenke, Peter; Wilson-Hodge, Colleen A; Chaplin, Vandiver

2011-01-01T23:59:59.000Z

210

Liquid-gas phase transition in nuclei in the relativistic Thomas-Fermi theory  

E-Print Network (OSTI)

The equation of state (EOS) of finite nuclei is constructed in the relativistic Thomas-Fermi theory using the non-linear $\\sigma-\\omega -\\rho$ model. The caloric curves are calculated by confining the nuclei in the freeze-out volume taken to be a sphere of size about 4 to 8 times the normal nuclear volume. The results obtained from the relativistic theory are not significantly different from those obtained earlier in a non-relativistic framework. The nature of the EOS and the peaked structure of the specific heat $C_v$ obtained from the caloric curves show clear signals of a liquid-gas phase transition in finite nuclei. The temperature evolution of the Gibbs potential and the entropy at constant pressure indicate that the characteristics of the transition are not too different from the first-order one.

Tapas Sil; B. K. Agrawal; J. N. De; S. K. Samaddar

2000-12-16T23:59:59.000Z

211

On the phenomenological classification of continuum radio spectra variability patterns of Fermi blazars  

E-Print Network (OSTI)

The F-GAMMA program is a coordinated effort to investigate the physics of Active Galactic Nuclei (AGNs) via multi-frequency monitoring of {\\em Fermi} blazars. The current study is concerned with the broad-band radio spectra composed of measurement at ten frequencies between 2.64 and 142 GHz. It is shown that any of the 78 sources studied can be classified in terms of their variability characteristics in merely 5 types of variability. The first four types are dominated by spectral evolution and can be reproduced by a simple two-component system made of the quiescent spectrum of a large scale jet populated with a flaring event evolving according to Marscher & Gear (1985). The last type is characterized by an achromatic change of the broad-band spectrum which must be attributed to a completely different mechanism. Here are presented, the classification, the assumed physical system and the results of simulations that have been conducted.

Angelakis, E; Nestoras, I; Fromm, C M; Schmidt, R; Zensus, J A; Marchili, N; Krichbaum, T P; Perucho-Pla, M; Ungerechts, H; Sievers, A; Riquelme, D

2011-01-01T23:59:59.000Z

212

Population Synthesis of Radio and Gamma-ray Pulsars in the Fermi Era  

E-Print Network (OSTI)

We present results of our pulsar population synthesis of normal pulsars from the Galactic disk using our previously developed computer code. On the same footing, we use slot gap and outer gap models for gamma-ray emission from normal pulsars to obtain statistics of radio-loud and radio-quiet gamma-ray pulsars. From recently improved understanding of HII and star forming regions in the Galaxy, we develop a new surface density model of the birth location of neutron stars. We explore models of neutron star evolution with magnetic field-decay, and with different initial period and magnetic field distributions. We present preliminary results including simulated population statistics that are compared with recent detections by Fermi of normal, isolated pulsars.

Gonthier, Peter L; Harding, Alice K; Grenier, Isabelle A; Pierbattista, Marco

2011-01-01T23:59:59.000Z

213

FERMI LIMIT ON THE NEUTRINO FLUX FROM GAMMA-RAY BURSTS  

SciTech Connect

If gamma-ray bursts (GRBs) produce high-energy cosmic rays, neutrinos are expected to be generated in GRBs via photo-pion productions. However, we stress that the same process also generates electromagnetic (EM) emission induced by the secondary electrons and photons, and that the EM emission is expected to be correlated with neutrino flux. Using Fermi/Large Area Telescope results on gamma-ray flux from GRBs, the GRB neutrino emission is limited to be <20 GeV m{sup -2} per GRB event on average, which is independent of the unknown GRB proton luminosity. This neutrino limit suggests that IceCube, operating at full scale, requires stacking of more than 130 GRBs in order to detect one GRB muon neutrino.

Li Zhuo [Department of Astronomy and Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing (China); Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming (China)

2013-06-20T23:59:59.000Z

214

Enrico Fermi Fast Reactor Spent Nuclear Fuel Criticality Calculations: Degraded Mode  

SciTech Connect

The objective of this calculation is to characterize the nuclear criticality safety concerns associated with the codisposal of the Department of Energy's (DOE) Enrico Fermi (EF) Spent Nuclear Fuel (SNF) in a 5-Defense High-Level Waste (5-DHLW) Waste Package (WP) and placed in a Monitored Geologic Repository (MGR). The scope of this calculation is limited to the determination of the effective neutron multiplication factor (k{sub eff}) for the degraded mode internal configurations of the codisposal WP. The results of this calculation and those of Ref. 8 will be used to evaluate criticality issues and support the analysis that will be performed to demonstrate the viability of the codisposal concept for the Monitored Geologic Repository.

D.R. Moscalu; L. Angers; J. Monroe-Rammsey; H.R. Radulesca

2000-07-21T23:59:59.000Z

215

Fermi Surface Evolution Across Multiple Charge Density Wave Transitions in ErTe3  

Science Conference Proceedings (OSTI)

The Fermi surface (FS) of ErTe{sub 3} is investigated using angle-resolved photoemission spectroscopy (ARPES). Low temperature measurements reveal two incommensurate charge density wave (CDW) gaps created by perpendicular FS nesting vectors. A large {Delta}{sub 1} = 175 meV gap arising from a CDW with c* - q{sub CDW1} {approx} 0.70(0)c* is in good agreement with the expected value. A second, smaller {Delta}{sub 2} = 50 meV gap is due to a second CDW with a* - q{sub CDW2} {approx} 0.68(5)a*. The temperature dependence of the FS, the two gaps and possible interaction between the CDWs are examined.

Moore, R.G.; /SLAC, SSRL /Stanford U., Geballe Lab.; Brouet, V.; /Orsay, LPS; He, R.; /SLAC, SSRL /Stanford U., Geballe Lab.; Lu, D.H.; /SLAC, SSRL; Ru, N.; Chu, J.-H.; Fisher, I.R.; /Stanford U., Geballe Lab.; Shen, Z.-X.; /SLAC, SSRL /Stanford U., Geballe Lab.

2010-02-15T23:59:59.000Z

216

Fermi Large Area Telescope Observations of the Cosmic-Ray Induced  

SciTech Connect

We report on measurements of the cosmic-ray induced {gamma}-ray emission of Earth's atmosphere by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. The LAT has observed the Earth during its commissioning phase and with a dedicated Earth-limb following observation in September 2008. These measurements yielded {approx} 6.4 x 10{sup 6} photons with energies > 100 MeV and {approx} 250 hours total livetime for the highest quality data selection. This allows the study of the spatial and spectral distributions of these photons with unprecedented detail. The spectrum of the emission - often referred to as Earth albedo gamma-ray emission - has a power-law shape up to 500 GeV with spectral index {Lambda} = 2.79 {+-} 0.06.

Abdo, A.

2012-02-29T23:59:59.000Z

217

Doping-Dependent Nodal Fermi Velocity in Bi-2212 Revealed by High-Resolution ARPES  

Science Conference Proceedings (OSTI)

The improved resolution of laser-based angle-resolved photoemission spectroscopy (ARPES) allows reliable access to fine structures in the spectrum. We present a systematic, doping-dependent study of a recently discovered low-energy kink in the nodal dispersion of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi-2212), which demonstrates the ubiquity and robustness of this kink in underdoped Bi-2212. The renormalization of the nodal velocity due to this kink becomes stronger with underdoping, revealing that the nodal Fermi velocity is non-universal, in contrast to assumed phenomenology. This is used together with laser-ARPES measurements of the gap velocity, v{sub 2}, to resolve discrepancies with thermal conductivity measurements.

Vishik, I. M.

2011-08-19T23:59:59.000Z

218

Production of cold fragments in nucleus-nucleus collisions in the Fermi-energy domain  

E-Print Network (OSTI)

The reaction mechanism of nucleus-nucleus collisions at projectile energies around the Fermi energy is investigated with emphasis on the production of fragmentation-like residues. The results of simulations are compared to experimental mass distributions of elements with Z = 21 - 29 observed in the reactions 86Kr+124,112Sn at 25 AMeV. The model of incomplete fusion is modified and a component of excitation energy of the cold fragment dependent on isospin asymmetry is introduced. The modifications in the model of incomplete fusion appear consistent with both overall model framework and available experimental data. A prediction is provided for the production of very neutron-rich nuclei using a secondary beam of 132Sn where e.g. the reaction 132Sn+238U at 28 AMeV appears as a possible alternative to the use of fragmentation reactions at higher energies.

Veselsky, M

2007-01-01T23:59:59.000Z

219

Production of cold fragments in nucleus-nucleus collisions in the Fermi-energy domain  

E-Print Network (OSTI)

The reaction mechanism of nucleus-nucleus collisions at projectile energies around the Fermi energy is investigated with emphasis on the production of fragmentation-like residues. The results of simulations are compared to experimental mass distributions of elements with Z = 21 - 29 observed in the reactions 86Kr+124,112Sn at 25 AMeV. The model of incomplete fusion is modified and a component of excitation energy of the cold fragment dependent on isospin asymmetry is introduced. The modifications in the model of incomplete fusion appear consistent with both overall model framework and available experimental data. A prediction is provided for the production of very neutron-rich nuclei using a secondary beam of 132Sn where e.g. the reaction 132Sn+238U at 28 AMeV appears as a possible alternative to the use of fragmentation reactions at higher energies.

M. Veselsky; G. A. Souliotis

2006-07-17T23:59:59.000Z

220

Fundamental physics in space with the Fermi Gamma-ray Space Telescope  

E-Print Network (OSTI)

Successfully launched in June 2008, the Fermi Gamma-ray Space Telescope, formerly named GLAST, has been observing the high-energy gamma-ray sky with unprecedented sensitivity for more than two years, opening a new window on a wide variety of exotic astrophysical objects. This paper is a short overview of the main science highlights, aimed at non-specialists, with emphasis on those which are more directly connected with the study of fundamental physics---particularly the search for signals of new physics in the diffuse gamma-ray emission and in the cosmic radiation and the study of Gamma-Ray Burst as laboratories for testing possible violations of the Lorentz invariance.

Luca Baldini for the Fermi LAT Collaboration

2011-01-09T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Searching for Spurious Solar and Sky Lines in the Fermi-LAT Spectrum  

E-Print Network (OSTI)

We search for a unified instrumental explanation of the spectral features seen near $E_\\gamma=130$ GeV in photons collected by Fermi-LAT from the galactic center and from the Earth's limb. We report for the first time a similar feature in photons originating from the vicinity of the Sun, and examine the instrumental characteristics of this Solar feature. To test an instrumental hypothesis, we identify the range of photon incident angles where most of the peak photons are observed in these three spectral features. An examination of the spectrum of photons from the rest of the sky with this characteristic angular range reveals a hint of a spectral feature near $E_\\gamma=130$ GeV. These results cast further doubt on the dark-matter-annihilation interpretation of the galactic center peak.

Daniel Whiteson

2013-02-02T23:59:59.000Z

222

Tentative observation of a gamma-ray line at the Fermi LAT  

E-Print Network (OSTI)

Using 43 months of public gamma-ray data from the Fermi Large Area Telescope, we find in regions close to the Galactic center at energies of 130 GeV a 4.6 sigma excess that is not inconsistent with a gamma-ray line from dark matter annihilation. When taking into account the look-elsewhere effect, the significance of the observed signature is 3.2 sigma. If interpreted in terms of dark matter particles annihilating into a photon pair, the observations imply a partial annihilation cross-section of about 10^-27 cm^3s^-1 and a dark matter mass around 130 GeV. We review aspects of the statistical analysis and comment on possible instrumental indications.

Weniger, Christoph

2012-01-01T23:59:59.000Z

223

SWIFT X-RAY TELESCOPE MONITORING OF FERMI-LAT GAMMA-RAY SOURCES OF INTEREST  

Science Conference Proceedings (OSTI)

We describe a long-term Swift monitoring program of Fermi gamma-ray sources, particularly the 23 gamma-ray ''sources of interest''.We present a systematic analysis of the Swift X-Ray Telescope light curves and hardness ratios of these sources, and we calculate excess variability. We present data for the time interval of 2004 December 22 through 2012 August 31. We describe the analysis methods used to produce these data products, and we discuss the availability of these data in an online repository, which continues to grow from more data on these sources and from a growing list of additional sources. This database should be of use to the broad astronomical community for long-term studies of the variability of these objects and for inclusion in multiwavelength studies.

Stroh, Michael C.; Falcone, Abe D. [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

2013-08-15T23:59:59.000Z

224

Second sound and the superfluid fraction in a resonantly interacting Fermi gas  

E-Print Network (OSTI)

Superfluidity is a macroscopic quantum phenomenon, which shows up below a critical temperature and leads to a peculiar behavior of matter, with frictionless flow, the formation of quantized vortices, and the quenching of the moment of inertia being intriguing examples. A remarkable explanation for many phenomena exhibited by a superfluid at finite temperature can be given in terms of a two-fluid mixture comprised of a normal component that behaves like a usual fluid and a superfluid component with zero viscosity and zero entropy. Important examples of superfluid systems are liquid helium and neutron stars. More recently, ultracold atomic gases have emerged as new superfluid systems with unprecedented possibilities to control interactions and external confinement. Here we report the first observation of `second sound' in an ultracold Fermi gas with resonant interactions. Second sound is a striking manifestation of the two-component nature of a superfluid and corresponds to an entropy wave, where the superfluid...

Sidorenkov, Leonid A; Grimm, Rudolf; Hou, Yan-Hua; Pitaevskii, Lev; Stringari, Sandro

2013-01-01T23:59:59.000Z

225

CONSTRAINING THE HIGH-ENERGY EMISSION FROM GAMMA-RAY BURSTS WITH FERMI  

Science Conference Proceedings (OSTI)

We examine 288 gamma-ray bursts (GRBs) detected by the Fermi Gamma-ray Space Telescope's Gamma-ray Burst Monitor (GBM) that fell within the field of view of Fermi's Large Area Telescope (LAT) during the first 2.5 years of observations, which showed no evidence for emission above 100 MeV. We report the photon flux upper limits in the 0.1-10 GeV range during the prompt emission phase as well as for fixed 30 s and 100 s integrations starting from the trigger time for each burst. We compare these limits with the fluxes that would be expected from extrapolations of spectral fits presented in the first GBM spectral catalog and infer that roughly half of the GBM-detected bursts either require spectral breaks between the GBM and LAT energy bands or have intrinsically steeper spectra above the peak of the {nu}F{sub {nu}} spectra (E{sub pk}). In order to distinguish between these two scenarios, we perform joint GBM and LAT spectral fits to the 30 brightest GBM-detected bursts and find that a majority of these bursts are indeed softer above E{sub pk} than would be inferred from fitting the GBM data alone. Approximately 20% of this spectroscopic subsample show statistically significant evidence for a cutoff in their high-energy spectra, which if assumed to be due to {gamma}{gamma} attenuation, places limits on the maximum Lorentz factor associated with the relativistic outflow producing this emission. All of these latter bursts have maximum Lorentz factor estimates that are well below the minimum Lorentz factors calculated for LAT-detected GRBs, revealing a wide distribution in the bulk Lorentz factor of GRB outflows and indicating that LAT-detected bursts may represent the high end of this distribution.

Ackermann, M. [Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany); Ajello, M.; Bechtol, K.; Blandford, R. D.; Bloom, E. D.; Borgland, A. W.; Bottacini, E.; Buehler, R.; Cameron, R. A.; Charles, E. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Baldini, L.; Bellazzini, R. [Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy); Barbiellini, G. [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy); Baring, M. G. [Department of Physics and Astronomy, Rice University, MS-108, P.O. Box 1892, Houston, TX 77251 (United States); Bonamente, E.; Cecchi, C. [Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy); Bouvier, A. [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States); Brigida, M. [Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy); Buson, S. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy); Caliandro, G. A., E-mail: jchiang@slac.stanford.edu, E-mail: kocevski@slac.stanford.edu, E-mail: moretti@particle.kth.se, E-mail: connauv@uah.edu, E-mail: valerie@nasa.gov, E-mail: michael.briggs@nasa.gov [Institut de Ciencies de l'Espai (IEEE-CSIC), Campus UAB, E-08193 Barcelona (Spain); Collaboration: Fermi Large Area Telescope Team; Fermi Gamma-ray Burst Monitor Team; and others

2012-08-01T23:59:59.000Z

226

Limits on Large Extra Dimensions Based on Observations of Neutron Stars with the Fermi-LAT  

Science Conference Proceedings (OSTI)

We present limits for the compactification scale in the theory of Large Extra Dimensions (LED) proposed by Arkani-Hamed, Dimopoulos, and Dvali. We use 11 months of data from the Fermi Large Area Telescope (Fermi-LAT) to set gamma ray flux limits for 6 gamma-ray faint neutron stars (NS). To set limits on LED we use the model of Hannestad and Raffelt (HR) that calculates the Kaluza-Klein (KK) graviton production in supernova cores and the large fraction subsequently gravitationally bound around the resulting NS. The predicted decay of the bound KK gravitons to {gamma}{gamma} should contribute to the flux from NSs. Considering 2 to 7 extra dimensions of the same size in the context of the HR model, we use Monte Carlo techniques to calculate the expected differential flux of gamma-rays arising from these KK gravitons, including the effects of the age of the NS, graviton orbit, and absorption of gamma-rays in the magnetosphere of the NS. We compare our Monte Carlo-based differential flux to the experimental differential flux using maximum likelihood techniques to obtain our limits on LED. Our limits are more restrictive than past EGRET-based optimistic limits that do not include these important corrections. Additionally, our limits are more stringent than LHC based limits for 3 or fewer LED, and comparable for 4 LED. We conclude that if the effective Planck scale is around a TeV, then for 2 or 3 LED the compactification topology must be more complicated than a torus.

Ajello, M.; /SLAC /KIPAC, Menlo Park; Baldini, L.; /INFN, Pisa; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Bechtol, K.; /SLAC /KIPAC, Menlo Park; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /SLAC /KIPAC, Menlo Park; Bloom, E.D.; /SLAC /KIPAC, Menlo Park; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /SLAC /KIPAC, Menlo Park; Bregeon, J.; /INFN, Pisa; Brigida, M.; /Bari Polytechnic /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Buehler, R.; /SLAC /KIPAC, Menlo Park; Buson, S.; /INFN, Padua /Padua U.; Caliandro, G.A.; /CSIC, Catalunya; Cameron, R.A.; /SLAC /KIPAC, Menlo Park; Caraveo, P.A.; /Brera Observ.; Casandjian, J.M.; /AIM, Saclay; Cecchi, C.; /INFN, Perugia /Perugia U.; Charles, E.; /SLAC /KIPAC, Menlo Park /Naval Research Lab, Wash., D.C. /SLAC /KIPAC, Menlo Park /ASDC, Frascati /Perugia U. /SLAC /KIPAC, Menlo Park /Montpellier U. /Stockholm U. /Stockholm U., OKC /Royal Swedish Acad. Sci. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /SLAC /KIPAC, Menlo Park /SLAC /KIPAC, Menlo Park /SLAC /KIPAC, Menlo Park /SLAC /KIPAC, Menlo Park /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Hiroshima U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /Bari Polytechnic /INFN, Bari /Bologna Observ. /SLAC /KIPAC, Menlo Park /SLAC /KIPAC, Menlo Park /SLAC /KIPAC, Menlo Park /AIM, Saclay /Alabama U., Huntsville /INFN, Padua; /more authors..

2012-08-17T23:59:59.000Z

227

Running fermi with one-stage compressor: advantages, layout,performance  

Science Conference Proceedings (OSTI)

CBP-Tech Note-345 (July 2005), devoted to a study of microbunching instability in FERMI@ELETTRA linac quotes '...the above analysis shows that the most of the gain in microbunching instability occurs after BC2, i.e. after transformation of the energy modulation to the spatial modulation that takes place in BC2. It is possible to avoid that if we use only BC1 for all our needs for bunch compression. There are also additional advantages for a mitigation of the microbunching instability related to that. First, we would need to increase R56 in BC1 (for given energy chirp in the electron beam). Second, a relative energy spread is significantly larger at BC1 than at BC2. Both these factors would contribute to instability suppression due to increased Landau damping effect.' One additional argument was however missed in that report. Instability smearing due to finite emittance is stronger in BC1 simply because the geometrical emittance is larger than in BC2. In spite of the considerations in favor of a lattice with one-stage compressor, it was thought at the time that the two bunch compressors configuration was still preferable as it appeared difficult to obtain a flat-flat distribution at the end of the linac with only one bunch compressor. A flat-flat distribution has constant medium energy and a constant peak current along the electron bunch. Now, two years later and more studies behind, this problem is solvable. It has been demonstrated1 that shaping the intensity of the electron bunch at the injector using intensity modulation of the photocathode laser allows to use the linac structural wake fields to advantage to obtain a flat-flat distribution at the end of the linac in a two-stage compressor. This report shows that, using the back-tracking technique, it is possible to obtain a flat-flat distribution also in a single-stage compressor. Preliminary results of a study of the microbunching instability applied to the FERMI lattice with one-stage compressor are shown in this report . There is concern that the effect of jitter in accelerator parameters is more pronounced with one bunch compressor: the results of jitter studies are given and are compared with the case of a two-stage compressor.

Cornacchia, M.; Craievich, P.; Di Mitri, S.; Penco, G.; Venturini, M.; Zholents, A.

2007-05-25T23:59:59.000Z

228

Education Office / Fermi National Accelerator Laboratory U. S. Department of Energy's Office of Science / Managed by Universities Research Association, Inc.  

NLE Websites -- All DOE Office Websites (Extended Search)

Education Office / Fermi National Accelerator Laboratory Education Office / Fermi National Accelerator Laboratory U. S. Department of Energy's Office of Science / Managed by Universities Research Association, Inc. Kirk Road and Pine Street / M.S. 226 / P.O. Box 500 / Batavia, IL 60510 / 630.840.3092 / www-ed.fnal.gov Physics Workshop and Field Trip for Grades 6-9 Sampler Introduction "Beauty" and "Charm" are the fanciful names of two of six fundamental particles called quarks. Part of the experimental verification for the existence of quarks was carried out at Fermilab. However, this unit was titled Beauty and Charm at Fermilab with a second meaning in mind. Fermilab, as any visitor will attest, is a place of beauty-a high-rise main building with architec- ture inspired by a French cathedral and set on a prairie-like plain reminiscent of early Illinois. In

229

Fermi surface of SrFe2P2 determined by de Haas-van Alphen effect  

SciTech Connect

We report measurements of the Fermi surface (FS) of the ternary iron-phosphide SrFe{sub 2}P{sub 2} using the de Haas-van Alphen effect. The calculated FS of this compound is very similar to SrFe{sub 2}As{sub 2}, the parent compound of the high temperature superconductors. Our data show that the Fermi surface is composed of two electron and two hole sheets in agreement with bandstructure calculations. Several of the sheets show strong c-axis warping emphasizing the importance of three-dimensionality in the non-magnetic state of the ternary pnictides. We find that the electron and hole pockets have a different topology, implying that this material does not satisfy a ({pi},{pi}) nesting condition.

Analytis, J.G.

2010-05-26T23:59:59.000Z

230

Test of Fermi Gas Model and Plane-Wave Impulse Approximation Against Electron-Nucleus Scattering Data  

E-Print Network (OSTI)

A widely used relativistic Fermi gas model and plane-wave impulse approximation are tested against electron-nucleus scattering data. Inclusive quasi-elastic cross section are calculated and compared with high-precision data for C, O, and Ca. A dependence of agreement between calculated cross section and data on a momentum transfer is shown. Results for the C(nu_mu,mu) reaction are presented and compared with experimental data of the LSND collaboration.

A. V. Butkevich; S. P. Mikheyev

2005-04-30T23:59:59.000Z

231

Implications of the Fermi-LAT gamma ray observation on minimal $U(1)_{B-L}$ model  

E-Print Network (OSTI)

The recent observation of Fermi-LAT signal of monochromatic gamma ray has drawn much attention. One of the possible explanations for this observation can be due to the annihilation of the dark matter particles into two photons. In our article we adopt a $B-L$ extended Standard Model which contains a singlet scalar and three right-handed neutrinos. The vacuum expectation value of the singlet scalar breaks the $U(1)_{B-L}$ symmetry. We have imposed a $Z_2$ symmetry in such a way that the 3rd generation right-handed neutrino is qualified as the dark matter candidate. This right-handed neutrino, having mass 130 GeV, annihilates into two photons through a resonance channel via a heavy scalar. We constrain the scalar mixing angle, $\\cos\\alpha \\geq 0.986$ by demanding the desired cross-section $\\langle\\sigma v\\rangle_{\\gamma \\gamma}$ for the Fermi-line. We have also checked that this mixing angle allows vacuum stability of this model up to $10^5$ GeV. This might hints that this $U(1)_{B-L}$ extended model that can explain Fermi-LAT signal of monochromatic gamma ray line must be a part of larger symmetry group at some high scale.

Tanushree Basak; Tanmoy Mondal

2013-07-31T23:59:59.000Z

232

High-temperature thermodynamics of strongly interacting s-wave and p-wave Fermi gases in a harmonic trap  

SciTech Connect

We theoretically investigate the high-temperature thermodynamics of a strongly interacting trapped Fermi gas near either s-wave or p-wave Feshbach resonances, using a second-order quantum virial expansion. The second virial coefficient is calculated based on the energy spectrum of two interacting fermions in a harmonic trap. We consider both isotropic and anisotropic harmonic potentials. For the two-fermion interaction, either s-wave or p-wave, we use a pseudopotential parametrized by a scattering length and an effective range. This turns out to be the simplest way of encoding the energy dependence of the low-energy scattering amplitude or phase shift. This treatment of the pseudopotential can be easily generalized to higher partial-wave interactions. We discuss how the second virial coefficient and thermodynamics are affected by the existence of these finite-range interaction effects. The virial expansion result for a strongly interacting s-wave Fermi gas has already been proved very useful. In the case of p-wave interactions, our results for the high-temperature equation of state are applicable to future high-precision thermodynamic measurements for a spin-polarized Fermi gas near a p-wave Feshbach resonance.

Peng Shiguo [Department of Physics, Tsinghua University, Beijing, 100084 (China); Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia); Li Shiqun [Department of Physics, Tsinghua University, Beijing, 100084 (China); Drummond, Peter D.; Liu Xiaji [Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia)

2011-06-15T23:59:59.000Z

233

Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes  

SciTech Connect

The diffuse galactic {gamma}-ray emission is produced by cosmic rays (CRs) interacting with the interstellar gas and radiation field. Measurements by the Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on the Compton Gamma-Ray Observatory indicated excess {gamma}-ray emission {ge}1 GeV relative to diffuse galactic {gamma}-ray emission models consistent with directly measured CR spectra (the so-called 'EGRET GeV excess'). The Large Area Telescope (LAT) instrument on the Fermi Gamma-Ray Space Telescope has measured the diffuse {gamma}-ray emission with improved sensitivity and resolution compared to EGRET. We report on LAT measurements for energies 100 MeV to 10 GeV and galactic latitudes 10{sup o} {le} |b| {le} 20{sup o}. The LAT spectrum for this region of the sky is well reproduced by a diffuse galactic {gamma}-ray emission model that is consistent with local CR spectra and inconsistent with the EGRET GeV excess.

Abdo, A.A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; Ajello, M.; /SLAC; Anderson, B.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U. /Stockholm U., OKC; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Taiwan, Natl. Taiwan U. /Ohio State U.; Bechtol, K.; /SLAC; Bellazzini, R.; /INFN, Pisa; Berenji, B.; Blandford, R.D.; Bloom, E.D.; /SLAC; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /SLAC; Bregeon, J.; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari /Ecole Polytechnique /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /Stockholm U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /Padua U. /Naval Research Lab, Wash., D.C. /Udine U. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /INFN, Pisa /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /CENBG, Gradignan /CENBG, Gradignan /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /Bari U. /INFN, Bari /Ecole Polytechnique /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Hiroshima U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari U. /INFN, Bari /INFN, Pisa /INFN, Bari /NASA, Goddard /Maryland U.; /more authors..

2012-04-11T23:59:59.000Z

234

Phonon contribution to the shear viscosity of a superfluid Fermi gas in the unitarity limit  

E-Print Network (OSTI)

We present a detailed analysis of the contribution of small-angle Nambu-Goldstone boson (phonon) collisions to the shear viscosity, $\\eta$, in a superfluid atomic Fermi gas close to the unitarity limit. We show that the experimental values of the shear viscosity coefficient to entropy ratio, $\\eta/s$, obtained at the lowest reached temperature can be reproduced assuming that phonons give the leading contribution to $\\eta$. The phonon contribution is evaluated considering $1 \\leftrightarrow 2$ processes and taking into account the finite size of the experimental system. In particular, for very low temperatures, $T \\lesssim 0.1 T_F$, we find that phonons are ballistic and the contribution of phonons to the shear viscosity is determined by the processes that take place at the interface between the superfluid and the normal phase. This result is independent of the detailed form of the phonon dispersion law and leads to two testable predictions: the shear viscosity should correlate with the size of the optical trap and it should decrease with decreasing temperature. For higher temperatures the detailed form of the phonon dispersion law becomes relevant and, within our model, we find that the experimental data for $\\eta/s$ can be reproduced assuming that phonons have an anomalous dispersion law.

Massimo Mannarelli; Cristina Manuel; Laura Tolos

2012-12-20T23:59:59.000Z

235

Exponential Decay and Fermi's Golden Rule from an Uncontrolled Quantum Zeno Effect  

E-Print Network (OSTI)

The prediction of the Quantum Zeno Effect is based on a product of autocorrelation functions and on the evolution of these functions at short times. We show why in quantum mechanics the autocorrelation between a state and itself some time later cannot be a surrogate for the standard probability. We then reformulate the Quantum Zeno Effect based on the physically meaningful probability, and we find as a condition to observe an inhibition of decay that, following each measurement in a sequence, the system must be prepared in a common eigenstate of the same set of commuting observables. This leads to a simple model of spontaneous decay, in which an excited atom continuously interacts with and is monitored by an incoherent sum of radiation fields. Regardless of the system's evolution otherwise, while monitored the excited atom has exponentially decreasing survival probability at all times. We derive the decay rate and find Fermi's Golden Rule. Continuous monitoring may thus be a mechanism by which to explain the exponential decay law.

P. W. Bryant

2013-09-20T23:59:59.000Z

236

FERMI LAT PULSED DETECTION OF PSR J0737-3039A IN THE DOUBLE PULSAR SYSTEM  

SciTech Connect

We report the Fermi Large Area Telescope discovery of {gamma}-ray pulsations from the 22.7 ms pulsar A in the double pulsar system J0737-3039A/B. This is the first mildly recycled millisecond pulsar (MSP) detected in the GeV domain. The 2.7 s companion object PSR J0737-3039B is not detected in {gamma} rays. PSR J0737-3039A is a faint {gamma}-ray emitter, so that its spectral properties are only weakly constrained; however, its measured efficiency is typical of other MSPs. The two peaks of the {gamma}-ray light curve are separated by roughly half a rotation and are well offset from the radio and X-ray emission, suggesting that the GeV radiation originates in a distinct part of the magnetosphere from the other types of emission. From the modeling of the radio and the {gamma}-ray emission profiles and the analysis of radio polarization data, we constrain the magnetic inclination {alpha} and the viewing angle {zeta} to be close to 90 Degree-Sign , which is consistent with independent studies of the radio emission from PSR J0737-3039A. A small misalignment angle between the pulsar's spin axis and the system's orbital axis is therefore favored, supporting the hypothesis that pulsar B was formed in a nearly symmetric supernova explosion as has been discussed in the literature already.

Guillemot, L.; Kramer, M. [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany); Johnson, T. J. [National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001 (United States); Craig, H. A.; Romani, R. W.; Kerr, M. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Venter, C. [Centre for Space Research, North-West University, Potchefstroom Campus, Private Bag X6001, 2520 Potchefstroom (South Africa); Harding, A. K. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Ferdman, R. D. [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, M13 9PL (United Kingdom); Stairs, I. H., E-mail: guillemo@mpifr-bonn.mpg.de [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada)

2013-05-10T23:59:59.000Z

237

Quantum collapse in ground-state Fermi-Dirac-Landau plasmas  

SciTech Connect

In this paper, it is revealed that in a relativistically degenerate dense highly magnetized electron-ion plasma, the effective quantum-potential due to the quantum-force acting on fermions may vanish causing a quantum transverse collapse in the ground-state Fermi-Dirac-Landau (GSFDL) plasma. The condition for the plasma transverse collapse is found to be restricted to the minimum relativistic degeneracy parameter and minimum impressed magnetic field strength values satisfied for some superdense astrophysical objects such as white dwarfs and neutron stars. In such objects, the magnetization pressure is shown to cancel the lateral electron degeneracy pressure counteracting the existing gravitational pressure. Furthermore, using the Sagdeev pseudopotential method in the framework of quantum magnetohydrodynamics model, including magnetization, it is confirmed that the quantum pressure due to spin-orbit polarization and the electron relativistic degeneracy has crucial effects on the existence criteria and the propagation of localized magnetosonic density excitations in GSFDL plasmas. Current findings can have important implications for the density excitation mechanism and hydrostatic stability of the highly magnetized astrophysical relativistically dense objects such as white-dwarfs, neutron stars, magnetars, and pulsars.

Akbari-Moghanjoughi, M. [Department of Physics, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, 51745-406 Tabriz (Iran, Islamic Republic of)

2011-08-15T23:59:59.000Z

238

Reproducing neutrino effects on the matter power spectrum through a degenerate Fermi gas approach  

E-Print Network (OSTI)

Modifications on the predictions about the matter power spectrum based on the hypothesis of a tiny contribution from a degenerate Fermi gas (DFG) test-fluid to some dominant cosmological scenario are investigated. Reporting about the systematic way of accounting for all the cosmological perturbations, through the Boltzmann equation we obtain the analytical results for density fluctuation, $\\delta$, and fluid velocity divergence, $\\theta$, of the DFG. Small contributions to the matter power spectrum are analytically obtained for the radiation-dominated background, through an ultra-relativistic approximation, and for the matter-dominated and $\\Lambda$-dominated eras, through a non-relativistic approximation. The results can be numerically reproduced and compared with those of considering non-relativistic and ultra-relativistic neutrinos into the computation of the matter power spectrum. Lessons concerning the formation of large scale structures of a DFG are depicted, and consequent deviations from standard $\\Lambda$CDM predictions for the matter power spectrum (with and without neutrinos) are quantified.

E. L. D. Perico; Alex E. Bernardini

2011-02-19T23:59:59.000Z

239

Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM  

E-Print Network (OSTI)

The monitor of all-sky X-ray image (MAXI) Gas Slit Camera (GSC) on the International Space Station (ISS) detected a gamma-ray burst (GRB) on 2009, September 26, GRB\\,090926B. This GRB had extremely hard spectra in the X-ray energy range. Joint spectral fitting with the Gamma-ray Burst Monitor on the Fermi Gamma-ray Space Telescope shows that this burst has peculiarly narrow spectral energy distribution and is represented by Comptonized blackbody model. This spectrum can be interpreted as photospheric emission from the low baryon-load GRB fireball. Calculating the parameter of fireball, we found the size of the base of the flow $r_0 = (4.3 \\pm 0.9) \\times 10^{9} \\, Y^{\\prime \\, -3/2}$ cm and Lorentz factor of the plasma $\\Gamma = (110 \\pm 10) \\, Y^{\\prime \\, 1/4}$, where $Y^{\\prime}$ is a ratio between the total fireball energy and the energy in the blackbody component of the gamma-ray emission. This $r_0$ is factor of a few larger, and the Lorentz factor of 110 is smaller by also factor of a few than other bu...

Serino, Motoko; Kawai, Nobuyuki; Nakagawa, Yujin E; Ueda, Yoshihiro; Mihara, Tatehiro; Nakahira, Satoshi; Eguchi, Satoshi; Hiroi, Kazuo; Ishikawa, Masaki; Isobe, Naoki; Kimura, Masashi; Kitayama, Hiroki; Kohama, Mitsuhiro; Matsumura, Takanori; Matsuoka, Masaru; Morii, Mikio; Nakajima, Motoki; Negoro, Hitoshi; Shidatsu, Megumi; Sootome, Tetsuya; Sugimori, Kousuke; Sugizaki, Mutsumi; Suwa, Fumitoshi; Toizumi, Takahiro; Tomida, Hiroshi; Tsuboi, Yohko; Tsunemi, Hiroshi; Ueno, Shiro; Usui, Ryuichi; Yamamoto, Takayuki; Yamaoka, Kazutaka; Yamauchi, Makoto; Yamazaki, Kyohei

2011-01-01T23:59:59.000Z

240

Fermi Large Area Telescope Observations of the Cygnus Loop Supernova Remnant  

Science Conference Proceedings (OSTI)

We present an analysis of the gamma-ray measurements by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) Cygnus Loop (G74.0-8.5). We detect significant gamma-ray emission associated with the SNR in the energy band 0.2-100 GeV. The gamma-ray spectrum shows a break in the range 2-3 GeV. The gamma-ray luminosity is {approx} 1 x 10{sup 33} erg s{sup -1} between 1-100 GeV, much lower than those of other GeV-emitting SNRs. The morphology is best represented by a ring shape, with inner/outer radii 0{sup o}.7 {+-} 0{sup o}.1 and 1{sup o}.6 {+-} 0{sup o}.1. Given the association among X-ray rims, H{alpha} filaments and gamma-ray emission, we argue that gamma rays originate in interactions between particles accelerated in the SNR and interstellar gas or radiation fields adjacent to the shock regions. The decay of neutral pions produced in nucleon-nucleon interactions between accelerated hadrons and interstellar gas provides a reasonable explanation for the gamma-ray spectrum.

Katagiri, H.; /Ibaraki U., Mito; Tibaldo, L.; /INFN, Padua /Padua U. /Paris U., VI-VII; Ballet, J.; /Paris U., VI-VII; Giordano, F.; /Bari U. /Bari Polytechnic /INFN, Bari; Grenier, I.A.; /Paris U., VI-VII; Porter, T.A.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Roth, M.; /Washington U., Seattle; Tibolla, O.; /Wurzburg U.; Uchiyama, Y.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Yamazaki, R.; /Sagamihara, Aoyama Gakuin U.

2011-11-08T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

In-Flight Measurement of the Absolute Energy Scale of the Fermi Large Area Telescope  

Science Conference Proceedings (OSTI)

The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to survey the gamma-ray sky from 20 MeV to several hundreds of GeV. In this energy band there are no astronomical sources with sufficiently well known and sharp spectral features to allow an absolute calibration of the LAT energy scale. However, the geomagnetic cutoff in the cosmic ray electron-plus-positron (CRE) spectrum in low Earth orbit does provide such a spectral feature. The energy and spectral shape of this cutoff can be calculated with the aid of a numerical code tracing charged particles in the Earth's magnetic field. By comparing the cutoff value with that measured by the LAT in different geomagnetic positions, we have obtained several calibration points between {approx}6 and {approx}13 GeV with an estimated uncertainty of {approx}2%. An energy calibration with such high accuracy reduces the systematic uncertainty in LAT measurements of, for example, the spectral cutoff in the emission from gamma ray pulsars.

Ackermann, M.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Ajello, M.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Allafort, A.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm; Baldini, L.; /INFN, Pisa; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Bechtol, K.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Bloom, E.D.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Bouvier, A.; /UC, Santa Cruz; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari Polytechnic /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Buehler, R.; /Stanford U., HEPL /SLAC /KIPAC, Menlo Park; Buson, S.; /INFN, Padua /Padua U. /CSIC, Catalunya /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Unlisted, US /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /ASDC, Frascati /Perugia U. /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Montpellier U. /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Montpellier U. /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Ecole Polytechnique /Hiroshima U. /Stanford U., HEPL /SLAC /KIPAC, Menlo Park /Bari Polytechnic /INFN, Bari /INFN, Bari /NASA, Goddard /INFN, Perugia /Perugia U.; /more authors..

2012-09-20T23:59:59.000Z

242

Free fermion antibunching in a degenerate atomic Fermi gas released from an optical lattice  

E-Print Network (OSTI)

Noise in a quantum system is fundamentally governed by the statistics and the many-body state of the underlying particles. Whereas for bosonic particles the correlated noise observed for e.g. photons or bosonic neutral atoms can still be explained within a classical field description with fluctuating phases, the anticorrelations in the detection of fermionic particles have no classical analogue. The observation of such fermionic antibunching is so far scarce and has been confined to electrons and neutrons. Here we report on the first direct observation of antibunching of neutral fermionic atoms. Through an analysis of the atomic shot noise in a set of standard absorption images, of a gas of fermionic 40K atoms released from an optical lattice, we find reduced correlations for distances related to the original spacing of the trapped atoms. The detection of such quantum statistical correlations has allowed us to characterise the ordering and temperature of the Fermi gas in the lattice. Moreover, our findings are an important step towards revealing fundamental fermionic many-body quantum phases in periodic potentials, which are at the focus of current research.

T. Rom; Th. Best; D. van Oosten; U. Schneider; S. Foelling; B. Paredes; I. Bloch

2006-11-21T23:59:59.000Z

243

THE INTERPLANETARY NETWORK SUPPLEMENT TO THE FERMI GBM CATALOG OF COSMIC GAMMA-RAY BURSTS  

Science Conference Proceedings (OSTI)

We present Interplanetary Network (IPN) data for the gamma-ray bursts in the first Fermi Gamma-Ray Burst Monitor (GBM) catalog. Of the 491 bursts in that catalog, covering 2008 July 12 to 2010 July 11, 427 were observed by at least one other instrument in the nine-spacecraft IPN. Of the 427, the localizations of 149 could be improved by arrival time analysis (or {sup t}riangulation{sup )}. For any given burst observed by the GBM and one other distant spacecraft, triangulation gives an annulus of possible arrival directions whose half-width varies between about 0.'4 and 32 Degree-Sign , depending on the intensity, time history, and arrival direction of the burst, as well as the distance between the spacecraft. We find that the IPN localizations intersect the 1{sigma} GBM error circles in only 52% of the cases, if no systematic uncertainty is assumed for the latter. If a 6 Degree-Sign systematic uncertainty is assumed and added in quadrature, the two localization samples agree about 87% of the time, as would be expected. If we then multiply the resulting error radii by a factor of three, the two samples agree in slightly over 98% of the cases, providing a good estimate of the GBM 3{sigma} error radius. The IPN 3{sigma} error boxes have areas between about 1 arcmin{sup 2} and 110 deg{sup 2}, and are, on the average, a factor of 180 smaller than the corresponding GBM localizations. We identify two bursts in the IPN/GBM sample that did not appear in the GBM catalog. In one case, the GBM triggered on a terrestrial gamma flash, and in the other, its origin was given as ''uncertain''. We also discuss the sensitivity and calibration of the IPN.

Hurley, K. [University of California, Berkeley, Space Sciences Laboratory, 7 Gauss Way, Berkeley, CA 94720-7450 (United States); Pal'shin, V. D.; Aptekar, R. L.; Golenetskii, S. V.; Frederiks, D. D.; Mazets, E. P.; Svinkin, D. S. [Ioffe Physical Technical Institute, St. Petersburg 194021 (Russian Federation); Briggs, M. S.; Connaughton, V. [University of Alabama in Huntsville, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805 (United States); Meegan, C. [Universities Space Research Association, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805 (United States); Goldsten, J. [Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723 (United States); Boynton, W.; Fellows, C.; Harshman, K. [University of Arizona, Department of Planetary Sciences, Tucson, AZ 85721 (United States); Mitrofanov, I. G.; Golovin, D. V.; Kozyrev, A. S.; Litvak, M. L.; Sanin, A. B. [Space Research Institute, 84/32, Profsoyuznaya, Moscow 117997 (Russian Federation); Rau, A., E-mail: khurley@ssl.berkeley.edu [Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85748 Garching (Germany); and others

2013-08-15T23:59:59.000Z

244

Fermi-LAT and Suzaku Observations of the Radio Galaxy Centaurus B  

SciTech Connect

CentaurusB is a nearby radio galaxy positioned in the Southern hemisphere close to the Galactic plane. Here we present a detailed analysis of about 43 months accumulation of Fermi-LAT data and of newly acquired Suzaku X-ray data for Centaurus B. The source is detected at GeV photon energies, although we cannot completely exclude the possibility that it is an artifact due to incorrect modeling of the bright Galactic diffuse emission in the region. The LAT image provides a weak hint of a spatial extension of the {gamma} rays along the radio lobes, which is consistent with the lack of source variability in the GeV range. We note that the extension cannot be established statistically due to the low number of the photons. Surprisingly, we do not detect any diffuse emission of the lobes at X-ray frequencies, with the provided upper limit only marginally consistent with the previously claimed ASCA flux. The broad-band modeling shows that the observed {gamma}-ray flux of the source may be produced within the lobes, if the diffuse non-thermal X-ray emission component is not significantly below the derived Suzaku upper limit. This association would imply that efficient in-situ acceleration of the ultrarelativistic particles is occurring and that the lobes are dominated by the pressure from the relativistic particles. However, if the diffuse X-ray emission is much below the Suzaku upper limits, the observed {gamma}-ray flux is not likely to be produced within the lobes, but instead within the unresolved core of Centaurus B. In this case, the extended lobes could be dominated by the pressure of the magnetic field.

Katsuta, Junichiro; /Stanford U., HEPL /KIPAC, Menlo Park; Tanaka, Y.T.; /Hiroshima U.; Stawarz, L.; /JAXA, Sagamihara /Jagiellonian U., Astron. Observ.; O'Sullivan, S.P.; /Australia, CSIRO, Epping; Cheung, C.C.; /NAS, Washington, D.C.; Kataoka, J.; /Waseda U., RISE; Funk, S.; /Stanford U., HEPL /KIPAC, Menlo Park; Yuasa, T.; Odaka, H.; Takahashi, T.; /JAXA, Sagamihara; Svoboda, J.; /European Space Agency

2012-08-17T23:59:59.000Z

245

The Search for High Energy Extended Emission by Fermi-LAT from Swift-Localized Gamma-Ray Bursts  

SciTech Connect

The brighter Fermi-LAT bursts have exhibited emission at energies >0.1 GeV that persists as late as {approx}2 ks after the prompt phase has nominally ended. This so-called 'extended emission' could arise from continued activity of the prompt burst mechanism or it could be the start of a high energy afterglow component. The high energy extended emission seen by the LAT has typically followed a t{sup -}{gamma} power-law temporal decay where {gamma} {approx} 1.2-1.7 and has shown no strong indication of spectral evolution. In contrast, the prompt burst emission generally displays strong spectral variability and more complex temporal changes in the LAT band. This differing behavior suggests that the extended emission likely corresponds to an early afterglow phase produced by an external shock. In this study, we look for evidence of high energy extended emission from 145 Swift-localized GRBs that have occurred since the launch of Fermi. A majority of these bursts were either outside of the LAT field-of-view or were otherwise not detected by the LAT during the prompt phase. However, because of the scanning operation of the Fermi satellite, the long-lived extended emission of these bursts may be detectable in the LAT data on the {approx}few ks time scale. We will look for emission from individual bursts and will perform a stacking analysis in order to set bounds on this emission for the sample as a whole. The detection of such emission would have implications for afterglow models and for the overall energy budget of GRBs.

Chiang, J.; /Stanford U., HEPL /SLAC; Racusin, J.L.; /NASA, Goddard

2012-05-01T23:59:59.000Z

246

Limits on the Time Variation of the Fermi Constant G_F Based on Type Ia Supernova Observations  

E-Print Network (OSTI)

The light curve of a type Ia supernova decays at a rate set by the beta-decay lifetimes of the Ni-56 and Co-56 produced in the explosion. This makes such a light curve sensitive to the value of the Fermi constant G_F at the time of the supernova. Using data from the CfA Supernova Archive, we measure the dependence of the light curve decay rate on redshift and place a bound on the time variation of G_F of |(dG_F/dt)/G_F| < 10^(-9) / y.

Ferrero, Alejandro

2010-01-01T23:59:59.000Z

247

Extracting the Chern number from the dynamics of a Fermi gas: Implementing a quantum Hall bar for cold atoms  

E-Print Network (OSTI)

We propose a scheme to measure the quantized Hall conductivity of an ultracold Fermi gas initially prepared in a topological (Chern) insulating phase, and driven by a constant force. We show that the time evolution of the center of mass, after releasing the cloud, provides a direct and clear signature of the topologically invariant Chern number. We discuss the validity of this scheme, highlighting the importance of driving the system with a sufficiently strong force to displace the cloud over measurable distances while avoiding band-mixing effects. The unusual shapes of the driven atomic cloud are qualitatively discussed in terms of a semi-classical approach.

Alexandre Dauphin; Nathan Goldman

2013-05-16T23:59:59.000Z

248

Comparison of 1D and 2D CSR Models with Application to the FERMI@ELETTRA Bunch Compressors  

SciTech Connect

We compare our 2D mean field (Vlasov-Maxwell) treatment of coherent synchrotron radiation (CSR) effects with 1D approximations of the CSR force which are commonly implemented in CSR codes. In our model we track particles in 4D phase space and calculate 2D forces [1]. The major cost in our calculation is the computation of the 2D force. To speed up the computation and improve 1D models we also investigate approximations to our exact 2D force. As an application, we present numerical results for the Fermi{at}Elettra first bunch compressor with the configuration described in [1].

Bassi, G.; Ellison, J.A.; Heinemann, K.

2011-03-28T23:59:59.000Z

249

BEC-BCS crossover and the mobility edge: superfluid-insulator transitions and reentrant superfluidity in disordered Fermi gases  

E-Print Network (OSTI)

A superfluid-insulator transition is known to occur in strongly disordered Fermi gases, in both the BCS and BEC regimes; here, we address the properties of this transition across the BEC-BCS crossover. We argue that the critical disorder strength at which superfluidity is lost changes non-monotonically with detuning from Feshbach resonance, and that a reentrant superfluid phase arises for detunings near the fermionic mobility edge. Our analysis of the intermediate regime is quantitatively valid for narrow resonances and near four dimensions, and provides a simple physical picture of this regime, in terms of two distinct but coexisting insulators.

Sarang Gopalakrishnan

2012-12-03T23:59:59.000Z

250

Pulsed Gamma-Rays From PSR J2021 3651 with the Fermi Large Area Telescope  

SciTech Connect

We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 {+-} 0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162 {+-} 0.004 {+-} 0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56 {+-} 3 {+-} 11) x 10{sup -8} cm{sup -2} s{sup -1}. The photon spectrum is well-described by an exponentially cut-off power law of the form dF/dE = kE{sup -{Gamma}}e{sup (-E/E{sub c})} where the energy E is expressed in GeV. The photon index is {Gamma} = 1.5 {+-} 0.1 {+-} 0.1 and the exponential cut-off is E{sub c} = 2.4 {+-} 0.3 {+-} 0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524 {+-} 4 rad m{sup -2} but a poorly constrained magnetic geometry. Re-analysis of Chandra data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase-aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.

Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, Marco; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, William B.; /UC, Santa Cruz; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bastieri, Denis; /INFN, Padua /Padua U.; Battelino, Milan; /Royal Inst. Tech., Stockholm; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, Ronaldo; /INFN, Pisa; Berenji, Bijan; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, Elliott D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bogaert, G.; /Ecole Polytechnique; Borgland, Anders W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Burnett, Thompson H.; /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Columbia U. /IASF, Milan /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /George Mason U. /Naval Research Lab, Wash., D.C. /IASF, Milan /IASF, Milan /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /LPCE, Orleans /Montpellier U. /Sonoma State U. /Royal Inst. Tech., Stockholm /Stockholm U. /ASI, Rome /NRAO, Charlottesville /Naval Research Lab, Wash., D.C. /INFN, Trieste /Pavia U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Manchester U. /Montpellier U. /Bari U. /INFN, Bari; /more authors..

2011-11-30T23:59:59.000Z

251

Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1  

Science Conference Proceedings (OSTI)

We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV-100 GeV can be described by a broken power-law function with a break of 2.4 {+-} 0.6 (stat) {+-} 1.2 (sys) GeV, and photon indices of 2.10 {+-} 0.06 (stat) {+-} 0.10 (sys) below the break and 2.70 {+-} 0.12 (stat) {+-} 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of p0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.

Ajello, M.; Allafort, A.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Baldini, L.; /INFN, Pisa; Ballet, J.; /AIM, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Bellazzini, R.; /INFN, Pisa; Berenji, B.; Blandford, R.D.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Bregeon, J.; /INFN, Pisa; Brigida, M.; /Bari Polytechnic /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Buehler, R.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Buson, S.; /INFN, Padua /Padua U.; Caliandro, G.A.; /CSIC, Catalunya; Cameron, R.A.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Caraveo, P.A.; /IASF, Milan /AIM, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Unlisted, US /Naval Research Lab, Wash., D.C. /Perugia U. /ASDC, Frascati /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Trieste Observ. /Hiroshima U. /Nagoya U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /Alabama U., Huntsville /CSIC, Catalunya /Hiroshima U. /NASA, Goddard /Hiroshima U.; /more authors..

2012-09-14T23:59:59.000Z

252

Enrico Fermi Award Nominations | U.S. DOE Office of Science ...  

Office of Science (SC) Website

& Testimony Recovery Act Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 12.04.12 Enrico...

253

The Enrico Fermi Award Homepage | U.S. DOE Office of Science...  

Office of Science (SC) Website

made significant contributions in many areas of science, including the development of quantum theory; fundamental discoveries in nuclear and particle physics involving beta decay,...

254

Fermi LAT Observations of LS I +61 303: First Detection of an Orbital Modulation in GeV Gamma Rays  

SciTech Connect

This Letter presents the first results from the observations of LS I +61{sup o}303 using Large Area Telescope data from the Fermi Gamma-Ray Space Telescope between 2008 August and 2009 March. Our results indicate variability that is consistent with the binary period, with the emission being modulated at 26.6 {+-} 0.5 days. This constitutes the first detection of orbital periodicity in high-energy gamma rays (20 MeV-100 GeV, HE). The light curve is characterized by a broad peak after periastron, as well as a smaller peak just before apastron. The spectrum is best represented by a power law with an exponential cutoff, yielding an overall flux above 100 MeV of 0.82 {+-} 0.03(stat) {+-} 0.07(syst) 10{sup -6} ph cm{sup -2} s{sup -1}, with a cutoff at 6.3 {+-} 1.1(stat) {+-} 0.4(syst) GeV and photon index {Gamma} = 2.21 {+-} 0.04(stat) {+-} 0.06(syst). There is no significant spectral change with orbital phase. The phase of maximum emission, close to periastron, hints at inverse Compton scattering as the main radiation mechanism. However, previous very high-energy gamma ray (>100 GeV, VHE) observations by MAGIC and VERITAS show peak emission close to apastron. This and the energy cutoff seen with Fermi suggest that the link between HE and VHE gamma rays is nontrivial.

Abdo, A.A.; /Federal City Coll. /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U., OKC /Stockholm U.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Blandford, R.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /Milan Polytechnic /DAPNIA, Saclay /ASDC, Frascati /INFN, Perugia /Perugia U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /DAPNIA, Saclay /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Sonoma State U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /Stockholm U. /DAPNIA, Saclay /NASA, Goddard /CSST, Baltimore /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Pavia U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /SLAC /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Grenoble, CEN; /more authors..

2012-04-02T23:59:59.000Z

255

REVISITING THE LONG/SOFT-SHORT/HARD CLASSIFICATION OF GAMMA-RAY BURSTS IN THE FERMI ERA  

SciTech Connect

We perform a statistical analysis of the temporal and spectral properties of the latest Fermi gamma-ray bursts (GRBs) to revisit the classification of GRBs. We find that the bimodalities of duration and the energy ratio (E{sub peak}/Fluence) and the anti-correlation between spectral hardness (hardness ratio (HR), peak energy, and spectral index) and duration (T{sub 90}) support the long/soft-short/hard classification scheme for Fermi GRBs. The HR-T{sub 90} anti-correlation strongly depends on the spectral shape of GRBs and energy bands, and the bursts with the curved spectra in the typical BATSE energy bands show a tighter anti-correlation than those with the power-law spectra in the typical BAT energy bands. This might explain why the HR-T{sub 90} correlation is not evident for those GRB samples detected by instruments like Swift with a narrower/softer energy bandpass. We also analyze the intrinsic energy correlation for the GRBs with measured redshifts and well-defined peak energies. The current sample suggests E{sub p,rest} = 2455 Multiplication-Sign (E{sub iso}/10{sup 52}){sup 0.59} for short GRBs, significantly different from that for long GRBs. However, both the long and short GRBs comply with the same E{sub p,rest}-L{sub iso} correlation.

Zhang Fuwen; Yan Jingzhi; Wei Daming [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China); Shao Lang, E-mail: fwzhang@pmo.ac.cn [Department of Physics, Hebei Normal University, Shijiazhuang 050016 (China)

2012-05-10T23:59:59.000Z

256

Relativistic effects in the tidal interaction between a white dwarf and a massive black hole in Fermi normal coordinates  

E-Print Network (OSTI)

We consider tidal encounters between a white dwarf and an intermediate mass black hole. Both weak encounters and those at the threshold of disruption are modeled. The numerical code combines mesh-based hydrodynamics, a spectral method solution of the self-gravity, and a general relativistic Fermi normal coordinate system that follows the star and debris. Fermi normal coordinates provide an expansion of the black hole tidal field that includes quadrupole and higher multipole moments and relativistic corrections. We compute the mass loss from the white dwarf that occurs in weak tidal encounters. Secondly, we compute carefully the energy deposition onto the star, examining the effects of nonradial and radial mode excitation, surface layer heating, mass loss, and relativistic orbital motion. We find evidence of a slight relativistic suppression in tidal energy transfer. Tidal energy deposition is compared to orbital energy loss due to gravitational bremsstrahlung and the combined losses are used to estimate tidal capture orbits. Heating and partial mass stripping will lead to an expansion of the white dwarf, making it easier for the star to be tidally disrupted on the next passage. Finally, we examine angular momentum deposition. By including the octupole tide, we are able for the first time to calculate deflection of the center of mass of the star and debris. With this observed deflection, and taking into account orbital relativistic effects, we compute directly the change in orbital angular momentum and show its balance with computed spin angular momentum deposition.

Roseanne M. Cheng; Charles R. Evans

2013-03-18T23:59:59.000Z

257

A STATISTICAL APPROACH TO RECOGNIZING SOURCE CLASSES FOR UNASSOCIATED SOURCES IN THE FIRST FERMI-LAT CATALOG  

SciTech Connect

The Fermi Large Area Telescope (LAT) First Source Catalog (1FGL) provided spatial, spectral, and temporal properties for a large number of {gamma}-ray sources using a uniform analysis method. After correlating with the most-complete catalogs of source types known to emit {gamma} rays, 630 of these sources are 'unassociated' (i.e., have no obvious counterparts at other wavelengths). Here, we employ two statistical analyses of the primary {gamma}-ray characteristics for these unassociated sources in an effort to correlate their {gamma}-ray properties with the active galactic nucleus (AGN) and pulsar populations in 1FGL. Based on the correlation results, we classify 221 AGN-like and 134 pulsar-like sources in the 1FGL unassociated sources. The results of these source 'classifications' appear to match the expected source distributions, especially at high Galactic latitudes. While useful for planning future multiwavelength follow-up observations, these analyses use limited inputs, and their predictions should not be considered equivalent to 'probable source classes' for these sources. We discuss multiwavelength results and catalog cross-correlations to date, and provide new source associations for 229 Fermi-LAT sources that had no association listed in the 1FGL catalog. By validating the source classifications against these new associations, we find that the new association matches the predicted source class in {approx}80% of the sources.

Ackermann, M. [Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany); Ajello, M.; Allafort, A.; Berenji, B.; Blandford, R. D.; Bloom, E. D.; Borgland, A. W.; Buehler, R. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Antolini, E.; Bonamente, E. [Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy); Baldini, L.; Bellazzini, R.; Bregeon, J. [Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy); Ballet, J. [Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France); Barbiellini, G. [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy); Bastieri, D. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy); Bouvier, A. [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States); Brandt, T. J. [CNRS, IRAP, F-31028 Toulouse Cedex 4 (France); Brigida, M. [Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy); Bruel, P., E-mail: monzani@slac.stanford.edu, E-mail: vilchez@cesr.fr, E-mail: salvetti@lambrate.inaf.it, E-mail: elizabeth.c.ferrara@nasa.gov [Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France); and others

2012-07-01T23:59:59.000Z

258

Evidence for three-dimensional Fermi-surface topology of the layered electron-doped iron superconductor Ba(Fe1 xCox)2As2  

SciTech Connect

The electronic structure of electron doped iron-arsenide superconductors Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} has been measured with Angle Resolved Photoemission Spectroscopy. The data reveal a marked photon energy dependence of points in momentum space where the bands cross the Fermi energy, a distinctive and direct signature of three-dimensionality in the Fermi surface topology. By providing a unique example of high temperature superconductivity hosted in layered compounds with three-dimensional electronic structure, these findings suggest that the iron-arsenides are unique materials, quite different from the cuprates high temperature superconductors.

Vilmercati, P. [University of Tennessee, Knoxville (UTK); Fedorov, A. V. [Lawrence Berkeley National Laboratory (LBNL); Vobornik, I. [TASC National Laboratory, Trieste, Italy; Manju, U. [TASC National Laboratory, Trieste, Italy; Panaccione, G. [TASC National Laboratory, Trieste, Italy; Goldoni, A. [Sincrotrone Trieste, Basovizza, Italy; Safa-Sefat, Athena [ORNL; McGuire, Michael A [ORNL; Sales, Brian C [ORNL; Jin, Rongying [ORNL; Mandrus, David [ORNL; Singh, David J [ORNL; Mannella, Norman [ORNL

2009-01-01T23:59:59.000Z

259

2009 Awards | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

2009 Awards 2009 Awards About Organization Budget Field Offices Federal Advisory Committees History Scientific and Technical Information Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) DOE's Winners Since 1996 Ceremony The Enrico Fermi Award The Ernest Orlando Lawrence Award DOE Nobel Laureates Federal Laboratory Consortium Excellence in Technology Transfer Award R&D 100 Awards Jobs Brochures, Logos, & Information Resources Contact Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 Presidential Early Career Awards for Scientists and Engineers (PECASE) 2009 Awards Print Text Size: A A A RSS Feeds FeedbackShare Page 2009 PECASE Winners Office of Science Recipients

260

arXiv:0805.0026v1[cond-mat.other]30Apr2008 Using photoemission spectroscopy to probe a strongly interacting Fermi gas  

E-Print Network (OSTI)

vector k. The black lines are the expected dispersion curve for an ideal Fermi gas. The white points and T Tc. The white line is a fit of the centers to a BCS-like dispersion. c Data for a gas on the BEC side to the centers using a quadratic dispersion. troscopy on the strongly interacting gas we extract the intensity

Jin, Deborah

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

SINGLE- AND TWO-COMPONENT GAMMA-RAY BURST SPECTRA IN THE FERMI GBM-LAT ENERGY RANGE  

Science Conference Proceedings (OSTI)

Most Fermi gamma-ray burst spectra appear as either a broken power law extending to GeV energies or as a broken power with a separate GeV power-law component. Here we show that such spectra can be understood in terms of magnetically dominated relativistic jets where a dissipative photosphere produces the prompt MeV emission, which is extended into the GeV range by inverse Compton scattering in the external shock, with possible contributions from a reverse shock as well. The bulk Lorentz factors required in these models are in the range of 300-600, and the MeV-GeV time delays arise naturally. In some cases an optical flash and a sub-dominant thermal component are also present.

Veres, P.; Meszaros, P., E-mail: veresp@psu.edu, E-mail: nnp@astro.psu.edu [Department of Astronomy and Astrophysics, Department of Physics, and Center for Particle Astrophysics, 525 Davey Lab., Pennsylvania State University, University Park, PA 16802 (United States)

2012-08-10T23:59:59.000Z

262

The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data  

SciTech Connect

We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called 'extra-galactic' diffuse {gamma}-ray emission (EGB). This component of the diffuse {gamma}-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse contributions discussed in the literature. The derivation of the EGB is based on detailed modelling of the bright foreground diffuse Galactic {gamma}-ray emission (DGE), the detected LAT sources and the solar {gamma}-ray emission. We find the spectrum of the EGB is consistent with a power law with differential spectral index {gamma} = 2.41 {+-} 0.05 and intensity, I(> 100 MeV) = (1.03 {+-} 0.17) x 10{sup -5} cm{sup -2} s{sup -1} sr{sup -1}, where the error is systematics dominated. Our EGB spectrum is featureless, less intense, and softer than that derived from EGRET data.

Abdo, A. A.

2011-08-19T23:59:59.000Z

263

Gamma-ray astronomy: From Fermi up to the HAWC high-energy {gamma}-ray observatory in Sierra Negra  

SciTech Connect

Gamma-rays represent the most energetic electromagnetic window for the study of the Universe. They are studied both from space at MeV and GeV energies, with instruments like the Fermi{gamma}-ray Space Telescope, and at TeV energies with ground based instruments profiting of particle cascades in the atmosphere and of the Cerenkov radiation of charged particles in the air or in water. The Milagro gamma-ray observatory represented the first instrument to successfully implement the water Cerenkov technique for {gamma}-ray astronomy, opening the ground for the more sensitive HAWC {gamma}-ray observatory, currently under development in the Sierra Negra site and already providing early science results.

Carraminana, Alberto [Instituto Nacional de Astrofisica, Optica y Electronica Luis Enrique Erro 1, Tonantzintla, Puebla 72840 (Mexico); Collaboration: HAWC Collaboration

2013-06-12T23:59:59.000Z

264

Fermi-LAT Discovery of Extended Gamma-Ray Emission in the Direction of Supernova Remnant W51C  

SciTech Connect

The discovery of bright gamma-ray emission coincident with supernova remnant (SNR) W51C is reported using the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope. W51C is a middle-aged remnant ({approx}10{sup 4} yr) with intense radio synchrotron emission in its shell and known to be interacting with a molecular cloud. The gamma-ray emission is spatially extended, broadly consistent with the radio and X-ray extent of SNR W51C. The energy spectrum in the 0.2-50 GeV band exhibits steepening toward high energies. The luminosity is greater than 1 x 10{sup 36} erg s{sup -1} given the distance constraint of D > 5.5 kpc, which makes this object one of the most luminous gamma-ray sources in our Galaxy. The observed gamma-rays can be explained reasonably by a combination of efficient acceleration of nuclear cosmic rays at supernova shocks and shock-cloud interactions. The decay of neutral p mesons produced in hadronic collisions provides a plausible explanation for the gamma-ray emission. The product of the average gas density and the total energy content of the accelerated protons amounts to {bar n}{sub H} W{sub p} {approx_equal} 5 x 10{sup 51} (D/6 kpc){sup 2} erg cm{sup -3}. Electron density constraints from the radio and X-ray bands render it difficult to explain the LAT signal as due to inverse Compton scattering. The Fermi LAT source coincident with SNR W51C sheds new light on the origin of Galactic cosmic rays.

Abdo, A.A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Baring, M.G.; /Rice U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Blandford, R.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bouvier, A.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique /Washington U., Seattle /Padua U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /Milan Polytechnic /DAPNIA, Saclay /INFN, Perugia /Perugia U. /NASA, Goddard /NASA, Goddard /CSST, Baltimore /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Sonoma State U. /Stockholm U. /Stockholm U., OKC /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U. /Bari U. /INFN, Bari /Ecole Polytechnique /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Ecole Polytechnique; /more authors..

2012-03-30T23:59:59.000Z

265

Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Awards Awards Awards Print Wednesday, 29 July 2009 00:00 Recent awards given to ALS staff and users in recognition of their scientific and technical achievements. ALS users and staff are invited to send us information about recent awards by completing this form or by sending an email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it . 2013 December In September, Shuyun Zhou, a previous ALS postdoctoral fellow, received "Outstanding Young Scholar Award" from Qiu Shi Science and Technology Foundation. Shuyun Zhou is currently an associate professor at the Department of Physics at Tsinghua University, Beijing. Before returning to her home university in 2012, she had built her track record from 10 years of research conducted at the ALS, initially as a Ph.D. student of UC Berkeley and ALS doctoral fellow, later as ALS postdoc fellow and project scientist from Materials Sciences Division. Her major achievements include electronic structure studies of graphene using angle-resolved photoemission spectroscopy, and ultrafast dynamic studies of localized electronic orderings in quantum materials using ultrafast time-resolved resonant X-ray scattering. While building her lab-based ultrafast time- and angle-resolved photoemission program at Tsinghua University, she has continued close collaboration with the ALS and recent progress has been made on the intriguing coupling between a topological insulator and a high temperature superconductor.

266

Award  

NLE Websites -- All DOE Office Websites (Extended Search)

PROSPECT received R&D 100 award for 2001 PROSPECT received R&D 100 award for 2001 Drs. Ying Xu and Dong Xu received R&D 100 award in 2001 for the development of PROSPECT. The R&D 100 awards program is designed to honor significant commercial promise in products, materials or processes developed by the international research and development community. Technologies are nominated in open competition and judged by technical experts selected by the Illinois-based R&D Magazine. The magazine uses technical criteria to select the 100 most significant, unique or promising entries from the nominations received. The Chicago Tribune has called the awards "The Oscars of Invention." Others have referred to the R&D 100 Awards as the "Nobel Prizes of Applied Research." Past winners have included breakthroughs like Polacolor film, the flashcube, the digital wristwatch, antilock brakes, the automated teller machine, the liquid crystal display, the halogen lamp, the fax machine, and Fruitrim fat replacer.

267

Federal Laboratory Consortium Excellence in Technology Transfer Award |  

NLE Websites -- All DOE Office Websites (Extended Search)

Federal Laboratory Federal Laboratory Consortium Excellence in Technology Transfer Award About Organization Budget Field Offices Federal Advisory Committees History Scientific and Technical Information Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) The Enrico Fermi Award The Ernest Orlando Lawrence Award DOE Nobel Laureates Federal Laboratory Consortium Excellence in Technology Transfer Award R&D 100 Awards Jobs Brochures, Logos, & Information Resources Contact Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 Honors & Awards Federal Laboratory Consortium Excellence in Technology Transfer Award Print Text Size: A A A RSS Feeds FeedbackShare Page Estimates are that fully half the growth in the American economy in the

268

Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Awards Print Awards Print Recent awards given to ALS staff and users in recognition of their scientific and technical achievements. ALS users and staff are invited to send us information about recent awards by completing this form or by sending an email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it . 2013 December In September, Shuyun Zhou, a previous ALS postdoctoral fellow, received "Outstanding Young Scholar Award" from Qiu Shi Science and Technology Foundation. Shuyun Zhou is currently an associate professor at the Department of Physics at Tsinghua University, Beijing. Before returning to her home university in 2012, she had built her track record from 10 years of research conducted at the ALS, initially as a Ph.D. student of UC Berkeley and ALS doctoral fellow, later as ALS postdoc fellow and project scientist from Materials Sciences Division. Her major achievements include electronic structure studies of graphene using angle-resolved photoemission spectroscopy, and ultrafast dynamic studies of localized electronic orderings in quantum materials using ultrafast time-resolved resonant X-ray scattering. While building her lab-based ultrafast time- and angle-resolved photoemission program at Tsinghua University, she has continued close collaboration with the ALS and recent progress has been made on the intriguing coupling between a topological insulator and a high temperature superconductor.

269

Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Awards Print Awards Print Recent awards given to ALS staff and users in recognition of their scientific and technical achievements. ALS users and staff are invited to send us information about recent awards by completing this form or by sending an email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it . 2013 December In September, Shuyun Zhou, a previous ALS postdoctoral fellow, received "Outstanding Young Scholar Award" from Qiu Shi Science and Technology Foundation. Shuyun Zhou is currently an associate professor at the Department of Physics at Tsinghua University, Beijing. Before returning to her home university in 2012, she had built her track record from 10 years of research conducted at the ALS, initially as a Ph.D. student of UC Berkeley and ALS doctoral fellow, later as ALS postdoc fellow and project scientist from Materials Sciences Division. Her major achievements include electronic structure studies of graphene using angle-resolved photoemission spectroscopy, and ultrafast dynamic studies of localized electronic orderings in quantum materials using ultrafast time-resolved resonant X-ray scattering. While building her lab-based ultrafast time- and angle-resolved photoemission program at Tsinghua University, she has continued close collaboration with the ALS and recent progress has been made on the intriguing coupling between a topological insulator and a high temperature superconductor.

270

FINAL–REPORT NO. 2: INDEPENDENT CONFIRMATORY SURVEY SUMMARY AND RESULTS FOR THE ENRICO FERMI ATOMIC POWER PLANT, UNIT 1, NEWPORT, MICHIGAN (DOCKET NO. 50 16; RFTA 10-004)  

SciTech Connect

The Enrico Fermi Atomic Power Plant, Unit 1 (Fermi 1) was a fast breeder reactor design that was cooled by sodium and operated at essentially atmospheric pressure. On May 10, 1963, the Atomic Energy Commission (AEC) granted an operating license, DPR-9, to the Power Reactor Development Company (PRDC), a consortium specifically formed to own and operate a nuclear reactor at the Fermi 1 site. The reactor was designed for a maximum capability of 430 megawatts (MW); however, the maximum reactor power with the first core loading (Core A) was 200 MW. The primary system was filled with sodium in December 1960 and criticality was achieved in August 1963.

Erika Bailey

2011-07-07T23:59:59.000Z

271

FERMI LARGE AREA TELESCOPE DETECTION OF BRIGHT {gamma}-RAY OUTBURSTS FROM THE PECULIAR QUASAR 4C +21.35  

SciTech Connect

In this paper, we report on the two-year-long Fermi-Large Area Telescope observation of the peculiar blazar 4C +21.35 (PKS 1222+216). This source was in a quiescent state from the start of the science operations of the Fermi Gamma-ray Space Telescope in 2008 August until 2009 September, and then became more active, with gradually increasing flux and some moderately bright flares. In 2010 April and June, 4C +21.35 underwent a very strong GeV outburst composed of several major flares characterized by rise and decay timescales of the order of a day. During the outburst, the GeV spectra of 4C +21.35 displayed a broken power-law form with spectral breaks observed near 1-3 GeV photon energies. We demonstrate that, at least during the major flares, the jet in 4C +21.35 carried a total kinetic luminosity comparable to the total accretion power available to feed the outflow. We also discuss the origin of the break observed in the flaring spectra of 4C +21.35. We show that, in principle, a model involving annihilation of the GeV photons on the He II Lyman recombination continuum and line emission of 'broad-line region' clouds may account for such. However, we also discuss the additional constraint provided by the detection of 4C +21.35 at 0.07-0.4 TeV energies by the MAGIC telescope, which coincided with one of the GeV flares of the source. We argue that there are reasons to believe that the {approx}< TeV emission of 4C +21.35 (as well as the GeV emission of the source, if co-spatial) is not likely to be produced inside the broad-line region zone of highest ionization ({approx}10{sup 17} cm from the nucleus), but instead originates further away from the active center, namely, around the characteristic scale of the hot dusty torus surrounding the 4C +21.35 nucleus ({approx}10{sup 19} cm).

Tanaka, Y. T.; Stawarz, L.; Saito, S.; Ohno, M.; Takahashi, T. [Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan); Thompson, D. J. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); D'Ammando, F. [IASF Palermo, 90146 Palermo (Italy); Fegan, S. J. [Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, Palaiseau (France); Lott, B.; Escande, L. [Universite Bordeaux 1, CNRS/IN2p3, Centre d'Etudes Nucleaires de Bordeaux Gradignan, 33175 Gradignan (France); Wood, D. L.; Finke, J. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Cheung, C. C. [National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001 (United States); Buson, S. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy); Donato, D. [Center for Research and Exploration in Space Science and Technology (CRESST) and NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Chiang, J. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Giroletti, M. [INAF Istituto di Radioastronomia, 40129 Bologna (Italy); Schinzel, F. K. [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn (Germany); Iafrate, G.; Longo, F., E-mail: tanaka@astro.isas.jaxa.jp [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)

2011-05-20T23:59:59.000Z

272

The role of multiparticle correlations and Cooper pairing in the formation of molecules in an ultracold gas of Fermi atoms with a negative scattering length  

Science Conference Proceedings (OSTI)

The influence of multiparticle correlation effects and Cooper pairing in an ultracold Fermi gas with a negative scattering length on the formation rate of molecules is investigated. Cooper pairing is shown to cause the formation rate of molecules to increase, as distinct from the influence of Bose-Einstein condensation in a Bose gas on this rate. This trend is retained in the entire range of temperatures below the critical one.

Babichenko, V. S., E-mail: vsbabichenko@hotmail.com; Kagan, Yu. [National Research Centre Kurchatov Institute (Russian Federation)

2012-11-15T23:59:59.000Z

273

Quantum melting of charge ice and non-Fermi-liquid behavior: An exact solution for the extended Falicov-Kimball model in the ice-rule limit  

E-Print Network (OSTI)

An exact solution is obtained for a model of itinerant electrons coupled to ice-rule variables on the tetrahedron Husimi cactus, an analogue of the Bethe lattice of corner-sharing tetrahedra. It reveals a quantum critical point with the emergence of non-Fermi-liquid behavior in melting of the "charge ice" insulator. The electronic structure is compared with the numerical results for the pyrochlore-lattice model to elucidate the physics of electron systems interacting with the tetrahedron ice rule.

Masafumi Udagawa; Hiroaki Ishizuka; Yukitoshi Motome

2010-06-04T23:59:59.000Z

274

Collective excitation frequencies and stationary states of trapped dipolar Bose-Einstein condensates in the Thomas-Fermi regime  

SciTech Connect

We present a general method for obtaining the exact static solutions and collective excitation frequencies of a trapped Bose-Einstein condensate (BEC) with dipolar atomic interactions in the Thomas-Fermi regime. The method incorporates analytic expressions for the dipolar potential of an arbitrary polynomial density profile, thereby reducing the problem of handling nonlocal dipolar interactions to the solution of algebraic equations. We comprehensively map out the static solutions and excitation modes, including non-cylindrically-symmetric traps, and also the case of negative scattering length where dipolar interactions stabilize an otherwise unstable condensate. The dynamical stability of the excitation modes gives insight into the onset of collapse of a dipolar BEC. We find that global collapse is consistently mediated by an anisotropic quadrupolar collective mode, although there are two trapping regimes in which the BEC is stable against quadrupole fluctuations even as the ratio of the dipolar to s-wave interactions becomes infinite. Motivated by the possibility of a fragmented condensate in a dipolar Bose gas due to the partially attractive interactions, we pay special attention to the scissors modes, which can provide a signature of superfluidity, and identify a long-range restoring force which is peculiar to dipolar systems. As part of the supporting material for this paper we provide the computer program used to make the calculations, including a graphical user interface.

Bijnen, R. M. W. van [Eindhoven University of Technology, P.O. Box 513, NE-5600 MB Eindhoven (Netherlands); Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada); Parker, N. G. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada); School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT (United Kingdom); Kokkelmans, S. J. J. M. F. [Eindhoven University of Technology, P.O. Box 513, NE-5600 MB Eindhoven (Netherlands); Martin, A. M. [School of Physics, University of Melbourne, Parkville, Victoria 3010 (Australia); O'Dell, D. H. J. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)

2010-09-15T23:59:59.000Z

275

Analytical modeling of pulse-pileup distortion using the true pulse shape; applications to Fermi-GBM  

E-Print Network (OSTI)

Pulse-pileup affects most photon counting systems and occurs when photon detections occur faster than the detector's registration and recovery time. At high input rates, shaped pulses interfere and the source spectrum, as well as intensity information, get distorted. For instruments using bipolar pulse shaping there are two aspects to consider: `peak' and `tail' pileup effects, which raise and lower the measured energy, respectively. Peak effects have been extensively modeled in the past. Tail effects have garnered less attention due to the increased complexity: bipolar tails mean the tail pulse-height measurement depends on events in more than one time interval. We leverage previous work to derive an accurate, semi-analytical prediction for peak and tail pileup, up to high orders. We use the true pulse shape from the detectors of the Fermi Gamma-ray Burst Monitor. The measured spectrum is calculated by writing exposure time as a state-space expansion of overlapping pileup states and is valid up to very high rates. This expansion models losses due to fixed and extendable deadtime by averaging overlap configurations. Additionally, the model correctly predicts energy-dependent losses due to tail subtraction (sub-threshold) effects. We discuss pileup losses in terms of the true rate of photon detections versus the recorded count rate.

Vandiver Chaplin; Narayana Bhat; Michael Briggs; Valerie Connaughton

2012-11-28T23:59:59.000Z

276

Fermi acceleration at fast shock in a solar flare and impulsive loop-top hard X-ray source  

E-Print Network (OSTI)

We propose that non-thermal electrons are efficiently accelerated by first-order Fermi process at the fast shock, as a natural consequence of the new magnetohydrodynamic picture of the flaring region revealed with Yohkoh. An oblique fast shock is naturally formed below the reconnection site, and boosts the acceleration to significantly decrease the injection energy. The slow shocks attached to the reconnection X-point heat the plasma up to 10--20 MK, exceeding the injection energy. The combination of the oblique shock configuration and the pre-heating by the slow shock allows bulk electron acceleration from the thermal pool. The accelerated electrons are trapped between the two slow shocks due to the magnetic mirror downstream of the fast shock, thus explaining the impulsive loop-top hard X-ray source discovered with Yohkoh. Acceleration time scale is ~ 0.3--0.6 s, which is consistent with the time scale of impulsive bursts. When these electrons stream away from the region enclosed by the fast shock and the s...

Tsuneta, S; Tsuneta, Saku; Naito, Tsuguya

1998-01-01T23:59:59.000Z

277

Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope  

E-Print Network (OSTI)

The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via gamma rays. Here we report on gamma-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. None of the dwarf galaxies are significantly detected in gamma rays, and we present gamma-ray flux upper limits between 500 MeV and 500 GeV. We determine the dark matter content of 18 dwarf spheroidal galaxies from stellar kinematic data and combine LAT observations of 15 dwarf galaxies to constrain the dark matter annihilation cross section. We set some of the tightest constraints to date on the the annihilation of dark matter particles with masses between 2 GeV and 10 TeV into prototypical Standard Model channels. We find these results to be robust against systematic uncertainties in the LAT instrument performance, diffuse gamma-ray background modeling, and assumed dark matter density profile.

The Fermi-LAT Collaboration; :; M. Ackermann; A. Albert; B. Anderson; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; E. Bissaldi; E. D. Bloom; E. Bonamente; A. Bouvier; T. J. Brandt; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; M. Caragiulo; P. A. Caraveo; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; F. D'Ammando; A. de Angelis; C. D. Dermer; S. W. Digel; E. do Couto e Silva; P. S. Drell; A. Drlica-Wagner; R. Essig; C. Favuzzi; E. C. Ferrara; A. Franckowiak; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; M. Giroletti; G. Godfrey; G. A. Gomez-Vargas; I. A. Grenier; Guiriec; M. Gustafsson; M. Hayashida; E. Hays; J. Hewitt; R. E. Hughes; T. Jogler; T. Kamae; J. Knödlseder; D. Kocevski; M. Kuss; . Larsson; L. Latronico; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; G. Martinez; M. Mayer; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; R. Nemmen; E. Nuss; T. Ohsugi; E. Orlando; J. F. Ormes; J. S. Perkins; F. Piron; G. Pivato; T. A. Porter; S. Rainň; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; S. Ritz; M. Sŕnchez-Conde; N. Sehgal; C. Sgrň; E. J. Siskind; P. Spinelli; L. Strigari; D. J. Suson; H. Tajima; H. Takahashi; J. B. Thayer; L. Tibaldo; M. Tinivella; D. F. Torres; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; G. Vianello; V. Vitale; M. Werner; B. L. Winer; K. S. Wood; M. Wood; G. Zaharijas; S. Zimmer

2013-10-02T23:59:59.000Z

278

Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope  

SciTech Connect

Satellite galaxies of the Milky Way are among the most promising targets for dark matter searches in gamma rays. We present a search for dark matter consisting of weakly interacting massive particles, applying a joint likelihood analysis to 10 satellite galaxies with 24 months of data of the Fermi Large Area Telescope. No dark matter signal is detected. Including the uncertainty in the dark matter distribution, robust upper limits are placed on dark matter annihilation cross sections. The 95% confidence level upper limits range from about 10{sup -26} cm{sup 3} s{sup -1} at 5 GeV to about 5 x 10{sup -23} cm{sup 3} s{sup -1} at 1 TeV, depending on the dark matter annihilation final state. For the first time, using gamma rays, we are able to rule out models with the most generic cross section ({approx}3 x 10{sup -26} cm{sup 3} s{sup -1} for a purely s-wave cross section), without assuming additional boost factors.

Ackermann, M.; Ajello, M.; /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC; Albert, A.; /Taiwan, Natl. Taiwan U. /Ohio State U.; Atwood, W.B.; /UC, Santa Cruz; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Bechtol, K.; /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC; Bellazzini, R.; /INFN, Pisa; Berenji, B.; Blandford, R.D.; Bloom, E.D.; /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC; Bregeon, J.; /INFN, Pisa; Brigida, M.; /Bari Polytechnic /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Buehler, R.; /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC; Burnett, T.H.; /Washington U., Seattle; Buson, S.; /INFN, Padua /Padua U. /ICE, Bellaterra /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /INFN, Rome /Rome U. /IASF, Milan /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /Artep Inc. /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /ASDC, Frascati /Perugia U. /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /Montpellier U. /Stockholm U. /Stockholm U., OKC /ASDC, Frascati /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /Montpellier U. /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Hiroshima U. /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /NASA, Goddard /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /Taiwan, Natl. Taiwan U. /SLAC /DAPNIA, Saclay /Alabama U., Huntsville; /more authors..

2012-09-14T23:59:59.000Z

279

Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV  

SciTech Connect

We present the results of our analysis of cosmic-ray electrons using about 8x10{sup 6} electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law {proportional_to}E{sup -3.08{+-}0.05} with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.

Ackermann, M.; Ajello, M.; Bechtol, K.; Berenji, B.; Blandford, R. D.; Bloom, E. D.; Bogart, J. R.; Borgland, A. W.; Buehler, R.; Cameron, R. A.; Charles, E.; Chiang, J.; Claus, R.; Digel, S. W.; Couto e Silva, E. do; Drell, P. S.; Drlica-Wagner, A.; Dubois, R.; Funk, S.; Glanzman, T. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94305 (United States)

2010-11-01T23:59:59.000Z

280

NEW FERMI-LAT EVENT RECONSTRUCTION REVEALS MORE HIGH-ENERGY GAMMA RAYS FROM GAMMA-RAY BURSTS  

SciTech Connect

Based on the experience gained during the four and a half years of the mission, the Fermi-LAT Collaboration has undertaken a comprehensive revision of the event-level analysis going under the name of Pass 8. Although it is not yet finalized, we can test the improvements in the new event reconstruction with the special case of the prompt phase of bright gamma-ray bursts (GRBs), where the signal-to-noise ratio is large enough that loose selection cuts are sufficient to identify gamma rays associated with the source. Using the new event reconstruction, we have re-analyzed 10 GRBs previously detected by the Large Area Telescope (LAT) for which an X-ray/optical follow-up was possible and found four new gamma rays with energies greater than 10 GeV in addition to the seven previously known. Among these four is a 27.4 GeV gamma ray from GRB 080916C, which has a redshift of 4.35, thus making it the gamma ray with the highest intrinsic energy ({approx}147 GeV) detected from a GRB. We present here the salient aspects of the new event reconstruction and discuss the scientific implications of these new high-energy gamma rays, such as constraining extragalactic background light models, Lorentz invariance violation tests, the prompt emission mechanism, and the bulk Lorentz factor of the emitting region.

Atwood, W. B. [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States); Baldini, L. [Universita di Pisa and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy); Bregeon, J.; Pesce-Rollins, M.; Sgro, C.; Tinivella, M. [Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy); Bruel, P. [Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France); Chekhtman, A. [Center for Earth Observing and Space Research, College of Science, George Mason University, Fairfax, VA 22030 (United States); Cohen-Tanugi, J. [Laboratoire Univers et Particules de Montpellier, Universite Montpellier 2, CNRS/IN2P3, F-34095 Montpellier (France); Drlica-Wagner, A.; Omodei, N.; Rochester, L. S.; Usher, T. L. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Granot, J. [Department of Natural Sciences, The Open University of Israel, 1 University Road, P.O. Box 808, Ra'anana 43537 (Israel); Longo, F. [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy); Razzaque, S. [Department of Physics, University of Johannesburg, Auckland Park 2006 (South Africa); Zimmer, S., E-mail: melissa.pesce.rollins@pi.infn.it, E-mail: nicola.omodei@stanford.edu, E-mail: granot@openu.ac.il [Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm (Sweden)

2013-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

R&D 100 Awards | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

R&D 100 Awards R&D 100 Awards About Organization Budget Field Offices Federal Advisory Committees History Scientific and Technical Information Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) The Enrico Fermi Award The Ernest Orlando Lawrence Award DOE Nobel Laureates Federal Laboratory Consortium Excellence in Technology Transfer Award R&D 100 Awards Jobs Brochures, Logos, & Information Resources Contact Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 Honors & Awards R&D 100 Awards Print Text Size: A A A RSS Feeds FeedbackShare Page R&D 100 Logo Widely recognized in industry, government, and academia as a mark of excellence for the most innovative ideas of the year, the R&D 100

282

Award  

NLE Websites -- All DOE Office Websites (Extended Search)

9 GRANT : COOPERATIVE AGREEMENT 9 GRANT : COOPERATIVE AGREEMENT 3. RECIPIENT (Name, address, zip code, area code and telephone no.) 4. INSTRUMENT NO. 5. AMENDMENT NO. DE-PS26-00NT40854 004 To All Prospective Offerors 6. BUDGET PERIOD 7. PROJECT PERIOD FROM: THRU: FROM: THRU: 8. RECIPIENT PROJECT DIRECTOR (Name and telephone no.) 10. TYPE OF AWARD : NEW 9 CONTINUATION 9 RENEWAL 9 REVISION 9 SUPPLEMENT 9. RECIPIENT BUSINESS OFFICER (Name and telephone no.) 11. DOE PROJECT OFFICER (Name, address, zip code, telephone no.) 12. ADMINISTERED FOR DOE BY (Name, address, zip code, telephone no.) 13. RECIPIENT TYPE 9 STATE GOV'T 9 INDIAN TRIBAL GOV'T 9 HOSPITAL 9 FOR PROFIT 9 INDIVIDUAL ORGANIZATION 9 LOCAL GOV'T 9 INSTITUTION OF 9 OTHER NONPROFIT 9 C 9 P 9 SP 9 OTHER (Specify)

283

Broad Line Radio Galaxies Observed with Fermi-LAT: The Origin of the GeV Gamma-Ray Emission  

SciTech Connect

We report on a detailed investigation of the {gamma}-ray emission from 18 broad line radio galaxies (BLRGs) based on two years of Fermi Large Area Telescope (LAT) data. We confirm the previously reported detections of 3C 120 and 3C 111 in the GeV photon energy range; a detailed look at the temporal characteristics of the observed {gamma}-ray emission reveals in addition possible flux variability in both sources. No statistically significant {gamma}-ray detection of the other BLRGs was however found in the considered dataset. Though the sample size studied is small, what appears to differentiate 3C 111 and 3C 120 from the BLRGs not yet detected in {gamma}-rays is the particularly strong nuclear radio flux. This finding, together with the indications of the {gamma}-ray flux variability and a number of other arguments presented, indicate that the GeV emission of BLRGs is most likely dominated by the beamed radiation of relativistic jets observed at intermediate viewing angles. In this paper we also analyzed a comparison sample of high accretion-rate Seyfert 1 galaxies, which can be considered radio-quiet counterparts of BLRGs, and found none were detected in {gamma}-rays. A simple phenomenological hybrid model applied for the broad-band emission of the discussed radio-loud and radio-quiet type 1 active galaxies suggests that the relative contribution of the nuclear jets to the accreting matter is {ge} 1% on average for BLRGs, while {le} 0.1% for Seyfert 1 galaxies.

Kataoka, J.; /Waseda U., RISE; Stawarz, L.; /JAXA, Sagamihara /Jagiellonian U., Astron. Observ.; Takahashi, Y.; /Waseda U., RISE; Cheung, C.C.; /Natl. Acad. Sci. /Naval Research Lab, Wash., D.C.; Hayashida, M.; /SLAC /Stanford U., HEPL /KIPAC, Menlo Park; Grandi, P.; /Bologna Observ.; Burnett, T.H.; /Washington U., Seattle; Celotti, A.; /SISSA, Trieste; Fegan, S.J.; Fortin, P.; /Ecole Polytechnique; Maeda, K.; Nakamori, T.; /Waseda U., RISE; Taylor, G.B.; /New Mexico U.; Tosti, G.; /INFN, Perugia /Perugia U.; Digel, S.W.; /SLAC /Stanford U., HEPL /KIPAC, Menlo Park; McConville, W.; /NASA, Goddard /Maryland U.; Finke, J.; /Naval Research Lab, Wash., D.C.; D'Ammando, F.; /IASF, Palermo /INAF, Rome

2012-06-07T23:59:59.000Z

284

Discovery of Nine Gamma-Ray Pulsars in Fermi-LAT Data Using a New Blind Search Method  

E-Print Network (OSTI)

We report the discovery of nine previously unknown gamma-ray pulsars in a blind search of data from the Fermi Large Area Telescope (LAT). The pulsars were found with a novel hierarchical search method originally developed for detecting continuous gravitational waves from rapidly rotating neutron stars. Designed to find isolated pulsars spinning at up to kHz frequencies, the new method is computationally efficient, and incorporates several advances, including a metric-based gridding of the search parameter space (frequency, frequency derivative and sky location) and the use of photon probability weights. The nine pulsars have spin frequencies between 3 and 12 Hz, and characteristic ages ranging from 17 kyr to 3 Myr. Two of them, PSRs J1803-2149 and J2111+4606, are young and energetic Galactic-plane pulsars (spin-down power above 6e35 erg/s and ages below 100 kyr). The seven remaining pulsars, PSRs J0106+4855, J0622+3749, J1620-4927, J1746-3239, J2028+3332, J2030+4415, J2139+4716, are older and less energetic; two of them are located at higher Galactic latitudes (|b| > 10 deg). PSR J0106+4855 has the largest characteristic age (3 Myr) and the smallest surface magnetic field (2e11 G) of all LAT blind-search pulsars. PSR J2139+4716 has the lowest spin-down power (3e33 erg/s) among all non-recycled gamma-ray pulsars ever found. Despite extensive multi-frequency observations, only PSR J0106+4855 has detectable pulsations in the radio band. The other eight pulsars belong to the increasing population of radio-quiet gamma-ray pulsars.

H. J. Pletsch; L. Guillemot; B. Allen; M. Kramer; C. Aulbert; H. Fehrmann; P. S. Ray; E. D. Barr; A. Belfiore; F. Camilo; P. A. Caraveo; O. Celik; D. J. Champion; M. Dormody; R. P. Eatough; E. C. Ferrara; P. C. C. Freire; J. W. T. Hessels; M. Keith; M. Kerr; A. de Luca; A. G. Lyne; M. Marelli; M. A. McLaughlin; D. Parent; S. M. Ransom; M. Razzano; W. Reich; P. M. Saz Parkinson; B. W. Stappers; M. T. Wolff

2011-11-02T23:59:59.000Z

285

THE FERMI-GBM X-RAY BURST MONITOR: THERMONUCLEAR BURSTS FROM 4U 0614+09  

Science Conference Proceedings (OSTI)

Thermonuclear bursts from slowly accreting neutron stars (NSs) have proven difficult to detect, yet they are potential probes of the thermal properties of the NS interior. During the first year of a systematic all-sky search for X-ray bursts using the Gamma-ray Burst Monitor aboard the Fermi Gamma-ray Space Telescope we have detected 15 thermonuclear bursts from the NS low-mass X-ray binary 4U 0614+09 when it was accreting at nearly 1% of the Eddington limit. We measured an average burst recurrence time of 12 {+-} 3 days (68% confidence interval) between 2010 March and 2011 March, classified all bursts as normal duration bursts and placed a lower limit on the recurrence time of long/intermediate bursts of 62 days (95% confidence level). We discuss how observations of thermonuclear bursts in the hard X-ray band compare to pointed soft X-ray observations and quantify such bandpass effects on measurements of burst radiated energy and duration. We put our results for 4U 0614+09 in the context of other bursters and briefly discuss the constraints on ignition models. Interestingly, we find that the burst energies in 4U 0614+09 are on average between those of normal duration bursts and those measured in long/intermediate bursts. Such a continuous distribution in burst energy provides a new observational link between normal and long/intermediate bursts. We suggest that the apparent bimodal distribution that defined normal and long/intermediate duration bursts during the last decade could be due to an observational bias toward detecting only the longest and most energetic bursts from slowly accreting NSs.

Linares, M.; Chakrabarty, D. [Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Cambridge, MA 02139 (United States); Connaughton, V.; Bhat, P. N.; Briggs, M. S.; Preece, R. [CSPAR and Physics Department, University of Alabama in Huntsville, Huntsville, AL 35899 (United States); Jenke, P.; Kouveliotou, C.; Wilson-Hodge, C. A. [Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States); Van der Horst, A. J. [Astronomical Institute 'Anton Pannekoek', University of Amsterdam, NL-1090-GE Amsterdam (Netherlands); Camero-Arranz, A.; Finger, M.; Paciesas, W. S. [Universities Space Research Association, Huntsville, AL 35805 (United States); Beklen, E. [Physics Department, Suleyman Demirel University, 32260 Isparta (Turkey); Von Kienlin, A. [Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, Postfach 1312, D-85748 Garching (Germany)

2012-12-01T23:59:59.000Z

286

SGR J1550-5418 BURSTS DETECTED WITH THE FERMI GAMMA-RAY BURST MONITOR DURING ITS MOST PROLIFIC ACTIVITY  

Science Conference Proceedings (OSTI)

We have performed detailed temporal and time-integrated spectral analysis of 286 bursts from SGR J1550-5418 detected with the Fermi Gamma-ray Burst Monitor (GBM) in 2009 January, resulting in the largest uniform sample of temporal and spectral properties of SGR J1550-5418 bursts. We have used the combination of broadband and high time-resolution data provided with GBM to perform statistical studies for the source properties. We determine the durations, emission times, duty cycles, and rise times for all bursts, and find that they are typical of SGR bursts. We explore various models in our spectral analysis, and conclude that the spectra of SGR J1550-5418 bursts in the 8-200 keV band are equally well described by optically thin thermal bremsstrahlung (OTTB), a power law (PL) with an exponential cutoff (Comptonized model), and two blackbody (BB) functions (BB+BB). In the spectral fits with the Comptonized model, we find a mean PL index of -0.92, close to the OTTB index of -1. We show that there is an anti-correlation between the Comptonized E{sub peak} and the burst fluence and average flux. For the BB+BB fits, we find that the fluences and emission areas of the two BB functions are correlated. The low-temperature BB has an emission area comparable to the neutron star surface area, independent of the temperature, while the high-temperature BB has a much smaller area and shows an anti-correlation between emission area and temperature. We compare the properties of these bursts with bursts observed from other SGR sources during extreme activations, and discuss the implications of our results in the context of magnetar burst models.

Van der Horst, A. J.; Finger, M. H. [Universities Space Research Association, NSSTC, Huntsville, AL 35805 (United States); Kouveliotou, C. [Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States); Gorgone, N. M. [Connecticut College, New London, CT 06320 (United States); Kaneko, Y.; Goegues, E.; Lin, L. [Sabanc Latin-Small-Letter-Dotless-I University, Orhanl Latin-Small-Letter-Dotless-I -Tuzla, Istanbul 34956 (Turkey); Baring, M. G. [Department of Physics and Astronomy, Rice University, MS-108, P.O. Box 1892, Houston, TX 77251 (United States); Guiriec, S.; Bhat, P. N.; Chaplin, V. L.; Goldstein, A. [University of Alabama, Huntsville, CSPAR, Huntsville, AL 35805 (United States); Granot, J. [Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel); Watts, A. L. [Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Postbus 94249, 1090 GE Amsterdam (Netherlands); Bissaldi, E.; Gruber, D. [Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, Postfach 1312, 85748 Garching (Germany); Gehrels, N.; Harding, A. K. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Gibby, M. H.; Giles, M. M., E-mail: A.J.VanDerHorst@uva.nl [Jacobs Technology, Inc., Huntsville, AL (United States); and others

2012-04-20T23:59:59.000Z

287

GRB 090926A AND BRIGHT LATE-TIME FERMI LARGE AREA TELESCOPE GAMMA-RAY BURST AFTERGLOWS  

SciTech Connect

GRB 090926A was detected by both the Gamma-ray Burst Monitor and Large Area Telescope (LAT) instruments on board the Fermi Gamma-ray Space Telescope. Swift follow-up observations began {approx}13 hr after the initial trigger. The optical afterglow was detected for nearly 23 days post trigger, placing it in the long-lived category. The afterglow is of particular interest due to its brightness at late times, as well as the presence of optical flares at T0+10{sup 5} s and later, which may indicate late-time central engine activity. The LAT has detected a total of 16 gamma-ray bursts; nine of these bursts, including GRB 090926A, also have been observed by Swift. Of the nine Swift-observed LAT bursts, six were detected by UVOT, with five of the bursts having bright, long-lived optical afterglows. In comparison, Swift has been operating for five years and has detected nearly 500 bursts, but has only seen {approx}30% of bursts with optical afterglows that live longer than 10{sup 5} s. We have calculated the predicted gamma-ray fluence, as would have been seen by the Burst Alert Telescope (BAT) on board Swift, of the LAT bursts to determine whether this high percentage of long-lived optical afterglows is unique, when compared to BAT-triggered bursts. We find that, with the exception of the short burst GRB 090510A, the predicted BAT fluences indicate that the LAT bursts are more energetic than 88% of all Swift bursts and also have brighter than average X-ray and optical afterglows.

Swenson, C. A.; Roming, P. W. A.; Vetere, L.; Kennea, J. A. [Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States); Maxham, A.; Zhang, B. B.; Zhang, B. [University of Nevada, Las Vegas, Box 454002, 4505 Maryland Parkway, Las Vegas, NV 89154 (United States); Schady, P. [Max-Planck-Institut fuer extraterrestrische Physik, Garching (Germany); Holland, S. T. [Universities Space Research Association, 10227 Wincopin Circle, Suite 500, Columbia, MD 21044 (United States); Kuin, N. P. M.; Oates, S. R.; De Pasquale, M. [The UCL Mullard Space Science Laboratory, Holmbury St Mary, Surrey, RH5 6NT (United Kingdom); Page, K. L., E-mail: cswenson@astro.psu.ed [Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH (United Kingdom)

2010-07-20T23:59:59.000Z

288

Fermi LAT Observation of Diffuse Gamma-Rays Produced through Interactions Between Local Interstellar Matter and High Energy Cosmic Rays  

DOE Green Energy (OSTI)

Observations by the Large Area Telescope (LAT) on the Fermi mission of diffuse {gamma}-rays in a mid-latitude region in the third quadrant (Galactic longitude l from 200{sup o} to 260{sup o} and latitude |b| from 22{sup o} to 60{sup o}) are reported. The region contains no known large molecular cloud and most of the atomic hydrogen is within 1 kpc of the solar system. The contributions of {gamma}-ray point sources and inverse Compton scattering are estimated and subtracted. The residual {gamma}-ray intensity exhibits a linear correlation with the atomic gas column density in energy from 100 MeV to 10 GeV. The measured integrated {gamma}-ray emissivity is (1.63 {+-} 0.05) x 10{sup -26} photons s{sup -1}sr{sup -1} H-atom{sup -1} and (0.66 {+-} 0.02) x 10{sup -26} photons s{sup -1}sr{sup -1} H-atom{sup -1} above 100 MeV and above 300 MeV, respectively, with an additional systematic error of {approx}10%. The differential emissivity from 100 MeV to 10 GeV agrees with calculations based on cosmic ray spectra consistent with those directly measured, at the 10% level. The results obtained indicate that cosmic ray nuclei spectra within 1 kpc from the solar system in regions studied are close to the local interstellar spectra inferred from direct measurements at the Earth within {approx}10%.

Abdo, A.A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U. /Stockholm U., OKC; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Burnett, T.H.; /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /Milan Polytechnic /Royal Inst. Tech., Stockholm /Stockholm U., OKC /DAPNIA, Saclay /INFN, Perugia /Perugia U. /NASA, Goddard /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Stockholm U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U. /Bari U. /INFN, Bari /Ecole Polytechnique /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Trieste /Hiroshima U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Bari U. /INFN, Bari /INFN, Bari; /more authors..

2012-03-30T23:59:59.000Z

289

Pulsed Gamma-Rays From the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope  

SciTech Connect

We report the discovery of gamma-ray pulsations from the nearby isolated millisecond pulsar PSR J0030+0451 with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). This discovery makes PSR J0030+0451 the second millisecond pulsar to be detected in gamma-rays after PSR J0218+4232, observed by the EGRET instrument on the Compton Gamma Ray Observatory. The spin-down power {dot E} = 3.5 x 10{sup 33} ergs s{sup -1} is an order of magnitude lower than the empirical lower bound of previously known gamma-ray pulsars. The emission profile is characterized by two narrow peaks, respectively 0.07 {+-} 0.01 and 0.08 {+-} 0.02 wide, separated by 0.44 {+-} 0.02 in phase. The first gamma-ray peak falls 0.15 {+-} 0.01 after the main radio peak. The pulse shape is similar to that of the 'normal' gamma-ray pulsars. An exponentially cut-off power-law fit of the emission spectrum leads to an integral photon flux above 100 MeV of (6.76 {+-} 1.05 {+-} 1.35) x 10{sup -8} cm{sup -2} s{sup -1} with cut-off energy (1.7 {+-} 0.4 {+-} 0.5) GeV. Based on its parallax distance of (300 {+-} 90) pc, we obtain a gamma-ray efficiency L{sub {gamma}}/{dot E} {approx_equal} 15% for the conversion of spin-down energy rate into gamma-ray radiation, assuming isotropic emission.

Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M. /Stockholm U., OKC /Stockholm U.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bastieri, Denis; /INFN, Padua /Padua U.; Battelino, M.; /Stockholm U., OKC /Royal Inst. Tech., Stockholm; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, Elliott D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Burnett, Thompson H.; /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /George Mason U. /Naval Research Lab, Wash., D.C. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /LPCE, Orleans /Montpellier U. /Sonoma State U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /Stockholm U. /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Trieste /Hiroshima U.; /more authors..

2011-11-17T23:59:59.000Z

290

Honors & Awards | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Honors & Awards Honors & Awards About Organization Budget Field Offices Federal Advisory Committees History Scientific and Technical Information Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) The Enrico Fermi Award The Ernest Orlando Lawrence Award DOE Nobel Laureates Federal Laboratory Consortium Excellence in Technology Transfer Award R&D 100 Awards Jobs Brochures, Logos, & Information Resources Contact Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 Honors & Awards Print Text Size: A A A RSS Feeds FeedbackShare Page The Office of Science is privileged to work with the most talented scientists and engineers in the country to advance the Office's mission.

291

DOE-Funded Research Projects Win 35 R&D 100 Awards for 2003 | U.S. DOE  

Office of Science (SC) Website

35 R&D 100 Awards for 2003 35 R&D 100 Awards for 2003 About Organization Budget Field Offices Federal Advisory Committees History Scientific and Technical Information Honors & Awards Presidential Early Career Awards for Scientists and Engineers (PECASE) The Enrico Fermi Award The Ernest Orlando Lawrence Award DOE Nobel Laureates Federal Laboratory Consortium Excellence in Technology Transfer Award R&D 100 Awards Jobs Brochures, Logos, & Information Resources Contact Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 R&D 100 Awards DOE-Funded Research Projects Win 35 R&D 100 Awards for 2003 Print Text Size: A A A RSS Feeds FeedbackShare Page Thirty-five research projects funded by the U.S. Department of Energy have

292

Establishing the Presence of Coherence in Atomic Fermi Superfluids: Spin-Flip and Spin-Preserving Bragg Scattering at Finite Temperatures  

SciTech Connect

We show how in ultracold Fermi gases the difference between the finite temperature T structure factors, called S{sub -}({omega},q), associated with spin and density, reflects coherent order at all {omega}, q, k{sub F}a, and T. This observation can be exploited in two photon Bragg scattering experiments on gases which are subject to variable attractive interactions. Our calculations incorporate spin and particle number conservation laws which lead to compatibility at general T with two f-sum rules. Because of its generality a measurement of S{sub -}({omega},q) can be a qualitative, direct, in situ approach for establishing superfluid order.

Guo Hao; Levin, K. [James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637 (United States); Chien, Chih-Chun [Theoretical Division, Los Alamos National Laboratory, MS B213, Los Alamos, New Mexico 87545 (United States)

2010-09-17T23:59:59.000Z

293

Fermi National Accelerator Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

fiscal fiscal year 2013, Fermilab spent $131.6 million in the United States to purchase goods and services in 47 states and the District of Columbia. Procurements in Illinois accounted for approximately $50 million, and about $80 million was spent in other states. Fermilab Procurements Alabama, Arkansas, Arizona, Delaware, Idaho, Kentucky, Louisiana, Maine, Mississippi, Montana, North Dakota, Nevada, Oklahoma, Utah, Wyoming Connecticut, Georgia, Iowa, Kansas, Michigan, North Carolina, Rhode Island, Tennessee, Vermont $1,000,001-$5,000,000 Indiana, Maryland, New Hampshire, Washington Colorado, District of Columbia, Florida, Massachusetts, Missouri, Nebraska, New Jersey, New Mexico, Oregon, Pennsylvania, South Carolina, South Dakota, Texas, Wisconsin More than $5 million

294

Fermi UNIX trademark environment  

SciTech Connect

The introduction of UNIX at Fermilab involves multiple platforms and multiple vendors. Additionally, a single user may have to use more than one platform. This heterogeneity and multiplicity makes it necessary to define a Fermilab environment for UNIX so that as much as possible the systems look and feel'' the same. We describe our environment, including both the commercial products and the local tools used to support it. Other products designed for the UNIX environment are also described. 19 refs.

Nicholls, J.

1991-03-01T23:59:59.000Z

295

Fermi National Accelerator Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Alabama, Conneticut, Idaho, Kentucky, Louisana, Maine, Mississippi, Nevada, North Dakota, South Dakota, Utah, Vermont 100,001-500,000 Arizona, Arkansas, Deleware, Florida,...

296

Fermi National Accelerator Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

New Jersey, New Mexico, Texas, Virginia, West Virginia More than 10 million California, Illinois, New York, Ohio, Pennsylvania, Wisconsin 0-100 Florida, Hawaii, South Dakota...

297

Lifshits quantum phase transitions and rearrangement of the Fermi surface upon a change in the hole concentration in high-temperature superconductors  

SciTech Connect

Changes in the electronic structure in the normal phase of high-T{sub c} superconductors (HTSCs), viz., layered cuprates, are considered. The results of LDA + GTB calculations of the electron structure and the Fermi surface of La{sub 2-x}Sr{sub x}CuO{sub 4} one-layer cuprates with allowance for strong correlations are compared with ARPES and quantum oscillations data. Two critical points x{sub c1} and x{sub c2} are discovered at which the rear-rangement of the Fermi surface takes place. In the vicinity of these points, changes in the thermodynamic properties at low temperatures are determined using the Lifshits ideology concerning 2.5-order quantum phase transitions. A singularity {delta}(C/T) {proportional_to} (x - x{sub e}){sup 1/2} in the electron heat capacity agrees well with the available experimental data in the vicinity of x{sub c1} {approx} 0.15. Sign reversal of the Hall constant upon doping is also considered qualitatively.

Ovchinnikov, S. G., E-mail: sgo@iph.krasn.ru; Korshunov, M. M.; Shneyder, E. I. [Russian Academy of Sciences, Kirenskii Institute of Physics, Siberian Branch (Russian Federation)

2009-11-15T23:59:59.000Z

298

GRB 110709A, 111117A, AND 120107A: FAINT HIGH-ENERGY GAMMA-RAY PHOTON EMISSION FROM FERMI-LAT OBSERVATIONS AND DEMOGRAPHIC IMPLICATIONS  

SciTech Connect

Launched on 2008 June 11, the Large Area Telescope (LAT) instrument on board the Fermi Gamma-ray Space Telescope has provided a rare opportunity to study high-energy photon emission from gamma-ray bursts (GRBs). Although the majority of such events (27) have been identified by the Fermi-LAT Collaboration, four were uncovered by using more sensitive statistical techniques. In this paper, we continue our earlier work by finding three more GRBs associated with high-energy photon emission, GRB 110709A, 111117A, and 120107A. To systematize our matched filter approach, a pipeline has been developed to identify these objects in nearly real time. GRB 120107A is the first product of this analysis procedure. Despite the reduced threshold for identification, the number of GRB events has not increased significantly. This relative dearth of events with low photon number prompted a study of the apparent photon number distribution. We find an extremely good fit to a simple power law with an exponent of -1.8 {+-} 0.3 for the differential distribution. As might be expected, there is a substantial correlation between the number of lower energy photons detected by the Gamma-ray Burst Monitor (GBM) and the number observed by LAT. Thus, high-energy photon emission is associated with some but not all of the brighter GBM events. Deeper studies of the properties of the small population of high-energy emitting bursts may eventually yield a better understanding of these entire phenomena.

Zheng Weikang; Akerlof, Carl W.; McKay, Timothy A. [Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109 (United States); Pandey, Shashi B. [Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263129 (India); Zhang Binbin [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Zhang Bing [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States); Sakamoto, Takanori, E-mail: zwk@umich.edu [Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2012-09-01T23:59:59.000Z

299

Revised FINAL–REPORT NO. 2: INDEPENDENT CONFIRMATORY SURVEY SUMMARY AND RESULTS FOR THE ENRICO FERMI ATOMIC POWER PLANT, UNIT 1, NEWPORT, MICHIGAN (DOCKET NO. 50 16; RFTA 10-004) 2018-SR-02-1  

Science Conference Proceedings (OSTI)

The Enrico Fermi Atomic Power Plant, Unit 1 (Fermi 1) was a fast breeder reactor design that was cooled by sodium and operated at essentially atmospheric pressure. On May 10, 1963, the Atomic Energy Commission (AEC) granted an operating license, DPR-9, to the Power Reactor Development Company (PRDC), a consortium specifically formed to own and operate a nuclear reactor at the Fermi 1 site. The reactor was designed for a maximum capability of 430 megawatts (MW); however, the maximum reactor power with the first core loading (Core A) was 200 MW. The primary system was filled with sodium in December 1960 and criticality was achieved in August 1963. The reactor was tested at low power during the first couple years of operation. Power ascension testing above 1 MW commenced in December 1965 immediately following the receipt of a high-power operating license. In October 1966 during power ascension, zirconium plates at the bottom of the reactor vessel became loose and blocked sodium coolant flow to some fuel subassemblies. Two subassemblies started to melt and the reactor was manually shut down. No abnormal releases to the environment occurred. Forty-two months later after the cause had been determined, cleanup completed, and the fuel replaced, Fermi 1 was restarted. However, in November 1972, PRDC made the decision to decommission Fermi 1 as the core was approaching its burn-up limit. The fuel and blanket subassemblies were shipped off-site in 1973. Following that, the secondary sodium system was drained and sent off-site. The radioactive primary sodium was stored on-site in storage tanks and 55 gallon (gal) drums until it was shipped off-site in 1984. The initial decommissioning of Fermi 1 was completed in 1975. Effective January 23, 1976, DPR-9 was transferred to the Detroit Edison Company (DTE) as a 'possession only' license (DTE 2010a). This report details the confirmatory activities performed during the second Oak Ridge Institute for Science and Education (ORISE) site visit to Fermi 1 in November 2010. The survey was strategically planned during a Unit 2 (Fermi 2) outage to take advantage of decreased radiation levels that were observed and attributed to Fermi 2 from the operating unit during the first site visit. However, during the second visit there were elevated radiation levels observed and attributed to the partially dismantled Fermi 1 reactor vessel and a waste storage box located on the 3rd floor of the Fermi 1 Turbine Building. Confirmatory surveys (unshielded) performed directly in the line of sight of these areas were affected. The objective of the confirmatory survey was to verify that the final radiological conditions were accurately and adequately described in Final Status Survey (FSS) documentation, relative to the established release criteria. This objective was achieved by performing document reviews, as well as independent measurements and sampling. Specifically, documentation of the planning, implementation, and results of the FSS were evaluated; side-by-side FSS measurement and source comparisons were performed; site areas were evaluated relative to appropriate FSS classification; and areas were assessed for residual, undocumented contamination.

Erika Bailey

2011-10-27T23:59:59.000Z

300

CONSTRAINTS ON COSMIC RAYS, MAGNETIC FIELDS, AND DARK MATTER FROM GAMMA-RAY OBSERVATIONS OF THE COMA CLUSTER OF GALAXIES WITH VERITAS AND FERMI  

SciTech Connect

Observations of radio halos and relics in galaxy clusters indicate efficient electron acceleration. Protons should likewise be accelerated and, on account of weak energy losses, can accumulate, suggesting that clusters may also be sources of very high energy (VHE; E > 100 GeV) gamma-ray emission. We report here on VHE gamma-ray observations of the Coma galaxy cluster with the VERITAS array of imaging Cerenkov telescopes, with complementing Fermi Large Area Telescope observations at GeV energies. No significant gamma-ray emission from the Coma Cluster was detected. Integral flux upper limits at the 99% confidence level were measured to be on the order of (2-5) Multiplication-Sign 10{sup -8} photons m {sup -2} s {sup -1} (VERITAS, >220 GeV) and {approx}2 Multiplication-Sign 10{sup -6} photons m {sup -2} s {sup -1} (Fermi, 1-3 GeV), respectively. We use the gamma-ray upper limits to constrain cosmic rays (CRs) and magnetic fields in Coma. Using an analytical approach, the CR-to-thermal pressure ratio is constrained to be <16% from VERITAS data and <1.7% from Fermi data (averaged within the virial radius). These upper limits are starting to constrain the CR physics in self-consistent cosmological cluster simulations and cap the maximum CR acceleration efficiency at structure formation shocks to be <50%. Alternatively, this may argue for non-negligible CR transport processes such as CR streaming and diffusion into the outer cluster regions. Assuming that the radio-emitting electrons of the Coma halo result from hadronic CR interactions, the observations imply a lower limit on the central magnetic field in Coma of {approx}(2-5.5) {mu}G, depending on the radial magnetic field profile and on the gamma-ray spectral index. Since these values are below those inferred by Faraday rotation measurements in Coma (for most of the parameter space), this renders the hadronic model a very plausible explanation of the Coma radio halo. Finally, since galaxy clusters are dark matter (DM) dominated, the VERITAS upper limits have been used to place constraints on the thermally averaged product of the total self-annihilation cross section and the relative velocity of the DM particles, ({sigma}v).

Arlen, T. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Aune, T.; Bouvier, A. [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Beilicke, M.; Buckley, J. H.; Bugaev, V.; Dickherber, R. [Department of Physics, Washington University, St. Louis, MO 63130 (United States); Benbow, W. [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States); Byrum, K. [Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (United States); Cannon, A.; Collins-Hughes, E. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Cesarini, A.; Connolly, M. P. [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland); Ciupik, L. [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States); Cui, W.; Feng, Q.; Finley, J. P. [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States); Dumm, J. [School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States); Falcone, A. [Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States); Federici, S., E-mail: pohlmadq@gmail.com, E-mail: christoph.pfrommer@h-its.org [DESY, Platanenallee 6, D-15738 Zeuthen (Germany); and others

2012-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Fermi Guest Investigator Program Cycle 2 Project Final Report Albedo Polarimetry of Gamma-Ray Bursts and Solar Flares with GBM  

SciTech Connect

Several key properties of GRBs remain poorly understood and are difficult or even impossible to infer with the information currently being collected. Polarization measurements will probe the precise nature of the central engine. For solar flares, high-energy polarization measurements are expected to be useful in determining the beaming (or directivity) of solar flare electrons - a quantity that may provide important clues about electron acceleration and transport. We propose to investigate the viability of using the Fermi Gamma-ray Burst Monitor (GBM) to measure the polarization of GRBs and solar flares using the albedo photon flux. This approach was previously developed for use with BATSE data. We will conduct a careful study of this technique using a modified version of the GRESS simulation tools developed by the GBM team.

Kippen, Richard Marc [Los Alamos National Laboratory

2012-08-27T23:59:59.000Z

302

Measurement of the Cosmic Ray e+ plus e- Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope  

SciTech Connect

Designed as a high-sensitivity gamma-ray observatory, the Fermi Large Area Telescope is also an electron detector with a large acceptance exceeding 2 m{sup 2}sr at 300 GeV. Building on the gamma-ray analysis, we have developed an efficient electron detection strategy which provides sufficient background rejection for measurement of the steeply-falling electron spectrum up to 1 TeV. Our high precision data show that the electron spectrum falls with energy as E{sup -3.0} and does not exhibit prominent spectral features. Interpretations in terms of a conventional diffusive model as well as a potential local extra component are briefly discussed.

Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U., OKC /Stockholm U.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bastieri, Denis; /INFN, Padua /Padua U.; Battelino, M.; /Stockholm U., OKC /Royal Inst. Tech., Stockholm; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Blandford, R.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, Elliott D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bogaert, G.; /Ecole Polytechnique; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa /Bari U. /INFN, Bari /Ecole Polytechnique /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /IASF, Milan /Stockholm U., OKC /Royal Inst. Tech., Stockholm /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /George Mason U. /Naval Research Lab, Wash., D.C. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Sonoma State U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /Stockholm U. /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Pisa /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Bari U. /INFN, Bari; /more authors..

2012-05-14T23:59:59.000Z

303

DOE/EA-1570: Final Environmental Assessment for Construction and Operation of Neutrinos at the Main Injector Off-Axis Electron Neutrino Appearance Experiment at the Fermi National Accelerator Laboratory, Batavia, Illinois, and St. Louis County, Minnesota  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

70 70 FINAL ENVIRONMENTAL ASSESSMENT Environmental Assessment for Construction and Operation of Neutrinos at the Main Injector Off-Axis Electron Neutrino (ν e ) Appearance Experiment (NOvA) at the Fermi National Accelerator Laboratory, Batavia, Illinois, and St. Louis County, Minnesota U.S. Department of Energy, Lead Agency Fermi Site Office Batavia, IL U.S. Army Corps of Engineers, Cooperating Agency St. Paul District St. Paul, MN June 2008 (DOE/EA-1570) NOvA Environmental Assessment June 2008 ii DISCLAIMER Reference herein to any specific commercial product, process or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any

304

Comment on "A limit on the variation of the speed of light arising from quantum gravity effects" aka "Testing Einstein's special relativity with Fermi's short hard gamma-ray burst GRB090510"  

E-Print Network (OSTI)

Recently the Fermi GBM and LAT Collaborations reported their new observational data disfavoring quite a number of the quantum gravity theories, including the one suggesting the nonlinear (logarithmic) modification of a quantum wave equation. We show that the latter is still far from being ruled out: it is not only able to explain the new data but also its phenomenological implications turn out to be more vast (and more interesting) than one expected before.

Konstantin G. Zloshchastiev

2009-11-30T23:59:59.000Z

305

VERY RAPID HIGH-AMPLITUDE GAMMA-RAY VARIABILITY IN LUMINOUS BLAZAR PKS 1510-089 STUDIED WITH FERMI-LAT  

SciTech Connect

Here we report on the detailed analysis of the {gamma}-ray light curve of a luminous blazar PKS 1510-089 observed in the GeV range with the Large Area Telescope (LAT) on board the Fermi satellite during the period 2011 September-December. By investigating the properties of the detected three major flares with the shortest possible time binning allowed by the photon statistics, we find a variety of temporal characteristics and variability patterns. This includes a clearly asymmetric profile (with a faster flux rise and a slower decay) of the flare resolved on sub-daily timescales, a superposition of many short uncorrelated flaring events forming the apparently coherent longer-duration outburst, and a huge single isolated outburst unresolved down to the timescale of 3 hr. In the latter case we estimate the corresponding {gamma}-ray flux doubling timescale to be below 1 hr, which is extreme and never previously reported for any active galaxy in the GeV range. The other unique finding is that the total power released during the studied rapid and high-amplitude flares constitutes the bulk of the power radiatively dissipated in the source and a significant fraction of the total kinetic luminosity of the underlying relativistic outflow. Our analysis allows us to access directly the characteristic timescales involved in shaping the energy dissipation processes in the source, and to provide constraints on the location and the structure of the blazar emission zone in PKS 1510-089.

Saito, S.; Stawarz, L.; Takahashi, T. [Institute of Space and Astronautical Science JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan); Tanaka, Y. T. [Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan); Madejski, G. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); D'Ammando, F., E-mail: ssaitoh@astro.isas.jaxa.jp [Dip. di Fisica, Universita degli Studi di Perugia and INFN, Via A. Pascoli, I-06123 Perugia (Italy)

2013-03-20T23:59:59.000Z

306

Discovery of Pulsations from the Pulsar J0205 6449 in SNR 3C 58 with the Fermi Gamma-Ray Space Telescope  

SciTech Connect

We report the discovery of {gamma}-ray pulsations ({ge}0.1 GeV) from the young radio and X-ray pulsar PSR J0205 + 6449 located in the Galactic supernova remnant 3C 58. Data in the {gamma}-ray band were acquired by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope (formerly GLAST), while the radio rotational ephemeris used to fold {gamma}-rays was obtained using both the Green Bank Telescope and the Lovell telescope at Jodrell Bank. The light curve consists of two peaks separated by 0.49 {+-} 0.01 {+-} 0.01 cycles which are aligned with the X-ray peaks. The first {gamma}-ray peak trails the radio pulse by 0.08 {+-} 0.01 {+-} 0.01, while its amplitude decreases with increasing energy as for the other {gamma}-ray pulsars. Spectral analysis of the pulsed {gamma}-ray emission suggests a simple power law of index -2.1 {+-} 0.1 {+-} 0.2 with an exponential cutoff at 3.0{sub -0.7}{sup +1.1} {+-} 0.4 GeV. The first uncertainty is statistical and the second is systematic. The integral {gamma}-ray photon flux above 0.1 GeV is (13.7 {+-} 1.4 {+-} 3.0) x 10{sup -8} cm{sup -2} s{sup -1}, which implies for a distance of 3.2 kpc and assuming a broad fan-like beam a luminosity of 8.3 x 10{sup 34} erg s{sup -1} and an efficiency {eta} of 0.3%. Finally, we report a 95% upper limit on the flux of 1.7 x 10{sup -8} cm{sup -2} s{sup -1} for off-pulse emission from the object.

Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, Marco; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, William B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U., OKC /Stockholm U.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bastieri, Denis; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, Ronaldo; /INFN, Pisa; Berenji, Bijan; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Blandford, Roger D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, Elliott D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, Anders W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bouvier, A.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari /Ecole Polytechnique /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Columbia U. /IASF, Milan /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /NASA, Goddard /George Mason U. /Naval Research Lab, Wash., D.C. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /LPCE, Orleans /Montpellier U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /Stockholm U. /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Manchester U. /Montpellier U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; /more authors..

2011-12-01T23:59:59.000Z

307

A COMPREHENSIVE ANALYSIS OF FERMI GAMMA-RAY BURST DATA. II. E{sub p} EVOLUTION PATTERNS AND IMPLICATIONS FOR THE OBSERVED SPECTRUM-LUMINOSITY RELATIONS  

SciTech Connect

We present a time-resolved spectral analysis of 51 long and 11 short bright gamma-ray bursts (GRBs) observed with the Fermi/Gamma-Ray Burst Monitor, paying special attention to E{sub p} evolution within each burst. Among eight single-pulse long GRBs, five show an evolution from hard to soft, while three show intensity tracking. The multi-pulse long GRBs have more complicated patterns. Statistically, the hard-to-soft evolution pulses tend to be more asymmetric than the intensity-tracking ones, with a steeper rising wing than the falling wing. Short GRBs have E{sub p} tracking intensity exclusively with the 16 ms time-resolution analysis. We performed a simulation analysis and suggest that for at least some bursts, the late intensity-tracking pulses could be a consequence of overlapping hard-to-soft pulses. However, the fact that the intensity-tracking pattern exists in the first pulse of the multi-pulse long GRBs and some single-pulse GRBs, suggests that intensity tracking is an independent component, which may operate in some late pulses as well. For the GRBs with measured redshifts, we present a time-resolved E{sub p} - L{sub {gamma},iso} correlation analysis and show that the scatter of the correlation is comparable to that of the global Amati/Yonetoku relation. We discuss the predictions of various radiation models regarding E{sub p} evolution, as well as the possibility of a precessing jet in GRBs. The data pose a great challenge to each of these models, and hold the key to unveiling the physics behind GRB prompt emission.

Lu Ruijing; Wei Junjie; Liang Enwei; Lue Lianzhong [Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004 (China); Zhang Binbin [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Lue Houjun; Zhang Bing [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States); Lei Weihua, E-mail: lew@gxu.edu.cn, E-mail: zhang@physics.unlv.edu [School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)

2012-09-10T23:59:59.000Z

308

Scientific Awards  

Science Conference Proceedings (OSTI)

Nominations Scientific Awards Awards Program achievement aocs application award Awards baldwin distinguished division memorial nomination poster program recognizing research service ...

309

Fermi LAT Detection of Pulsed Gamma-Rays From the Vela-Like Pulsars PSR J1048-5832 and PSR J2229+6114  

SciTech Connect

We report the detection of {gamma}-ray pulsations ({ge}0.1 GeV) from PSR J2229+6114 and PSR J1048-5832, the latter having been detected as a low-significance pulsar by EGRET. Data in the {gamma}-ray band were acquired by the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope, while the radio rotational ephemerides used to fold the {gamma}-ray light curves were obtained using the Green Bank Telescope, the Lovell telescope at Jodrell Bank, and the Parkes Telescope. The two young radio pulsars, located within the error circles of the previously unidentified EGRET sources 3EG J1048-5840 and 3EG J2227+6122, present spin-down characteristics similar to the Vela pulsar. PSR J1048-5832 shows two sharp peaks at phases 0.15 {+-} 0.01 and 0.57 {+-} 0.01 relative to the radio pulse confirming the EGRET light curve, while PSR J2229+6114 presents a very broad peak at phase 0.49 {+-} 0.01. The {gamma}-ray spectra above 0.1 GeV of both pulsars are fit with power laws having exponential cutoffs near 3 GeV, leading to integral photon fluxes of (2.19 {+-} 0.22 {+-} 0.32) x 10{sup -7} cm{sup -2} s{sup -1} for PSR J1048-5832 and (3.77 {+-} 0.22 {+-} 0.44) x 10{sup -7} cm{sup -2} s{sup -1} for PSR J2229+6114. The first uncertainty is statistical and the second is systematic. PSR J1048-5832 is one of the two LAT sources which were entangled together as 3EG J1048-5840. These detections add to the growing number of young {gamma}-ray pulsars that make up the dominant population of GeV {gamma}-ray sources in the Galactic plane.

Abdo, A.A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U. /Stockholm U., OKC; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Baring, M.G.; /Rice U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Columbia U. /IASF, Milan /Milan Polytechnic /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /LPCE, Orleans /Montpellier U. /Stockholm U. /Stockholm U., OKC /INFN, Trieste /Bari U. /INFN, Bari /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U. /Bari U. /INFN, Bari /INFN, Trieste /Arecibo Observ. /Hiroshima U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Bari U. /INFN, Bari /INFN, Bari /NASA, Goddard /Maryland U. /INFN, Perugia /Perugia U.; /more authors..

2012-03-29T23:59:59.000Z

310

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

May May 23, 2003 Number 9 f Photo by Reidar Hahn I N S I D E : 6 A d d i n g H i s O w n S p i n 8 A G a l l e r y o f S k i l l s 1 0 N e w F u n d i n g R a i s e s Q u a r k N e t P r o f i l e 1 2 M e e t i n g S e a s o n PPD Record Symbolizes Safety Strides 2 It was a tight space. The technician, 29 years old, knelt down to reach for equipment at the Collider Detector at Fermilab. To see better, he turned around to grab his flashlight. Ouch. What seemed like a routine job ended in a twisted knee and a trip to the doctor's office. The injury was so severe that he needed surgery. The accident happened more than a year ago, on April 17, 2002. It is a reminder of the dangers that can lurk in even the most routine jobs. Yet that accident also cleared the way for an amazing record. Since the accident, more than 600 employees of the Particle Physics Division

311

fermi99-10-15  

NLE Websites -- All DOE Office Websites (Extended Search)

B A B A l l Yo u C a n B 4 H y p e r o n s a t t h e C r o s s r o a d s 6 C a b i b b o Ta k e s H i s P l a c e i n t h e Wo r l d 8 S t a t e S e n a t e H e a r i n g s 1 3 Ta l k o f t h e L a b Physics Conferences 10 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, October 15, 1999 Number 20 f Photo by Reidar Hahn Back in the mid-eighties, said Fermilab Director Mike Witherell, it was hard to get anyone working on the CDF and DZero experiments excited about B physics, the physics of mesons containing the bottom quark. He remembers being rebuffed when he tried to organize a session on the topic at a Snowmass Summer Study for high-energy physics. The dominant reaction was: hadron colliders (like FermilabÕs) canÕt do B physics, so why bother? That sentiment changed with the advent of silicon vertex detectors, tiny

312

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

11, 2003 11, 2003 Number 6 f Photo by Reidar Hahn I N S I D E : 6 S E S A M E 8 N o t e s f r o m U n d e r g r o u n d 1 2 F a r - R e a c h i n g R e s u l t s 'Grayfield' Project Has Silver Lining 2 'Grayfield' Project Has Silver Lining 2 2 FERMINEWS Friday, April 11, 2003 When it comes to buildings, whatever goes up must usually come down at some point. The question, at a national laboratory with constant budgeting concerns, is just how to tear down a building at the end of its useful life- and, even more important, how to pay for tearing down that building. But a current Fermilab project-the ongoing Technology Campus rehab program in the Fixed Target area-serves as a case study in how cooperation, creative funding from the U.S. Department of Energy, long-term planning and relatively new construction techniques allowed the lab, the environment and

313

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

4, 2002 4, 2002 Number 16 f I N S I D E : 2 P a r t i c l e D e t e c t i v e s A n n o u n c e F i r s t R e s u l t s 6 S t a r L i g h t , S t a r B r i g h t 1 0 M a k i n g a n I m p a c t 1 3 R e m e m b e r i n g T h o s e W h o S e r v e d 1 4 M i l e s t o n e s : Te v a t r o n L u m i n o s i t y R e c o r d Photos by Reidar Hahn 2 FERMINEWS Friday, October 4, 2002 Finding a particular person in a sold-out stadium can be a daunting task. You scan thousands and thousands of faces, many looking similar from far away. You might be looking for someone with dark hair - but are you sure your friend isn't wearing a hat today? If you remember the color of your friend's favorite jacket, your task may be easier. But what if he wears a different coat for a change? Or even worse, have you considered the possibility that he hasn't yet arrived at the stadium? Particle physicists face pretty much the same dilemma as they look for their

314

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

March 2004 March 2004 Number 3 f Photo by Reidar Hahn I N S I D E : 6 G o o d N e i g h b o r P o l i c y 8 T h e S e n s i t i v e G i a n t 1 0 D a n c e o f t h e P l a n e s 1 3 B u d g e t Ta l k s The Power of One 2 Plans and hopes for a Linear Collider chart a straight course toward unification. Globally, the Linear Collider has united scientific communities in the Americas, Europe and Asia in the vision of an underground high-energy facility some 25-30 miles in length, functioning from the outset as a truly cooperative world laboratory. Its mission: exploring the world of the fundamental particles and forces with unprecedented precision by colliding electrons and positrons at an unmatched energy of one trillion electron volts (1 TeV). Scientifically, the Linear Collider could bring physicists stealing to the borders of the realm of unification-and the Planck Scale, where relative distances

315

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

November 2003 November 2003 Number 15 f Photo by Fred Ullrich I N S I D E : 2 H a p p y A n n i v e r s a r y, Te v a t r o n ! 3 Tw e n t y Ye a r s a t t h e E n e r g y F r o n t i e r 6 Tw e n t y Ye a r s o f P h y s i c s a n d Te c h n o l o g y A c h i e v e m e n t s 8 1 9 8 3 - T h e Ye a r t h e Te v a t r o n C a m e t o L i f e 1 2 S u p e r c o n d u c t i n g M a g n e t s 1 4 C o l d , H a r d F a c t : N o Te v a t r o n W i t h o u t C r y o g e n i c S y s t e m SPECIAL ISSUE: TEVATRON AT 20 Happy I remember well waiting for news of the first beam from the Energy Doubler, later to be known as the Tevatron. I was working with a group of about 35 physicists writing a proposal to do the first high- statistics, low-background charm experiment using the new technology of silicon microstrip detectors. We planned to use the higher energy photon beam that could be made starting with 800 GeV protons from the Tevatron. The news in the summer of

316

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

inch of the process depends on 10 FERMINEWS Friday, July 25, 2003 Ray Hren and Jim Wendt were hired on a cold, snowy January day in 1968 when Fermilab (then the nascent...

317

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

31, 2003 31, 2003 Number 2 f Photo by Reidar Hahn I N S I D E : 2 C E R N R e c e i v e s F i r s t U . S . - B u i l t C o m p o n e n t f o r L a r g e H a d r o n C o l l i d e r 4 D Z e r o G o e s G l o b a l 8 N e w H e a d o f P r o g r a m P l a n n i n g 1 0 R e a c h i n g O u t : L e d e r m a n F e l l o w s B r i n g S c i e n c e t o t h e P u b l i c Professor Prairie 12 2 FERMINEWS Friday, January 31, 2003 GENEVA, Switzerland-In a milestone for global science collaboration, the European Organization for Nuclear Research (CERN) took delivery on Tuesday, January 21, of the first U.S.-built contribution to what will be the world's highest-energy particle accelerator. The superconducting magnet, built at the U.S. Brookhaven National Laboratory, will become a key component of the Large Hadron Collider (LHC). It is the first of several advanced accelerator elements the U.S. will provide

318

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

27, 2003 27, 2003 Number 11 f Fermilab Visual Media Services I N S I D E : 2 R u n I I S t a t u s a n d P r o s p e c t s 8 T h e P h y s i c s o f C o r k 1 0 M I N O S : L a s t P l a n e a t S o u d a n 1 2 T h e M a k i n g o f G e n i u s Cosmologist Michael Turner: Why Accelerators Matter 4 In mid-August, just a few weeks from now, CDF and DZero experimenters will present the first full round of Run II physics results at the Lepton-Photon Symposium at Fermilab. So far in Run II, we have delivered nearly twice the integrated luminosity of Run I, extending the physics reach of the experiments. Nonetheless, at this point, despite the very hard work and dedication of many talented people, the luminosity delivered to CDF and DZero has fallen below our initial plans and predictions for Run II. IMPROVING RELIABILITY AND QUALITY To maximize the Tevatron luminosity and hence the scientific potential of

319

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

24, 2002 24, 2002 Number 9 f I N S I D E : 2 Ti m e f o r C o m m u n i c a t o r s t o C a t c h U p 4 B e a m M e U p 8 T h o s e ' D a m ' B e a v e r s 1 4 F e r m i l a b A r t s S e r i e s Photo by Reidar Hahn DIGGING IN 10 DIGGING IN 10 Communicators Communicating particle physics in the 21 st century INTERACTIONS INTERACTIONS Respond online at www.fnal.gov/pub/ferminews/ interactions/index.html or send email to ferminews@fnal.gov TIME for Communicators If large collaborations can achieve one goal, why can't labs speak in harmony? TO CATCH UP 2 FERMINEWS Friday, May 24, 2002 MENLO PARK, Calif.-In high-energy physics, we are accustomed to dealing with paradoxes. We build huge detectors for tiny particles. Studying the infinitesimally small contributes to our understanding of the farthest reaches of the universe. But we have created for ourselves a paradox

320

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

18, 2002 18, 2002 Number 17 f I N S I D E : 2 U p W i t h P e o p l e 5 H e l p i n g H a n d s 1 2 L a b S c h o o l Photo by Reidar Hahn Prehistoric Artifacts Tell Fermilab's Heritage 8 UP UP 2 FERMINEWS Friday, October 18, 2002 Combine decades of cyber savvy with a grandmother's steadfast humanity, and the result is Vicky White, the new head of Fermilab's Computing Division. Not only did her formal remarks accepting the appointment emphasize her goal of making the division a caring place to work; her slides included a photo of her infant granddaughter as a symbol of the future, and she said her door was open if someone needed a hug. "People did find it very unusual for that kind of presentation," White said in her soft but distinct British accent, "but I've gotten nothing but good comments on it. One of my roles is to set the tone of the division, and

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

6, 2002 6, 2002 Number 20 f I N S I D E : 6 S u p e r R e s u l t s f o r S u p e r c o n d u c t i n g L H C M a g n e t s 8 H o w t o C a t c h a C o l d W I M P 1 2 C o o l I d e a Photo by Reidar Hahn First phase of NuMI construction complete 2 2 FERMINEWS Friday, December 6, 2002 At 219 feet, Wilson Hall is Fermilab's tallest building. It offers one of the longest elevator rides in the Fox Valley area: sixteen stories. Since November, Fermilab employees can take an even longer elevator ride. Construction workers have completed the installation of a new 30-story elevator. At the final stop, however, passengers won't get a view of Chicago's skyscrapers. Instead, passengers exit into a vast, windowless hall that could easily serve as a small cathedral. The 120-foot-long cavern, called the MINOS hall, is located 350 feet underground. In two years, it will host the Main Injector Neutrino Oscillation

322

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

February 14, 2003 February 14, 2003 Number 3 f Fermilab photo I N S I D E : 2 C r a c k i n g t h e N e u t r i n o C o d e 8 To u g h D a y s A h e a d w i t h F Y 0 4 S c i e n c e F u n d i n g 1 2 H i s t o r i c Tu r n s i n T h e W i n d m i l l C i t y First-Hand Account 6 2 FERMINEWS Friday, February 14, 2003 Neutrinos are everywhere. Capable of traversing the entire earth at close to the speed of light, these particles shine no light, and only very rarely does one of them interact with anything at all. Penetrating every corner of the universe, billions of neutrinos cross your body in a tiny fraction of a second. From its very beginning, Fermilab (originally called the National Accelerator Laboratory) has helped to unravel the secrets of these ghost-like particles. The first experiment at NAL, labeled E1A and proposed in June 1970, used neutrinos to search for a force-carrying particle called the W boson. Since

323

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

29, 2002 29, 2002 Number 6 f I N S I D E : 2 " D e a r M o n i c a . . . " 6 I n t e r a c t i o n s 1 2 B e s t F r i e n d s 1 4 C a l e n d a r Photo by Reidar Hahn Discovering the Invisible Universe 8 Discovering the Invisible Universe 8 Q 2 FERMINEWS Friday, March 29, 2002 Monica: What exactly is this force that causes electrons to be attracted to protons, but repelled by each other? Andreas: In the most basic theory of the force between charged objects, physicists view it as an exchange of photons. Photons are little particle-like ripples in the electromagnetic field. The idea is that an electron comes with an electric field (and, if it is moving, also a magnetic field). But this field is felt by other charged particles: we picture a photon leaving the electron and, a bit later, bumping into or being absorbed by another charge.

324

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

April 19, 2002 April 19, 2002 Number 7 f I N S I D E : 2 T H E Q u e s t i o n 6 T h e L a r g e r Vi e w 1 2 C o m m u t e r S p e c i a l 1 4 U p w a r d B o u n d Photo courtesy Iowa State University Learning and Growing 8 Learning and Growing 8 Question THE 2 FERMINEWS Friday, April 19, 2002 "What good is the information you're discovering?" Generations of particle physicists have grappled with this question, and many have attempted to address it, from various perspectives and with varying success. At a time when THE question is gaining insistence in the national dialogue on science policy, it may be useful to take another critical look at the reasons why we do particle physics research and how both we and others perceive its value for our nation and the world. by Judy Jackson To: Fermilab Public Affairs Subject:

325

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

28, 2002 28, 2002 Number 11 f I N S I D E : 2 S o T h i s P h y s i c i s t Wa l k s i n t o a B a r. . . 6 P o s t e r S e s s i o n : N e w P e r s p e c t i v e s 2 0 0 2 1 0 C o m e - F r o m - B e h i n d S u c c e s s 1 2 W h e n N o t h i n g M e a n s S o m e t h i n g Photo by Reidar Hahn Lederman at 80 8 So BAR... 2 FERMINEWS Friday, June 28, 2002 Picture your local watering hole. That's where the Department of Energy's Peter Rosen recommends field-testing the message of particle physics. Sidle up to "Joe and Janine Sixpack," Rosen suggests, and lay some neutrinos on them. If the skimpy little particles don't do it for the Sixpacks, see how they respond to superconducting magnet technology or the World Wide Web-whatever it takes to get the barroom buzzing over baryons. Potential pick-up lines from particle physics made Rosen's point about the

326

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

21, 2003 21, 2003 Number 5 f Photo by Reidar Hahn I N S I D E : 2 F r i e n d s o f F r i e n d s 6 U n i v e r s a l L a n g u a g e 8 F l a t S t a n l e y Vi s i t s F e r m i l a b 1 0 S p e c i a l D e l i v e r y 1 6 Te v a t r o n L u m i n o s i t y R e c o r d Science Returns to Meson Lab 12 Science Returns to Meson Lab 12 2 FERMINEWS Friday, March 21, 2003 Is there really a Big Dipper? That most famous of celestial signposts in the constellation Ursa Major, the Big Dipper is essentially a random distribution of stars that our eyes assemble into a pattern because that s what our eyes are designed to do. We see a string of lights across a dark background, and we draw a picture in the night sky. In three dimensions, we would have a different image: seven stars at divergent distances. The light reaching our eyes at any moment has departed these seven sources at scattered times. While the middle five stars (Merak,

327

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

October 2003 October 2003 Number 14 f Photo by Fred Ullrich I N S I D E : 2 P o i n t o f Vi e w : R u n I I I t 's Ti m e t o M o v e O n - To g e t h e r 5 F e r m i l a b To d a y L a u n c h e s R e s u l t o f t h e We e k 1 0 O n l y Y O U C a n A c h i e v e a S a f e S h u t d o w n 1 4 P r o f i l e i n P h y s i c s : D a n J o h n s o n M o v i n g U p - A n d A r o u n d Shutdown at Fermilab 6 TOGETHER Last month Fermilab Director Mike Witherell announced the cancellation of the CDF and DZero silicon detector upgrades for Run II. While not entirely unexpected, this announcement was a great disappointment to many of us. I have lost count of how many times I have been asked how I feel about this decision. This brief article is an attempt to answer that question. It's a very personal view, not an official statement of laboratory or experiment policy. I haven't made any attempt at spin control, and aspects of the drama are

328

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

Custard Tarts DINNER THURSDAY, APRIL 15 Mussel Placki Grilled Mongolian Lamb with Thai Curry Sauce and Tropical Mint Chutney Mixed Grilled Vegetables Kirsch and Tart Cherry...

329

Fermi Timing and Synchronization System  

E-Print Network (OSTI)

availability of a larger variety of components at 1550 nm, and perhaps more importantly, transmission

2006-01-01T23:59:59.000Z

330

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

Europe and Asia to northern Minnesota for the MINOS neutrino project, to southern Argentina for the Pierre Auger Observatory, to every part of the site, the reach of Material...

331

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

1972, when I was here as an employee of Cornell. The AEC had rejected a proposal for the remote handling of neutrino trains, and I needed to come up with a new proposal that was...

332

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

for which I am overdressed, and after which I call the lecturer (a very helpful Peter Shanahan) for more details. I ask him intelligent questions like, "What's with...

333

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

Companions Photo by Merilee Janusz FERMINEWS Friday, December 20, 2002 7 According to Peter Kasper, a Fermilab physicist and local bird expert, 2002 was the best year for...

334

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

14, 2002 3 "We're trying to understand the structure of matter," said Fermilab physicist Peter Cooper, the second spokesperson of the SELEX collaboration, which comprises 130...

335

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

members of the Illinois delegation, Reps. Bobby Rush (1st), Bill Lipinski (3rd), Danny Davis (7th), Jerry Weller (11th), Jerry Costello (12th), Tim Johnson (15th) and John...

336

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

experiment that is the first to test the "solar neutrino problem" (discovered by Ray Davis, Jr., one of this year's other Nobel laureates) entirely in the laboratory, also had...

337

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

of folksongs that are central to Latvia's cultural identity. Dr. Onno Purbo of Indonesia and his students are on a mission to create a national network of Internet cafes to...

338

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

club to adopt." The most moving letter may have come from Suhail Yusuf, Karachi, Pakistan, who sent a "Hello and Assalamu Alaikum" (Nov. 23, 2001). Inspired by the FERMINEWS...

339

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

in Lake Holiday, 2 bath, professionally landscaped, Sandwich Schools, large lot, 3 beaches, boating, fishing, water-skiing, low taxes. Available after April 1, 2002. 139,900....

340

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

became a Fellow of the Health Physics Society. The nomination was made by peers at other DOE accelerator laboratories. The designation, currently applied FOLK DANCING The...

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

need to understand is structure. Structure determines the properties of materials." The SNS, built by the Office of Science of the U.S. Department of Energy, will be the world's...

342

FermiNews - December 2003  

NLE Websites -- All DOE Office Websites (Extended Search)

December 2003 | Number 16 In This Issue: SNS: A Camera for Molecular Structures By-Line from the Frontlines The Incredible Shortness of Bunches Tracking Down Cosmic Rays Dark...

343

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

as alumni. Among prominent physicists, Rubin Braunstein, co-inventor of the light-emitting diode, is a graduate, as are Joel Lebowitz of Rutgers, Harvey Scher of the Weizman...

344

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

around the world have partnered with SLAC to use SPIRES as their own database. They can enter and access information directly through SPIRES, giving them complete control over...

345

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

the construction of a neutrino beamline at Fermilab is complete, the experiment will enter its next phase. Scientists will use the far detector to "catch" neutrinos created at...

346

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

The sighting of Weakly Interacting Massive Particles could solve the double mystery of dark matter on the cosmic scale and of supersymmetry on the subatomic scale. The CDMS II...

347

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

26; Mexico, 21; Switzerland, 13; Czech Republic, 12; The Netherlands, 12; Sweden, 11; Greece, 7; Colombia, 6; Spain, 6; Byelarus, 4; Finland, 4; Vietnam, 4; Israel, 3; Poland, 3;...

348

Fermi 3/29/02  

NLE Websites -- All DOE Office Websites (Extended Search)

February 2004 February 2004 Number 2 f Photo by Reidar Hahn I N S I D E : 2 D Z e r o B r e a k s N e w G r o u n d i n G l o b a l C o m p u t i n g E ff o r t s 6 " D o Yo u F e e l We l c o m e i n t h e U n i t e d S t a t e s ? " 8 N L C C o l l a b o r a t i o n R e a c h e s C r i t i c a l G o a l 1 4 Vo l u n t e e r s F o s t e r F e r m i l a b - S c i Te c h P a r t n e r s h i p A New Layer of Sensitivity 11 FERMINEWS February 2004 3 programs relied on the theoretical design of the DZero detector rather than its real-world performance. "The new algorithm is based on our knowledge of how well we put the detector together," said Dugan O'Neil, one of the DZero scientists working with the WestGrid in Vancouver, Canada. "This has dramatically improved our efficiency of finding particle tracks." The collaboration also has adopted the new algorithm to process all new experimental data.

349

Society Awards  

Science Conference Proceedings (OSTI)

Awards for long-term service to the Society. Society Awards Awards Program achievement aocs application award Awards baldwin distinguished division memorial nomination poster program recognizing research service A. Richard Baldwin Award aocs awar

350

Direct evidence of the fermi-energy-dependent formation of Mn interstitials in modulation doped Ga1-yAlyAs/Ga1-xMnxAs/Ga1-yAlyAs heterostructures  

SciTech Connect

Using ion channeling techniques, we investigate the lattice locations of Mn in Ga{sub 1-x}Mn{sub x}As quantum wells between Be-doped Ga{sub 1-y}Al{sub y}As barriers. The earlier results showed that the Curie temperature T{sub C} depends on the growth sequence of the epitaxial layers. A lower T{sub C} was found in heterostructures in which the Ga{sub 1-x}Mn{sub x}As layer is grown after the modulation-doped barrier. Here we provide direct evidence that this reduction in T{sub C} is directly correlated with an increased formation of magnetically inactive Mn interstitials. The formation of interstitials is induced by a shift of the Fermi energy as a result of the transfer of holes from the barrier to the quantum well during the growth.

Yu, K.M.; Walukiewicz, W.; Wojtowicz, T.; Lim, W.L.; Liu, X.; Dobrowolska, M.; Furdyna, J.K.

2004-01-30T23:59:59.000Z

351

Professional Awards  

Science Conference Proceedings (OSTI)

AOCS presents Society, Scientific, Division/Section and Best Paper awards to recognize accomplishments by individuals in the realm of fats, oil, and related materials. Professional Awards Awards Program achievement aocs application award Awards ba

352

TMS Honors and Awards  

Science Conference Proceedings (OSTI)

Sep 1, 2013 ... TMS Honors and Awards Recognition Program. All Awards. Society Awards. Division Awards. Young Leader Awards. Student Awards.

353

2013 Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Awards 2013 Awards Print Monday, 08 July 2013 10:17 banner Home Agenda Awards Exhibitors Lodging Posters Registration T-Shirt Contest Transportation Workshops Contact Us User...

354

Award Types  

NLE Websites -- All DOE Office Websites (Extended Search)

nuclear deterrent; reduce global threats; and solve other emerging national security and energy challenges. Contact Awards Team (505) 667-7824 Email Types of Awards The Awards...

355

Award Winners  

Science Conference Proceedings (OSTI)

AOCS honors those individuals and teams who have have received awards from the Society. Award Winners Membership Information achievement application award Awards distinguished division Divisions fats job Join lipid lipids Member member get a membe

356

Awards Presentation  

Science Conference Proceedings (OSTI)

University of Utah. TMS & AIME Awards Presentation ? February 17, 2009 ? San Francisco, California, USA. ACTA Materialia Materials and Society Award.

357

Student Awards  

Science Conference Proceedings (OSTI)

listing, contact information Student Awards Student Membership achievement aocs application award awards distinguished division fats global group inform job listings member Membership memorial network nomination oils poster program recognizing res

358

Awards and Best Practices  

NLE Websites -- All DOE Office Websites (Extended Search)

Practices I. Sustainability Awards Award Information 2012 Award Winners Search Awards Database (2007-2012) 2006 Awards Overview of DOE Award Process DOE encourages its sites to...

359

Awards - CECM  

E-Print Network (OSTI)

Awards. ... Awards. (May 1999) Received President's Ph.D. Research Stipend at SFU. (May 1994) Received Graduate Fellowship at SFU for finite difference ...

360

2013 Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Awards Print banner Home Agenda Awards Exhibitors Lodging Posters Registration T-Shirt Contest Transportation Workshops Contact Us User Meeting Archives Users' Executive Committee...

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Lists of NERSC Awarded Projects  

NLE Websites -- All DOE Office Websites (Extended Search)

NIM (NERSC Information Management portal) Awarded projects 2013 Awards 2012 Awards NISE 2012 Awards Data 2012 Awards 2011 Awards NISE 2011 Awards Previous Year Awards Policies...

362

TMS Honors and Awards: Search Awards  

Science Conference Proceedings (OSTI)

Other Awards. SEARCH AWARDS. Use the search feature to look for award winners and/or text related to award winners such as citations and quotes.

363

Ernest 0. Lawrence, 1957 | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

About Honors and Awards Ernest 0. Lawrence, 1957 The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates 2000's 1990's 1980's 1970's 1960's...

364

Conventional and Stuffed Bergman-Type Phases in the Na-Au-T (T=Ga, Ge, Sn) Systems: Synthesis, Structures, Coloring of Cluster Centers, and Fermi Sphere - Brillouin Zone Interactions  

SciTech Connect

Bergman-type phases in the Na?Au?T (T = Ga, Ge, and Sn) systems were synthesized by solid-state means and structurally characterized by single-crystal X-ray diffraction studies. Two structurally related (1/1) Bergman phases were found in the Na? Au?Ga system: (a) a conventional Bergman-type (CB) structure, Na26AuxGa54?x, which features empty innermost icosahedra, as refined with x = 18.1 (3), Im3?, a = 14.512(2) Ĺ, and Z = 2; (b) a stuffed Bergman-type (SB) structure, Na26AuyGa55?y, which contains Gacentered innermost icosahedra, as refined with y = 36.0 (1), Im3?, a = 14.597(2) Ĺ, and Z = 2. Although these two subtypes have considerable phase widths along with respective tie lines at Na ? 32.5 and 32.1 atom %, they do not merge into a continuous solid solution. Rather, a quasicrystalline phase close to the Au-poor CB phase and an orthorhombic derivative near the Au-rich SB phase lie between them. In contrast, only Au-rich SB phases exist in the Ge and Sn systems, in which the innermost icosahedra are centered by Au rather than Ge or Sn. These were refined for Na26Au40.93(5)Ge14.07(5) (Im3?, a = 14.581(2) Ĺ, and Z = 2) and Na26Au39.83(6)Sn15.17(6) (Im3?, a = 15.009(2) Ĺ, and Z = 2), respectively. Occupations of the centers of Bergman clusters are rare. Such centering and coloring correlate with the sizes of the neighboring icosahedra, the size ratios between electropositive and electronegative components, and the values of the average valence electron count per atom (e/a). Theoretical calculations revealed that all of these phases are Hume?Rothery phases, with evident pseudogaps in the density of states curves that arise from the interactions between Fermi surface and Brillouin zone boundaries corresponding to a strong diffraction intensity.

Lin, Qisheng; Smetana, Volodymur; Miller, Gordon J.; Corbett, John D

2012-08-03T23:59:59.000Z

365

11Fermi 2/19/99  

NLE Websites -- All DOE Office Websites (Extended Search)

Hawking Ponders Infinity Hawking Ponders Infinity ÒCAN YOU HEAR ME?Ó A substantial baritone, round and full; the accent borderline Scottish or Welsh, but schooled well short of a full brogue. A hint of wry in the tone, promising a barb or two before the nightÕs work was done. The voice immediately owned every expanse of the Arie Crown Theater at McCormick Place, ChicagoÕs gargantuan convention center by the lake. But who owned the voice? A motorized wheelchair rested at center stage, life support apparatus stacked behind the wheels, its inhabitant almost too still for reality. His head leaned unmoving against his right shoulder, his skeletal body angled in the chair like an oddly-bent wire coathanger. In front of him was a small custom computer console, where a minute twitch of his finger

366

8Fermi 5/14/99  

NLE Websites -- All DOE Office Websites (Extended Search)

G G e t t i n g P h y s i c a l 6 L o v e o f C o u n t r y 7 P e d a l t o t h e M e t a l 8 N o S u n , S t i l l F u n 1 0 P a r k i n g R e d u x 1 2 H o w Õs Wo r k 1 3 Ta l k o f t h e L a b The Final Goal 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, May 14, 1999 Number 10 f Photo by Reidar Hahn After nearly a decade of planning and building and fixing, of taking an idea and turning it into two miles of machine, all those connected with the Fermilab Main Injector anticipated the shining moment when the nearly-$230- million accelerator could be declared completed and ready for operation. That moment came on Wednesday, April 28, when a U.S. Department of Energy Project Acceptance review recommended that DOE confirm Critical Decision 4: Operation of the Main Injector. And once they got their view of the Promised Land, all those involved with the

367

9Fp Fermi 2/11/00  

NLE Websites -- All DOE Office Websites (Extended Search)

J J a n e M o n h a r t 8 S a f e t y R e c o r d K e e p s I m p r o v i n g 1 0 G u i d e t o W i l s o n H a l l C o n s t r u c t i o n 1 3 Ta l k o f t h e L a b Shutdown marks end of era for 800 GeV fixed-target program 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 23 Friday, February 11, 2000 Number 3 f Fermilab Photo by Mike Perricone It was an era of great growth, sometimes instantaneous growth. ÒOne of my fondest memories is of becoming an extraction expert,Ó said Roger Dixon, whose Fermilab career began in the Switchyard, extracting beam from the old Main Ring and sending it to the fixed-target experimental areas, a quarter-century ago or thereabouts. About two months into his Lab career, Dixon received a 3 a.m. call at home. There was a beam problem. He jumped into his car and sped to the Lab. ÒWhen I arrived,Ó he recalled, ÒI was

368

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

23, 2001 23, 2001 Number 19 f I N S I D E : 4 " B u t E n o u g h A b o u t H i g h E n e r g y P h y s i c s ... " 1 0 L a b M a k e s t h e N u m b e r s A d d U p 1 2 A f t e r g l o w s , T h e H a r d Wa y ICRR (Institute for Cosmic Ray Research), The University of Tokyo Rebuilding at Super-K 2 The implosion of thousands of light detectors inside the Super-Kamiokande experiment on November 12 rattled the particle physics community around the world. The accident at the Kamioka Observatory, an underground laboratory in Kamioka, Japan dedicated to neutrino research, devastated more than half of the 11,146 photomultiplier tubes inside the cylindrical, 41-meter high Super-Kamiokande chamber. The destruction presents a major setback in unraveling the secrets of a ghost-like particle called the neutrino. The Super-Kamiokande collaboration, consisting of scientists from Japan and

369

12p Fermi 5/4/01  

NLE Websites -- All DOE Office Websites (Extended Search)

4, 2001 4, 2001 Number 8 f I N S I D E : 2 E n g i n e e r i n g F e r m i l a b 4 E n g i n e e r i n g R u n I I 1 0 E n g i n e e r i n g t h e Wo r k p l a c e 1 2 E n g i n e e r i n g N e u t r i n o s 1 5 E n g i n e e r i n g t h e F u t u r e 1 8 Q u a r k N e t Vi d e o N e w s : L i v e o n t h e I n t e r n e t E N G I N E E R I N G I S S U E 2 FERMINEWS May 4, 2001 Saying that engineering contributes to physics is like saying that water can be helpful to fish. Without engineering, physics would not be physics. What makes physics a science, and not mere speculation about how the world might work, is experiment; and to make an experiment takes engineering. Before Galileo could drop anything, somebody had to build that tower. The nucleus did not appear to Rutherford in a vision. The top quark was only a theorist's vaporous construct until the Tevatron made it, and CDF and DZero saw it. Physicists need tools. Engineers design and build them.

370

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

5, 2002 5, 2002 Number 5 f I N S I D E : 6 W i n e R e t u r n s t o W i n e a n d C h e e s e 8 A N e w G e n e r a t i o n o f S u p e r c o m p u t e r s 1 2 A F o o t i n T h e D o o r 1 4 Ta l k o f t h e L a b Photo by Jenny Mullins USERS: Fermilab Wouldn't Be the Same Without Them 2 2 FERMINEWS Friday, March 15, 2002 They're called "users," but Fermilab's guest and visiting scientists are woven inextricably into the fabric of the laboratory. In fact, users often represent the fabric of the laboratory as distinctively as many full-time and long-term researchers, and their official description comes as something of a surprise. They might be guests, but Fermilab has been their home for a long time. Just a couple of examples: Harry Weerts of DZero and Vaia Papadimitriou of CDF, both longstanding integral members of the large detector experiments.

371

11Fermi 4/30/99  

NLE Websites -- All DOE Office Websites (Extended Search)

H H a z a r d A n a l y s i s 8 S p r i n g A r o u n d t h e R i n g 1 0 R O O T C o m p u t e r L a n g u a g e 1 3 Ta l k o f t h e L a b Fixed Target 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, April 30, 1999 Number 9 f Photo by Reidar Hahn HyperCP Asked what the scientists who rely on FermilabÕs accelerators want most from the Laboratory, Patricia McBride, a scientist herself, once said, ÒBeam, beam and more beam.Ó When the Tevatron cranks up again, two fixed-target experiments will get under way and the scientists involved should be delighted. The Tevatron will be running at 40 percent of its 1997 intensityÑabout all the intensity the two experiments can handle. But theyÕll be getting 1.5 times more beam, enabling experimenters to collect more data with better statistics for deeper insights into the way matter is put together and falls apart.

372

8p Fermi 8/20/99  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermilab-Serving Researchers, Fermilab-Serving Researchers, Serving Science 8 Future Cool 10 How Hot Was It? 13 Talk of the Lab Keeping Fermilab Cool 6 F E R M I L A B A U .S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, August 20, 1999 Number 16 f Photo by Reidar Hahn "A high-energy accelerator is like the 'Field of Dre a m s, ' " s a i d a F e r m i l a b p h y s i c i s t . "I f you bu i l d i t , they will come. " A nd, indeed, they have. According to the latest statistics, more than 2,000 physicists and graduate students from nearly 200 research institutions in the U.S. and around the world come here to advance the understanding of the building blocks of matter. They are called "users" in the Fermilab vernacular. From its inception, Fermilab was intended to be a "truly national" laboratory

373

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

in recent years, has been hard pressed to maintain its leading edge. Straitened federal funding for U.S. particle physics, and indeed for all of the physical sciences, has left...

374

25Fermi 1/8/98 lay  

NLE Websites -- All DOE Office Websites (Extended Search)

however, in high energy particle physics. I have toured Fermilab. My close friend Noah Wallace (who is a physicist and does work at Fermilab) has undertaken the herculean...

375

FermiNews - November, 9 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

Surprises Fermilab Physicists Ready for Years to Come: New Equipment Saves Energy and Money Frogs Come-A-Countin': Survey offers enviromental clues anlng with numbers NSF Grant...

376

FermiNews - April 25, 2003  

NLE Websites -- All DOE Office Websites (Extended Search)

25, 2003 | Number 7 In This Issue: Quiet: Librarians at Work Career Building Money, Science and History Interactions: Why Fundamental Research with Particle Accelerators? Calendar...

377

FermiNews - April 13, 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

April 13, 2001 | Number 7 In This Issue: Superconductivity:How much can we imagine? TESLA by Taxi Fermilab Contributes to TESLA Pedal to the Metal for New Superconducting Materials...

378

FermiNews - March 7, 2003  

NLE Websites -- All DOE Office Websites (Extended Search)

4 In This Issue: A Visit to Tsukuba CDF Approves First Run II Paper DESY Gets OK on TESLA X-Ray Laser Good-bye, Budget Codes Good Neighbor Policy Calendar and Milestones...

379

FermiNews - March 16, 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

16, 2001 | Number 5 In This Issue: The Odds of Discovery Martha Heflin: She's on Your Side Making the Cut NICADD Strengthens Fermilab Bond with NIU Quarknet Video News Project...

380

FermiNews - February 16, 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

16, 2001 | Number 3 In This Issue: Einstein's Smile Makeover Tollestrup Looks Beyond the Next Step Lights Camera Quarknet A Student's View: From Intimidation to Inspiration And...

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

17 Fermi 6/8/01  

NLE Websites -- All DOE Office Websites (Extended Search)

8, 2001 8, 2001 Number 10 f Photo by Fred Ullrich I N S I D E : 6 L e h m a n C o m m i t t e e R e v i e w s N u M I P r o j e c t 1 0 C h e z L ĂŠ o n , t h e P e o p l e 's C h o i c e 1 2 P r a g u e S c i e n t i s t s C h e c k i n a t F e r m i l a b User Demographics 2 2 FERMINEWS June 8, 2001 by Judy Jackson Alabama sends three; Poland four. Two hundred and thirty four come from Italy, 63 from Pennsylvania and 150 from California. There's one apiece from Ecuador, Slovakia and Turkey. Russia and New York are about equal, with 185 and 171, respectively. As Run II begins in the spring of 2001, Fermilab's users come to Batavia from universities and laboratories the world over to work on experiments at the energy frontier. Of the total number of 2,528 users, 1,579 come from 100 institutions in 34 states. The remaining 949 are from 104 foreign institutions in 26 countries. Interestingly,

382

10 Fermi 6/1/99  

NLE Websites -- All DOE Office Websites (Extended Search)

t Ta t Ta k e s a L a b o r a t o r y 6 B u i l d i n g t h e M a i n I n j e c t o r 8 M a i n I n j e c t o r 1 0 O n Ti m e , O n B u d g e t 1 2 T h e R u n d o w n o n t h e M a i n I n j e c t o r 1 4 T h e S c i e n c e o f R u n I I F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Tuesday, June 1, 1999 Number 11 f Photo by Reidar Hahn S P E C I A L I S S U E MAIN INJECTOR Rome wasnÕt built in a day, and neither was the Main Injector. It took seven long years of planning, designing, estimating, calculating, budgeting, digging, razing, connecting, guiding, and finetuning to pull together the $260-million machine that will usher in a new era of particle physics at Fermilab. Needless to say, no one person took the project from dream to finish. Raising the Main Injector was the work of an army of Laboratory personnel Ñmanagers and technicians, secretaries and physicists, truckers and

383

13Fermi 1/22/99 lay  

NLE Websites -- All DOE Office Websites (Extended Search)

The Run II Equation The Run II Equation There has been intense speculation here at Fermilab about the potential for discovering new and interesting physics when the Tevatron cranks up again. Al Goshaw, cospokesperson for the CDF collaboration and a particle physicist from Duke University, in North Carolina, isnÕt content with mere speculation. As a scientist, he has it all worked out inÑwhere else?Ñan equation. Physics Potential in the Next Decade at CDF = [Run I Physics] x A x D x E x I where A = accelerator improvements; D = detector upgrades; E = experience with analysis; and I = inspiration. Goshaw has even come up with some numbers. Accelerator improvements include an increase in luminosity, with many more collisions per second, and an increase in the production of top quarks and other elusive fundamental particles.

384

5Fermi 11/19/99  

NLE Websites -- All DOE Office Websites (Extended Search)

F F o l l o w t h e P a r t i c l e s : H o w t o M a k e a N e u t r i n o B e a m 6 M u o n S t o r a g e R i n g s 8 A S o u t h e r n G e n t l e m a n R e t i r e s 1 4 Ta l k o f t h e L a b Minding Our Business 10 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, November 19, 1999 Number 22 f Photo by Reidar Hahn Nobel laureate Frederick Reines, the neutrinoÕs first observer, described this elusive subatomic particle as Òthe most tiny quantity of reality ever imagined by a human being.Ó Neutrinos are so asocial and secretive that their properties have evaded a thorough understanding by physicists ever since their prediction in 1930 by Wolfgang Pauli, and even following its discovery in 1955 by Reines and Clyde Cowan. Despite tantalizing results more than a year ago from JapanÕs Super Kamiokande experiment, physicists still havenÕt conclusively demonstrated

385

10p Fermi 7/2/99  

NLE Websites -- All DOE Office Websites (Extended Search)

C C o n s t r u c t i n g a L e g a c y 1 0 W i t h e r e l l S t a r t s Wo r k 1 2 R i g h t O n Ta r g e t 1 4 Ta l k o f t h e L a b Parting Words 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, July 2, 1999 Number 13 f Photo by Reidar Hahn Director John Peoples sat quietly as his life and career at Fermilab were toasted and roasted at the June 10 symposium held in his honor, but then his turn came to reflect on the best of his 10 years at the Laboratory. With his party about to get started, and barbecue and sparkling grape juice awaiting guests in the atrium, Peoples promised to keep his remarks Òdown to eight hours.Ó He launched into a narrative about the birth of the Recycler, and ended up paying his respects to the entire Fermilab staff. ÒIt would be nice to get a few things down for history,Ó he said.

386

14Fermi 4/16/99  

NLE Websites -- All DOE Office Websites (Extended Search)

Rate Rate U.S. Postage P A I D Bartlett, IL Permit No. 146 CLASSIFIEDS FOR SALE s Õ87 Bonneville, orig 72K miles, loaded, moonroof, leather, good condition, needs some body work. $1,500. Carolyn Hines, x3788 or chines@fnal.gov. s Õ84 Toyota Camry, auto, 4 dr sedan, 116K miles, $700 obo. Call Colleen, x8887. s Õ71 Volkswagen square back, great collectorÕs car, good tires, brakes & Y2K compliant cooling system. $1,000 obo. Call x4364 or JudyU51@AOL.COM. s 19" Portland color TV remote ready but remote missing $45. US Divers Wet Suit Black $50; Parkway divers vest type buoyancy compensator w/auto-inflate $75. Atomic Arc Carbon Skis (195) w/bindings, ski bag, poles, size 12 boots, $150; king size Oak waterbed frame needs mattress $50; Elvis collector plates (4) $20 ea; 2 old

387

8 Fermi 3/24/00  

NLE Websites -- All DOE Office Websites (Extended Search)

G G e n e r a l H a b i g e r Vi s i t s F e r m i l a b 8 M a p p i n g t h e M a i n I n j e c t o r 1 0 B i g g e r T h a n L i f e 1 3 L e t t e r s t o t h e E d i t o r F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 23 Friday, March 24, 2000 Number 6 f Photo by Reidar Hahn HEPAP confronts funding crunch 2 by Judy Jackson Like a spring that can be stretched only so far and still bounce back, the U.S. High Energy Physics program has reached the limit of budget stretching before irrevocable changes threaten its capacity for world-leading science. That was the message that members of the Department of EnergyÕs High Energy Physics Advisory Panel heard from speaker after speaker at HEPAPÕs spring meeting, held at Fermilab on March 9 and 10. Paradoxically, at a time when long-straitened budgets for basic science in the United States are facing the best funding prospects in many years, the

388

9 Fermi 3/10/00  

NLE Websites -- All DOE Office Websites (Extended Search)

i i n P l a i n E n g l i s h 6 P h y s i c s o n t h e A i r 1 0 P h y s i c s i n P r o g r e s s 1 3 Ta l k o f t h e L a b Physics in the Snow 8 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 23 Friday, March 10, 2000 Number 5 f Photo by Reidar Hahn by Judy Jackson Communicating physics is like the weather in Mark TwainÕs well-worn phrase: everybody talks about it, but nobody does anything about it. In the case of physics, however, there are a few exceptions. One of the most sustained efforts to translate the arcane language of particles, probabilities and picobarns into language the rest of us can more or less understand comes from FermilabÕs DZero experiment. In 1997, the collaboration launched ÒPlain English Physics,Ó DZeroÕs commitment to explain their experiment and its scientific results in simple

389

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

, 2002 , 2002 Number 2 f I N S I D E : 6 S c i e n c e F i n d s a Wa r m S m a l l -To w n We l c o m e i n M a l a r g Ăź e 8 H i g h S c h o o l s J o i n t h e S e a r c h f o r M o s t E n e r g e t i c P a r t i c l e s i n t h e U n i v e r s e 1 2 P a i n l e s s P h y s i c s : A P a r t i c l e D i a l o g u e Photo by Reidar Hahn Recycling Antimatter Becomes Reality 2 2 FERMINEWS February 1, 2002 Antimatter is arguably the rarest stuff Mother Nature provides here on earth. Created in high-energy particle collisions, antiparticles quickly disappear by reacting with ordinary matter. Using powerful accelerators, physicists have learned to produce and control tiny amounts of antimatter. The yield, however, is less than a microgram per year, and antiparticles remain a precious commodity. Scientists at Fermilab are now taking a new approach to satisfy the ever- increasing demand for antimatter: they will recycle antiprotons. To maximize

390

10Fermi 10/6/00  

NLE Websites -- All DOE Office Websites (Extended Search)

6, 2000 6, 2000 Number 17 f Photo by Reidar Hahn I N S I D E : 2 C D F O n a R o l l 6 T h i s i s Yo u r L i f e , B o b a n d C a t h y 8 C D F S n a p s h o t 1 0 D i a l 1 - 6 3 0 - C A B L E M E 1 2 C D F S t e p s U p t o t h e P l a t e 1 4 Ta l k o f t h e L a b A L L - C D F I S S U E WITH FLIP- BOOK 2 FERMINEWS October 6, 2000 by Kurt Riesselmann In a major milestone for particle physics, the Collider Detector at Fermilab collaboration rolled the heart of its 5,500-ton detector into the Tevatron beamline on September 9 to begin a Òcommissioning runÓ for testing the thoroughly revamped apparatus. The roll-in marks a new stage in preparations for Collider Run II of the Tevatron. When Run II officially begins in March 2001, the 500-member CDF collaboration, along with an equal number of colleagues across the Tevatron at the DZero detector, will take up the search for new physics

391

11Fermi 2/19/99  

NLE Websites -- All DOE Office Websites (Extended Search)

T T h e Wa y I S e e I t : A l v i n To l l e s t r u p 6 D e s i g n s f o r P h y s i c s 1 0 C e n t r a l U t i l i t y B u i l d i n g U p g r a d e 13 T h e Ta l k o f t h e L a b Word from Washington 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, February 19, 1999 Number 4 f Photos by Jenny Mullins Washington, D.C.ÑOn February 4, in the wood-paneled Lecture Room of the National Academy of Sciences, representatives of universities and research institutions gathered to hear officials of the Clinton administration discuss details of the PresidentÕs $1.77-trillion budget for fiscal year 2000 and its designs for science. The occasion was the annual meeting and policy forum of Universities Research Association, Inc., a not-for-profit consortium of research universities that serves as a contractor to the U.S. Department of Energy for the

392

Fermi National Accelerator Laboratory July 2012  

NLE Websites -- All DOE Office Websites (Extended Search)

July 2012 July 2012 Experiments have observed a new particle consistent with the long-sought Higgs boson. Now the exciting work of understanding its significance begins. What is a Higgs boson? What is a Higgs field? What is a Higgs boson? The Higgs field is like a giant vat of molasses spread throughout the universe. Most of the known types of particles that travel through it stick to the molasses, which slows them down and makes them heavier. The Higgs boson is a particle that helps transmit the mass-giving Higgs force field, similar to the way a particle of light, the photon, transmits the electromagnetic field. How long have physicists been looking for the Higgs boson? More than two decades. It started with the LEP experiments at CERN in the 1990s, continued with the Tevatron experiments at Fermilab

393

9 Fermi 12/1/00  

NLE Websites -- All DOE Office Websites (Extended Search)

, 2000 , 2000 Number 20 f Photo by Reidar Hahn I N S I D E : 5 S i l i c o n @ F e r m i l a b : P a s t a n d F u t u r e 8 L E P S h u t d o w n T h r o w s S p o t l i g h t o n F e r m i l a b 11 Ô D e s p e r a t e R e m e d y Õ H i t s t h e B i g S e v e n - O 1 2 N o r t h e r n L i g h t s 1 4 Ta l k o f t h e L a b SiDet Adds Precision 2 SiDet Adds Precision 2 FERMINEWS December 1, 2000 by Kurt Riesselmann They wear special clothing. They work with special machines. And they have special skills. Employees at FermilabÕs Silicon Detector facility must have the Òright touch.Ó Dropping a screw or making a wrong move can destroy a dayÕs workÑ or even more. Operating expensive precision machines and handling delicate silicon wafers are a large part of their daily work. And on top of it all, they need to finish their projects on time. With Collider Run II just around the corner,

394

7p Fermi 1/19/01  

NLE Websites -- All DOE Office Websites (Extended Search)

January 19, 2001 January 19, 2001 Number 1 f Illustration courtesy of SLAC I N S I D E : 5 C M S : C o p p e r C o l o s s u s 8 M o v i n g I n f o r a C l o s e r L o o k 1 0 P r o t o n s A g a i n s t C a n c e r 1 4 A n n o u n c e m e n t s The Story of BABAR and the BÕs 2 TM 2 FERMINEWS January 19, 2001 By Judy Jackson M uch of the buzz in particle physics these days comes from BÕs. More specifically, from BÕs and B-bars. ThatÕs because experiments studying these particlesÑB mesons and their antimatter counterparts, anti-B mesonsÑare on the verge of generating dramatic new insights into the enigmatic asymmetry between matter and antimatter. The buzz will reach a crescendo when the Stanford Linear Accelerator CenterÕs BABAR collaboration announces major new results at physics conferences next month. ÒWeÕve already written the paper; we just have to fill in the numbers,Ó said

395

Fermi National Accelerator Laboratory September 2012  

NLE Websites -- All DOE Office Websites (Extended Search)

2 2 Tritium, which has a half-life of 12.3 years, is an expected byproduct of accelerator operations at Fermilab. As part of our environmental monitoring program, we regularly sample the water discharged into the creeks on site and report the results to the Illinois Environmental Protection Agency, as required by state regulations. We also regularly test the water in the sanitary sewers. The low levels of tritium found since 2005 in Indian Creek, some Fermilab ponds and the sanitary sewers are far lower than the standards Fermilab is required to meet. They pose no threat to human health or the environment. Fermilab is committed to go beyond merely satisfying the regulatory standards. We strive to keep the tritium discharges as low as reasonably achievable, keep the public fully informed, and engage

396

Fermi National Accelerator Laboratory September 2013  

NLE Websites -- All DOE Office Websites (Extended Search)

September 2013 September 2013 Things to Do at Fermilab Welcome to Fermilab, the country's only Department of Energy laboratory dedicated to particle physics. The public areas of our 6,800-acre site are open from 8 a.m. to 6 p.m. from November to March, and from 8 a.m. to 8 p.m. the rest of the year. A photo ID is all you need to enter the Fermilab site. Just tell the guard at the gate the purpose of your visit. You're welcome to roam the public areas, visit our herd of buffalo, fish in our ponds (with a valid Illinois fishing license) and take photographs. Be sure to pick up a Visitor's Guide and Map, avail- able at the front desk in Wilson Hall, for valuable information about the site and its natural areas. If you want to experience more of what Fermilab is all about, here are some suggestions for you.

397

Fermi National Accelerator Laboratory February 2013  

NLE Websites -- All DOE Office Websites (Extended Search)

February 2013 February 2013 Fermilab and the Community STEM Educational Contributions Fermilab partners with educators to introduce youth to the world of science and trains college and university students in high-tech research and development. K-12 students FY2011 FY2012 K-12 teachers FY2011 FY2012 Statistics Students participating 16,665 19,101 in activities at Fermilab Students visited in 19,393 19,501 classrooms by Fermilab staff Educators attending 339 327 workshops at Fermilab Educators using the 292 139 Teacher Resource Center Teachers holding 22 9 summer research internships Ph.D. degrees received 1,961 since 1974 from work at Fermilab Students involved in About 1,000 every year on-site programs or internships Public tour participants 5,800 in 2012

398

11Fermi 2/19/99  

NLE Websites -- All DOE Office Websites (Extended Search)

FERMINEWS FERMINEWS February 19, 1999 Sonal Saghani of Chicago envisioned a concert series demonstrating the relationship of music to science, focusing on the physics of sound, including physicists as guest lecturers explaining the connections. She chose a music magazine, The Strad, whose readers are mostly female, in their 20s and 30s. Take a fresh look at PA RT I C L E P H Y S I C S. FERMINEWS February 19, 1999 9 Ling Yang of Ann Arbor, Michigan, incorporated the sculpture and unusual structures of the Lab into a feature article for Architectural Digest. The magazineÕs readers (median age 43, with 54% college graduates) are not primarily architects, she noted, but they do have a pronounced appreciation for design, color and aesthetics. by Mike Perricone When itÕs fully operational, the upgraded control room of FermilabÕs Central

399

15Fermi 2/5/99 lay  

NLE Websites -- All DOE Office Websites (Extended Search)

M M a i n I n j e c t o r Õs F i n a l G o a l 9 P r o f i l e : G r e g L a w r e n c e 1 0 S a f e t y F o c u s 1 2 J a p a n e s e P h y s i c s Aw a r d 13 T h e Ta l k o f t h e L a b First Sign of CP Violation in BÕs 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, February 5, 1999 Number 3 f Illustration by Tracy Ellyn On February 5, after more than a year of painstaking analysis of data collected from particle collisions in the Tevatron, CDF scientists cautiously reported finding Òtantalizing,Ó although not yet Òironclad,Ó evidence of CP violation in neutral B mesonsÑ a phenomenon that could help explain why matter reigns in our universe and antimatter has virtually disappeared. Although CP violation, a slight asymmetry in the behavior of matter and antimatter, was discovered 35 years ago, in particles called neutral K

400

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

, 2002 , 2002 Number 4 f I N S I D E : 2 Te v a t r o n L u m i n o s i t y M a k e s a n U p h i l l C l i m b 6 N e w F e r m i l a b We b s i t e M a r k s F i r s t A n n i v e r s a r y 1 2 K e p h a r t Ta k e s t h e R o a d t o t h e F u t u r e Ecool Celebrates 8 Ecool Celebrates 8 Photo by Reidar Hahn 2 FERMINEWS Friday, March 1, 2002 Collider Run II at Fermilab's Tevatron officially began on March 1, 2001. Since Tevatron operations resumed in November, 2001, after a two-month shutdown for accelerator and detector upgrades, luminosity has increased more slowly than hoped for. Fermilab has in place a plan to raise the luminosity to the desired levels by the end of 2002. Intense efforts now underway to address a range of technical issues in the accelerator complex are beginning to show results. Great physics awaits increased Tevatron luminosity, and so do the

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

9, 2001 9, 2001 Number 18 f I N S I D E : 6 R e a d y f o r Ye a r s t o C o m e 1 0 F r o g s C o m e A - C o u n t i n ' 1 2 N S F G r a n t Tr i g g e r s W i d e C o m p u t i n g P o s s i b i l i t i e s F r o m B Te V Photo by Reidar Hahn Neutrino Measurement Surprises Fermilab Physicists 2 Neutrino Measurement Surprises Fermilab Physicists 2 0.230 NuTeV result for neutrinos 0.230 0.228 0.228 0.226 0.226 0.224 0.224 0.222 0.222 0.220 0.220 sin 2 θ W boson value (world average derived from mass measurements) charged-particle value (world average for quark, electron, muon and tau signals) Prediction for neutrinos 2 FERMINEWS November 9, 2001 Scientists at Fermilab have found a surprising discrepancy between predictions for the behavior of neutrinos and the way the subatomic particles actually behave. Although the difference is tiny, it is the kind of inconsistency that makes the

402

9 Fermi 5/26/00  

NLE Websites -- All DOE Office Websites (Extended Search)

S S e n s e n b r e n n e r Vi s i t s L a b 4 T h e D E S Y Ð F e r m i l a b C o n n e c t i o n 8 N e x t P h a s e o f W i l s o n H a l l R e h a b 1 4 L e t t e r t o t h e E d i t o r 1 4 S y m p o s i u m o n F i x e d Ta r g e t P r o g r a m a t t h e Te v a t r o n F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 23 Friday, May 26, 2000 Number 10 f Photo by Reidar Hahn CDF Central Outer Tracker 10 2 FERMINEWS May 26, 2000 Representative James Sensenbrenner Jr., (R-Wis.), chairman of the House Science Committee, left no one in the dark about his opinion of Fermilab. ÒFermilab is the jewel in the crown of scientific institutions in the United States,Ó Rep. Sensenbrenner said after a tour of the lab on March 15, including a visit to the manufacturing facility for superconducting magnets critical to the success of the Large Hadron Collider at CERN, the European

403

11 Fermi 2/16/01  

NLE Websites -- All DOE Office Websites (Extended Search)

the three things I have to provide to be popular are: press coverage for the Members, parking for the staff, and money for THE SCIENTIFIC COMMUNITY." " I will fight to INCREASE...

404

8Fermi 10/29/99  

NLE Websites -- All DOE Office Websites (Extended Search)

day, another country, and every stop has a story. Consider, for example, the Bulgarian brass bottleneck, which occasioned the extra trip from Minsk (in the former Soviet Union) to...

405

10 F Fermi 7/27/01  

NLE Websites -- All DOE Office Websites (Extended Search)

in its day, now commonly used for high school physics experiments. In its brass case, the electroscope carries two charged strips of gold leaf, which move apart when...

406

FermiNews - February 2, 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermilab under contract with the U.S. Department of Energy; from the lab's neighboring cities of West Chicago, Warrenville, Batavia and Aurora; from the DuKane Valley Council;...

407

9 Fermi 6/16/00  

NLE Websites -- All DOE Office Websites (Extended Search)

M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I LUNCH WEDNESDAY, JUNE 21 Thai Beef Salad Chocolate Pecan Cake DINNER THURSDAY, JUNE 22 Eggplant Fans Monkfish Tails...

408

Fermi and the ergodic problem Giovanni Gallavotti  

E-Print Network (OSTI)

the esoteric (quasi) ergodic problem. Consider- ing a `{degrees of freedom system, ` > 2, with Hamilto- nian H

Roma "La Sapienza", UniversitĂ  di

409

FermiNews - February, 1 2002  

NLE Websites -- All DOE Office Websites (Extended Search)

Antimatter Becomes Reality Science Finds a Warm Small-Town Welcome in Malargue High Schools Join the Search for Most Energetic Particles in the Universe Painless Physics: A...

410

9 Fermi 2/25/00  

NLE Websites -- All DOE Office Websites (Extended Search)

budget and the prospects for scientific discovery in Run II. He was followed by Ernie Moniz, Under Secretary at DOE, who spoke frankly to the Council. Moniz reiterated that URA...

411

6Fermi 6/18/99  

NLE Websites -- All DOE Office Websites (Extended Search)

soup of elementary particles some 15 billion years ago to present day. Ernest Moniz, undersecretary at DOE. Daniel Goldin, administrator of NASA. Robert Eisenstein,...

412

THE UNIVERSITY OF CHICAGO ENRICO FERMI INSTITUTE  

E-Print Network (OSTI)

from PET scans and MRIs to mapping the interior of the earth; from nuclear nonproliferation to cleaning

413

GLAST (FERMI) Data-Processing Pipeline  

Science Conference Proceedings (OSTI)

The Data Processing Pipeline ('Pipeline') has been developed for the Gamma-Ray Large Area Space Telescope (GLAST) which launched June 11, 2008. It generically processes graphs of dependent tasks, maintaining a full record of its state, history and data products. The Pipeline is used to automatically process the data down-linked from the satellite and to deliver science products to the GLAST collaboration and the Science Support Center and has been in continuous use since launch with great success. The pipeline handles up to 2000 concurrent jobs and in reconstructing science data produces approximately 750GB of data products using 1/2 CPU-year of processing time per day.

Flath, Daniel L.; Johnson, Tony S.; Turri, Massimiliano; Heidenreich, Karen A.; /SLAC

2011-08-12T23:59:59.000Z

414

10p Fermi 3/16/01  

NLE Websites -- All DOE Office Websites (Extended Search)

Center and the Pierre Auger Cosmic ray observatory currently under construction in Argentina. The CSU group has worked on the BABAR drift chamber and the DIRC, and is presently...

415

Fermi National Accelerator Laboratory October 2013  

NLE Websites -- All DOE Office Websites (Extended Search)

implies, the Dark Energy Survey will hopefully help us understand the force we call Dark Energy. Scientists have discovered that the universe is expanding faster and faster....

416

Fermi National Accelerator Laboratory FY 2008  

NLE Websites -- All DOE Office Websites (Extended Search)

University, East Lansing University of Michigan, Ann Arbor Wayne State University, Detroit Minnesota Saint Mary's University of Minnesota University of Minnesota, Minneapolis...

417

Natural multiparticle entanglement in a Fermi gas  

E-Print Network (OSTI)

We investigate multipartite entanglement in a non-interacting fermion gas, as a function of fermion separation, starting from the many particle fermion density matrix. We prove that all multiparticle entanglement can be built only out of two-fermion entanglement. Although from the Pauli exclusion principle we would always expect entanglement to decrease with fermion distance, we surprisingly find the opposite effect for certain fermion configurations. The von Neumann entropy is found to be proportional to the volume for a large number of particles even when they are arbitrarily close to each other. We will illustrate our results using different configurations of two, three, and four fermions at zero temperature although all our results can be applied to any temperature and any number of particles.

C. Lunkes; C. Brukner; V. Vedral

2005-02-20T23:59:59.000Z

418

6 Fermi 5/12/00  

NLE Websites -- All DOE Office Websites (Extended Search)

o s t C a r d s f r o m L o n g B e a c h 8 D A S TO W 2 0 0 0 1 0 S a n t a s Wo r l d R e v i s i t e d 1 2 H o w c a n a n o b j e c t w e s e e t o d a y b e 2 7 b i l l i o...

419

TRAC Teacher Research Program NSM 5408 (FERMI)  

NLE Websites -- All DOE Office Websites (Extended Search)

"EXCELLENCE THROUGH COLLABORATIVE COMMUNITIES OF LEARNERS" AURORA UNIVERSITY SYLLABUS Course Number: NSM 5408 Course Title: TRAC Teacher Research Program 4.5 Semester Hours...

420

9 Fermi 8/25/00  

NLE Websites -- All DOE Office Websites (Extended Search)

not discouraged in our determination to be completely injury free, said Division Head Peter Limon. We might be tempted to think that our recent string of accidents was just a...

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

Rajendran Raja, Hans Jstlein, Jeff Appel, Dave Christian, Mike Syphers, Herman White, Peter Garbincius. Additional volunteers are: Mike Albrow, Bruce Baller, Chuck Brown, Harry...

422

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

lot of people scrambling to try to explain a positive outcome," said Princeton physicist Peter Meyers, member of the MiniBooNE collaboration. Photo by Reidar Hahn On the Web: The...

423

12-12/11/98 Fermi News  

NLE Websites -- All DOE Office Websites (Extended Search)

is 5, kids under 12 are free (12-18 2). Sponsored by the Fermilab Folk Club, contact Lynn Garren, x2061 or Dave Harding, x2971. DECEMBER 14 Graduate Student Association (GSA)...

424

8 Fermi 6/30/00  

NLE Websites -- All DOE Office Websites (Extended Search)

26 26 Stanford University 1 1 Univ. of California at Berkeley 3 3 Univ. of California at Davis 7 7 Univ. of California at Los Angeles 5 5 Univ. of California at San Diego 1 Univ....

425

10 Fermi 4/14/00  

NLE Websites -- All DOE Office Websites (Extended Search)

free (12-18 2). The Fermilab Folk Club sponsors the dance. For more information, contact Lynn Garren x2061 garren@fnal.gov or Dave Harding x2971 harding@fnal.gov, or see http:...

426

FermiNews - September 3, 1999  

NLE Websites -- All DOE Office Websites (Extended Search)

with the Japanese (MQXA) magnets, their function is equivalent to Fermilab's "low beta" quadrupoles: producing the smallest possible beam "spot," or cross-sectional area,...

427

FermiNews - January 31, 2003  

NLE Websites -- All DOE Office Websites (Extended Search)

31, 2003 | Number 2 In This Issue: CERN Receives First U.S.- Built Component for Large Hadron Collider DZero Goes Global New Head of Program Planning Reaching Out: Lederman Fellows...

428

Fermi National Accelerator Laboratory October 2012  

NLE Websites -- All DOE Office Websites (Extended Search)

neutrino beam will go straight through the earth from Fermilab to a new laboratory in Ash River, Minnesota-no tunnel necessary. The experiment will help answer some of the most...

429

FermiNews - March 21, 2003  

NLE Websites -- All DOE Office Websites (Extended Search)

| Number 5 In This Issue: Friends of Friends Universal Language Flat Stanley Visits Fermilab Special Delivery Science Returns to Fixed-Target Area Calendar and Milestones...

430

FermiNews - September, 14 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

Sciences: Physics and Medicine Tools for Diagnosis Tools for Healing Tools for Biomedical Research Tools for the Future Neutrons Against Cancer: 25 Years of Neutron Therapy at...

431

7p Fermi 1/28/00  

NLE Websites -- All DOE Office Websites (Extended Search)

between technical expediency and human rights, we shall stand firmly on the side of human rights. Our support of the rights of the members of minority groups in our...

432

FermiNews - March 30, 2001  

NLE Websites -- All DOE Office Websites (Extended Search)

Wilson Hall Upgrades Let the Sun Shine in Why is a Sammy Sosa Home Run Like a Higgs Boson? Dispatch from Malarge Calendar and Milestones Classifieds and Letter to the...

433

Fermi National Accelerator Laboratory June 2012  

NLE Websites -- All DOE Office Websites (Extended Search)

two distinct top-quark production mechanisms Explored a new mass range for the Higgs boson and constrained its mass through top-quark and W-boson mass measurements Observed...

434

FermiNews - April 28, 2000  

NLE Websites -- All DOE Office Websites (Extended Search)

28, 2000 | Number 8 In This Issue: The Search for Extra Dimensions Gorden Kane's New Book High-Energy Exercise Women Engineers No More Tata Non Grata Calendar and Milestones...

435

Fermi National Accelerator Laboratory June 2012  

NLE Websites -- All DOE Office Websites (Extended Search)

of matter. Using the cosmos as a laboratory, Fermilab scientists explore dark matter and dark energy, unexplained phenomena that constitute 96 percent of the universe. Facilities...

436

13Fermi 1/22/99 lay  

NLE Websites -- All DOE Office Websites (Extended Search)

ionized NaCl solution conducts electricity, and just as the gas inside a fluorescent light bulb conducts electricity. In forming the plasma, some hydrogen atoms lose electrons and...

437

11 Fermi 5/18/01  

NLE Websites -- All DOE Office Websites (Extended Search)

20-million space excursion fare would drop to 4,000 in a hundred years, as the 20 light bulb of a century ago now costs 40 cents. Lindsey sketched out the policy implications by...

438

6p Fermi 12/3/99  

NLE Websites -- All DOE Office Websites (Extended Search)

ovens, but provide far more energya million times more power than an ordinary light bulb, and 75 thousand times the power of a high-end kitchen microwave. In SLACs concept...

439

FermiNews - May 9, 2003  

NLE Websites -- All DOE Office Websites (Extended Search)

2003 | Number 8 In This Issue: Answering the Call Making Connections DASTOWEARTH DAY Burning Plasma: The Future of Fusion Energy Calendar and Milestones Classifieds Chez Leon...

440

11p Fermi 8/4/00  

NLE Websites -- All DOE Office Websites (Extended Search)

(DONUT) experiment, an international collaboration of 54 scientists from Japan, Greece, Korea and the United States. After sifting through more than two years of millions of...

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

9p Fermi 9/15/00  

NLE Websites -- All DOE Office Websites (Extended Search)

and creative ways of problem solving are Delmar Millers trademarks. During his early days at Fermilab, Delmar Miller worked on surveying and aligning accelerator beam lines....

442

Fermi National Accelerator Laboratory August 2013  

NLE Websites -- All DOE Office Websites (Extended Search)

Kansas Kansas State University, Manhattan University of Kansas, Lawrence Wichita State University, Wichita Kentucky University of Kentucky Louisiana Louisiana State University...

443

14Fermi 4/16/99  

NLE Websites -- All DOE Office Websites (Extended Search)

of the people theyve got, wherever they come from. Maria Spiropulu Citizen of: Greece Job at Fermilab: CDF graduate student Why I came to Fermilab: I wanted to do...

444

10p Fermi 7/23/99  

NLE Websites -- All DOE Office Websites (Extended Search)

Fermilab Users Meet the Future Fermilab Users Meet the Future 8 Ready to Make Music 10 The 3rd Option 12 Business Services 13 Talk of the Lab New Perspectives 6 F E R M I L A B A U .S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, July 23, 1999 Number 14 f Photo by Reidar Hahn MEET THE FUTURE A t their annual meeting on July 6 and 7, Fermilab's users expressed w i d e l y d i ffering views on many topics, but on one subject they were nearly unanimous: it was the best users' meeting in years-maybe the best one ever. "It was a great meeting,' said University of Chicago physicist Ed Blucher, a KTeV collaborator. "The focus on the future was good, and we had a lively and interesting exchange of views." Users praised the event's organization by Users' Executive Committee Chair Greg Snow and meeting organizer Dan Amidei. What made it such a good

445

8p Fermi 11/10/00  

NLE Websites -- All DOE Office Websites (Extended Search)

November 10, 2000 November 10, 2000 Number 19 f Photo by Reidar Hahn I N S I D E : 5 L H C M a g n e t P r o t o t y p e s 8 B r a z i l / 5 0 0 1 0 I t C a n Õ t H u r t t o Tr y 1 2 F e r m i l a b U s e r s MiniBooNE READY TO MOVE IN 2 MiniBooNE 2 FERMINEWS November 10, 2000 by Kurt Riesselmann After investing $1.5 million and 12 months of construction work, the MiniBooNE collaboration is getting ready to take over the building that will host its neutrino experiment. The Whittaker Excavating company, which started work on this project in October 1999, is about to put the finishing touches on the building and a 40-foot-diameter tank located inside. ÒWe are on schedule, right at the point that we expected when we first started,Ó said Fermilab physicist Peter Kasper, project manager for the MiniBooNE civil construction. ÒWhittaker will soon be done with its part

446

13p Fermi 12/15/00  

NLE Websites -- All DOE Office Websites (Extended Search)

5, 2000 5, 2000 Number 21 f Photo by Reidar Hahn I N S I D E : 6 Y 2 K : T h a t Wa s T h e Ye a r T h a t Wa s 9 A n t i p r o t o n s J o i n R e c y c l i n g E ff o r t 1 2 S i l e n c e i s G o l d e n 1 4 Ta l k o f t h e L a b ItÕs Beginning to Look a Lot Like Run II 2 2 FERMINEWS December 15, 2000 By Judy Jackson Like Christmas, Collider Run II sometimes seemed that it would never come. Now, suddenly, itÕs almost here, with a million things left to do and a dwindling number of shopping days to pull everything together. The elves at those giant toylands, CDF and DZero, have never been busier, as they prepare for the magical day when Santa Tevatron begins sending sackfuls of high-energy particle collisions to all the good boys and girls at FermilabÕs collider detector experiments. Visions of fermions dance in their heads. True, Christmas at the Tevatron will come in March 2001, and not in

447

5 Fermi 4/13/01  

NLE Websites -- All DOE Office Websites (Extended Search)

January 18, 2002 January 18, 2002 Number 1 f I N S I D E : 2 A C l e a r Vi e w 4 T h e S t u ff T h a t C a m e I n F r o m t h e C o l d 8 C o n t r a s t s : T h e P h o t o E x h i b i t i o n 1 0 J e d B r o w n S e e s t h e Ta l e n t t o M e e t t h e C h a l l e n g e s Photo by Reidar Hahn Fermilab 2002: The Outlook 12 2 FERMINEWS January 18, 2002 It is as translucent as glass. It comes by train, two railcars every week. Fermilab will receive 250,000 gallons of it, enough to fill a 25-meter swimming pool. What is it? Some of the clearest mineral oil available in the country, intended for the MiniBooNE experiment. "It is crystal clear," said physics professor Randy Johnson, who has overseen the selection process of the oil. "It's much clearer than water that comes out of your faucet." Johnson, who teaches at the University of Cincinnati, is one of 60 scientists

448

10 Fermi 4/28/00  

NLE Websites -- All DOE Office Websites (Extended Search)

T T h e S e a r c h f o r E x t r a D i m e n s i o n s 6 G o r d o n K a n e Õs N e w B o o k 8 H i g h - E n e r g y E x e r c i s e 1 4 N o M o r e Ta t a N o n G r a t a F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 23 Friday, April 28, 2000 Number 8 f Photo by Jim Shultz Women Engineers 10 Photo by Jenny Mullins BRANES are big right now. TheyÕre the vibrating membranes that superstring theorists, including FermilabÕs Joe Lykken, have invented over the last five years to describe how our familiar three-dimensional universe might fit into a multidimensional Òmegaverse,Ó one with as many as 11Ñcount Ôem!Ñdimensions, most of them so curled and compactified that we havenÕt detected them here on our own little dimensionally challenged 3-D brane. Superstring theory, with its branes, strings and extra dimensions, represents

449

Fermi National Accelerator Laboratory April 2012  

NLE Websites -- All DOE Office Websites (Extended Search)

into applications for the nation's health, wealth and security. Science at Fermilab Illinois Accelerator Research Center The Illinois Accelerator Research Center, or IARC, will...

450

FermiNews - September 17, 1999  

NLE Websites -- All DOE Office Websites (Extended Search)

Issue: Minos Carnegie Mellon University Safety First, Last and Always Batavia, from Windmills to Accelerators Parking Part IV Talk of the Lab Calendar and Milestones Classifieds...

451

11 Fermi 3/30/01  

NLE Websites -- All DOE Office Websites (Extended Search)

and with the tunnel walls and floor. The particle beam, which corkscrews through the evacuated beampipe at nearly the speed of light, is tuned to that specific alignment. Some...

452

Fermi National Accelerator Laboratory FY 2010  

NLE Websites -- All DOE Office Websites (Extended Search)

Island Brown University, Providence South Carolina University of South Carolina, Columbia South Dakota Augustana College, Sioux Falls Black Hills State University, Spearfish...

453

Experiments with interacting Bose and Fermi gases  

E-Print Network (OSTI)

In the past few years, the study of trapped fermionic atoms evolved from the first cooling experiments which produced quantum degenerate samples to becoming one of the most exciting branches of current atomic physics ...

Stan, Claudiu Andrei

2005-01-01T23:59:59.000Z

454

A. Richard Baldwin Award  

Science Conference Proceedings (OSTI)

The Society's highest service award. A. Richard Baldwin Award Awards Program achievement aocs application award Awards baldwin distinguished division memorial nomination poster program recognizing research service A. Richard Baldwin Award aocs aw

455

User Meeting Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

User Meeting Awards Print ALS User Meeting Awards See the 2012 ALS User Meeting Award Winners Home Agenda Awards Exhibitors Lodging Posters Registration Transportation Workshops...

456

TMS Honors and Awards  

Science Conference Proceedings (OSTI)

For questions about TMS awards, contact. Deborah Price Awards & Recognition Specialist awards@tms.org 724-776-9000 x232. TMS Honors and Awards ...

457

TMS Honors and Awards  

Science Conference Proceedings (OSTI)

Deborah Price Awards & Recognition Specialist awards@tms.org 724-776-9000 x232. TMS Honors and Awards Recognition Program. Current Award Winners ...

458

Champion H. Mathewson Award  

Science Conference Proceedings (OSTI)

Deborah Price Awards & Recognition Specialist awards@tms.org 724-776-9000 x232. TMS Honors and Awards Recognition Program. All Awards.

459

NREL: Awards and Honors - Technology Transfer Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Technology Transfer Awards Federal Laboratory Consortium (FLC) Awards These awards are given to scientists, researchers, and others who work for federal laboratories and agencies...

460

EERE Postdoctoral Research Awards: Postdoctoral Research Awards...  

NLE Websites -- All DOE Office Websites (Extended Search)

Postdoctoral Research Awards: Investing in Innovative Clean Energy Technologies to someone by E-mail Share EERE Postdoctoral Research Awards: Postdoctoral Research Awards:...

Note: This page contains sample records for the topic "fermi award fermi" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

K Awards (Career Development Awards):  

E-Print Network (OSTI)

limitation at 8% F&A recovery limited to 8 % of modified total direct cost rather than negotiated rate. The $700m K Award program results in an annual university-wide subsidy of over $150 million and costs some institutions over $1 million per year. The cost to the institution of providing F&A support to K Awards is comparable to that of research project grant awards (R01s). This limitation results in underreimbursement of the cost of F&A for K Awards.

unknown authors

2013-01-01T23:59:59.000Z

462

The Formula | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

The Life of Enrico Fermi Âť The Formula The Life of Enrico Fermi Âť The Formula The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates Ceremony The Life of Enrico Fermi Contact Information The Enrico Fermi Award U.S. Department of Energy SC-2/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-9395 E: fermi.award@science.doe.gov The Life of Enrico Fermi The Formula Print Text Size: A A A RSS Feeds FeedbackShare Page Enrico Fermi drawing a figure on a chalkboard with formulas above the figure Enrico Fermi The formula written on the blackboard in this famous photo of Enrico Fermi has been at the center of a small controversy for years. Several physicists found an error in this formula. In the first line, Fermi has clearly corrected an incorrect sign (changing a plus to a minus). The second line,

463

Awards Recipients  

NLE Websites -- All DOE Office Websites (Extended Search)

Awards Recipients Awards Recipients Awards Recipients LANL's mission is to develop and apply science and technology to ensure the safety, security, and reliability of the U.S. nuclear deterrent; reduce global threats; and solve other emerging national security and energy challenges. Contact Awards Team (505) 667-7824 Email Awards, peer recognition for LANL employees (2009-present) We are proud of the many employees at LANL who have distinguished careers and receive recognition from colleagues and peers for their work. Current employees follow a Los Alamos tradition of the brightest minds in the world collaborating together in the interest of national security and science and technology innovations for almost seven decades. This worldwide recognition involves the receipt of

464

Harold M. Agnew, 1978 | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Harold M. Agnew, 1978 The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates 2000's 1990's 1980's 1970's 1960's 1950's Ceremony The Life of...

465

Norris E. Bradbury, 1970 | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Norris E. Bradbury, 1970 The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates 2000's 1990's 1980's 1970's 1960's 1950's Ceremony The Life of...

466

Hans A. Bethe, 1961 | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Hans A. Bethe, 1961 The Enrico Fermi Award Fermi Award Home Nomination & Selection Guidelines Award Laureates 2000's 1990's 1980's 1970's 1960's 1950's Ceremony The Life of Enrico...