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Note: This page contains sample records for the topic "5-16 kev monochromator" from the National Library of EnergyBeta (NLEBeta).
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1

Monochromator Crystal Glitch Library  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

SSRL's Monochromator Crystal Glitch Library allows users to view glitch spectra online, list specific crystal orientations, and download PDF files of the glitch spectra. (Specialized Interface)

2

Pulsed-neutron monochromator  

DOE Patents [OSTI]

In one aspect, the invention is an improved pulsed-neutron monochromator of the vibrated-crystal type. The monochromator is designed to provide neutron pulses which are characterized both by short duration and high density. A row of neutron-reflecting crystals is disposed in a neutron beam to reflect neutrons onto a common target. The crystals in the row define progressively larger neutron-scattering angles and are vibrated sequentially in descending order with respect to the size of their scattering angles, thus generating neutron pulses which arrive simultaneously at the target. Transducers are coupled to one end of the crystals to vibrate them in an essentially non-resonant mode. The transducers propagate transverse waves in the crystal which progress longitudinally therein. The waves are absorbed at the undriven ends of the crystals by damping material mounted thereon. In another aspect, the invention is a method for generating neutron pulses characterized by high intensity and short duration.

Mook, H.A. Jr.

1984-01-01T23:59:59.000Z

3

Pulsed-neutron monochromator  

DOE Patents [OSTI]

In one aspect, the invention is an improved pulsed-neutron monochromator of the vibrated-crystal type. The monochromator is designed to provide neutron pulses which are characterized both by short duration and high density. A row of neutron-reflecting crystals is disposed in a neutron beam to reflect neutrons onto a common target. The crystals in the row define progressively larger neutron-scattering angles and are vibrated sequentially in descending order with respect to the size of their scattering angles, thus generating neutron pulses which arrive simultaneously at the target. Transducers are coupled to one end of the crystals to vibrate them in an essentially non-resonant mode. The transducers propagate transverse waves in the crystal which progress longitudinally therein. The wave are absorbed at the undriven ends of the crystals by damping material mounted thereon. In another aspect, the invention is a method for generating neutron pulses characterized by high intensity and short duration.

Mook, Jr., Herbert A. (Oak Ridge, TN)

1985-01-01T23:59:59.000Z

4

High energy resolution, high angular acceptance crystal monochromator  

DOE Patents [OSTI]

A 4-bounce dispersive crystal monochromator reduces the bandpass of synchrotron radiation to a 10-50 meV range without sacrificing angular acceptance. The monochromator includes the combination of an asymmetrical channel-cut single crystal of lower order reflection and a symmetrical channel-cut single crystal of higher order reflection in a nested geometric configuration. In the disclosed embodiment, a highly asymmetrically cut (.alpha.=20) outer silicon crystal (4 2 2) with low order reflection is combined with a symmetrically cut inner silicon crystal (10 6 4) with high order reflection to condition a hard x-ray component (5-30 keV) of synchrotron radiation down to the .mu.eV-neV level. Each of the crystals is coupled to the combination of a positioning inchworm and angle encoder via a respective rotation stage for accurate relative positioning of the crystals and precise energy tuning of the monochromator.

Alp, Ercan E. (Bolingbrook, IL); Mooney, Timothy M. (Westmont, IL); Toellner, Thomas (Green Bay, WI)

1996-06-04T23:59:59.000Z

5

A dynamic focusing x-ray monochromator for a wiggler beam line at the SRS of the SERC Daresbury Laboratory  

SciTech Connect (OSTI)

A Si(220) double-crystal monochromator for the energy range 10--30 keV is presented. It will be used for EXAFS as well as powder diffraction measurements. To determine the requirements for this monochromator we looked, apart from mean considerations, at the requirements dictated by EXAFS in transmission mode. For good data analyses the proper shape, amplitude, and location at the energy axis of each wiggle is required. Moreover it is essential to separate the wiggles from background and noise. For the latter a high flux through the sample is desirable, which can be achieved by horizontal focusing of the beam. For that we have chosen to bend the second crystal sagitally. The sagittal bending radius is adjustable between 50 and 0.8 m, because for different energies different sagittal radii are necessary to focus the beam on the sample. The mean meridional radius of the second crystal is fixed at 130 m, which is an optimization for 20 keV. The meridional radius of the first crystal can be tuned between 100 and 500 m. When this radius is set to 130 m the energy resolution is calculated to be 6, 3, and 35 eV for 10, 20, and 30 keV (for perfectly bent crystals). By changing the meridional radius of the first crystal, future users of this monochromator can make the trade off between resolution and intensity. Movement of the monochromator exit beam, during a scan, will occur due to the monochromator geometry, but is reduced as much as possible by using an asymmetrically cut second crystal, with an asymmetry angle of 2.5{degree}. The average exit beam movement of the monochromator for a 1-keV scan is 20 {mu}m. For 40% of the energy range (10--30 keV) the exit beam position remains within 10 {mu}m. For the second crystal no translation stage is used.

De Bruijn, D.; Van Zuylen, P. (TNO Institute of Applied Physics, P.O. Box 155, 2600 AD Delft (Netherlands)); Kruizinga, G. (Netherlands Organization for Scientific Research (NWO), P.O. Box 93138, 2509 AC Den Haag (Netherlands) State University of Utrecht, Sorbonnelaan 16, 3508 TB Utrecht (Netherlands))

1992-01-01T23:59:59.000Z

6

Seeded quantum FEL at 478 keV  

SciTech Connect (OSTI)

We present for the first time the concept of a seeded {gamma} quantum Free-Electron-Laser (QFEL) at 478 keV, which has very different properties compared to a classical. The basic concept is to produce a highly brilliant {gamma} beam via SASE. To produce highly intense and coherent {gamma} beam, we intend to use a seeded FEL scheme. Important for the production of such a {gamma} beam are novel refractive {gamma}-lenses for focusing and an efficient monochromator, allowing to generate a very intense and coherent seed beam. The energy of the {gamma} beam is 478 keV, corresponding to a wavelength in the sub-Angstrom regime (1/38 A). To realize a coherent {gamma} beam at 478 keV, it is necessary to use a quantum FEL design. At such high radiation energies a classical description of the {gamma}-FEL becomes wrong.

Guenther, M. M.; Jentschel, M.; Thirolf, P. G.; Seggebrock, T.; Habs, D. [Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany); Institut Laue-Langevin, F-38042 Grenoble (Germany); Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany); Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching, Germany and Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany)

2012-07-09T23:59:59.000Z

7

Optical system for high resolution spectrometer/monochromator  

DOE Patents [OSTI]

An optical system for use in a spectrometer or monochromator employing a mirror which reflects electromagnetic radiation from a source to converge with same in a plane is disclosed. A straight grooved, varied-spaced diffraction grating receives the converging electromagnetic radiation from the mirror and produces a spectral image for capture by a detector, target or like receiver. 11 figs.

Hettrick, M.C.; Underwood, J.H.

1988-10-11T23:59:59.000Z

8

Multilayers and Crystal for a Multi-bandpass Monochromator  

SciTech Connect (OSTI)

VESPERS beamline is a hard X-ray microprobe beamline dedicated to micro-diffraction and micro-fluorescence analysis at the Canadian Light Source; it requires multi-bandpass X-ray beams for different types of samples and experiments. A specially designed double crystal/multilayer monochromator was built for this purpose with three different bandpasses: 0.01%, 1.6% and 10%. The diffraction elements used for the monochromator have a triple-stripe design using Si(111) crystal as a single substrate with two differing stripes of Mo/B4C multilayers deposited thereon. The uncovered Si(111) section provides a 0.01% bandpass, while the periodic and depth-graded Mo/B4C multilayers provide 1.6% and 10% bandpasses, respectively. This paper outlines the requirements and specifications of the diffracting elements as well as the design, deposition and optimization of the multilayers. The performance of the deposited multilayer structures has been tested using Cu-Ka radiation line with a Huber diffractometer.

Feng, Renfei [Canadian Light Source, Saskatoon, Canada; Platonov, Yuriy [Rigaku Innovative Technologies, Inc., Auburn Hills, Michigan; Broadway, David [Rigaku Innovative Technologies, Inc., Auburn Hills, Michigan; Ice, Gene E [ORNL; Gerson, Andrea [University of South Australia; McIntyre, Stewart [University of Western Ontario, The

2008-01-01T23:59:59.000Z

9

Performance of a beam-multiplexing diamond crystal monochromator at the Linac Coherent Light Source  

SciTech Connect (OSTI)

A double-crystal diamond monochromator was recently implemented at the Linac Coherent Light Source. It enables splitting pulses generated by the free electron laser in the hard x-ray regime and thus allows the simultaneous operations of two instruments. Both monochromator crystals are High-Pressure High-Temperature grown type-IIa diamond crystal plates with the (111) orientation. The first crystal has a thickness of ?100 ?m to allow high reflectivity within the Bragg bandwidth and good transmission for the other wavelengths for downstream use. The second crystal is about 300 ?m thick and makes the exit beam of the monochromator parallel to the incoming beam with an offset of 600 mm. Here we present details on the monochromator design and its performance.

Zhu, Diling, E-mail: dlzhu@slac.stanford.edu; Feng, Yiping; Lemke, Henrik T.; Fritz, David M.; Chollet, Matthieu; Glownia, J. M.; Alonso-Mori, Roberto; Sikorski, Marcin; Song, Sanghoon; Williams, Garth J.; Messerschmidt, Marc; Boutet, Sébastien; Robert, Aymeric [Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Stoupin, Stanislav; Shvyd'ko, Yuri V. [Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439 (United States); Terentyev, Sergey A.; Blank, Vladimir D. [Technological Institute of Superhard and Novel Carbon Materials, Tsentralnaya str. 7a, Troitsk, Moscow 142190 (Russian Federation); Driel, Tim B. van [Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Center for Molecular Movies, Department of Physics, Technical University of Denmark, DK-2800 Lyngby (Denmark)

2014-06-15T23:59:59.000Z

10

Finite element analysis of the distortion of a crystal monochromator from synchrotron radiation thermal loading  

SciTech Connect (OSTI)

The first crystal of the Brown-Hower x-ray monochromator of the LBL-EXXON 54 pole wiggler beamline at Stanford Synchrotron Radiation Laboratory (SSRL) is subjected to intense synchrotron radiation. To provide an accurate thermal/structural analysis of the existing monochromator design, a finite element analysis (FEA) was performed. A very high and extremely localized heat flux is incident on the Si (220) crystal. The crystal, which possesses pronouncedly temperature-dependent orthotropic properties, in combination with the localized heat load, make the analysis ideally suited for finite element techniques. Characterization of the incident synchrotron radiation is discussed, followed by a review of the techniques employed in modeling the monochromator and its thermal/structural boundary conditions. The results of the finite element analysis, three-dimensional temperature distributions, surface displacements and slopes, and stresses, in the area of interest, are presented. Lastly, the effects these results have on monochromator output flux and resolution are examined.

Edwards, W.R.; Hoyer, E.H.; Thompson, A.C.

1985-10-01T23:59:59.000Z

11

New XAFS spectroscopic investigations in the 1-2 keV region. Final report on LDRD program  

SciTech Connect (OSTI)

Until recently x-ray absorption fine structure (XAFS) measurements in the 1-2 keV region remained a challenging experimental task. This was primarily due to the lack of an adequate monochromator crystal that possessed both the required x-ray properties (large d-spacing, high resolution and reflectivity) and materials properties (ultra-high vacuum (UHV) capability, damage resistance in a synchrotron radiation beam, absence of constituent element absorption edges and stability, both thermal and mechanical). Traditionally, XAFS spectra in this photon energy range have been measured in a piece-wise fashion using a combination of monochromator crystals. Very recently, we have an experimental breakthrough in XAFS spectroscopy in this soft x-ray region. This energy region is of great importance for materials and basic research since the K-edges of Na (1070 eV), Mg (1303 eV), Al (1557 eV) and Si (1839 eV), the L-edges of some 4p elements from Ga to Sr and the M-edges of the rare-earth elements fall within this energy window of the electromagnetic spectrum. YB{sub 66}, a complex binary semiconducting yttrium boride having a cubic crystal structure with a lattice constant of 23.44 {angstrom} has been singled out as a candidate monochromator material for synchrotron radiation in the 1-2 keV region. There is no intrinsic absorption by the constituent elements in this region, which can adequately be dispersed by the (400) reflection having a 2d value of 11.76 {angstrom}. In terms of vacuum compatibility, resistance to radiation damage, thermal and mechanical stability, YB{sub 66} satisfies all the material requirements for use as a monochromator in a synchrotron beam. In the past few years, LLNL in collaboration with a number of other research institutes has pioneered the development of this unique man-made crystal for use as soft x-ray monochromator with synchrotron light sources for materials science studies. 23 refs., 4 figs.

Wong, J.; Froba, M.; Tamura, E.

1996-03-01T23:59:59.000Z

12

Inclined monochromator for high heat-load synchrotron x-ray radiation  

DOE Patents [OSTI]

A double crystal monochromator is described including two identical, parallel crystals, each of which is cut such that the normal to the diffraction planes of interest makes an angle less than 90 degrees with the surface normal. Diffraction is symmetric, regardless of whether the crystals are symmetrically or asymmetrically cut, enabling operation of the monochromator with a fixed plane of diffraction. As a result of the inclination of the crystal surface, an incident beam has a footprint area which is elongated both vertically and horizontally when compared to that of the conventional monochromator, reducing the heat flux of the incident beam and enabling more efficient surface cooling. Because after inclination of the crystal only a fraction of thermal distortion lies in the diffraction plane, slope errors and the resultant misorientation of the diffracted beam are reduced. 11 figures.

Khounsary, A.M.

1994-02-15T23:59:59.000Z

13

[FIXED] perl 5.16.0 File::Glob() causes crashes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched FerromagnetismWaste andAnniversary, part 2Zenoss, VersionThe RoleThe4 ofUSperl 5.16.0

14

Component/OEM XC-HR50 High Frame Rate Monochrome Camera  

E-Print Network [OSTI]

Monochrome Camera B/W Progressive Scan Cameras #12;These new cameras expand the range of products in Sony's progressive scan and high-frame rate, compact camera line up! Introducing the newest additions to Sony's B/sec. for compatibility with slower vision systems using Sony XC-55 cameras. The XC-HR50 and XC-HR70 cameras incorporate

Demoulin, Pascal

15

Subband coding of monochrome images over binary symmetric channels with error correction  

E-Print Network [OSTI]

for the degree of MASTER OF SCIENCE December 1992 Major Subject: Electrical Engineering SUBBAND CODING OF MONOCHROME IMAGES OVER BINARY SYMMETRIC CHANNELS WITH ERROR CORRECTION A Thesis by DENISE M. SHEPPARD Approved as to style and content by: V.... State diagram analysis of error recovery . B. Codebook design C. Performance results . 16 18 23 29 42 48 V VI ERROR CORRECTION A. Algorithm B. Performance Results CONCLUSION REFERENCES APPENDIX A . APPENDIX B . 52 54 61 67 70...

Sheppard, Denise M

2012-06-07T23:59:59.000Z

16

On the 17-keV neutrino  

SciTech Connect (OSTI)

A brief review on the status of the 17-keV neutrino is presented. Several different experiments found spectral distortions which were consistently interpreted as evidence for a heavy neutrino admixture in {beta} decay. Recent experiments, however, rule out the existence of a 17-keV neutrino as well as escaping criticisms of earlier null results. Moreover, the majority of positive results have been reinterpreted in terms of instrumental effects, despite the need for a different explanation in each case. Anomalies persist in the low energy region of the tritium spectrum which deserve further investigation.

Hime, A.

1993-04-01T23:59:59.000Z

17

On the 17-keV neutrino  

SciTech Connect (OSTI)

A brief review on the status of the 17-keV neutrino is presented. Several different experiments found spectral distortions which were consistently interpreted as evidence for a heavy neutrino admixture in [beta] decay. Recent experiments, however, rule out the existence of a 17-keV neutrino as well as escaping criticisms of earlier null results. Moreover, the majority of positive results have been reinterpreted in terms of instrumental effects, despite the need for a different explanation in each case. Anomalies persist in the low energy region of the tritium spectrum which deserve further investigation.

Hime, A.

1993-04-01T23:59:59.000Z

18

301L. Swan (ed.), Origins of Mind, Biosemiotics 8, DOI 10.1007/978-94-007-5419-5_16, Springer Science+Business Media Dordrecht 2013  

E-Print Network [OSTI]

301L. Swan (ed.), Origins of Mind, Biosemiotics 8, DOI 10.1007/978-94-007-5419-5_16, © Springer Science+Business Media Dordrecht 2013 Abstract I introduce a new hypothesis of the origin of complex mind sculpt the mind. 1 Mental Organs There is something fascinating about science. One gets such wholesale

Ray, Thomas S.

19

Hydrogen-Atom Excitation and Ionization by Proton Impact in 50-Kev to 200-Kev Energy Region  

E-Print Network [OSTI]

PH YSICAL RE VIE% A VOLUME 16, N UMBER 8 SEPTEMBER 1977 Hydrogen-atom excitation and ionization by proton impact in the 50- to 200-keV energy region E. Fitchard, A. L. Ford, and J. F. Reading Cyclotron Institute and Department of Physics, Texas A..., and include all terms in the Born series. For projectile energies between SO and 200 keV the results are in excellent agreement with rec'ent experiments. The excitation and ionization of a hydrogen atom by proton impact has been for many years, and still...

Fitchard, E.; Ford, A. Lewis; Reading, John F.

1977-01-01T23:59:59.000Z

20

Data:07657709-0dbd-4f7d-9ba5-16de8191e070 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address:011-DNA Jump to: navigation, searchIllinois:d-9ba5-16de8191e070 No revision has been

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Relic keV sterile neutrinos and reionization  

E-Print Network [OSTI]

A sterile neutrino with mass of several keV can account for cosmological dark matter, as well as explain the observed velocities of pulsars. We show that X-rays produced by the decays of these relic sterile neutrinos can boost the production of molecular hydrogen, which can speed up the cooling of gas and the early star formation, which can, in turn, lead to a reionization of the universe at a high enough redshift to be consistent with the WMAP results.

Peter L. Biermann; Alexander Kusenko

2005-12-31T23:59:59.000Z

22

Lifetime of 981-Kev State in Li-8  

E-Print Network [OSTI]

V y-ray transition observed at 0' to the beam axis was expected to be shifted upward in energy to 1017 keV (unattenuated shift). Since the lifetime was known to be much shorter than the slowing-down times typically obtainable with solid materials... target (full shift ?no significant slowing down of the recoiling nucleus before decay) and the energy of the Doppler- shifted y ray for a solid target (attenuated shift? target material chosen to maximize the slowing- down time). The attenuated...

Throop, M. J.; Youngblood, David H.; Morrison, G. C.

1971-01-01T23:59:59.000Z

23

KeV Warm Dark Matter and Composite Neutrinos  

E-Print Network [OSTI]

Elementary keV sterile Dirac neutrinos can be a natural ingredient of the composite neutrino scenario. For a certain class of composite neutrino theories, these sterile neutrinos naturally have the appropriate mixing angles to be resonantly produced warm dark matter (WDM). Alternatively, we show these sterile neutrinos can be WDM produced by an entropy-diluted thermal freeze-out, with the necessary entropy production arising not from an out-of-equilibrium decay, but rather from the confinement of the composite neutrino sector, provided there is sufficient supercooling.

Dean J Robinson; Yuhsin Tsai

2012-09-25T23:59:59.000Z

24

Linac4 45 keV Proton Beam Measurements  

E-Print Network [OSTI]

Linac4 is a 160 MeV normal-conducting H- linear accelerator, which will replace the 50 MeV proton Linac2 as injector for the CERN proton complex. Commissioning of the low energy part - comprising the H - source, a 45 keV Low Energy Beam Transport line (LEBT), a 3 MeV Radiofrequency Quadrupole (RFQ) and a Medium Energy Beam Transport (MEBT) - will start in fall 2012 on a dedicated test stand installation. In preparation to this, preliminary measurements were taken using a 45 keV proton source and a temporary LEBT setup, with the aim of characterising the output beam by comparison with the predictions of simulations. At the same time this allowed a first verification of the functionalities of diagnostics instrumentation and acquisition software tools. Measurements of beam profile, emittance and intensity were taken in three different setups: right after the source, after the first and after the second LEBT solenoids respectively. Particle distributions were reconstructed from emittance scan...

Bellodi, G; Hein, L M; Lallement, J-B; Lombardi, A M; Midttun, O; Scrivens, R; Posocco, P A

2013-01-01T23:59:59.000Z

25

Origin of The 871-keV Gamma Ray and the "Oxide" Attribute  

SciTech Connect (OSTI)

This brief paper concludes our study of the origin of the 871-keV observed for many plutonium oxide samples.

Peurrung, Anthony J.; Arthur, Richard J.; Geelhood, Bruce D.; Scheele, Randall D.; Elovich, Robert J.; Pratt, Sharon L.

2000-03-22T23:59:59.000Z

26

Sagittal focusing Laue monochromator  

SciTech Connect (OSTI)

An x-ray focusing device generally includes a slide pivotable about a pivot point defined at a forward end thereof, a rail unit fixed with respect to the pivotable slide, a forward crystal for focusing x-rays disposed at the forward end of the pivotable slide and a rearward crystal for focusing x-rays movably coupled to the pivotable slide and the fixed rail unit at a distance rearward from the forward crystal. The forward and rearward crystals define reciprocal angles of incidence with respect to the pivot point, wherein pivoting of the slide about the pivot point changes the incidence angles of the forward and rearward crystals while simultaneously changing the distance between the forward and rearward crystals.

Zhong; Zhong (Stony Brook, NY), Hanson; Jonathan (Wading River, NY), Hastings; Jerome (Stanford, CA), Kao; Chi-Chang (Setauket, NY), Lenhard; Anthony (Medford, NY), Siddons; David Peter (Cutchogue, NY), Zhong; Hui (Coram, NY)

2009-03-24T23:59:59.000Z

27

Experimental Determination of the HPGe Spectrometer Efficiency Calibration Curves for Various Sample Geometry for Gamma Energy from 50 keV to 2000 keV  

SciTech Connect (OSTI)

Detection efficiency of a gamma-ray spectrometry system is dependent upon among others, energy, sample and detector geometry, volume and density of the samples. In the present study the efficiency calibration curves of newly acquired (August 2008) HPGe gamma-ray spectrometry system was carried out for four sample container geometries, namely Marinelli beaker, disc, cylindrical beaker and vial, normally used for activity determination of gamma-ray from environmental samples. Calibration standards were prepared by using known amount of analytical grade uranium trioxide ore, homogenized in plain flour into the respective containers. The ore produces gamma-rays of energy ranging from 53 keV to 1001 keV. Analytical grade potassium chloride were prepared to determine detection efficiency of 1460 keV gamma-ray emitted by potassium isotope K-40. Plots of detection efficiency against gamma-ray energy for the four sample geometries were found to fit smoothly to a general form of {epsilon} = A{Epsilon}{sup a}+B{Epsilon}{sup b}, where {epsilon} is efficiency, {Epsilon} is energy in keV, A, B, a and b are constants that are dependent on the sample geometries. All calibration curves showed the presence of a ''knee'' at about 180 keV. Comparison between the four geometries showed that the efficiency of Marinelli beaker is higher than cylindrical beaker and vial, while cylindrical disk showed the lowest.

Saat, Ahmad [Institute of Science, Universiti Teknologi MARA, 40450 Shah Alam (Malaysia); Hamzah, Zaini; Yusop, Mohammad Fariz; Zainal, Muhd Amiruddin [Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam (Malaysia)

2010-07-07T23:59:59.000Z

28

Performance and application of a double-crystal monochromator in the energy region 800 less than or equal to h. nu. less than or equal to 4500 eV  

SciTech Connect (OSTI)

The performance and application of an ultra-high-vacuum compatible constant-deviation double-crystal monochromator (JUMBO) in operation at SSRL is demonstrated. The monochromator can be operated with any of four pairs of crystals interchangeable in situ. An electronic-maximum-search feedback loop optimizes the intensity of the spatially fixed outgoing beam as the photon energy is scanned. The monochromatic beam is focussed (approx. 1.5 mm x 5 mm) onto the sample by a toroidal mirror. Monochromator crystals of beryl(10 anti 10), InSb(111) and Ge(111) have been tested in the energy regions 800 to 1540 eV, 1690 to 4000 eV and 1930 to 4500 eV, respectively. The performance of these crystals with regard to the resolution, the intensity, the level of scattered light, and the contribution of higher orders have been determined. Various effects arising from a radiation-induced temperature gradient in the monochromator crystals are discussed.

Hussain, Z.; Umbach, E.; Shirley, D.A.; Stoehr, V.; Feldhaus, J.

1981-07-01T23:59:59.000Z

29

Measurement of the differential neutron-deuteron scattering cross section in the energy range from 100 keV to 600 keV using a proportional counter  

E-Print Network [OSTI]

The angular distribution of neutron-deuteron scattering was investigated using the proportional counter P2 simultaneously as scattering target and detector for the recoil deuterons. The measurements were carried out using monoenergetic neutrons in the energy range from 150 keV to 500 keV. Various techniques were employed to reduce distortions of the experimental pulse-height distribution by photon-induced events. The experimental data were compared with realistic simulations which were carried out using different evaluated data sets. This comparison allows to conclude on inconsistencies in the evaluations.

Nolte, R; Plompen, A; Röttger, S

2014-01-01T23:59:59.000Z

30

Origin of the 871-keV gamma ray and the ``oxide'' attribute  

SciTech Connect (OSTI)

This work concludes the investigation of the oxide attribute of current interest for the characterization of stored plutonium. Originally it was believed that the presence of oxide could be ascertained by measurement of the 871-keV line in a high-resolution gamma-ray spectrum. However, recent work has suggested that the 871-keV gamma ray in plutonium oxide arises from the reaction {sup 14}N({alpha},p){sup 17}O rather than the inelastic scattering reaction {sup 17}O({alpha},{alpha}{prime}){sup 17}O*. This conclusion, though initially surprising, was obtained during efforts to determine the relative importance of americium and plutonium alpha-particle decay for the production of the 871-keV gamma ray. Several questions were raised by previous experiments: What role, if any does {sup 17}O have in the generation of the 871-keV gamma ray? How does sufficient nitrogen come to be present in plutonium oxide? Under what conditions is the 871-keV gamma ray measurable in plutonium oxide? This paper describes the answers to these questions.

AJ Peurrung; RJ Arthur; BD Geelhood; RD Scheele; RJ Elovich; SL Pratt

2000-03-22T23:59:59.000Z

31

Analysis of Nitro-Polycyclic Aromatic Hydrocarbons in Conventional Diesel and Fischer--Tropsch Diesel Fuel Emissions Using Electron Monochromator-Mass Spectrometry  

SciTech Connect (OSTI)

The presence of nitro-polycyclic aromatic hydrocarbons (NPAHs) in diesel fuel emissions has been studied for a number of years predominantly because of their contribution to the overall health and environmental risks associated with these emissions. Electron monochromator-mass spectrometry (EM-MS) is a highly selective and sensitive method for detection of NPAHs in complex matrixes, such as diesel emissions. Here, EM-MS was used to compare the levels of NPAHs in fuel emissions from conventional (petroleum) diesel, ultra-low sulfur/low-aromatic content diesel, Fischer-Tropsch synthetic diesel, and conventional diesel/synthetic diesel blend. The largest quantities of NPAHs were detected in the conventional diesel fuel emissions, while the ultra-low sulfur diesel and synthetic diesel fuel demonstrated a more than 50% reduction of NPAH quantities when compared to the conventional diesel fuel emissions. The emissions from the blend of conventional diesel with 30% synthetic diesel fuel also demonstrated a more than 30% reduction of the NPAH content when compared to the conventional diesel fuel emissions. In addition, a correlation was made between the aromatic content of the different fuel types and NPAH quantities and between the nitrogen oxides emissions from the different fuel types and NPAH quantities. The EM-MS system demonstrated high selectivity and sensitivity for detection of the NPAHs in the emissions with minimal sample cleanup required.

Havey, C. D.; McCormick, R. L.; Hayes, R. R.; Dane, A. J.; Voorhees, K. J.

2006-01-01T23:59:59.000Z

32

A Dynamical Framework for KeV Dirac Neutrino Warm Dark Matter  

E-Print Network [OSTI]

If the source of the reported $3.5$ keV x-ray line is a sterile neutrino, comprising an $\\mathcal{O}(1)$ fraction of the dark matter (DM), then it exhibits the property that its mass times mixing angle is $\\sim \\mbox{few} \\times 10^{-2}$ eV, a plausible mass scale for the active neutrinos. This property is a common feature of Dirac neutrino mixing. We present a framework that dynamically produces light active and keV sterile Dirac neutrinos, with appropriate mixing angles to be the x-ray line source. The central idea is that the right-handed active neutrino is a composite state, while elementary sterile neutrinos gain keV masses similarly to the quarks in extended Technicolor. The entire framework is fixed by just two dynamical scales and may automatically exhibit a warm dark matter (WDM) production mechanism -- dilution of thermal relics from late decays of a heavy composite neutrino -- such that the keV neutrinos may comprise an $\\mathcal{O}(1)$ fraction of the DM. In this framework, the WDM is typically quite cool and within structure formation bounds, with temperature $\\sim \\mbox{few}\\times 10^{-2}~T_\

Dean J. Robinson; Yuhsin Tsai

2014-08-06T23:59:59.000Z

33

Neutron Total Cross Sections of {sup 235}U From Transmission Measurements in the Energy Range 2 keV to 300 keV and Statistical Model Analysis of the Data  

SciTech Connect (OSTI)

The average {sup 235}U neutron total cross sections were obtained in the energy range 2 keV to 330 keV from high-resolution transmission measurements of a 0.033 atom/b sample.1 The experimental data were corrected for the contribution of isotope impurities and for resonance self-shielding effects in the sample. The results are in very good agreement with the experimental data of Poenitz et al.4 in the energy range 40 keV to 330 keV and are the only available accurate experimental data in the energy range 2 keV to 40 keV. ENDF/B-VI evaluated data are 1.7% larger. The SAMMY/FITACS code 2 was used for a statistical model analysis of the total cross section, selected fission cross sections and data in the energy range 2 keV to 200 keV. SAMMY/FITACS is an extended version of SAMMY which allows consistent analysis of the experimental data in the resolved and unresolved resonance region. The Reich-Moore resonance parameters were obtained 3 from a SAMMY Bayesian fits of high resolution experimental neutron transmission and partial cross section data below 2.25 keV, and the corresponding average parameters and covariance data were used in the present work as input for the statistical model analysis of the high energy range of the experimental data. The result of the analysis shows that the average resonance parameters obtained from the analysis of the unresolved resonance region are consistent with those obtained in the resolved energy region. Another important result is that ENDF/B-VI capture cross section could be too small by more than 10% in the energy range 10 keV to 200 keV.

Derrien, H.; Harvey, J.A.; Larson, N.M.; Leal, L.C.; Wright, R.Q.

2000-05-01T23:59:59.000Z

34

Production of Sterile Neutrino Dark Matter and the 3.5 keV line  

E-Print Network [OSTI]

The recent observation of an X-ray line at an energy of 3.5 keV mainly from galaxy clusters has initiated a discussion about whether we may have seen a possible dark matter signal. If confirmed, this signal could stem from a decaying sterile neutrino of a mass of 7.1 keV. Such a particle could make up all the dark matter, but it is not clear how it was produced in the early Universe. In this letter we show that it is possible to discriminate between different production mechanisms with present-day astronomical data. The most stringent constraint comes from the Lyman-{\\alpha} forest and seems to disfavor all but one of the main production mechanisms proposed in the literature, which is the production via decay of heavy scalar singlets. Pinning down the production mechanism will help to decide whether the X-ray signal indeed comprises an indirect detection of dark matter.

Alexander Merle; Aurel Schneider

2015-02-11T23:59:59.000Z

35

Study of photon attenuation coefficients of some multielement materials. [123-1250 keV  

SciTech Connect (OSTI)

Total photon mass attenuation of six multielement shielding materials (concrete, plaster of paris, quick lime, black cement, white cement, and silica) is measured in the 123- to 1,250-keV energy range. The experimental results are analyzed in terms of cross sections, effective atomic numbers, and electron densities. Considerable sensitivity of the total mass attenuation coefficients and effective atomic numbers to variations in oxygen content are found in these multielement materials.

Bhandal, G.S. (N.J.S.A. Government Coll., Punjab (India)); Singh, K. (Guru Nanak Dev Univ., Amritsar (India). Dept. of Physics)

1994-03-01T23:59:59.000Z

36

HELIOSPHERIC NEUTRAL ATOM SPECTRA BETWEEN 0.01 AND 6 keV FROM IBEX  

SciTech Connect (OSTI)

Since 2008 December, the Interstellar Boundary Explorer (IBEX) has been making detailed observations of neutrals from the boundaries of the heliosphere using two neutral atom cameras with overlapping energy ranges. The unexpected, yet defining feature discovered by IBEX is a Ribbon that extends over the energy range from about 0.2 to 6 keV. This Ribbon is superposed on a more uniform, globally distributed heliospheric neutral population. With some important exceptions, the focus of early IBEX studies has been on neutral atoms with energies greater than {approx}0.5 keV. With nearly three years of science observations, enough low-energy neutral atom measurements have been accumulated to extend IBEX observations to energies less than {approx}0.5 keV. Using the energy overlap of the sensors to identify and remove backgrounds, energy spectra over the entire IBEX energy range are produced. However, contributions by interstellar neutrals to the energy spectrum below 0.2 keV may not be completely removed. Compared with spectra at higher energies, neutral atom spectra at lower energies do not vary much from location to location in the sky, including in the direction of the IBEX Ribbon. Neutral fluxes are used to show that low energy ions contribute approximately the same thermal pressure as higher energy ions in the heliosheath. However, contributions to the dynamic pressure are very high unless there is, for example, turbulence in the heliosheath with fluctuations of the order of 50-100 km s{sup -1}.

Fuselier, S. A.; Ghielmetti, A. G.; Petrinec, S. M.; Trattner, K. J., E-mail: sfuselier@swri.edu, E-mail: fallegrini@swri.edu [Lockheed Martin Advanced Technology Center, Palo Alto, CA 94304 (United States); and others

2012-07-20T23:59:59.000Z

37

The Reuven Ramaty High Energy Solar Spectroscopic Imager observation of the 1809 keV line from Galactic 26Al  

E-Print Network [OSTI]

Observations of the central radian of the Galaxy by the Reuven Ramaty High Energy Solar Spectroscopy Imager (RHESSI) have yielded a high-resolution measurement of the 1809 keV line from 26Al, detected at 11 sigma significance in nine months of data. The RHESSI result for the width of the cosmic line is 2.03 (+0.78, -1.21) keV FWHM. The best fit line width of 5.4 keV FWHM reported by Naya et al. (1996) using the Gamma-Ray Imaging Spectrometer (GRIS) balloon instrument is rejected with high confidence.

David M. Smith

2003-04-28T23:59:59.000Z

38

Interstitial defects in silicon from 1{endash}5 keV Si{sup +} ion implantation  

SciTech Connect (OSTI)

Extended defects from 5-, 2-, and 1-keV Si{sup +} ion implantation are investigated by transmission electron microscopy using implantation doses of 1 and 3{times}10{sup 14}cm{sup {minus}2} and annealing temperatures from 750 to 900{degree}C. Despite the proximity of the surface, {l_brace}311{r_brace}-type defects are observed even for 1 keV. Samples with a peak concentration of excess interstitials exceeding {approximately}1{percent} of the atomic density also contain some {l_brace}311{r_brace} defects which are corrugated across their width. These so-called zig-zag {l_brace}311{r_brace} defects are more stable than the ordinary {l_brace}311{r_brace} defects, having a dissolution rate at 750{degree}C which is ten times smaller. Due to their enhanced stability, the zig-zag {l_brace}311{r_brace} defects grow to lengths that are many times longer than their distance from the surface. It is proposed that zig-zag {l_brace}311{r_brace} defects form during the early stages of annealing by coalescence the high volume density of {l_brace}311{r_brace} defects confined within a very narrow implanted layer. These findings indicate that defect formation and dissolution will continue to control the interstitial supersaturation from ion implantation down to very low energies. {copyright} {ital 1997 American Institute of Physics.}

Agarwal, A.; Haynes, T.E. [Oak Ridge National Laboratory, MS-6048, Oak Ridge, Tennessee 37831 (United States)] [Oak Ridge National Laboratory, MS-6048, Oak Ridge, Tennessee 37831 (United States); Eaglesham, D.J.; Gossmann, H.; Jacobson, D.C.; Poate, J.M. [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States); Erokhin, Y.E. [Eaton Corporation, 108 Cherry Hill Drive, Beverly, Massachusetts 01915 (United States)] [Eaton Corporation, 108 Cherry Hill Drive, Beverly, Massachusetts 01915 (United States)

1997-06-01T23:59:59.000Z

39

Student research with 400keV beams: {sup 13}N radioisotope production target development  

SciTech Connect (OSTI)

The AN400 Van de Graaff accelerator at the Minnesota State University, Mankato, Applied Nuclear Science Lab has demonstrated utility as an accessible and versatile platform for student research. Despite the limits of low energy, the research team successfully developed projects with applications to the wider radioisotope production community. A target system has been developed for producing and extracting {sup 13}N by the {sup 12}C(d,n){sup 13}N reaction below 400keV. The system is both reusable and robust, with future applications to higher energy machines producing this important radioisotope for physiological imaging studies with Positron Emission Tomography. Up to 36({+-}1)% of the {sup 13}N was extracted from the graphite matrix when 35 A current was externally applied to the graphite target while simultaneously flushing the target chamber with CO{sub 2} gas.

Fru, L. Che; Clymer, J.; Compton, N.; Cotter, J.; Dam, H.; Lesko, Z.; Pautzke, J.; Prokop, C.; Swanson, L.; Roberts, A. D. [Department of Physics and Astronomy, Minnesota State University, Trafton Science Center N141, Mankato MN 56001 (United States)

2013-04-19T23:59:59.000Z

40

Degeneracy at 1871 keV in {sup 112}Cd and implications for neutrinoless double electron capture  

SciTech Connect (OSTI)

High-statistics {beta}-decay measurements of {sup 112}Ag and {sup 112}In were performed to study the structure of the {sup 112}Cd nucleus. The precise energies of the doublet of levels at 1871 keV, for which the 0{sup +} member has been suggested as a possible daughter state following neutrinoless double electron capture of {sup 112}Sn, were determined to be 1871.137(72) keV (0{sub 4}{sup +} level) and 1870.743(54) keV (4{sub 2}{sup +} level). The nature of the 0{sub 4}{sup +} level, required for the calculation of the nuclear matrix element that would be needed to extract a neutrino mass from neutrinoless double electron capture to this state, is suggested to be of intruder origin.

Green, K. L.; Garrett, P. E.; Demand, G. A.; Grinyer, G. F.; Leach, K. G.; Phillips, A. A.; Schumaker, M. A.; Svensson, C. E.; Wong, J. [Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1 (Canada); Austin, R. A. E.; Colosimo, S. [Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3 (Canada); Ball, G. C.; Bandyopadhyay, D. S.; Hackman, G.; Morton, A. C.; Pearson, C. J. [TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada); Cross, D. [Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada); Kulp, W. D.; Wood, J. L. [School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430 (United States); Yates, S. W. [Departments of Chemistry and Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

2009-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

The Swift/Fermi GRB 080928 from 1 eV to 150 keV  

E-Print Network [OSTI]

We present the results of a comprehensive study of the Gamma-Ray Burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission was already detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 seconds simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. Here we analyze the prompt emission, constrain its spectral properties, and set lower limits on the initial Lorentz factor of the relativistic outflow. In particular, we show that the SED during the main prompt emission phase is in agreement with synchrotron radiation. We construct the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT, ROTSE-IIIa (Australia) and GROND (La Silla) data and compare it to the X-ray light curve retrieved from the Swift/XRT repository. We show that its bumpy shape ca...

Rossi, A; Klose, S; Kann, D A; Rau, A; Krimm, H A; Jóhannesson, G; Panaitescu, A; Yuan, F; Ferrero, P; Krühler, T; Greiner, J; Schady, P; Pandey, S B; Amati, L; Afonso, P M J; Akerlof, C W; Arnold, L; Clemens, C; Filgas, R; Hartmann, D H; Yolda?, A Küpcü; McBreen, S; McKay, T A; Guelbenzu, A Nicuesa; E., F Olivares; Paciesas, B; Rykoff, E S; Szokoly, G; Updike, A C; Yolda?, A

2010-01-01T23:59:59.000Z

42

On the keV sterile neutrino search in electron capture  

E-Print Network [OSTI]

A joint effort of cryogenic microcalorimetry (CM) and high-precision Penning-trap mass spectrometry (PT-MS) in investigating atomic orbital electron capture (EC) can shed light on the possible existence of heavy sterile neutrinos with masses from 0.5 to 100 keV. Sterile neutrinos are expected to perturb the shape of the atomic de-excitation spectrum measured by CM after a capture of the atomic orbital electrons by a nucleus. This effect should be observable in the ratios of the capture probabilities from different orbits. The sensitivity of the ratio values to the contribution of sterile neutrinos strongly depends on how accurately the mass difference between the parent and the daughter nuclides of EC-transitions can be measured by, e.g., PT-MS. A comparison of such probability ratios in different isotopes of a certain chemical element allows one to exclude many systematic uncertainties and thus could make feasible a determination of the contribution of sterile neutrinos on a level below 1%. Several electron capture transitions suitable for such measurements are discussed.

P. E. Filianin; K. Blaum; S. A. Eliseev; L. Gastaldo; Yu. N. Novikov; V. M. Shabaev; I. I. Tupitsyn; J. Vergados

2014-02-18T23:59:59.000Z

43

A DATABASE OF >20 keV ELECTRON GREEN'S FUNCTIONS OF INTERPLANETARY TRANSPORT AT 1 AU  

SciTech Connect (OSTI)

We use interplanetary transport simulations to compute a database of electron Green's functions, i.e., differential intensities resulting at the spacecraft position from an impulsive injection of energetic (>20 keV) electrons close to the Sun, for a large number of values of two standard interplanetary transport parameters: the scattering mean free path and the solar wind speed. The nominal energy channels of the ACE, STEREO, and Wind spacecraft have been used in the interplanetary transport simulations to conceive a unique tool for the study of near-relativistic electron events observed at 1 AU. In this paper, we quantify the characteristic times of the Green's functions (onset and peak time, rise and decay phase duration) as a function of the interplanetary transport conditions. We use the database to calculate the FWHM of the pitch-angle distributions at different times of the event and under different scattering conditions. This allows us to provide a first quantitative result that can be compared with observations, and to assess the validity of the frequently used term beam-like pitch-angle distribution.

Agueda, N.; Sanahuja, B. [Departament d'Astronomia i Meteorologia, Institut de Ciencies del Cosmos, Universitat de Barcelona, Barcelona (Spain); Vainio, R. [Department of Physics, University of Helsinki, Helsinki (Finland)

2012-10-15T23:59:59.000Z

44

keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: Basic Concepts and Subtle Features  

E-Print Network [OSTI]

We perform a detailed and illustrative study of the production of keV sterile neutrino Dark Matter (DM) by decays of singlet scalars in the early Universe. In the current study we focus on providing a clear and general overview of this production mechanism. For the first time we study all regimes possible on the level of momentum distribution functions, which we obtain by solving a system of Boltzmann equations. These quantities contain the full information about the production process, which allows us to not only track the evolution of the DM generation but to also take into account all bounds related to the spectrum, such as constraints from structure formation or from avoiding too much dark radiation. In particular we show that this simple production mechanism can, depending on the regime, lead to strongly non-thermal DM spectra which may even feature more than one peak in the momentum distribution. These cases could have particularly interesting consequences for cosmological structure formation, as their ...

Merle, Alexander

2015-01-01T23:59:59.000Z

45

Development of a modular CdTe detector plane for gamma-ray burst detection below 100 keV  

E-Print Network [OSTI]

We report on the development of an innovative CdTe detector plane (DPIX) optimized for the detection and localization of gamma-ray bursts in the X-ray band (below 100 keV). DPIX is part of an R&D program funded by the French Space Agency (CNES). DPIX builds upon the heritage of the ISGRI instrument, currently operating with great success on the ESA INTEGRAL mission. DPIX is an assembly of 200 elementary modules (XRDPIX) equipped with 32 CdTe Schottky detectors (4x4 mm2, 1 mm thickness) produced by ACRORAD Co. LTD. in Japan. These detectors offer good energy response up to 100 keV. Each XRDPIX is readout by the very low noise front-end electronics chip IDeF-X, currently under development at CEA/DSM/DAPNIA. In this paper, we describe the design of XRDPIX, the main features of the IDeF-X chip, and will present preliminary results of the reading out of one CdTe Schottky detector by the IDeF-X V1.0 chip. A low-energy threshold around 2.7 keV has been measured. This is to be compared with the 12-15 keV threshol...

Ehanno, M; Barret, D; Lacombe, K; Pons, R; Rouaix, G; Gevin, O; Limousin, O; Lugiez, F; Bardoux, A; Penquer, A

2007-01-01T23:59:59.000Z

46

Development of a modular CdTe detector plane for gamma-ray burst detection below 100 keV  

E-Print Network [OSTI]

We report on the development of an innovative CdTe detector plane (DPIX) optimized for the detection and localization of gamma-ray bursts in the X-ray band (below 100 keV). DPIX is part of an R&D program funded by the French Space Agency (CNES). DPIX builds upon the heritage of the ISGRI instrument, currently operating with great success on the ESA INTEGRAL mission. DPIX is an assembly of 200 elementary modules (XRDPIX) equipped with 32 CdTe Schottky detectors (4x4 mm2, 1 mm thickness) produced by ACRORAD Co. LTD. in Japan. These detectors offer good energy response up to 100 keV. Each XRDPIX is readout by the very low noise front-end electronics chip IDeF-X, currently under development at CEA/DSM/DAPNIA. In this paper, we describe the design of XRDPIX, the main features of the IDeF-X chip, and will present preliminary results of the reading out of one CdTe Schottky detector by the IDeF-X V1.0 chip. A low-energy threshold around 2.7 keV has been measured. This is to be compared with the 12-15 keV threshold of the ISGRI-INTEGRAL and BAT-SWIFT instruments, which both use similar detector material.

M. Ehanno; C. Amoros; D. Barret; K. Lacombe; R. Pons; G. Rouaix; O. Gevin; O. Limousin; F. Lugiez; A. Bardoux; A. Penquer

2007-01-15T23:59:59.000Z

47

3.55 keV photon lines from axion to photon conversion in the Milky Way and M31  

E-Print Network [OSTI]

We further explore a scenario in which the recently observed 3.55 keV photon line arises from dark matter decay to an axion-like particle (ALP) of energy 3.55 keV, which then converts to a photon in astrophysical magnetic fields. This ALP scenario is well-motivated by the observed morphology of the 3.55 keV flux. For this scenario we study the expected flux from dark matter decay in the galactic halos of both the Milky Way and Andromeda (M31). The Milky Way magnetic field is asymmetric about the galactic centre, and so the resulting 3.55 keV flux morphology differs significantly from the case of direct dark matter decay to photons. However the Milky Way magnetic field is not large enough to generate an observable signal, even with ASTRO-H. In contrast, M31 has optimal conditions for ALP to photon conversion and the intrinsic signal from M31 becomes two orders of magnitude larger than for the Milky Way, comparable to that from clusters and consistent with observations.

Joseph P. Conlon; Francesca V. Day

2014-11-24T23:59:59.000Z

48

First limits on the 3-200 keV X-ray spectrum of the quiet Sun using RHESSI  

E-Print Network [OSTI]

We present the first results using the Reuven Ramaty High-Energy Solar Spectroscopic Imager, RHESSI, to observe solar X-ray emission not associated with active regions, sunspots or flares (the quiet Sun). Using a newly developed chopping technique (fan-beam modulation) during seven periods of offpointing between June 2005 to October 2006, we obtained upper limits over 3-200 keV for the quietest times when the GOES12 1-8A flux fell below $10^{-8}$ Wm$^{-2}$. These values are smaller than previous limits in the 17-120 keV range and extend them to both lower and higher energies. The limit in 3-6 keV is consistent with a coronal temperature $\\leq 6$ MK. For quiet Sun periods when the GOES12 1-8A background flux was between $10^{-8}$ Wm$^{-2}$ and $10^{-7}$ Wm$^{-2}$, the RHESSI 3-6 keV flux correlates to this as a power-law, with an index of $1.08 \\pm 0.13$. The power-law correlation for microflares has a steeper index of $1.29 \\pm 0.06$. We also discuss the possibility of observing quiet Sun X-rays due to solar axions and use the RHESSI quiet Sun limits to estimate the axion-to-photon coupling constant for two different axion emission scenarios.

Iain G. Hannah; G. J Hurford; H. S. Hudson; R. P. Lin; K. van Bibber

2007-02-27T23:59:59.000Z

49

20to2-3T5m2+5: 16-cm I.R., 46-cm O.D., 8.6 MW, Optimized Cooling Robert J. Weggel; Magnet Optimization Research Engineering (M.O.R.E.), LLC; 1/26/2014  

E-Print Network [OSTI]

Optimization Research Engineering (M.O.R.E.), LLC; 1/26/2014 Fig. 1. On-axis field profiles of 20-T magnets20to2-3T5m2+5: 16-cm I.R., 46-cm O.D., 8.6 MW, Optimized Cooling Robert J. Weggel; Magnet of 16-cm I.R. The copper magnet generates 5 T at 8.6 MW with five tightly-nested two-layer coils

McDonald, Kirk

50

A CHANDRA OBSERVATION OF 3C 288—REHEATING THE COOL CORE OF A 3 keV CLUSTER FROM A NUCLEAR OUTBURST at z = 0.246  

E-Print Network [OSTI]

We present results from a 42 ks Chandra/ACIS-S observation of the transitional FR I/FR II radio galaxy 3C 288 at z = 0.246. We detect ~3 keV gas extending to a radius of ~0.5 Mpc with a 0.5-2.0 keV luminosity of 6.6 × ...

Lal, D. V.

51

Resolving the 10-40 keV Cosmic X-ray Background with Constellation-X  

E-Print Network [OSTI]

The energy density of the Cosmic X-ray background (XRB) peaks around 30 keV (see Figure 1), an energy not yet probed by focussing imaging instruments. The first hard X-ray telescope due to fly on a space mission will be that on board Constellation-X. The imaging capability, besides providing an improvement of several orders of magnitude in sensitivity over current passively collimated detectors, will permit for the first time to resolve a fraction of the XRB at this most crucial energy. Synthesis models of the XRB based on obscured AGN predict that at least 40% of the 10-40 keV XRB will be resolved by Constellation-X.

Giorgio Matt; Fulvio Pompilio; Fabio La Franca

2000-07-08T23:59:59.000Z

52

First measurement of the 14N(p,gamma)15O cross section down to 70 keV  

E-Print Network [OSTI]

In stars with temperatures above 20*10^6 K, hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p,gamma)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at the LUNA 400 kV accelerator, the cross section of this reaction has been measured at energies much lower than ever achieved before. Using a windowless gas target and a 4pi BGO summing detector, direct cross section data has been obtained down to 70 keV, reaching a value of 0.24 picobarn. The Gamow peak has been covered by experimental data for several scenarios of stable and explosive hydrogen burning. In addition, the strength of the 259 keV resonance has been remeasured. The thermonuclear reaction rate has been calculated for temperatures 90 - 300 *10^6 K, for the first time with negligible impact from extrapolations.

A. Lemut; D. Bemmerer; F. Confortola; R. Bonetti; C. Broggini; P. Corvisiero; H. Costantini; J. Cruz; A. Formicola; Zs. Fulop; G. Gervino; A. Guglielmetti; C. Gustavino; Gy. Gyurky; G. Imbriani; A. P. Jesus; M. Junker; B. Limata; R. Menegazzo; P. Prati; V. Roca; D. Rogalla; C. Rolfs; M. Romano; C. Rossi Alvarez; F. Schumann; E. Somorjai; O. Straniero; F. Strieder; F. Terrasi; H. P. Trautvetter

2006-02-09T23:59:59.000Z

53

Sterile neutrino dark matter in B-L extension of the standard model and galactic 511 keV line  

SciTech Connect (OSTI)

Sterile right-handed neutrinos can be naturally embedded in a low scale gauged U(1){sub B-L} extension of the standard model. We show that, within a low reheating scenario, such a neutrino is an interesting dark matter candidate. We emphasize that if the neutrino mass is of the order of MeV, then it accounts for the measured dark matter relic density and also accommodates the observed flux of 511 keV photons from the galactic bulge.

Khalil, Shaaban [Centre for Theoretical Physics, The British University in Egypt, El Sherouk City, Postal No. 11837, PO Box 43 (Egypt)] [Centre for Theoretical Physics, The British University in Egypt, El Sherouk City, Postal No. 11837, PO Box 43 (Egypt); Seto, Osamu, E-mail: skhalil@bue.edu.eg, E-mail: seto@physics.umn.edu [Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, Cantoblanco, Madrid 28049 (Spain)] [Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, Cantoblanco, Madrid 28049 (Spain)

2008-10-15T23:59:59.000Z

54

TIME-RESOLVED 1-10 keV CRYSTAL SPECTROMETER FOR THE Z MACHINE AT SANDIA NATIONAL LABORATORIES  

SciTech Connect (OSTI)

We have designed, fabricated, calibrated, and fielded a fast, time-resolved 1-10 keV crystal spectrometer to observe the evolution of wire pinch spectra at the Z machine at Sandia National Laboratories. The instrument has two convex cylindrical crystals (PET and KAP). Both crystals Bragg reflect x-rays into an array of ten silicon diodes, providing continuous spectral coverage in twenty channels from 1.0 to 10 keV. The spectral response of the instrument has been calibrated from 1.0 to 6.3 keV at beamline X8A at the National Synchrotron Light Source. The time response of the 1-mm2 silicon detectors was measured with the Pulsed X-ray Source at Bechtel Nevada's Los Alamos Operations, where 2-nanosecond full-width half-maximum (FWHM) waveforms with 700-picosecond rise times typically were observed. The spectrometer has been fielded recently on several experimental runs at the Z Machine. In this paper, we present the time-resolved spectra resulting from the implosions of double-nested tungsten wire arrays onto 5-mm diameter foam cylinders. We also show the results obtained for a double-nested stainless steel wire array with no target cylinder. The spectrometer was located at the end of a 7.1-meter beamline on line-of sight (LOS)21/22, at an angle 12{sup o} above the equatorial plane, and was protected from the debris field by a customized dual-slit fast valve. The soft detector channels below 2.0 keV recorded large signals at pinch time coinciding with signals recorded on vacuum x-ray diodes (XRDs). On experiment Z993, the spectrometer channels recorded a second pulse with a hard x-ray emission spectrum several nanoseconds after pinch time.

D. V. Morgan; S. Gardner; R. Liljestrand; M. Madlener; S. Slavin; M. Wu

2003-06-01T23:59:59.000Z

55

GALAXY CLUSTERS IN THE SWIFT/BAT ERA. II. 10 MORE CLUSTERS DETECTED ABOVE 15 keV  

SciTech Connect (OSTI)

We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. Among the newly BAT-discovered clusters there are Bullet, A85, Norma, and PKS 0745-19. Norma is the only cluster, among those presented here, which is resolved by BAT. For all the clusters, we perform a detailed spectral analysis using XMM-Newton and Swift/BAT data to investigate the presence of a hard (non-thermal) X-ray excess. We find that in most cases the clusters' emission in the 0.3-200 keV band can be explained by a multi-temperature thermal model confirming our previous results. For two clusters (Bullet and A3667), we find evidence for the presence of a hard X-ray excess. In the case of the Bullet cluster, our analysis confirms the presence of a non-thermal, power-law-like, component with a 20-100 keV flux of 3.4 x 10{sup -12} erg cm{sup -2} s{sup -1} as detected in previous studies. For A3667, the excess emission can be successfully modeled as a hot component (kT {approx} 13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely a thermal origin.

Ajello, M.; Reimer, O. [SLAC National Laboratory and Kavli Institute for Particle Astrophysics and Cosmology, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States); Rebusco, P. [Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA 02139 (United States); Cappelluti, N.; Boehringer, H. [Max Planck Institut fuer Extraterrestrische Physik, P.O. Box 1603, 85740, Garching (Germany); La Parola, V.; Cusumano, G., E-mail: majello@slac.stanford.ed [INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, via U. La Malfa 153, 90146 Palermo (Italy)

2010-12-20T23:59:59.000Z

56

Variable Gap Undulator for 1.5-48 Kev Free Electron Laser at Linac Coherent Light Source  

SciTech Connect (OSTI)

We study the feasibility of generating femtosecond duration Free-Electron Laser with a variable photon energy from 1.5 to 48 keV, using an electron bunch with the same characteristics of the LINAC Coherent Light Source (LCLS) bunch, and a planar undulator with additional focusing. We assume that the electron bunch energy can be changed, and the undulator has a variable gap, allowing a variable undulator parameter. It is assumed to be operated in an ultra-low charge and ultra-short pulse regime. We study the feasibility of a tunable, short pulse, X-ray FEL with photon energy from 1.5 to 48 keV, using an electron beam like the one in the LCLS and a 2:5 cm period, variable gap, planar undulator. The beam energy changes from 4.6 to 13.8 GeV, the electorn charge is kept at 10 pC, and the undulator parameter varies from 1 to 3. The undulator length needed to saturate the 48 keV FEL is about 55 m, with a peak power around 5 GW. At longer wavelength the saturation length is as short as 15 m, and the peak power around 20 GW. The results from the analytical models and the GENESIS simulations show that the system is feasible. The large wavelength range, full tunability and short, few femtosecond pulses, together with the large peak power, would provide a powerful research tool.

Pellegrini, C.; /UCLA; Wu, J.; /SLAC; ,

2011-08-17T23:59:59.000Z

57

Contrasting physics in wire array z pinch sources of 1-20?keV emission on the Z facility  

SciTech Connect (OSTI)

Imploding wire arrays on the 20 MA Z generator have recently provided some of the most powerful and energetic laboratory sources of multi-keV photons, including ?375?kJ of Al K-shell emission (h????1–2?keV), ?80?kJ of stainless steel K-shell emission (h????5–9?keV) and a kJ-level of Mo K-shell emission (h????17?keV). While the global implosion dynamics of these different wire arrays are very similar, the physical process that dominates the emission from these x-ray sources fall into three broad categories. Al wire arrays produce a column of plasma with densities up to ?3?×?10{sup 21} ions/cm{sup 3}, where opacity inhibits the escape of K-shell photons. Significant structure from instabilities can reduce the density and increase the surface area, therefore increase the K-shell emission. In contrast, stainless steel wire arrays operate in a regime where achieving a high pinch temperature (achieved by thermalizing a high implosion kinetic energy) is critical and, while opacity is present, it has less impact on the pinch emissivity. At higher photon energies, line emission associated with inner shell ionization due to energetic electrons becomes important.

Ampleford, D. J., E-mail: damplef@sandia.gov; Jones, B.; Jennings, C. A.; Hansen, S. B.; Cuneo, M. E.; Harvey-Thompson, A. J.; Rochau, G. A.; Coverdale, C. A.; Laspe, A. R.; Flanagan, T. M.; Moore, N. W.; Sinars, D. B.; Lamppa, D. C.; Harding, E. C.; Sygar, W. A.; Savage, M. E.; Moore, J. K.; Focia, R.; Wagoner, T. C.; Killebrew, K. L. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States); and others

2014-05-15T23:59:59.000Z

58

Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV  

SciTech Connect (OSTI)

We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/BAT all-sky survey. Among the newly BAT-discovered clusters there are: Bullet, Abell 85, Norma, and PKS 0745-19. Norma is the only cluster, among those presented here, which is resolved by BAT. For all the clusters we perform a detailed spectral analysis using XMM-Newton and Swift/BAT data to investigate the presence of a hard (non-thermal) X-ray excess. We find that in most cases the clusters emission in the 0.3-200 keV band can be explained by a multi-temperature thermal model confirming our previous results. For two clusters (Bullet and Abell 3667) we find evidence for the presence of a hard X-ray excess. In the case of the Bullet cluster, our analysis confirms the presence of a non-thermal, power-law like, component with a 20-100 keV flux of 3.4 x 10{sup -12} erg cm{sup -2} s{sup -1} as detected in previous studies. For Abell 3667 the excess emission can be successfully modeled as a hot component (kT = {approx}13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely thermal origin.

Ajello, M.; /SLAC /KIPAC, Menlo Park; Rebusco, P.; /KIPAC, Menlo Park; Cappelluti, N.; /Garching, Max Planck Inst., MPE /Maryland U., Baltimore County; Reimer, O.; /SLAC /Palermo Observ.; Boehringer, H.; /Garching, Max Planck Inst., MPE; La Parola, V.; Cusumano, G.; /Palermo Observ.; ,

2010-10-27T23:59:59.000Z

59

New Observations of the Solar 0.5-5 keV Soft X-ray Spectrum  

E-Print Network [OSTI]

The solar corona is orders of magnitude hotter than the underlying photosphere, but how the corona attains such high temperatures is still not understood. Soft X-ray (SXR) emission provides important diagnostics for thermal processes in the high-temperature corona, and is also an important driver of ionospheric dynamics at Earth. There is a crucial observational gap between ~0.2 and ~4 keV, outside the ranges of existing spectrometers. We present observations from a new SXR spectrometer, the Amptek X123-SDD, which measured the spatially-integrated solar spectral irradiance from ~0.5 to ~5 keV, with ~0.15 keV FWHM resolution, during sounding rocket flights on 2012 June 23 and 2013 October 21. These measurements show that the highly variable SXR emission is orders of magnitude greater than that during the deep minimum of 2009, even with only weak activity. The observed spectra show significant high-temperature (5-10 MK) emission and are well fit by simple power-law temperature distributions with indices of ~6, ...

Caspi, Amir; Warren, Harry P

2015-01-01T23:59:59.000Z

60

Study of 1–8 keV K-? x-ray emission from high intensity femtosecond laser produced plasma  

SciTech Connect (OSTI)

We report an experimental study on the optimization of a laser plasma based x-ray source of ultra-short duration K-? line radiation. The interaction of pulses from a CPA based Ti:sapphire laser (10 TW, 45 fs, 10 Hz) system with magnesium, titanium, iron and copper solid target generates bright 1-8 keV K-? x-ray radiation. The x-ray yield was optimized with the laser pulse duration (at fixed fluence) which is varied in the range of 45 fs to 1.4 ps. It showed a maximum at laser pulse duration of ?740 fs, 420 fs, 350 and 250 fs for Mg (1.3 keV), Ti (4.5 keV), Fe (6.4 keV) and Cu (8.05 keV) respectively. The x-ray yield is observed to be independent of the sign of the chirp. The scaling of the K-? yield (I{sub x} ? I{sub L}{sup ?}) for 45 fs and optimized pulse duration were measured for laser intensities in the region of 3 × 10{sup 14} – 8 × 10{sup 17}. The x-ray yield shows a much faster scaling exponent ? = 1.5, 2.1, 2.4 and 2.6 for Mg, Ti, Fe and Cu respectively at optimized pulse duration compared to scaling exponent of 0.65, 1.3, 1.5, and 1.7 obtained for 45 fs duration laser pulses. The laser to x-ray energy conversion efficiencies obtained for different target materials are ?{sub Mg} = 1.2 × 10{sup ?5}, ?{sub Ti} = 3.1 × 10{sup ?5}, ?{sub Fe} = 2.7 × 10{sup ?5}, ?{sub Cu} = 1.9 × 10{sup ?5}. The results have been explained from the efficient generation of optimal energy hot electrons at longer laser pulse duration. The faster scaling observed at optimal pulse duration indicates that the x-ray source is generated at the target surface and saturation of x-ray emission would appear at larger laser fluence. An example of utilization of the source for measurement of shock-wave profiles in a silicon crystal by time resolved x-ray diffraction is also presented.

Arora, V., E-mail: arora@rrcat.gov.in; Naik, P. A.; Chakera, J. A.; Bagchi, S.; Tayyab, M.; Gupta, P. D. [Laser Plasma Division, Raja Rammana Centre for Advanced Technology, Indore 452 013 (India)] [Laser Plasma Division, Raja Rammana Centre for Advanced Technology, Indore 452 013 (India)

2014-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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.
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61

Simulations of Microchannel Plate Sensitivity to <20 keV X-rays as a Function of Energy and Incident Angle  

SciTech Connect (OSTI)

We present results of Monte Carlo simulations of microchannel plate (MCP) response to x-rays in the 250 eV to 20 keV energy range as a function of both x-ray energy and impact angle. The model is based on the model presented in Rochau et al. (2006). However, while the Rochau et al. (2006) model was two-dimensional, and their results only went to 5 keV, our results have been expanded to 20 keV, and our model has been incorporated into a three-dimensional Monte Carlo MCP model that we have developed over the past several years (Kruschwitz et al. 2011). X-ray penetration through multiple MCP pore walls is increasingly important above 5 keV. The effect of x-ray penetration through multiple pores on MCP performance was studied and is presented.

Kruschwitz, Craig [NSTec; Wu, M. [SNL; Rochau, G. A. [SNL

2013-06-13T23:59:59.000Z

62

Scattering of 64 eV to 3 keV Neutrons from Polyethylene and Graphite and the Coherence Length Problem  

E-Print Network [OSTI]

Scattering of 64 eV to 3 keV Neutrons from Polyethylene and Graphite and the Coherence Length intensity ratios from polyethylene (CH2) relative to graphite (C) at several discrete final energies

Danon, Yaron

63

Search for Anomalous Scattering of keV Neutrons from H2O-D2O Mixtures R. Moreh,1,2,* R. C. Block,2  

E-Print Network [OSTI]

Search for Anomalous Scattering of keV Neutrons from H2O-D2O Mixtures R. Moreh,1,2,* R. C. Block,2 (Received 20 January 2005; published 12 May 2005) We measured the neutron scattering intensities from pure Linac and the final energy of the scattered neutrons was fixed at 24.3 keV using a 20 cm thick pure iron

Danon, Yaron

64

Chain-oxygen ordering in twin-free YBa2Cu3O7-single crystals driven by 20-keV electron irradiation  

E-Print Network [OSTI]

Chain-oxygen ordering in twin-free YBa2Cu3O7- single crystals driven by 20-keV electron irradiation 2005 We have examined the effects of 20-keV electron irradiation on the -Cu 1 -O 1 - n chain-oxygen arrange- ments in oxygen-deficient but otherwise twin-free YBa2Cu3O7- single crystals. Comparison

Johansen, Tom Henning

65

Neutron Capture and Total Cross-Section Measurements and Resonance Parameter Analysis of Zirconium up to 2.5 keV  

E-Print Network [OSTI]

up to 2.5 keV G. Leinweber,* J. Burke, C. R. Lubitz, H. D. Knox, and N. J. Drindak Lockheed Martin resonances up to 2.5 keV. The zirconium reso- nance parameters Gg and Gn, determined in the present- rameter extraction. Recent work at RPI using the up- graded equipment is given by Danon et al.5 for rare

Danon, Yaron

66

Measurement of the neutron capture cross section of the s-only isotope 204Pb from 1 eV to 440 keV  

E-Print Network [OSTI]

The neutron capture cross section of 204Pb has been measured at the CERN n_TOF installation with high resolution in the energy range from 1 eV to 440 keV. An R-matrix analysis of the resolved resonance region, between 1 eV and 100 keV, was carried out using the SAMMY code. In the interval between 100 keV and 440 keV we report the average capture cross section. The background in the entire neutron energy range could be reliably determined from the measurement of a 208Pb sample. Other systematic effects in this measurement could be investigated and precisely corrected by means of detailed Monte Carlo simulations. We obtain a Maxwellian average capture cross section for 204Pb at kT=30 keV of 79(3) mb, in agreement with previous experiments. However our cross section at kT=5 keV is about 35% larger than the values reported so far. The implications of the new cross section for the s-process abundance contributions in the Pb/Bi region are discussed.

C. Domingo-Pardo

2006-10-24T23:59:59.000Z

67

A survey for Fe 6.4 keV emission in young stellar objects in rho Oph: the strong fluorescence from Elias 29  

E-Print Network [OSTI]

We report the results of a search for 6.4 keV Fe fluorescent emission in Young Stellar Objects (YSOs) with measured accretion luminosities in the rho Oph cloud, using all existing chandra and XMM-Newton observations of the region. A total of nine such YSOs have X-ray data with sufficiently high S/N for the 6.4 keV line to be potentially detected if present. A positive detection of the Fe 6.4 keV line is reported for one object, Elias 29, in both the XMM-Newton and the chandra data. The 6.4 keV line is detected in Elias 29 both during quiescent and flaring emission, unlikely all previously reported detections of 6.4 keV Fe fluorescence in YSOs which were made during intense flaring. The observed equivalent width of the fluorescent line is large, at W_alpha approx 140 eV, ruling out fluorescence from diffuse circumstellar material. It is also larger than expected for simple reflection from a solar-composition photosphere or circumstellar disk, but it is compatible with being due to fluorescence from a centrally illuminated circumstellar disk. The X-ray spectrum of Elias 29 is also peculiar in terms of its high (ionized) Fe abundance, as evident from the very intense Fe xxv 6.7 keV line emission; we speculate on the possible mechanism leading to the observed high abundance.

F. Favata; G. Micela; B. Silva; S. Sciortino; M. Tsujimoto

2004-12-20T23:59:59.000Z

68

Measurement of the ionization yield of nuclear recoils in liquid argon at 80 and 233 keV  

E-Print Network [OSTI]

The energy calibration of nuclear recoil detectors is of primary importance to rare-event experiments such as those of direct dark matter search and coherent neutrino-nucleus scattering. In particular, such a calibration is performed by measuring the ionization yield of nuclear recoils in liquid Ar and Xe detection media, using neutron elastic scattering off nuclei. In the present work, the ionization yield for nuclear recoils in liquid Ar has for the first time been measured in the higher energy range, at 80 and 233 keV, using a two-phase Cryogenic Avalanche Detector (CRAD) and DD neutron generator. The ionization yield in liquid Ar at an electric field of 2.3 kV/cm amounted to 7.8+/-1.1 and 9.7+/-1.3 e-/keV at 80 and 233 keV respectively. The Jaffe model for nuclear recoil-induced ionization, in contrast to that Thomas-Imel, can probably consistently describe the energy dependence of the ionization yield.

A. Bondar; A. Buzulutskov; A. Dolgov; E. Grishnyaev; S. Polosatkin; L. Shekhtman; E. Shemyakina; A. Sokolov

2014-09-23T23:59:59.000Z

69

Revisiting the relationship between 6 {\\mu}m and 2-10 keV continuum luminosities of AGN  

E-Print Network [OSTI]

We have determined the relation between the AGN luminosities at rest-frame 6 {\\mu}m associated to the dusty torus emission and at 2-10 keV energies using a complete, X-ray flux limited sample of 232 AGN drawn from the Bright Ultra-hard XMM-Newton Survey. The objects have X-ray luminosities corrected for intrinsic absorption between 10^42 and 10^46 erg/s and redshifts from 0.05 to 2.8. The rest-frame 6 {\\mu}m luminosities were computed using data from the Wide-Field Infrared Survey Explorer and are based on a spectral energy distribution decomposition into AGN and galaxy emission. The best-fit relationship for the full sample is consistent with being linear, L_6 {\\mu}m $\\propto$ L_2-10 keV^0.99$\\pm$0.032, but has significant intrinsic scatter, ~0.35 dex in log L_6 {\\mu}m. Assuming a constant X-ray bolometric correction, the fraction of AGN bolometric luminosity reprocessed in the mid-IR decreases weakly, if at all, with the AGN luminosity, a finding at odds with simple receding torus models. Type 2 AGN have re...

Mateos, S; Alonso-Herrero, A; Rovilos, E; Hernán-Caballero, A; Barcons, X; Blain, A; Caccianiga, A; Della Ceca, R; Severgnini, P

2015-01-01T23:59:59.000Z

70

Improving the energy response of external beam therapy (EBT) GafChromic{sup TM} dosimetry films at low energies (?100 keV)  

SciTech Connect (OSTI)

Purpose: Purpose of this work is to investigate the effects of varying the active layer composition of external beam therapy (EBT) GafChromic{sup TM} films on the energy dependence of the film, as well as try to develop a new prototype with more uniform energy response at low photon energies (?100?keV). Methods: First, the overall energy response (S{sub AD,} {sub W}(Q)) of different commercial EBT type film models that represent the three different generations produced to date, i.e., EBT, EBT2, and EBT3, was investigated. Pieces of each film model were irradiated to a fixed dose of 2 Gy to water for a wide range of beam qualities and the corresponding S{sub AD,} {sub W}(Q) was measured using a flatbed document scanner. Furthermore, the DOSRZnrc Monte Carlo code was used to determine the absorbed dose to water energy dependence of the film, f(Q). Moreover, the intrinsic energy dependence, k{sub bq}(Q), for each film model was evaluated using the corresponding S{sub AD,} {sub W}(Q) and f(Q). In the second part of this study, the authors investigated the effects of changing the chemical composition of the active layer on S{sub AD,} {sub W}(Q). Finally, based on these results, the film manufacturer fabricated several film prototypes and the authors evaluated their S{sub AD,} {sub W}(Q). Results: The commercial EBT film model shows an under response at all energies below 100 keV reaching 39% ± 4% at about 20 keV. The commercial EBT2 and EBT3 film models show an under response of about 27% ± 4% at 20 keV and an over response of about 16% ± 4% at 40?keV.S{sub AD,} {sub W}(Q) of the three commercial film models at low energies show strong correlation with the corresponding f{sup ?1}(Q) curves. The commercial EBT3 model with 4% Cl in the active layer shows under response of 22% ± 4% at 20 keV and 6% ± 4% at about 40?keV. However, increasing the mass percent of chlorine makes the film more hygroscopic which may affect the stability of the film's readout. The EBT3 film prototype with 7.5% Si shows a significant improvement in the energy response at very low energies compared to the commercial EBT3 films with 4% Cl. It shows under response of 15% ± 5% at about 20 keV to 2% ± 5% at about 40?keV. However, according to the manufacturer, the addition of 7.5% Si as SiO{sub 2} adversely affected the viscosity of the active fluid and therefore affected the potential use in commercial machine coating. The latest commercial EBT3 film model with 7% Al as Al{sub 2}O{sub 3} shows an overall improvement in S{sub AD,} {sub W}(Q) compared to previous commercial EBT3 films. It shows under response at all energies <100 keV, varying from 20% ± 4% at 20 keV to 6% ± 4% at 40?keV. Conclusions: The energy response of films in the energy range <100 keV can be improved by adjusting the active layer chemical composition. Removing bromine eliminated the over response at about 40?keV. The under response at energies ?30 keV is improved by adding 7% Al to the active layer in the latest commercial EBT3 film models.

Bekerat, H., E-mail: hamed.bekerat@mail.mcgill.ca; Devic, S.; DeBlois, F. [Medical Physics Unit, McGill University, Montréal, Québec H3G 1A4, Canada and Department of Radiation Oncology, Jewish General Hospital, Montréal, Québec H3T 1E2 (Canada)] [Medical Physics Unit, McGill University, Montréal, Québec H3G 1A4, Canada and Department of Radiation Oncology, Jewish General Hospital, Montréal, Québec H3T 1E2 (Canada); Singh, K.; Sarfehnia, A.; Seuntjens, J. [Medical Physics Unit, McGill University, Montréal, Québec H3G 1A4 (Canada)] [Medical Physics Unit, McGill University, Montréal, Québec H3G 1A4 (Canada); Shih, Shelley; Yu, Xiang; Lewis, D. [Ashland Specialty Ingredients, 1361 Alps Road, Wayne, New Jersey 07470 (United States)] [Ashland Specialty Ingredients, 1361 Alps Road, Wayne, New Jersey 07470 (United States)

2014-02-15T23:59:59.000Z

71

Characterizations of MCP performance in the hard x-ray range (6–25 keV)  

SciTech Connect (OSTI)

MCP detector performance at hard x-ray energies from 6 to 25 keV was recently investigated using NSLS beamline X15A at BNL. Measurements were made with an NSTec Gen-II (H-CA-65) framing camera, based on a Photonis MCP with ?10 ?m in diameter pores, ?12 ?m center-center spacing, an L/D ratio of 46, and a bias angle of 8°. The MCP characterizations were focused on (1) energy and angle dependent sensitivity, (2) energy and angle dependent spatial resolution, (3) energy dependent gain performance, and (4) energy dependent dynamic range. These measurement corroborated simulation results using a Monte Carlo model that included hard x-ray interactions and the subsequent electron cascade in the MCP.

Wu, Ming, E-mail: minwu@sandia.gov; Rochau, Greg [Sandia National Laboratory, Albuquerque, New Mexico 87185 (United States); Moy, Ken [Special Technology Laboratories, NSTec, Santa Barbara, California 93111-2335 (United States); Kruschwitz, Craig [National Security Technologies, LLC, Los Alamos Operations, Los Alamos, New Mexico 87544 (United States)

2014-11-15T23:59:59.000Z

72

Differential cross sections for single ionization of H{sub 2} by 75-keV proton impact  

SciTech Connect (OSTI)

We have calculated triply differential cross sections (TDCS) and doubly differential cross sections (DDCS) for single ionization of H{sub 2} by 75-keV proton impact using the molecular three-body distorted-wave-eikonal initial-state (M3DW-EIS) approach. Previously published measured DDCS (differential in the projectile scattering angle and integrated over the ejected electron angles) found pronounced structures at relatively large angles that were interpreted as an interference resulting from the two-centered potential of the molecule. Theory treating H{sub 2} as atomic H multiplied by a molecular interference factor only predicts the observed structure when assumptions are made about the molecular orientation. Here we apply the M3DW-EIS method, which does not rely on such an ad hoc approach, but rather treats the interference from first principles.

Chowdhury, U.; Schulz, M.; Madison, D. H. [Missouri University of Science and Technology, Department of Physics and Laboratory for Atomic, Molecular, and Optical Research, Rolla, Missouri 65401 (United States)

2011-03-15T23:59:59.000Z

73

Absolute calibration of image plates for electrons at energy between 100 keV and 4 MeV  

SciTech Connect (OSTI)

We measured the absolute response of image plate (Fuji BAS SR2040) for electrons at energies between 100 keV and 4 MeV using an electron spectrometer. The electron source was produced from a short pulse laser irradiated on solid density targets. This paper presents the calibration results of image plate photon stimulated luminescence per electron at this energy range. The Monte Carlo radiation transport code MCNPX results are also presented for three representative incident angles onto the image plates and corresponding electron energy depositions at these angles. These provide a complete set of tools that allows extraction of our absolute calibration to other spectrometer setting at this electron energy range.

Chen Hui; Back, Norman L.; Eder, David C.; MacPhee, Andrew G.; Ping Yuan; Song, Peter M.; Throop, Alan [Lawrence Livermore National Laboratory, Livermore, California 94550-9234 (United States); Bartal, Teresa; Beg, F. N. [University of California, San Diego, La Jolla, California 92093 (United States); Link, Anthony J.; Van Woerkom, Linn [Ohio State University, Columbus, Ohio 43210 (United States)

2008-03-15T23:59:59.000Z

74

$?_R$ dark matter-philic Higgs for 3.5 keV X-ray signal  

E-Print Network [OSTI]

We suggest a new model in which a dark matter-philic Higgs is included to discriminate the interaction between dark matter and other particles, to explain the recent observation of the $7~ {\\rm keV}$ X-ray line signal by XMM-Newton observatory. The smallness of the vacuum expectation value of dark matter-philic Higgs can achieve the small mixing angle of the dark matter right-handed neutrino with the ordinary one. We show the range of the symmetry breaking scales as well as the observed dark matter properties are satisfied. In our model, the value of the vacuum expectation value of dark matter-philic Higgs should be about $0.17~ {\\rm GeV}$.

Naoyuki Haba; Hiroyuki Ishida; Ryo Takahashi

2014-08-05T23:59:59.000Z

75

12.6 keV Kr K-alpha X-ray Source For High Energy Density Physics Experiments  

SciTech Connect (OSTI)

A high contrast 12.6 keV Kr K{alpha} source has been demonstrated on the petawatt-class Titan laser facility. The contrast ratio (K{alpha} to continuum) is 65, with a competitive ultra short pulse laser to x-ray conversion efficiency of 10{sup -5}. Filtered shadowgraphy indicates that the Kr K{alpha} and K{beta} x-rays are emitted from a roughly 1 x 2 mm emission volume, making this source suitable for area backlighting and scattering. Spectral calculations indicate a typical bulk electron temperature of 50-70 eV (i.e. mean ionization state 13-16), based on the observed ratio of K{alpha} to K{beta}. Kr gas jets provide a debris-free high energy K{alpha} source for time-resolved diagnosis of dense matter.

Kugland, N; Constantin, C G; Niemann, C; Neumayer, P; Chung, H; Doppner, T; Kemp, A; Glenzer, S H; Girard, F

2008-04-22T23:59:59.000Z

76

Two-axis sagittal focusing monochromator  

DOE Patents [OSTI]

An x-ray focusing device and method for adjustably focusing x-rays in two orthogonal directions simultaneously. The device and method can be operated remotely using two pairs of orthogonal benders mounted on a rigid, open frame such that x-rays may pass through the opening in the frame. The added x-ray flux allows significantly higher brightness from the same x-ray source.

Haas, Edwin G; Stelmach, Christopher; Zhong, Zhong

2014-05-13T23:59:59.000Z

77

Multiple wavelength X-ray monochromators  

DOE Patents [OSTI]

An improved apparatus and method is provided for separating input x-ray radiation containing first and second x-ray wavelengths into spatially separate first and second output radiation which contain the first and second x-ray wavelengths, respectively. The apparatus includes a crystalline diffractor which includes a first set of parallel crystal planes, where each of the planes is spaced a predetermined first distance from one another. The crystalline diffractor also includes a second set of parallel crystal planes inclined at an angle with respect to the first set of crystal planes where each of the planes of the second set of parallel crystal planes is spaced a predetermined second distance from one another. In one embodiment, the crystalline diffractor is comprised of a single crystal. In a second embodiment, the crystalline diffractor is comprised of a stack of two crystals. In a third embodiment, the crystalline diffractor includes a single crystal that is bent for focusing the separate first and second output x-ray radiation wavelengths into separate focal points. 3 figs.

Steinmeyer, P.A.

1992-11-17T23:59:59.000Z

78

A survey for Fe 6.4 keV emission in young stellar objects in rho Oph: the strong fluorescence from Elias 29  

E-Print Network [OSTI]

We report the results of a search for 6.4 keV Fe fluorescent emission in Young Stellar Objects (YSOs) with measured accretion luminosities in the rho Oph cloud, using all existing chandra and XMM-Newton observations of the region. A total of nine such YSOs have X-ray data with sufficiently high S/N for the 6.4 keV line to be potentially detected if present. A positive detection of the Fe 6.4 keV line is reported for one object, Elias 29, in both the XMM-Newton and the chandra data. The 6.4 keV line is detected in Elias 29 both during quiescent and flaring emission, unlikely all previously reported detections of 6.4 keV Fe fluorescence in YSOs which were made during intense flaring. The observed equivalent width of the fluorescent line is large, at W_alpha approx 140 eV, ruling out fluorescence from diffuse circumstellar material. It is also larger than expected for simple reflection from a solar-composition photosphere or circumstellar disk, but it is compatible with being due to fluorescence from a centrally...

Favata, F; Silva, B; Sciortino, S; Tsujimoto, M

2004-01-01T23:59:59.000Z

79

Categorical Exclusion Determinations: B5.16 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartmentTie Ltd:JuneNovember 26, 2014 CX-100126A5Arkansas25421706 Categorical

80

Microsoft Word - Chap3 5-16-05.doc  

Office of Legacy Management (LM)

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81

Measurement of high-energy (10–60 keV) x-ray spectral line widths with eV accuracy  

SciTech Connect (OSTI)

A high resolution crystal spectrometer utilizing a crystal in transmission geometry has been developed and experimentally optimized to measure the widths of emission lines in the 10–60 keV energy range with eV accuracy. The spectrometer achieves high spectral resolution by utilizing crystal planes with small lattice spacings (down to 2d = 0.099 nm), a large crystal bending radius and Rowland circle diameter (965 mm), and an image plate detector with high spatial resolution (60 ?m in the case of the Fuji TR image plate). High resolution W L-shell and K-shell laboratory test spectra in the 10–60 keV range and Ho K-shell spectra near 47 keV recorded at the LLNL Titan laser facility are presented. The Ho K-shell spectra are the highest resolution hard x-ray spectra recorded from a solid target irradiated by a high-intensity laser.

Seely, J. F., E-mail: seelyjf@gmail.com; Feldman, U. [Artep Inc., 2922 Excelsior Springs Court, Ellicott City, Maryland 21042 (United States); Glover, J. L.; Hudson, L. T.; Ralchenko, Y.; Henins, Albert [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Pereira, N. [Ecopulse Inc., P. O. Box 528, Springfield, Virginia 22152 (United States); Di Stefano, C. A.; Kuranz, C. C.; Drake, R. P. [University of Michigan, Ann Arbor, Michigan 48109 (United States); Chen, Hui; Williams, G. J.; Park, J. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

2014-11-15T23:59:59.000Z

82

Neutron Resonance Parameters of 238U and the Calculated Cross Sections from the Reich-Moore Analysis of Experimental Data in the Neutron Energy Range from 0 keV to 20 keV  

SciTech Connect (OSTI)

The neutron resonance parameters of {sup 238}U were obtained from a SAMMY analysis of high-resolution neutron transmission measurements and high-resolution capture cross section measurements performed at the Oak Ridge Electron Linear Accelerator (ORELA) in the years 1970-1990, and from more recent transmission and capture cross section measurements performed at the Geel Linear Accelerator (GELINA). Compared with previous evaluations, the energy range for this resonance analysis was extended from 10 to 20 keV, taking advantage of the high resolution of the most recent ORELA transmission measurements. The experimental database and the method of analysis are described in this report. The neutron transmissions and the capture cross sections calculated with the resonance parameters are compared with the experimental data. A description is given of the statistical properties of the resonance parameters and of the recommended values of the average parameters. The new evaluation results in a slight decrease of the effective capture resonance integral and improves the prediction of integral thermal benchmarks by 70 pcm to 200 pcm.

Derrien, H

2005-12-05T23:59:59.000Z

83

Search for 14.4 keV solar axions from M1 transition of Fe-57 with CUORE crystals  

E-Print Network [OSTI]

We report the results of a search for axions from the 14.4 keV M1 transition from Fe-57 in the core of the sun using the axio-electric e?ect in TeO2 bolometers. The detectors are 5x5x5 cm3 crystals operated at about 10 mK in a facility used to test bolometers for the CUORE experiment at the Laboratori Nazionali del Gran Sasso in Italy. An analysis of 43.65 kg d of data was made using a newly developed low energy trigger which was optimized to reduce the detectors energy threshold. An upper limit of 0.63 c kg-1 d-1 was established at 95% C.L.. From this value, a lower bound at 95% C.L. was placed on the Peccei-Quinn energy scale of fa >= 0.76 10**6 GeV for a value of S=0.55 for the flavor-singlet axial vector matrix element. Bounds are given for the interval 0.15 < S < 0.55.

The Cuore Collaboration; F. Alessandria; R. Ardito; D. R. Artusa; F. T. Avignone III; O. Azzolini; M. Balata; T. I. Banks; G. Bari; J. Beeman; F. Bellini; A. Bersani; M. Biassoni; T. Bloxham; C. Brofferio; C. Bucci; X. Z. Cai; L. Canonica; S. Capelli; L. Carbone; L. Cardani; M. Carrettoni; N. Casali; N. Chott; M. Clemenza; C. Cosmelli; O. Cremonesi; R. J. Creswick; I. Dafinei; A. Dally; V. Datskov; A. De Biasi; M. P. Decowski; M. M. Deninno; S. Di Domizio; M. L. di Vacri; L. Ejzak; R. Faccini; D. Q. Fang; H. A. Farach; E. Ferri; F. Ferroni; E. Fiorini; M. A. Franceschi; S. J. Freedman; B. K. Fujikawa; A. Giachero; L. Gironi; A. Giuliani; J. Goett; P. Gorla; C. Gotti; E. Guardincerri; T. D. Gutierrez; E. E. Haller; K. Han; K. M. Heeger; H. Z. Huang; R. Kadel; K. Kazkaz; G. Keppel; L. Kogler; Yu. G. Kolomensky; D. Lenz; Y. L. Li; C. Ligi; X. Liu; Y. G. Ma; C. Maiano; M. Maino; M. Martinez; R. H. Maruyama; N. Moggi; S. Morganti; T. Napolitano; S. Newman; S. Nisi; C. Nones; E. B. Norman; A. Nucciotti; F. Orio; D. Orlandi; J. L. Ouellet; M. Pallavicini; V. Palmieri; L. Pattavina; M. Pavan; M. Pedretti; G. Pessina; S. Pirro; E. Previtali; V. Rampazzo; F. Rimondi; C. Rosenfeld; C. Rusconi; S. Sangiorgio; N. D. Scielzo; M. Sisti; A. R. Smith; L. Taffarello; M. Tenconi; W. D. Tian; C. Tomei; S. Trentalange; G. Ventura; M. Vignati; B. S. Wang; H. W. Wang; C. A. Whitten Jr.; T. Wise; A. Woodcraft; L. Zanotti; C. Zarra; B. X. Zhu; S. Zucchelli

2013-04-26T23:59:59.000Z

84

60 keV Ar{sup +}-ion induced modification of microstructural, compositional, and vibrational properties of InSb  

SciTech Connect (OSTI)

Room temperature irradiation of InSb(111) by 60?keV Ar{sup +}-ions at normal (0°) and oblique (60°) angles of incidence led to the formation of nanoporous structure in the high fluence regime of 1?×?10{sup 17} to 3?×?10{sup 18} ions cm{sup ?2}. While a porous layer comprising of a network of interconnected nanofibers was generated by normal ion incidence, evolution of plate-like structures was observed for obliquely incident ions. Systematic studies of composition and structure using energy dispersive x-ray spectroscopy, Raman spectroscopy, x-ray photoelectron spectroscopy, Raman mapping, grazing incidence x-ray diffraction, and cross-sectional transmission electron microscopy revealed a high degree of oxidation of the ion-induced microstructures with the presence of In{sub 2}O{sub 3} and Sb{sub 2}O{sub 3} phases and presence of nanocrystallites within the nanoporous structures. The observed structural evolution was understood in terms of processes driven by ion-induced defect accumulation within InSb.

Datta, D. P.; Garg, S. K.; Som, T., E-mail: tsom@iopb.res.in [SUNAG Laboratory, Institute of Physics, Bhubaneswar, Odisha 751005 (India); Satpati, B. [Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India); Sahoo, P. K. [School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, Odisha (India); Kanjilal, A. [Department of Physics, Shiv Nadar University, Uttar Pradesh 203207 (India); Dhara, S. [Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India); Kanjilal, D. [Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India)

2014-10-14T23:59:59.000Z

85

Finite-Hilbert-basis-set calculations for the angular distribution of ionized electrons produced in p+H impact at 20 keV  

E-Print Network [OSTI]

We present a different method of extracting the angular distribution of ejected electrons in an ion-atom collision from a two-centered finite Hilbert basis-set calculation. We obtain good agreement with experiment for a p+H collision at 20 keV if we...

Reading, John F.; Fu, J.; Fitzpatrick, M. J.

2004-01-01T23:59:59.000Z

86

Implementation of low-energy surface-induced dissociation (eV SID) and high-energy collision-induced dissociation (keV CID)  

E-Print Network [OSTI]

Implementation of low-energy surface-induced dissociation (eV SID) and high-energy collision is that the instrument implements both high-energy collision-induced dissociation (keV CID) and low-energy surface energy expression, E mv2 /2. As pointed out in the foreword to Cotter's book on TOF mass spectrometry [1

Wysocki, Vicki H.

87

Capture of a neutron to excited states of a {sup 9}Be nucleus taking into account resonance at 622 keV  

SciTech Connect (OSTI)

Radiative capture of a neutron to the ground and excited states of the 9Be nucleus is considered using the potential cluster model with forbidden states and with classification of cluster states by the Young schemes taking into account resonance at 622 keV for thermal and astrophysical energies.

Dubovichenko, S. B., E-mail: dubovichenko@gmail.com [National Space Agency of the Republic of Kazakhstan, Fessenkov Astrophysical Institute, National Space Research and Technologies Center (Kazakhstan)

2013-10-15T23:59:59.000Z

88

Comparative Dosimetric Estimates of a 25 keV Electron Micro-beam with three Monte Carlo Codes  

SciTech Connect (OSTI)

The calculations presented compare the different performances of the three Monte Carlo codes PENELOPE-1999, MCNP-4C and PITS, for the evaluation of Dose profiles from a 25 keV electron micro-beam traversing individual cells. The overall model of a cell is a water cylinder equivalent for the three codes but with a different internal scoring geometry: hollow cylinders for PENELOPE and MCNP, whereas spheres are used for the PITS code. A cylindrical cell geometry with scoring volumes with the shape of hollow cylinders was initially selected for PENELOPE and MCNP because of its superior simulation of the actual shape and dimensions of a cell and for its improved computer-time efficiency if compared to spherical internal volumes. Some of the transfer points and energy transfer that constitute a radiation track may actually fall in the space between spheres, that would be outside the spherical scoring volume. This internal geometry, along with the PENELOPE algorithm, drastically reduced the computer time when using this code if comparing with event-by-event Monte Carlo codes like PITS. This preliminary work has been important to address dosimetric estimates at low electron energies. It demonstrates that codes like PENELOPE can be used for Dose evaluation, even with such small geometries and energies involved, which are far below the normal use for which the code was created. Further work (initiated in Summer 2002) is still needed however, to create a user-code for PENELOPE that allows uniform comparison of exact cell geometries, integral volumes and also microdosimetric scoring quantities, a field where track-structure codes like PITS, written for this purpose, are believed to be superior.

Mainardi, Enrico; Donahue, Richard J.; Blakely, Eleanor A.

2002-09-11T23:59:59.000Z

89

The response of a fast phosphor screen scintillator (ZnO:Ga) to low energy ions (0-60 keV)  

SciTech Connect (OSTI)

ZnO:Ga is a promising, high time resolution candidate for use as a fast-ion-loss detector in TJ-II. We compare its ionoluminescence with that of the standard fast-ion-loss detector material, SrGa{sub 2}S{sub 4}:Eu (also known as TG-Green), when irradiated by H{sup +} ions with a range of energies E{<=}60 keV using a dedicated laboratory setup. It is found that ZnO:Ga is a reasonably good candidate for detecting low energy (E<60 keV) ions as it has excellent time resolution; however, its sensitivity is about 100 times lower than TG-Green, potentially limiting it to applications with high energy ion loss signals.

Jimenez-Rey, D. [Centro de Micro-Analisis de Materiales, Universidad Autonoma de Madrid, C/ Faraday 3, Campus de Cantoblanco, E-28049 Madrid (Spain); Zurro, B.; Baciero, A.; Navarro, M. [Laboratorio Nacional de Fusion, Asociacion Euratom-CIEMAT, Av. Complutense 22, E-28040 Madrid (Spain); Rodriguez-Barquero, L. [Laboratorio de Metrologia de Radiaciones lonizantes, CIEMAT, Av. Complutense 22, E-28040 Madrid (Spain)

2010-10-15T23:59:59.000Z

90

Common Origin of 3.55 keV X-Ray Line and Galactic Center Gamma Ray Excess in a Radiative Neutrino Mass Model  

E-Print Network [OSTI]

We attempt to simultaneously explain the recently observed 3.55 keV X-ray line in the analysis of XMM-Newton telescope data and the galactic center gamma ray excess observed by the Fermi gamma ray space telescope within an abelian gauge extension of standard model. We consider a two component dark matter scenario with a mass difference 3.55 keV such that the heavier one can decay into the lighter one and a photon with energy 3.55 keV. The lighter dark matter candidate is protected from decaying into the standard model particles by a remnant $Z_2$ symmetry into which the abelian gauge symmetry gets spontaneously broken. If the mass of the dark matter particle is chosen to be within $31-40$ GeV, then this model can also explain the galactic center gamma ray excess if the dark matter annihilation into $b\\bar{b}$ pairs has a cross section of $\\langle \\sigma v \\rangle \\simeq (1.4-2.0) \\times 10^{-26} \\; \\text{cm}^3/\\text{s}$. We constrain the model from the requirement of producing correct dark matter relic densit...

Borah, Debasish; Adhikari, Rathin

2015-01-01T23:59:59.000Z

91

Measurement of the 183 keV Resonance in 17O(p,alpha)14N using a Novel Technique  

SciTech Connect (OSTI)

We have developed a novel technique for measurements of low energy (p,alpha) reactions using heavy ion beams and a differentially-pumped windowless gas target. We applied this new approach to study the 183 keV resonance in the 17O(p,alpha)14}N reaction. We report a resonance energy (center-of-mass) of 183.5{+0.1}{-0.4} keV, a resonance strength of 1.70 +/- 0.15 meV, and set an upper limit (95\\% confidence) on the total width of the state of < 0.1 keV. This resonance is important for the 17O(p,alpha)14}N reaction rate, and we find that 18F production is significantly decreased in low mass ONeMg novae but less affected in more energetic novae. We also report the first determination of the stopping power for oxygen ions in hydrogen gas near the peak of the Bragg curve (E=193 keV/u) to be (63+/-1)e-15 eV-cm2.

Moazen, Brian H [ORNL; Bardayan, Daniel W [ORNL; Blackmon, Jeff C [ORNL; Chae, Kyung Yuk [ORNL; Chipps, Kelly A [ORNL; Domizioli, Carlo P [ORNL; Fitzgerald, Ryan [ORNL; Greife, Uwe [ORNL; Hix, William Raphael [ORNL; Grzywacz-Jones, Kate L [ORNL; KOZUB, RAYMOND L [ORNL; Lingerfelt, Eric J [ORNL; Livesay, Jake [ORNL; Nesaraja, Caroline D [ORNL; Pain, Steven D [ORNL; Roberts, Luke F [ORNL; Shriner, Jr., John F [ORNL; Smith, Michael Scott [ORNL; Thomas, Jeffrey S [ORNL

2007-01-01T23:59:59.000Z

92

Angular scattering of 1–50 keV ions through graphene and thin carbon foils: Potential applications for space plasma instrumentation  

SciTech Connect (OSTI)

We present experimental results for the angular scattering of ?1–50 keV H, He, C, O, N, Ne, and Ar ions transiting through graphene foils and compare them with scattering through nominal ?0.5 ?g?cm{sup ?2} carbon foils. Thin carbon foils play a critical role in time-of-flight ion mass spectrometers and energetic neutral atom sensors in space. These instruments take advantage of the charge exchange and secondary electron emission produced as ions or neutral atoms transit these foils. This interaction also produces angular scattering and energy straggling for the incident ion or neutral atom that acts to decrease the performance of a given instrument. Our results show that the angular scattering of ions through graphene is less pronounced than through the state-of-the-art 0.5 ?g?cm{sup ?2} carbon foils used in space-based particle detectors. At energies less than 50 keV, the scattering angle half width at half maximum, ?{sub 1/2}, for ?3–5 atoms thick graphene is up to a factor of 3.5 smaller than for 0.5 ?g?cm{sup ?2} (?20 atoms thick) carbon foils. Thus, graphene foils have the potential to improve the performance of space-based plasma instruments for energies below ?50 keV.

Ebert, Robert W., E-mail: rebert@swri.edu [Southwest Research Institute, P. O. Drawer 28510, San Antonio, Texas 78228-0510 (United States); Allegrini, Frédéric; Fuselier, Stephen A.; Nicolaou, Georgios [Southwest Research Institute, P. O. Drawer 28510, San Antonio, Texas 78228-0510 (United States) [Southwest Research Institute, P. O. Drawer 28510, San Antonio, Texas 78228-0510 (United States); Physics and Astronomy Department, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249 (United States); Bedworth, Peter; Sinton, Steve [Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, California 94304 (United States)] [Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, California 94304 (United States); Trattner, Karlheinz J. [Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, California 94304 (United States) [Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, California 94304 (United States); Laboratory for Atmospheric and Space Physics, University of Colorado, 1234 Innovation Drive, Boulder, Colorado 80303 (United States)

2014-03-15T23:59:59.000Z

93

Efficient laser-induced 6-8 keV x-ray production from iron oxide aerogel and foil-lined cavity targets  

SciTech Connect (OSTI)

The performance of new iron-based laser-driven x-ray sources has been tested at the OMEGA laser facility for production of x rays in the 6.5-8.5 keV range. Two types of targets were experimentally investigated: low-density iron oxide aerogels (density 6-16 mg/cm{sup 3}) and stainless steel foil-lined cavity targets (steel thickness 1-5 {mu}m). The targets were irradiated by 40 beams of the OMEGA laser (500 J/beam, 1 ns pulse, wavelength 351 nm). All targets showed good coupling with the laser, with <5% of the incident laser light backscattered by the resulting plasma in all cases (typically <2.5%). The aerogel targets produced T{sub e}=2 to 3 keV, n{sub e}=0.12-0.2 critical density plasmas yielding a 40%-60% laser-to-x-ray total conversion efficiency (CE) (1.2%-3% in the Fe K-shell range). The foil cavity targets produced T{sub e}{approx} 2 keV, n{sub e}{approx} 0.15 critical density plasmas yielding a 60%-75% conversion efficiency (1.6%-2.2% in the Fe K-shell range). Time-resolved images illustrate that the volumetric heating of low-density aerogels allow them to emit a higher K-shell x-ray yield even though they contain fewer Fe atoms. However, their challenging fabrication process leads to a larger shot-to-shot variation than cavity targets.

Perez, F.; Kay, J. J.; Patterson, J. R.; Kane, J.; May, M.; Emig, J.; Colvin, J.; Gammon, S.; Satcher, J. H. Jr.; Fournier, K. B. [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States); Villette, B.; Girard, F.; Reverdin, C. [CEA DAM DIF, F-91297 Arpajon (France); Sorce, C. [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States); University of Rochester - Laboratory for Laser Energetics, 250 E. River Rd, Rochester, New York 14623-1299 (United States); Jaquez, J. [General Atomics, San Diego, California 92121 (United States)

2012-08-15T23:59:59.000Z

94

Earth X-ray albedo for cosmic X-ray background radiation in the 1--1000 keV band  

E-Print Network [OSTI]

We present calculations of the reflection of the cosmic X-ray background (CXB) by the Earth's atmosphere in the 1--1000 keV energy range. The calculations include Compton scattering and X-ray fluorescent emission and are based on a realistic chemical composition of the atmosphere. Such calculations are relevant for CXB studies using the Earth as an obscuring screen (as was recently done by INTEGRAL). The Earth's reflectivity is further compared with that of the Sun and the Moon -- the two other objects in the Solar system subtending a large solid angle on the sky, as needed for CXB studies.

E. Churazov; S. Sazonov; R. Sunyaev; M. Revnivtsev

2008-02-11T23:59:59.000Z

95

Facilities and techniques for x-ray diagnostic calibration in the 100-eV to 100-keV energy range  

SciTech Connect (OSTI)

The Lawrence Livermore National Laboratory (LLNL) has been a pioneer in the field of x-ray diagnostic calibration for more than 20 years. We have built steady state x-ray sources capable of supplying fluorescent lines of high spectral purity in the 100-eV to 100-keV energy range, and these sources have been used in the calibration of x-ray detectors, mirrors, crystals, filters, and film. This paper discusses our calibration philosophy and techniques, and describes some of our x-ray sources. Examples of actual calibration data are presented as well.

Gaines, J.L.; Wittmayer, F.J.

1986-06-01T23:59:59.000Z

96

Reduction in the intensity of solar X-ray emission in the 2- to 15-keV photon energy range and heating of the solar corona  

SciTech Connect (OSTI)

The time profiles of the energy spectra of low-intensity flares and the structure of the thermal background of the soft X-ray component of solar corona emission over the period of January-February, 2003, are investigated using the data of the RHESSI project. A reduction in the intensity of X-ray emission of the solar flares and the corona thermal background in the 2- to 15-keV photon energy range is revealed. The RHESSI data are compared with the data from the Interball-Geotail project. A new mechanism of solar corona heating is proposed on the basis of the results obtained.

Mirzoeva, I. K., E-mail: colombo2006@mail.ru [Russian Academy of Sciences, Space Research Institute (Russian Federation)

2013-04-15T23:59:59.000Z

97

Formation of submicron oxide widths on aluminum in the presence of keV electron beams and CO/sub 2/ or N/sub 2/O  

SciTech Connect (OSTI)

The purpose of this paper is to report the size of oxide islands or line widths that can be grown as smaller diameter electron beams are used for the oxidation. The implications of the potential lateral resolution available between oxide lines for electronic materials are discussed. The localize dioxide growth on thin Al films occurs in the presence of .5 to 10 keV electron beams and high vacuum level pressures of carbon dioxide or nitrous oxide. Auger electron spectroscopy shows saturation of the O (KLL) signal and depletion of the Al (LMM) signal after an exposure of 5000 l carbon dioxide with a 2 keV beam of 7 A/sq. cm. The oxide is spatially restricted to the beam impact region and is stable for long periods of time in vacuum. The most plausible mechanism for this oxide growth is dissociation of the carbon dioxide or the nitrous oxide by the electron beam in the region of impingement on or near the surface. Oxygen atoms thus formed can then react with the Al, and carbon monoxide or nitrogen desorbs.

Pitts, J.R.; Massopust, T.P.; Czanderna, A.W.; Kazmerski, L.L.

1986-03-01T23:59:59.000Z

98

Reduction of transient diffusion from 1{endash}5 keV Si{sup +} ion implantation due to surface annihilation of interstitials  

SciTech Connect (OSTI)

The reduction of transient enhanced diffusion (TED) with reduced implantation energy has been investigated and quantified. A fixed dose of 1{times}10{sup 14} cm{sup {minus}2} Si{sup +} was implanted at energies ranging from 0.5 to 20 keV into boron doping superlattices and enhanced diffusion of the buried boron marker layers was measured for anneals at 810, 950, and 1050{degree}C. A linearly decreasing dependence of diffusivity enhancement on decreasing Si{sup +} ion range is observed at all temperatures, extrapolating to {approximately}1 for 0 keV. This is consistent with our expectation that at zero implantation energy there would be no excess interstitials from the implantation and hence no TED. Monte Carlo modeling and continuum simulations are used to fit the experimental data. The results are consistent with a surface recombination length for interstitials of {lt}10 nm. The data presented here demonstrate that in the range of annealing temperatures of interest for p-n junction formation, TED is reduced at smaller ion implantation energies and that this is due to increased interstitial annihilation at the surface. {copyright} {ital 1997 American Institute of Physics.}

Agarwal, A.; Gossmann, H.-.; Eaglesham, D.J.; Pelaz, L.; Jacobson, D.C. [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States); Haynes, T.E. [Oak Ridge National Laboratory, MS-6048, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States)] [Oak Ridge National Laboratory, MS-6048, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States); Erokhin, Y.E. [Eaton Corporation, 108 Cherry Hill Drive, Beverly, Massachusetts 01950 (United States)] [Eaton Corporation, 108 Cherry Hill Drive, Beverly, Massachusetts 01950 (United States)

1997-11-01T23:59:59.000Z

99

Calibration of X-ray detectors in the 8 to 115 keV energy range and their application to diagnostics on the National Ignition Facility  

SciTech Connect (OSTI)

The calibration of X-ray diagnostics is of paramount importance to the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL). National Security Technologies LLC (NSTec) fills this need by providing a wide variety of calibration and diagnostic development services in support of the ongoing research efforts at NIF. The X-ray source in the High Energy X-ray lab utilizes induced fluorescence in a variety of metal foils to produce a beam of characteristic X rays ranging from 8 to 111 keV. Presented are the methods used for calibrating a High Purity Germanium detector, which has been absolutely calibrated using radioactive check sources, compared against a silicon photodiode calibrated at Physikalisch Technische Bundesanstalt (PTB). Also included is a limited presentation of results from the recent calibration of the upgraded Filter Fluorescer X ray Spectrometer.

J. J. Lee, M. J. Haugh, G. LaCaille, and P. Torres

2012-10-01T23:59:59.000Z

100

First result of the experimental search for the 9.4 keV solar axion reactions with Kr-83 in the copper proportional counter  

E-Print Network [OSTI]

The experimental search for solar hadronic axions is started at the Baksan Neutrino Observatory of the Institute for Nuclear Researches Russian Academy of Science. It is assumed that axions are created in the Sun during M1-transition between the first thermally excited level at 9.4 keV and the ground state in Kr-83. The experiment is based on axion detection via resonant absorption process by the same nucleus in the detector. The big copper proportional counter filled with krypton is used to detect signals from axions. The experimental setup is situated in the deep underground low background laboratory. No evidence of axion detection were found after the 26.5 days data collection. Resulting new upper limit on axion mass is m_{A} < 130 eV at 95% C.L.

Yu. M. Gavrilyuk; A. M. Gangapshev; A. V. Derbin; V. V. Kazalov; H. J. Kim; Y. D. Kim; V. V. Kobychev; V. V. Kuzminov; Luqman Ali; V. N. Muratova; S. I. Panasenko; S. S. Ratkevich; D. A. Semenov; D. A. Tekueva; S. P. Yakimenko; E. V. Unzhakov

2014-05-06T23:59:59.000Z

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101

Note: On the generation of sub-300 keV flash-X-rays using rod-pinch diode: An experimental investigation  

SciTech Connect (OSTI)

Generation of flash X-rays (FXRs) at less than 500 keV is described with emphasis on experimental investigation. The pulser is a Tesla transformer-Water transmission line based pulsed power generator operating in double resonance mode to power a rod-pinch diode. The configuration of aspect ratio reported here falls much below the normally reported ratios for the rod-pinch diode operation. Experimental investigation at such low pulsed voltage has revealed “flowering” of the anode tip and “pitting” of the perspex window. A possible explanation in terms of Lorentz body force is discussed rather than the pinch mechanism generally suggested in literature. The experimental investigation for the FXR generation is corroborated by measuring the radiation dose using CaSO{sub 4} (Dy) thermo luminescent dosimeters.

Satyanarayana, N.; Rajawat, R. K.; Basu, Shibaji [Facility for Electromagnetic Systems, BARCF(V), B-Block, Autonagar, Visakhapatnam 530012, Andhra Pradesh (India); Rao, A. Durga Prasad [Department of Nuclear Physics, Andhra University, Visakhapatnam 530001, Andhra Pradesh (India); Mittal, K. C. [Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, Maharashtra (India)

2014-09-15T23:59:59.000Z

102

ASCA Discovery of Diffuse 6.4 keV Emission Near the Sgr C Complex: A New X-ray Reflection Nebula  

E-Print Network [OSTI]

We present an ASCA discovery of diffuse hard X-ray emission from the Sgr C complex with its peak in the vicinity of the molecular cloud core. The X-ray spectrum is characterized by a strong 6.4-keV line and large absorption. These properties suggest that Sgr C is a new X-ray reflection nebula which emits fluorescent and scattered X-rays via irradiation from an external X-ray source. We found no adequately bright source in the immediate Sgr C vicinity to fully account for the fluorescence. The irradiating source may be the Galactic nucleus Sgr A*, which was brighter in the past than it is now as is suggested from observations of the first X-ray reflection nebula Sgr B2.

H. Murakami; K. Koyama; M. Tsujimoto; Y. Maeda; M. Sakano

2000-12-14T23:59:59.000Z

103

Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line  

E-Print Network [OSTI]

Hidden axions may be coupled to the standard model particles through a kinetic or mass mixing with QCD axion. We study a scenario in which a hidden axion constitutes a part of or the whole of dark matter and decays into photons through the mixing, explaining the 3.5 keV X-ray line signal. Interestingly, the required long lifetime of the hidden axion dark matter can be realized for the QCD axion decay constant at an intermediate scale, if the mixing is sufficiently small. In such a two component dark matter scenario, the primordial density perturbations of the hidden axion can be highly non-Gaussian, leading to a possible dispersion in the X-ray line strength from various galaxy clusters and near-by galaxies. We also discuss how the parallel and orthogonal alignment of two axions affects their couplings to gauge fields.

Tetsutaro Higaki; Naoya Kitajima; Fuminobu Takahashi

2014-08-18T23:59:59.000Z

104

3-10 keV and 0. 1- to 2-MeV observations of four gamma-ray bursts  

SciTech Connect (OSTI)

Four catalogued ..gamma..-ray bursts that occurred between 79/3/7 and 79/7/31 have been observed over the 3 to 10 keV range by a joint NRL/Los Alamos experiment on the Air Force P78-1 satellite. The bursts were also well observed by members of the interplanetary network. In this paper we present hardness ratios, x-ray/..gamma..-ray luminosity ratios, and time histories. The most significant results presented herein can be summarized as follows: (1) gamma-ray bursters can emit fairly strongly at x-ray energies near the time of the ..gamma.. burst with L/sub x//L/sub ..gamma../ approx. .02 (L/sub x/ approx. 10/sup 37/ ergs s/sup -1/, 3 to 10 keV, assuming a distance of 1 kpc); (2) the centroid of the x-ray emission generally lags the ..gamma..-ray centroid, but there is also evidence for one or more types of x-ray precursor activity; (3) the ..gamma..-ray hardness ratios were not highly variable for these particular events. However, there is some evidence that the ..gamma..-ray spectra softened near the ends of the bursts when the x-ray/..gamma..-ray ratios were high; (4) the x-ray/..gamma..-ray power law number index during times of the strongest ..gamma..-ray emission ranged from 0.8 to approx. 1.1 for the four bursts; (5) the x-ray tail of GB790307 probably can be modeled as the cooling of hot plasma generated during the ..gamma..-ray burst. Simple versions of this model can be used to estimate various source parameters. These estimates imply a distance of a few hundred to a few thousand pc; (6) gamma-ray bursters probably do not produce events similar to classical x-ray bursts independently of the ..gamma..-ray emission.

Laros, J.G.; Evans, W.D.; Fenimore, E.E.; Klebesadel, R.W.; Shulman, S.; Fritz, G.

1983-01-01T23:59:59.000Z

105

The 3.5 keV X-ray line signature from annihilating and decaying dark matter in Weinberg model  

E-Print Network [OSTI]

Recently two groups independently observed unidentified X-ray line signal at the energy 3.55 keV from the galaxy clusters and Andromeda galaxy. We show that this anomalous signal can be explained in annihilating dark matter model, for example, fermionic dark matter model in hidden sector with global $U(1)_X$ symmetry proposed by Weinberg. There are two scenarios for the production of the annihilating dark matters. In the first scenario the dark matters with mass 3.55 keV decouple from the interaction with Goldstone bosons and go out of thermal equilibrium at high temperature ($>$ 1 TeV) when they are still relativistic, their number density per comoving volume being essentially fixed to be the current value. The correct relic abundance of this warm dark matter is obtained by assuming that about ${\\cal O}(10^3)$ relativistic degrees of freedom were present at the decoupling temperature or alternatively large entropy production occurred at high temperature. In the other scenario, the dark matters were absent at high temperature, and as the universe cools down, the SM particles annihilate or decay to produce the dark matters non-thermally as in `freeze-in' scenario. It turns out that the DM production from Higgs decay is the dominant one. In the model we considered, only the first scenario can explain both X-ray signal and relic abundance. The X-ray signal arises through $p$-wave annihilation of dark matter pair into two photons through the scalar resonance without violating the constraints from big bang nucleosynthesis, cosmic microwave background, and astrophysical objects such as red giants or white dwarfs. We also discuss the possibility that the signal may result from a decaying dark matter in a simple extension of Weinberg model.

Seungwon Baek; P. Ko; Wan-Il Park

2014-05-28T23:59:59.000Z

106

Atom penetration from a thin film into the substrate during sputtering by polyenergetic Ar{sup +} ion beam with mean energy of 9.4 keV  

SciTech Connect (OSTI)

Penetration of alien atoms (Be, Ni) into Be, Al, Zr, Si and diamond was investigated under Ar{sup +} ion bombardment of samples having thermally evaporated films of 30--50 nm. Sputtering was carried out using a wide energy spectrum beam of Ar{sup +} ions of 9.4 keV to dose D = 1 {times} 10{sup 16}--10{sup 19} ion/cm{sup 2}. Implanted atom distribution in the targets was measured by Rutherford backscattering spectrometry (RBS) of H{sup +} and He{sup +} ions with energy of 1.6 MeV as well as secondary ion mass-spectrometry (SIMS). During the bombardment, the penetration depth of Ar atoms increases with dose linearly. This depth is more than 3--20 times deeper than the projected range of bombarding ions and recoil atoms. This is a deep action effect. The analysis shows that the experimental data for foreign atoms penetration depth are similar to the data calculated for atom migration through the interstitial site in a field of internal (lateral) compressive stresses created in the near-surface layer of the substrate as a result of implantation. Under these experimental conditions atom ratio r{sub i}/r{sub m} (r{sub i} -- radius of dopant, r{sub m} -- radius target of substrate) can play a principal determining role.

Kalin, B.A.; Gladkov, V.P.; Volkov, N.V.; Sabo, S.E. [Moscow Engineering Physics Inst. (Russian Federation)

1995-12-31T23:59:59.000Z

107

Learning to Apply Metrology Principles to the Measurement of X-ray Intensities in the 500 eV to 110 keV Energy Range  

SciTech Connect (OSTI)

National Security Technologies, LLC (NSTec), Livermore Operations, has two optical radiation calibration laboratories accredited by “the National Voluntary Laboratories Accreditation Program (NVLAP) which is the accrediting body of” the National Institute of Standards and Technology (NIST), and is now working towards accreditation for its X-ray laboratories. NSTec operates several laboratories with X-ray sources that generate X-rays in the energy range from 50 eV to 115 keV. These X-ray sources are used to characterize and calibrate diagnostics and diagnostic components used by the various national laboratories, particularly for plasma analysis on the Lawrence Livermore National Laboratory (LLNL) National Ignition Facility (NIF). Because X-ray photon flux measurement methods that can be accredited, i.e., traceable to NIST, have not been developed for sources operating in these energy ranges, NSTec, NIST, and the National Voluntary Accreditation Program (NVLAP) together have defined a path toward the development and validation of accredited metrology methods for X-ray energies. The methodology developed for the high energy X-ray (HEX) Laboratory was NSTec’s starting point for X-ray metrology accreditation and will be the basis for the accredited processes in the other X-ray laboratories. This paper will serve as a teaching tool, by way of this example using the NSTec X-ray sources, for the process and methods used in developing an accredited traceable metrology.

Haugh, M. J.; Pond, T.; Silbernagel, C.; Torres, P.; Marlett, K.; Goldin, F.; Cyr, S.

2011-02-08T23:59:59.000Z

108

A new study of the $^{22}$Ne(p,$?$)$^{23}$Na reaction deep underground: Feasibility, setup, and first observation of the 186 keV resonance  

E-Print Network [OSTI]

The $^{22}$Ne(p,$\\gamma$)$^{23}$Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contributes to the nucleosythesis of neon and sodium isotopes. In order to reduce the uncertainties in the predicted nucleosynthesis yields, new experimental efforts to measure the $^{22}$Ne(p,$\\gamma$)$^{23}$Na cross section directly at the astrophysically relevant energies are needed. In the present work, a feasibility study for a $^{22}$Ne(p,$\\gamma$)$^{23}$Na experiment at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400\\,kV accelerator deep underground in the Gran Sasso laboratory, Italy, is reported. The ion beam induced $\\gamma$-ray background has been studied. The feasibility study led to the first observation of the $E_{\\rm p}$ = 186\\,keV resonance in a direct experiment. An experimental lower limit of 0.12\\,$\\times$\\,10$^{-6}$\\,eV has been obtained for the resonance strength. Informed by the feasibility study, a dedicated experimental setup for the $^{22}$Ne(p,$\\gamma$)$^{23}$Na experiment has been developed. The new setup has been characterized by a study of the temperature and pressure profiles. The beam heating effect that reduces the effective neon gas density due to the heating by the incident proton beam has been studied using the resonance scan technique, and the size of this effect has been determined for a neon gas target.

F. Cavanna; R. Depalo; M. -L. Menzel; M. Aliotta; M. Anders; D. Bemmerer; C. Broggini; C. G. Bruno; A. Caciolli; P. Corvisiero; T. Davinson; A. di Leva; Z. Elekes; F. Ferraro; A. Formicola; Zs. Fülöp; G. Gervino; A. Guglielmetti; C. Gustavino; Gy. Gyürky; G. Imbriani; M. Junker; R. Menegazzo; P. Prati; C. Rossi Alvarez; D. A. Scott; E. Somorjai; O. Straniero; F. Strieder; T. Szücs; D. Trezzi

2014-11-25T23:59:59.000Z

109

First observation of {alpha} decay of {sup 190}Pt to the first excited level (E{sub exc}=137.2 keV) of {sup 186}Os  

SciTech Connect (OSTI)

The {alpha} decays of naturally occurring platinum isotopes, which are accompanied by the emission of {gamma} quanta, have been searched for deep underground (3600 m water equivalent) at the Gran Sasso National Laboratories of the INFN (Italy). A sample of Pt with a mass of 42.5 g and a natural isotopic composition has been measured with a low background HP Ge detector (468 cm{sup 3}) during 1815 h. The {alpha} decay of {sup 190}Pt to the first excited level of {sup 186}Os (J{sup {pi}}=2{sup +}, E{sub exc}=137.2 keV) has been observed for the first time, with the half-life determined as T{sub 1/2}=2.6{sub -0.3}{sup +0.4}(stat.){+-}0.6(syst.)x10{sup 14} yr. The T{sub 1/2} limits for the {alpha} decays of other Pt isotopes have been determined at the level of T{sub 1/2}{approx_equal}10{sup 16}-10{sup 20} yr. These limits have been set for the first time or they are better than those known from earlier experiments.

Belli, P. [INFN, Sezione di Roma Tor Vergata, I-00133 Rome (Italy); Bernabei, R. [INFN, Sezione di Roma Tor Vergata, I-00133 Rome (Italy); Dipartimento di Fisica, Universita di Roma Tor Vergata, I-00133 Rome (Italy); Cappella, F. [INFN, Sezione di Roma La Sapienza, I-00185 Rome (Italy); Dipartimento di Fisica, Universita di Roma La Sapienza, I-00185 Rome (Italy); Cerulli, R.; Laubenstein, M.; Nisi, S. [INFN, Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ) (Italy); Danevich, F. A.; Nagorny, S. S.; Polischuk, O. G.; Tretyak, V. I. [Institute for Nuclear Research, MSP 03680 Kyiv (Ukraine); Incicchitti, A. [INFN, Sezione di Roma La Sapienza, I-00185 Rome (Italy)

2011-03-15T23:59:59.000Z

110

Nonthermal Two Component Dark Matter Model for Fermi-LAT $\\gamma$-ray excess and 3.55 keV X-ray Line  

E-Print Network [OSTI]

A two component model of nonthermal dark matter is formulated to simultaneously explain the Fermi-LAT results indicating a $\\gamma$-ray excess observed from our Galactic Centre in the 1-3 GeV energy range and the detection of an X-ray line at 3.55 keV from extra galactic sources. Two additional Standard Model singlet scalar fields $S_2$ and $S_3$ are introduced. These fields couple among themselves and with the Standard Model Higgs doublet $H$. The interaction terms among the scalar fields, namely $H$, $S_2$ and $S_3$, are constrained by the application of a discrete $\\mathbb{Z}_2\\times \\mathbb{Z}^\\prime_2$ symmetry which breaks softly to a remnant $\\mathbb{Z}^{\\prime \\prime}_2$ symmetry. This residual discrete symmetry is then spontaneously broken through an MeV order vacuum expectation value $u$ of the singlet scalar field $S_3$. The resultant physical scalar spectrum has the Standard Model like Higgs as $\\chi_{{}_{{}_1}}$ with $M_{\\chi_{{}_{{}_1}}}\\sim 125$ GeV, a moderately heavy scalar $\\chi_{{}_{{}_2}}$...

Biswas, Anirban; Roy, Probir

2015-01-01T23:59:59.000Z

111

Developing a Compton Polarimeter to Measure Polarization of Hard X-Rays in the 50-300 keV Energy Range  

E-Print Network [OSTI]

This paper discusses the latest progress in the development of GRAPE (Gamma-Ray Polarimeter Experiment), a hard X-ray Compton Polarimeter. The purpose of GRAPE is to measure the polarization of hard X-rays in the 50-300 keV energy range. We are particularly interested in X-rays that are emitted from solar flares and gamma-ray bursts (GRBs). Accurately measuring the polarization of the emitted radiation from these sources will lead, to a better understating of both the emission mechanisms and source geometries. The GRAPE design consists of an array of plastic scintillators surrounding a central high-Z crystal scintillator. We can monitor individual Compton scatters that occur in the plastics and determine whether the photon is photo absorbed by the high-Z crystal or not. A Compton scattered photon that is immediately photo absorbed by the high-Z crystal constitutes a valid event. These valid events provide us with the interaction locations of each incident photon and ultimately produces a modulation pattern for the Compton scattering of the polarized radiation. Comparing with Monte Carlo simulations of a 100% polarized beam, the level of polarization of the measured beam can then be determined. The complete array is mounted on a flat-panel multi-anode photomultiplier tube (MAPMT) that can measure the deposited energies resulting from the photon interactions. The design of the detector allows for a large field-of-view (>pi steradian), at the same time offering the ability to be close-packed with multiple modules in order to reduce deadspace. We plan to present in this paper the latest laboratory results obtained from GRAPE using partially polarized radiation sources.

J. S. Legere; P. Bloser; J. R. Macri; M. L. McConnell; T. Narita; J. M. Ryan

2005-08-14T23:59:59.000Z

112

Physics design of a 100 keV acceleration grid system for the diagnostic neutral beam for international tokamak experimental reactor  

SciTech Connect (OSTI)

This paper describes the physics design of a 100 keV, 60 A H{sup -} accelerator for the diagnostic neutral beam (DNB) for international tokamak experimental reactor (ITER). The accelerator is a three grid system comprising of 1280 apertures, grouped in 16 groups with 80 apertures per beam group. Several computer codes have been used to optimize the design which follows the same philosophy as the ITER Design Description Document (DDD) 5.3 and the 1 MeV heating and current drive beam line [R. Hemsworth, H. Decamps, J. Graceffa, B. Schunke, M. Tanaka, M. Dremel, A. Tanga, H. P. L. De Esch, F. Geli, J. Milnes, T. Inoue, D. Marcuzzi, P. Sonato, and P. Zaccaria, Nucl. Fusion 49, 045006 (2009)]. The aperture shapes, intergrid distances, and the extractor voltage have been optimized to minimize the beamlet divergence. To suppress the acceleration of coextracted electrons, permanent magnets have been incorporated in the extraction grid, downstream of the cooling water channels. The electron power loads on the extractor and the grounded grids have been calculated assuming 1 coextracted electron per ion. The beamlet divergence is calculated to be 4 mrad. At present the design for the filter field of the RF based ion sources for ITER is not fixed, therefore a few configurations of the same have been considered. Their effect on the transmission of the electrons and beams through the accelerator has been studied. The OPERA-3D code has been used to estimate the aperture offset steering constant of the grounded grid and the extraction grid, the space charge interaction between the beamlets and the kerb design required to compensate for this interaction. All beamlets in the DNB must be focused to a single point in the duct, 20.665 m from the grounded grid, and the required geometrical aimings and aperture offsets have been calculated.

Singh, M. J. [ITER-India, Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India); De Esch, H. P. L. [CEA-Cadarache, IRFM, F-13108 Saint-Paul-lez-Durance (France)

2010-01-15T23:59:59.000Z

113

SPUTTERING AND MOLECULAR SYNTHESIS INDUCED BY 100 keV PROTONS IN CONDENSED CO{sub 2} AND RELEVANCE TO THE OUTER SOLAR SYSTEM  

SciTech Connect (OSTI)

We present results on sputtering and radiation chemistry of CO{sub 2} films induced by 100 keV H{sup +} at 25 and 50 K. Using a quartz crystal microbalance, we measure a sputtering yield (SY) between {approx}10 and 20 CO{sub 2} equivalent per ion at 25 K. The yield at 50 K is similar to that at 25 K at low fluences, but increases to {approx}2400 by mid-10{sup 14} H{sup +} cm{sup -2} and declines at higher fluence. Irradiation to 1 Multiplication-Sign 10{sup 15} H{sup +} cm{sup -2} depletes {approx}85%-90% of the initial film mass at 50 K, compared to 3% at 25 K. In both cases, mass spectrometry shows that CO is the dominant constituent in the sputtered flux, followed by O{sub 2}, O, and CO{sub 2}. Using infrared spectroscopy, we monitor the depletion of CO{sub 2} and the accumulation of CO and O{sub 2} and minor species as O{sub 3} and CO{sub 3}. We determine G(-CO{sub 2}) = 2.6 {+-} 0.3, the number of CO{sub 2} destroyed per 100 eV at 25 K. A significant fraction of the radiolyzed CO and O{sub 2} are retained in the film at 25 K; only those near the surface are removed during irradiation, contributing to a smaller SY. At 50 K, CO and O{sub 2} are unstable along the 'hot' ion track and are expelled possibly from the entire depth of the film. Our results, and the lack of detection of CO in the exospheres around Rhea and Dione, show that the CO{sub 2} does not originate from sputtering, since otherwise the exosphere would be dominated by CO, the main molecule in the sputtered flux. We suggest that the exospheric CO{sub 2} is thermally released from an endogenic source.

Raut, U.; Baragiola, R. A. [Laboratory for Atomic and Surface Physics, University of Virginia, Thornton Hall B103, Charlottesville, VA 22904 (United States)

2013-07-20T23:59:59.000Z

114

IonCCD™ for direct position-sensitive charged-particle detection: from electrons and keV ions to hyperthermal biomolecular ions  

SciTech Connect (OSTI)

A novel charged-particle sensitive, pixel based detector array is described and its usage is demonstrated for a variety of applications, from detection of elemental particles (electrons) to hyper-thermal large biomolecular positive and negative ions including keV light atomic and molecular ions. The array detector is a modified light-sensitive charged coupled device (CCD). The IonCCDTM was engineered for direct charged particle detection by replacing the semi-conductor part of the CCD pixel by a conductor1. In contrast with the CCD, where the semi-conductive pixel is responsible for electron-hole pair formation upon photon bombardment, the IonCCD uses a capacitor coupled to the conductive electrode for direct charge integration. The detector can be operated from atmospheric pressure to high vacuum since no high voltages are needed. The IonCCD, presented in this work is an array of 2126 active pixels with 21 um pixel width and 3 um pixel gap. The detection area is 1.5x51mm2 where 1.5 mm and 51 mm are pixel and detector array length, respectively. The result is a one-dimensional position-sensitive detector with 24 um spatial resolution and 88 % pixel area ratio (PAR). In this work we demonstrate the capabilities and the performance of the detector. For the first time we show the direct detection of 250 eV electrons providing linearity response and detection efficiency of the IonCCD as function of electron beam current. Using positive ions from and electron impact source (E-I), we demonstrate that the detection efficiency of the IonCCD is virtually independent of particle energy [250 eV, 1250 eV], particle impact angle [45o, 90o] and particle flux. By combining the IonCCD with a double focusing sector field of Mattauch-Herzog geometry (M-H), we demonstrate fast acquisition of mass spectra in direct air sniffing mode. A first step towards fast in vivo breath analysis is presented. Detection of hyper-thermal biomolecular ions produced using an electrospray ionization source (ESI) is presented. The IonCCD was used as beam profiler to characterize the beam shape and intensity of 15 eV protonated and deprotonated biomolecular ions at the exit of an RF only collisional quadrupole. We present simultaneous detection of 140 eV doubly protonated biomolecular ions when the IonCCD is combined with the M-H analyzer. The latter, demonstrates the possibility of simultaneous separation and micro-array deposition of biological material using a miniature sector field.

Hadjar, Omar; Johnson, Grant E.; Laskin, Julia; Kibelka, Gottfried; Shill, Scott M.; Kuhn, Ken; Cameron, Chad; Kassan, Scott

2011-04-01T23:59:59.000Z

115

[New OPinitial posting 5/16/11] Operating Policy and Procedure  

E-Print Network [OSTI]

an enterprise-wide web publication policy for Texas Tech University websites. REVIEW: This OP will be reviewed--The primary page or entry point of a website b. Primary public entry point--A Web page designed specifically public entry point for the university. c. Secondary public entry point--Any supplementary Web page

Rock, Chris

116

Measurement of the 238U neutron-capture cross section and gamma-emission spectra from 10 eV to 100 keV using the DANCE detector at LANSCE  

SciTech Connect (OSTI)

A careful new measurement of the {sup 238}U(n,{gamma}) cross section from 10 eV to 100 keV has been made using the DANCE detector at LANSCE. DANCE is a 4{pi} calorimetric scintillator array consisting of 160 BaF{sub 2} crystals. Measurements were made on a 48 mg/cm{sup 2} depleted uranium target. The cross sections are in general good agreement with previous measurements. The gamma-ray emission spectra, as a function of gamma multiplicity, were also measured and compared to model calculations.

Ullmann, John L [Los Alamos National Laboratory; Couture, A J [Los Alamos National Laboratory; Keksis, A L [Los Alamos National Laboratory; Vieira, D J [Los Alamos National Laboratory; O' Donnell, J M [Los Alamos National Laboratory; Jandel, M [Los Alamos National Laboratory; Haight, R C [Los Alamos National Laboratory; Rundberg, R S [Los Alamos National Laboratory; Kawano, T [Los Alamos National Laboratory; Chyzh, A [NORTH CAROLINA STATE UNIV; Baramsai, B [NORTH CAROLINA STATE UNIV; Wu, C Y [LLNL; Mitchell, G E [NORTH CAROLINA STATE UNIV; Becker, J A [LLNL; Krticka, M [CHARLES UNIV

2010-01-01T23:59:59.000Z

117

Technical Note: Influence of the phantom material on the absorbed-dose energy dependence of the EBT3 radiochromic film for photons in the energy range 3 keV–18 MeV  

SciTech Connect (OSTI)

Purpose: Water is the reference medium for radiation therapy dosimetry, but for film dosimetry it is more practical to use a solid phantom. As the composition of solid phantoms differs from that of water, the energy dependence of film exposed within solid phantoms may also differ. The energy dependence of a radiochromic film for a given beam quality Q (energy for monoenergetic beams) has two components: the intrinsic energy dependence and the absorbed-dose energy dependence f(Q), the latter of which can be calculated through a Monte Carlo simulation of radiation transport. The authors used Monte Carlo simulations to study the influence of the phantom material on the f(Q) of the EBT3 radiochromic film (Ashland Specialty Ingredients, Wayne, NJ) for photon beams with energies between 3 keV and 18 MeV. Methods: All simulations were carried out with the general-purpose Monte Carlo code PENELOPE 2011. The geometrical model consisted of a cylindrical phantom, with the film positioned at different depths depending on the initial photon energy. The authors simulated monoenergetic parallel photon beams and x-ray beams from a superficial therapy system. To validate their choice of simulation parameters, they also calculated f(Q) for older film models, EBT and EBT2, comparing with published results. In addition to water, they calculated f(Q) of the EBT3 film for solid phantom materials commonly used for film dosimetry: RW1 and RW3 (PTW-Freiburg, Freiburg, Germany), Solid Water (Gammex-RMI, Madison, WI), and PMMA. Finally, they combined their calculated f(Q) with published overall energy response data to obtain the intrinsic energy dependence of the EBT3 film in water. Results: The calculated f(Q) for EBT and EBT2 films was statistically compatible with previously published data. Between 10 keV and 18 MeV, the variation found in f(Q) of the EBT3 film for water was within 2.3%, with a standard statistical uncertainty less than 1%. If the quantity dose-to-water in the phantom is considered, which is the common practice in radiation dosimetry, the maximum difference of energy dependence for the solid phantoms with respect to water is about 6%, at an energy of 50 keV. Conclusions: The EBT3 film shows a reasonably constant absorbed-dose energy dependence when irradiated in water. If the dose-to-water in the phantom is considered, the maximum difference of EBT3 film energy dependence with the solid phantoms studied with respect to water is about 6% (at an energy of 50 keV). The reported overall energy dependence of the EBT3 film in water at energies below 100 keV is mainly due to the intrinsic energy dependence.

Hermida-López, M., E-mail: mhermida@vhebron.net [NCTeam, Strahlenklinik, Universitätsklinikum Essen, Hufelandstraße 55, Essen D-45122, Germany and Servei de Física i Protecció Radiològica, Hospital Universitari Vall d’Hebron, Pg. Vall d’Hebron 119-129, Barcelona 08035 (Spain); Lüdemann, L.; Flühs, A. [Medical Physics, Strahlenklinik, Universitätsklinikum Essen, Hufelandstraße 55, Essen D-45122 (Germany); Brualla, L. [NCTeam, Strahlenklinik, Universitätsklinikum Essen, Hufelandstraße 55, Essen D-45122 (Germany)

2014-11-01T23:59:59.000Z

118

Shape coexistence near the N=38 shell gap: Magnetic moment of the 981.6 keV J{sup {pi}=}8{sup +} level in {sup 72}As  

SciTech Connect (OSTI)

We report on the first determination of the magnetic moment of the 981.1 keV, J{sup {pi}=}8{sup +} level in {sup 72}As, a nucleus that belongs to the A{approx_equal}70 mass region dominated by rapidly changing deformations and shapes. The 8{sup +} level is the bandhead of a collective sequence of positive parity levels coexisting with low-spin and medium-spin spherical shell-model states. The magnetic moment was measured by the time-integral perturbed angular distributions method to be {mu}=-(4.272{+-}0.280){mu}{sub N}. This value is in disagreement with the presumed [{pi}(1g{sub 9/2}),{nu}(1g{sub 9/2})] configuration and points to a more complex configuration involving two neutrons in the 1g{sub 9/2} orbital.

Pantelica, D.; Scintee, N.; Ionescu, P.; Velisa, G.; Negoita, F. [National Institute for Physics and Nuclear Engineering, R-077125, Bucharest-Magurele (Romania); Drafta, G. [National Institute for Physics and Nuclear Engineering, R-077125, Bucharest-Magurele (Romania); Physics Department, University Politechnica of Bucharest, R-060042, Bucharest (Romania)

2010-10-15T23:59:59.000Z

119

The Millennium Gas project aims to undertake smoothed-particle hydrodynamic resimulations of the Millennium Simulation, providing many hundred massive galaxy clusters for comparison with X-ray surveys (170 clusters with kTsl > 3 keV). This paper looks at  

E-Print Network [OSTI]

. Abstract The Millennium Gas project aims to undertake smoothed-particle hydrodynamic-ray surveys (170 clusters with kTsl > 3 keV). This paper looks at the hot gas and stellar fractions-core systems but are successful in matching the hot gas profiles of non-cool-core clusters. Although

Thomas, Peter

120

: 2009 5 15 () 19:00 -21:30 () 5 16 () 09:00 -17:00 ()  

E-Print Network [OSTI]

:00 Room 201 #12; 1 , 2 , 1 1 2 LG electronics : (02)2123-7709, E-mail: circuit-Young Choi 1 1 Department of Electrical and Electronic Engineering. Yonsei University,2 LG electronics2.1 350uW 3.2GHz , , , () () A2.2 CMOS VCO Prescaler , , () A2.3 , () (LG) A2

Choi, Woo-Young

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121

SustSciTeam_ProgramSummary_051611.xlsx.5/16/11 1Q 2Q 3Q Summer  

E-Print Network [OSTI]

-month) Orientation and Team Building Year 1 Sustainability Science ESS280A (4units) Independent Research XXX299 (4 units) Independent Research XXX299 (4 units) Summer Salary Sustainability Science Course; Define Team Report; Progress mtgs. Sustainability Science Team - Summary Schedule Apply to Sustainability Science

Rose, Michael R.

122

als double-crystal monochromator: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

newest additions to Sony's Bsec. for compatibility with slower vision systems using Sony XC-55 cameras. The XC-HR50 and XC-HR70 cameras incorporate Demoulin, Pascal 20 Stress...

123

E-Print Network 3.0 - artificial channel-cut monochromator Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Physics 20 INFLUENCE OF QUANTUM-DOTS DENSITY ON AVERAGE IN-PLANE STRAIN OF OPTOELECTRONIC DEVICES Summary: detector channel-cut Ge220 analyser sample X-ray tube point focus...

124

E-Print Network 3.0 - acceptance crystal monochromator Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

... Source: Controlled Fusion Atomic Data Center (CFADC) Collection: Plasma Physics and Fusion 13 MACS -A New High Intensity Cold Neutron Spectrometer at NIST Summary: V (Ei2.1...

125

Thermal and mechanical joints to cryo-cooled silicon monochromator crystals  

E-Print Network [OSTI]

resistance of the joint. The operating temperature of –150 ooperating temperature range was as small as possible in an attempt to reduce the strain in the joint and

MacDowell, A.; Fakra, S.; Morrison, G.

2006-01-01T23:59:59.000Z

126

Periodic magnetic fieldas a polarized and focusing thermal neutron spectrometer and monochromator  

E-Print Network [OSTI]

B828?. The aluminum spacers had dimensions 12.7 ? 2.54? 12.7magnet pole dimension ?axial width? Aluminum spacer width

2010-01-01T23:59:59.000Z

127

ANL/APS/TB-24 Diamond Monochromators for APS Undulator-A Beamlines  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations2 Print258Department of31 . Wiggler9 A4

128

DEVELOPMENT OF 120 keV NEUTRAL BEAM INJECTORS  

E-Print Network [OSTI]

heat load and the heat capacity of the grids determine thepulse. To measure the heat load to the grids we fabricated •lines; the average heat load to each grid could thus be

Berkner, K.H.

2010-01-01T23:59:59.000Z

129

Secondary ion emission under keV carbon cluster bombardment  

E-Print Network [OSTI]

such that higher energies produce more multiple ion emission. The emission of CN- from biological samples as a function of carbon-based projectile characteristics was examined to explore the possibility of using CN- as a molecular identifier. CN- emission was found...

Locklear, Jay Edward

2006-10-30T23:59:59.000Z

130

Power In Space: Time For A Biological Solution http://www.spacedaily.com/reports/Power_In_Space_Time_For_A_Bi... 1 of 4 5/16/2007 10:16 AM  

E-Print Network [OSTI]

on the hardest of hardware: photovoltaics (solar panels), hydrogen fuel cells, radioisotope thermal generators, microbial fuel cells, and algal growing compartments are all visible. Image by Chris Lund. Credit: Int are microbial fuel cells, which rely on microbes that release electrons during metabolism, and gadgets

Lovley, Derek

131

Heliospheric Energetic Particle Reservoirs: Ulysses and ACE 175-315 keV Electron Observations  

E-Print Network [OSTI]

there is also the additional and dominant contribution from the radioisotope thermoelectric generator (RTG

Sanahuja, Blai

132

Phenomenological description of neutron capture cross sections at 30 keV  

E-Print Network [OSTI]

Studying published data of Maxwellian averaged neutron capture cross sections, we found simple phenomenological rules obeyed by the cross sections as a function of proton and neutron number. We use these rules to make predictions for cross sections of neutron capture on nuclei with proton number above 83, where very few data are available.

Miklos Kiss; Zoltan Trocsanyi

2011-04-01T23:59:59.000Z

133

Compton-profile measurements for W, Ag, and Cu with 662-keV. gamma. rays  

SciTech Connect (OSTI)

The Compton profiles of W, Ag, and Cu were measured for three scattering angles (30/sup 0/, 15/sup 0/, and 10/sup 0/) using /sup 137/Cs ..gamma.. rays. A Monte Carlo simulation was used to reproduce the experimental situation. Double-scattering events are considered in the simulation and subtracted from the single profile when necessary. Good accordance with the theoretical momentum distribution of the electron cloud was observed when relativistic wave functions quoted by Mendelsohn, Biggs, and Mann are used. This accordance was achieved only when the Ribberfors correction of the Compton profile was considered.

Heller, M.V.; Moreira, J.R.

1986-04-01T23:59:59.000Z

134

Supernova explosions, 511 keV photons, gamma ray bursts and mirror matter  

E-Print Network [OSTI]

There are three astroparticle physics puzzles which fire the imagination: the origin of the ``Great Positron Producer'' in the galactic bulge, the nature of the gamma-ray bursts central engine and the mechanism of supernova explosions. We show that the mirror matter model has the potential to solve all three of these puzzles in one beautifully simple strike.

R. Foot; Z. K. Silagadze

2004-04-27T23:59:59.000Z

135

New generation of efficient high resolution detector for 30-100 keV  

E-Print Network [OSTI]

and by the numerical aperture of the optical connection between scintillator and photo detector. This establishes the coating process is low. The radiation hardness of the scintillator has been measured. Doses of more than shows severe structural damage. ISBN 978-87-550-3714-4 Supervisors: Henning Friis Poulsen (Risø

136

E-Print Network 3.0 - attosecond kev x-ray Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

de Montral Collection: Engineering 3 Generation of Attosecond X-ray and gamma-ray via Compton backscattering Summary: Generation of Attosecond X-ray and gamma-ray via...

137

A Beam line for Macromolecular Crystallography in ALBA  

SciTech Connect (OSTI)

ALBA is a third generation 3 GeV storage ring being built near Barcelona and foreseen to be operational in 2010. Out of the seven beamlines already funded in ALBA, one will be dedicated to macromolecular crystallography (MX). The beamline, dubbed XALOC, shall cope with a broad range of crystal structures and sizes. To this aim, a flexible optical design involving variable focusing optics has been incorporated into the beamline optics. The photon source will be a 2 m long, in-vacuum undulator with a period of 21.3 mm. The optics will consist in a Si(111), double-crystal monochromator cryogenically cooled, and a pair of mirrors placed in a Kirkpatrick-Baez configuration. The beamline will deliver a high flux beam in the 5-15 keV energy range, with an energy resolution of {delta}E/E {approx}2 x 10-4. In addition to the main beamline, it is being considered the possibility to use a diamond laue monochromator to provide photons at a fixed wavelength to an ancillary branch. This report shows the present status of the beamline design.

Juanhuix, Jordi; Ferrer, Salvador [CELLS -ALBA Synchrotron, Ed. Ciencies, Campus UAB, 08193 Bellaterra, Barcelona (Spain)

2007-01-19T23:59:59.000Z

138

Gamma ray optics  

SciTech Connect (OSTI)

Via refractive or diffractive scattering one can shape {gamma} ray beams in terms of beam divergence, spot size and monochromaticity. These concepts might be particular important in combination with future highly brilliant gamma ray sources and might push the sensibility of planned experiments by several orders of magnitude. We will demonstrate the experimental feasibility of gamma ray monochromatization on a ppm level and the creation of a gamma ray beam with nanoradian divergence. The results are obtained using the inpile target position of the High Flux Reactor of the ILL Grenoble and the crystal spectrometer GAMS. Since the refractive index is believed to vanish to zero with 1/E{sup 2}, the concept of refractive optics has never been considered for gamma rays. The combination of refractive optics with monochromator crystals is proposed to be a promising design. Using the crystal spectrometer GAMS, we have measured for the first time the refractive index at energies in the energy range of 180 - 2000 keV. The results indicate a deviation from simple 1/E{sup 2} extrapolation of X-ray results towards higher energies. A first interpretation of these new results will be presented. We will discuss the consequences of these results on the construction of refractive optics such as lenses or refracting prisms for gamma rays and their combination with single crystal monochromators.

Jentschel, M.; Guenther, M. M.; Habs, D.; Thirolf, P. G. [Institut Laue-Langevin, F38042 Grenoble (France); Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany); Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Germany and Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany); Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany)

2012-07-09T23:59:59.000Z

139

Two Phase Dynamics as the Origin to: 0.25 keV and 0.1 keV X-ray Diffuse Backgrounds, CMB, Global Quantized Redshift, 10 Mpc Space distributions and 30 Myr Cycles at Earth Phenomena  

E-Print Network [OSTI]

An Alternative to explain the origin of matter-background connections from the paper "Do Cosmic Backgrounds Cyclical Renew by Matter and Quanta Emissions?..." proposed: A sequence of discontinuous small changes of light speed in time as the cause, which provoke that criticality processes take place every 26-30 million years. Then, matter particles and quanta reach at one threshold value, and are compelled to reorganize their internal energy and make emissions that later becomes in current cosmic backgrounds. The small discontinues relative decreasing of c of about 10 -5) should do some small effects on planet and living bodies. Cyclic small reorganization of matter particles is consider as the astrophysical origin of Earth cyclic catastrophes. And at space global distribution: quantized redshift, change of galaxy fractal distribution at 10 Mpc scale, galaxy average luminosity and the luminosity fluctuation of galaxy pairs are enhanced out to separations near 10 Mpc. Also proposed: Like the Universe is observed flat in distance and time, the gravitational constant G might decrease with time, which may originate the Earth orbit eccentricity cycle of 100000 yr and, provoke the former mentioned sequence of c decrease in time. And, every 6 million years, the accumulation of G relative decrease of about 10-5 in G compelled space-time to reach at one threshold value that, trigger small relative decrease of light speed c of about 10-5 cyclically. This is interpreted as the Universe has two dynamical phases following one each other cyclically with intervals of 26-30 million years respectively: One of about 0.1 million years, called "activation phase", at which the critical processes take place, follows by longer "inhibition phase". The present approach indicates the existence of a subtle non linear dynamics, which could also contribute to the origin of galaxy fractal distribution.

Eduardo del Pozo Garcia

2015-02-25T23:59:59.000Z

140

Versatile Silicon Photodiode Detector Technology for Scanning Electron Microscopy with High-Efficiency Sub-5 keV Electron Detection  

E-Print Network [OSTI]

Versatile Silicon Photodiode Detector Technology for Scanning Electron Microscopy with High for Scanning Electron Microscopy, based on ultrashallow p+ n boron-layer photodiodes, features nm-thin anodes, closely-packed photodiodes and through-wafer apertures allow flexible configurations for optimal material

Technische Universiteit Delft

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Molecular dynamics simulation of radiation damage in CaCd6 quasicrystal cubic approximant up to 10 keV  

E-Print Network [OSTI]

, Finland 2 Department of Mathematics and Physics, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland 3 Science and Technology on Surface Physics and Chemistry Laboratory, P

Nordlund, Kai

142

Measurement of the polarization resulting from the scattering of 1250-keV gamma rays from bound electrons in lead  

E-Print Network [OSTI]

MEASUREMENT OF THE POLARIZATION RESULTING FROM THE SCATTERING OF 1250 KEY GAMMA RAYS FROM BOUND ELECTRONS IN LEAD A Thesis By Michael Clinton Hamilton Submitted to the Graduate College of the Texas AIM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1966 Major Subject: Physics MEASUREMENT OF THE POLARIZATION RESULTING FROM THE SCATTERING OF 1250"KEY GAMMA RAYS FROM BOUND ELECTRONS IN LEAD A Thesis By Michael Clinton Hamilton Approved...

Hamilton, Michael Clinton

1966-01-01T23:59:59.000Z

143

Measurements of relativistic effects in collective Thomson scattering at electron temperatures less than 1 keV  

E-Print Network [OSTI]

Thomson scattering on the NIF . . 7.1.2 Electron featureon reduced-scale targets at the nif and omega lasers,” Janparameter. . . . . . . Figure 1.2: A NIF Au hohlraum target

Ross, James Steven

2010-01-01T23:59:59.000Z

144

FHBS calculation of ionized electron angular and energy distribution following the p+H collision at 20 keV  

E-Print Network [OSTI]

the following Schr? equa- tion ( D2 1r ) c(r) = E c(r): (2.6) The solution to the 1s ground state wave function is j0 >= 2e r Y0;0: (2.7) 11 There are two solutions for a scattering state with momentum k, namely c(+)k (r) = ep=2kG(1 i=k)e ik rF(i=k;1;ikr +ik r... l0 and m0 in Eq. (2.38), thus = ?? l=0 Z ? 0 Cl rl eikr F(l +1+in;2l +2; 2ikr) il(2l +1) jl(Qr) ( 1)l 2e r p4p r2dr( 1)l (4p) 2 (2l +1)2 ?m= lY lm(Q)Ylm(k): (2.42) De ne integral Il(k;Q) = Z ? 0 rl eikr F(l +1+in...

Fu, Jun

2004-11-15T23:59:59.000Z

145

SciTech Connect: Efficient laser-induced 6 - 8 keV x-ray production from  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administrationcontroller systems controllerAdditiveBetatronAerogelDistancesCaptureiron oxide

146

Enhanced room temperature oxidation in silicon and porous silicon under 10 keV x-ray irradiation  

E-Print Network [OSTI]

is monitored by ellipsometry and interferometric reflectance spectroscopy. Fourier transform infrared FTIR samples used in this work were boron doped p-type Si 100 , 0.01­0.02 cm. Porous silicon films were solution to remove the native oxide and subse- quently rinsed with de-ionized water and dried under nitro

Weiss, Sharon

147

Production of a keV X-Ray Beam from Synchrotron Radiation in Relativistic Laser-Plasma Interaction  

E-Print Network [OSTI]

. This wake can break, trap plasma electrons, and then its large electrostatic field can accel- erate, which has been studied experimentally [11] as well as with 3D particle-in-cell (PIC) simulations [11

Umstadter, Donald

148

SciTech Connect: Efficient laser-induced 6 - 8 keV x-ray production...  

Office of Scientific and Technical Information (OSTI)

Org: USDOE Country of Publication: United States Language: English Subject: 70 PLASMA PHYSICS AND FUSION Word Cloud More Like This Full Text preview image File size NAView...

149

C-A/AP/#244 Pepper Pot Emittance Meter  

E-Print Network [OSTI]

than the ion pulse length. The monochrome video camera, Sony XCD-SX910 with IEEE 1394 digital interface

150

Beamline 10: A multipole wiggler beamline at SSRL  

SciTech Connect (OSTI)

A beamline has been constructed at Stanford Synchrotron Radiation Laboratory (SSRL) whose radiation source is a multipole permanent magnet wiggler installed in a straight section of the SPEAR 3--3.5 GeV electron storage ring. The wiggler is a hybrid design that utilizes Nd--Fe alloy magnet material combined with Vanadium Permendur poles. It is approximately 2 m long and has 15 full wiggler periods. Its field is regulated by varying its gap height. It has a peak operating field, limited by the electron beam vacuum chamber vertical aperture, of 1.4 T. The beamline consists of vacuum, safety, and optical components capable of transporting photons to one hard x-ray (3--30 keV) end station, with provisions for implementing up to two additional branch lines. The existing hard x-ray branch can be focused by a Pt-coated toroidal mirror with a cutoff energy of approximately 22 keV. The experimental end station is serviced by a Hower--Brown type double crystal monochromator. The wiggler and beamline construction was completed in the fall of 1987 and was operated for a brief period for characterization and experimental use. We present design details and results of the initial characterization studies.

Karpenko, V.; Kinney, J. H.; Kulkarni, S.; Neufeld, K.; Poppe, C.; Tirsell, K. G.; Wong, J.; Cerino, J.; Troxel, T.; Yang, J.; and others

1989-07-01T23:59:59.000Z

151

Analyzer-based phase-contrast imaging system using a micro focus x-ray source  

SciTech Connect (OSTI)

Here we describe a new in-laboratory analyzer based phase contrast-imaging (ABI) instrument using a conventional X-ray tube source (CXS) aimed at bio-medical imaging applications. Phase contrast-imaging allows visualization of soft tissue details usually obscured in conventional X-ray imaging. The ABI system design and major features are described in detail. The key advantage of the presented system, over the few existing CXS ABI systems, is that it does not require high precision components, i.e., CXS, X-ray detector, and electro-mechanical components. To overcome a main problem introduced by these components, identified as temperature stability, the system components are kept at a constant temperature inside of three enclosures, thus minimizing the electrical and mechanical thermal drifts. This is achieved by using thermoelectric (Peltier) cooling/heating modules that are easy to control precisely. For CXS we utilized a microfocus X-ray source with tungsten (W) anode material. In addition the proposed system eliminates tungsten's multiple spectral lines by selecting monochromator crystal size appropriately therefore eliminating need for the costly mismatched, two-crystal monochromator. The system imaging was fine-tuned for tungsten K?{sub 1} line with the energy of 59.3 keV since it has been shown to be of great clinical significance by a number of researchers at synchrotron facilities. In this way a laboratory system that can be used for evaluating and quantifying tissue properties, initially explored at synchrotron facilities, would be of great interest to a larger research community. To demonstrate the imaging capability of our instrument we use a chicken thigh tissue sample.

Zhou, Wei [BME Department, Illinois Institute of Technology, Chicago, Illinois 60616 (United States); Majidi, Keivan; Brankov, Jovan G., E-mail: brankov@iit.edu [ECE Department, Illinois Institute of Technology, Chicago, Illinois 60616 (United States)

2014-08-15T23:59:59.000Z

152

New limit on the mass of 9.4-keV solar axions emitted in an M1 transition in $^{83}$Kr nuclei  

E-Print Network [OSTI]

A search for resonant absorption of the solar axion by $^{83}\\rm{Kr}$ nuclei was performed using the proportional counter installed inside the low-background setup at the Baksan Neutrino Observatory. The obtained model independent upper limit on the combination of isoscalar and isovector axion-nucleon couplings $|g_3-g_0|\\leq 1.69\\times 10^{-6}$ allowed us to set the new upper limit on the hadronic axion mass of $m_{A}\\leq 130$ eV (95\\% C.L.) with the generally accepted values $S$=0.5 and $z$=0.56.

Derbin, A V; Gavrilyuk, Yu M; Kazalov, V V; Kim, H J; Kim, Y D; Kobychev, V V; Kuzminov, V V; Ali, Luqman; Muratova, V N; Panasenko, S I; Ratkevich, S S; Semenov, D A; Tekueva, D A; Yakimenko, S P; Unzhakov, E V

2015-01-01T23:59:59.000Z

153

Absence of day-night asymmetry of 862 keV Be-7 solar neutrino rate in Borexino and MSW oscillation parameters  

E-Print Network [OSTI]

We report on a search for the day-night asymmetry of the Be-7 solar neutrino rate measured by Borexino at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. The measured value, Adn=0.001 +- 0.012 (stat) +- 0.007 (syst), shows the absence of a significant asymmetry. This result alone rejects the so-called LOW solution at more than 8.5 sigma. Combined with the other solar neutrino data, it isolates the Large Mixing Angle (LMA) -- MSW solution at DeltaChi2 > 190 without relying on the assumption of CPT symmetry in the neutrino sector. We also show that including the day-night asymmetry, data from Borexino alone restricts the MSW neutrino oscillations to the LMA solution at 90% confidence level.

,

2011-01-01T23:59:59.000Z

154

Absence of day-night asymmetry of 862 keV Be-7 solar neutrino rate in Borexino and MSW oscillation parameters  

E-Print Network [OSTI]

We report on a search for the day-night asymmetry of the Be-7 solar neutrino rate measured by Borexino at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. The measured value, Adn=0.001 +- 0.012 (stat) +- 0.007 (syst), shows the absence of a significant asymmetry. This result alone rejects the so-called LOW solution at more than 8.5 sigma. Combined with the other solar neutrino data, it isolates the Large Mixing Angle (LMA) -- MSW solution at DeltaChi2 > 190 without relying on the assumption of CPT symmetry in the neutrino sector. We also show that including the day-night asymmetry, data from Borexino alone restricts the MSW neutrino oscillations to the LMA solution at 90% confidence level.

The Borexino Collaboration

2012-01-05T23:59:59.000Z

155

Cork Embedded Internal Features and Contrast Mechanisms with Del Using 18, 20, 30, 36 and 40 keV Synchrotron X-rays  

SciTech Connect (OSTI)

Images of the cork used for wine and other bottles are visualized with the use of diffraction-enhanced imaging (DEI) technique. Present experimental studies allowed us to identify the cracks, holes, porosity, and importance of soft-matter (soft-material) and associated biology by visualization of the embedded internal complex features of the biological material such as cork and its microstructure. Highlighted the contrast mechanisms above and below the K-absorption edge of iodine and studied the attenuation through a combination of weakly and strongly attenuating materials.

Rao, D.V.; Zhong, Z.; Akatsuka, T.; Yuasa, T.; Hasan, M.Z.; Takeda, T.

2010-01-01T23:59:59.000Z

156

Near-Intrinsic Energy Resolution for 30 to 662 keV Gamma Rays in a High Pressure Xenon Electroluminescent TPC  

E-Print Network [OSTI]

The search for neutrinoless double beta decay, Riv. NuovoSearch for Neutrinoless Double-Beta Decay in Xe Xe with EXO-

Català, J.M.

2014-01-01T23:59:59.000Z

157

Formation of negative hydrogen ions in 7-keV OH+ + Ar and OH+ + acetone collisions: a general process for H-bearing molecular species  

E-Print Network [OSTI]

We demonstrate that the formation of negative hydrogen ions (H-) occurs in a wide class of atomic and molecular collisions. In our experiments, H- emission from hydroxyl cations and acetone molecules was observed in keV-energy collisions. We show that hydride (H-) anions are formed via direct collisional fragmentation of molecules, followed by electron grabbing by fast hydrogen fragments. Such general mechanism in hydrogen-containing molecules may significantly influence reaction networks in planetary atmospheres and astrophysical media and new reaction pathways may have to be added in radiolysis studies.

Juhász, Zoltán; Rangama, Jimmy; Bene, Erika; Sorgunlu-Frankland, Burcu; Frémont, François; Chesnel, Jean-Yves

2015-01-01T23:59:59.000Z

158

NSLS (National Synchrotron Light Source) X-19A beamline performance for x-ray absorption measurements  

SciTech Connect (OSTI)

Characterization of the X-19A beamline at the National Synchrotron Light Source (NSLS) is described. The beamline is designed for high resolution x-ray absorption spectroscopy over a wide energy range. All of the beamline optical components are compatible with ultrahigh vacuum (UHV) operation. This permits measurements to be made in a window-less mode, thereby facilitating lower energy (<4 KeV) studies. To upgrade the beamline performance, several possible improvements in instrumentation and practice are discussed to increase photon statistics with an optimum energy resolution, while decreasing the harmonic contamination and noise level. A special effort has been made to improve the stability and UHV compatibility of the monochromator system. Initial x-ray absorption results demonstrate the capabilities of this beamline for x-ray absorption studies of low Z elements (e.g. S) in highly dilute systems. The future use of this beamline for carrying out various x-ray absorption experiments is presented. 10 refs., 4 figs.

Yang, C.Y.; Penner-Hahn, J.E.; Stefan, P.M. (Michigan Univ., Ann Arbor, MI (USA). Dept. of Chemistry; Brookhaven National Lab., Upton, NY (USA))

1989-01-01T23:59:59.000Z

159

Polarimetric performance of a Laue lens gamma-ray CdZnTe focal plane prototype  

SciTech Connect (OSTI)

A gamma-ray telescope mission concept [gamma ray imager (GRI)] based on Laue focusing techniques has been proposed in reply to the European Space Agency call for mission ideas within the framework of the next decade planning (Cosmic Vision 2015-2025). In order to optimize the design of a focal plane for this satellite mission, a CdZnTe detector prototype has been tested at the European Synchrotron Radiation Facility under an {approx}100% polarized gamma-ray beam. The spectroscopic, imaging, and timing performances were studied and in particular its potential as a polarimeter was evaluated. Polarization has been recognized as being a very important observational parameter in high energy astrophysics (>100 keV) and therefore this capability has been specifically included as part of the GRI mission proposal. The prototype detector tested was a 5 mm thick CdZnTe array with an 11x11 active pixel matrix (pixel area of 2.5x2.5 mm{sup 2}). The detector was irradiated by a monochromatic linearly polarized beam with a spot diameter of about 0.5 mm over the energy range between 150 and 750 keV. Polarimetric Q factors of 0.35 and double event relative detection efficiency of 20% were obtained. Further measurements were performed with a copper Laue monochromator crystal placed between the beam and the detector prototype. In this configuration we have demonstrated that a polarized beam does not change its polarization level and direction after undergoing a small angle (<1 deg.) Laue diffraction inside a crystal.

Curado da Silva, R. M. [Departmento de Fisica, Universidade de Coimbra, P-3000 Coimbra (Portugal); Center for Space Radiations, Univesite Catholique de Louvain (Belgium); Caroli, E.; Stephen, J. B.; Schiavone, F.; Donati, A.; Ventura, G. [Istituto di Astrofisica Spaziale e Fisica Cosmica-Bologna, Via Gobetti 101, I-40129 Bologna (Italy); Pisa, A.; Auricchio, N.; Frontera, F. [Dipartimento di Fisica, Universita di Ferrara, Ferrara (Italy); Del Sordo, S. [Istituto di Astrofisica Spaziale e Fisica Cosmica-Palermo, Via Ugo La Malfa 153, 90146 Palermo (Italy); Honkimaeki, V. [European Synchrotron Radiation Facility, Grenoble (France); Trindade, A. M. F. [Departmento de Fisica, Universidade de Coimbra, P-3000 Coimbra (Portugal)

2008-10-15T23:59:59.000Z

160

Microsoft PowerPoint - IXD-NSLSII_Poster_Bai  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

crystal sagittal focusing monochromator (Bottom) IXD beamline layout Catalysis: Water gas shift reaction Real-Time Catalysis: In-Situ Structural Studies for Producing and...

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Electrocatalysis in Alkaline Electrolytes - Research Overview  

Broader source: Energy.gov (indexed) [DOE]

Binding Site EXAFS (> 50 eV) * Geometric information * Bond length * Coordination number *BULK short range order Synchrotron Monochromator I o Spectro-electrochemical Cell...

162

E-Print Network 3.0 - approaches neoadjuvant chemotherapy Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of optical spectroscopy in early monitoring of neo-adjuvant... chemotherapy Xenon Arc Lamp + Monochromator Collection Fibers In vivo Breast Tissue Illumination Fibers Imaging...

163

GL Report BU 355  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

29 5 16 22 29 - - - - - - - - Conserv & Renew Energy NFGCR CAREM 4 3 3 11 9 - - - - - - - - - - - - - - - ...

164

Analytical SuperSTEM for extraterrestrial materials research  

SciTech Connect (OSTI)

Electron-beam studies of extraterrestrial materials with significantly improved spatial resolution, energy resolution and sensitivity are enabled using a 300 keV SuperSTEM scanning transmission electron microscope with a monochromator and two spherical aberration correctors. The improved technical capabilities enable analyses previously not possible. Mineral structures can be directly imaged and analyzed with single-atomic-column resolution, liquids and implanted gases can be detected, and UV-VIS optical properties can be measured. Detection limits for minor/trace elements in thin (<100 nm thick) specimens are improved such that quantitative measurements of some extend to the sub-500 ppm level. Electron energy-loss spectroscopy (EELS) can be carried out with 0.10-0.20 eV energy resolution and atomic-scale spatial resolution such that variations in oxidation state from one atomic column to another can be detected. Petrographic mapping is extended down to the atomic scale using energy-dispersive x-ray spectroscopy (EDS) and energy-filtered transmission electron microscopy (EFTEM) imaging. Technical capabilities and examples of the applications of SuperSTEM to extraterrestrial materials are presented, including the UV spectral properties and organic carbon K-edge fine structure of carbonaceous matter in interplanetary dust particles (IDPs), x-ray elemental maps showing the nanometer-scale distribution of carbon within GEMS (glass with embedded metal and sulfides), the first detection and quantification of trace Ti in GEMS using EDS, and detection of molecular H{sub 2}O in vesicles and implanted H{sub 2} and He in irradiated mineral and glass grains.

Bradley, J P; Dai, Z R

2009-09-08T23:59:59.000Z

165

2/21/11 11:08 AMOregon Quarterly Features Page 1 of 4http://www.oregonquarterly.com/winter2010/feature4.php  

E-Print Network [OSTI]

/feature4.php UO Home | Dept index Winter 2010 | Volume 90, Number 2 Donate to OQ | Past Issues:08 AMOregon Quarterly Features Page 2 of 4http://www.oregonquarterly.com/winter2010/feature4.php monochrome

Richmond, Geraldine L.

166

Ris-R-1211(EN) Development of Optically Stimulated  

E-Print Network [OSTI]

with those obtained in the laboratory using dif- ferent gamma sources and these comparisons show.4 Monochromators and Spectrometry 48 3.5 Development of Single Grain OSL Attachment Systems 55 3.6 Other OSL

167

The SLS optics beamline  

E-Print Network [OSTI]

The SLS Optics Beamline U. Flechsig ? , R. Abela ? , R.in the ?eld of x-ray optics and synchrotron radiation in-radiation, beamline optics, channel cut monochromator,

2006-01-01T23:59:59.000Z

168

Structure and dynamics of the microbial communities underlying the carboxylate platform for biofuel production  

E-Print Network [OSTI]

community analysis of a biogas-producing completely stirredwaste into acids, alcohols, biogas, and hydrogen (5, 16, 25,

Hollister, E.B.

2012-01-01T23:59:59.000Z

169

Purpuric drug eruption and alopecia induced by erlotinib  

E-Print Network [OSTI]

18 (5): 16 Department of Dermatology, Fukushima MedicalUniversity, Fukushima, Japan Abstract We herein report a

Nakamura-Wakatsuki, Taeko; Yamamoto, Toshiyuki

2012-01-01T23:59:59.000Z

170

Ohio Farmer Attitudes About Climate Change  

E-Print Network [OSTI]

5/16/2014 1 Ohio Farmer Attitudes About Climate Change Thursday, May 15, 2014 Byrd Polar Research Climate Assessment Report--Agriculture Section #12;5/16/2014 2 USDA Corn CAP Grant (OSU--Moore, Lal, Dick' Attitudes about Climate Change (2012) #12;5/16/2014 14 Sugar Creek Amish 83% Non Amish 39% USA CORN BELT

Howat, Ian M.

171

Time and spectrum-resolving multiphoton correlator for 300–900?nm  

SciTech Connect (OSTI)

We demonstrate a single-photon sensitive spectrometer in the visible range, which allows us to perform time-resolved and multi-photon spectral correlation measurements at room temperature. It is based on a monochromator composed of two gratings, collimation optics, and an array of single photon avalanche diodes. The time resolution can reach 110 ps and the spectral resolution is 2?nm/pixel, limited by the design of the monochromator. This technique can easily be combined with commercial monochromators and can be useful for joint spectrum measurements of two photons emitted in the process of parametric down conversion, as well as time-resolved spectrum measurements in optical coherence tomography or medical physics applications.

Johnsen, Kelsey D.; Thibault, Marilyne; Jennewein, Thomas [Institute for Quantum Computing and Department for Physics and Astronomy, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1 (Canada); Kolenderski, Piotr, E-mail: kolenderski@fizyka.umk.pl [Institute for Quantum Computing and Department for Physics and Astronomy, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1 (Canada); Faculty of Physics, Astronomy and Informatics, Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun (Poland); Scarcella, Carmelo; Tosi, Alberto [Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano (Italy)

2014-10-14T23:59:59.000Z

172

Experimental Demonstration of a Soft X-ray Self-seeded Free-electron Laser  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

The Linac Coherent Light Source (LCLS) has added self-seeding capability to the soft x-ray range using a grating monochromator system. We report demonstration of soft x-ray self-seeding with a measured resolving power of 2000-5000, wavelength stability of 10-4, and an increase in peak brightness by a factor of 2-5 across the photon energy range of 500-1000 eV. By avoiding the need for a monochromator at the experimental station, the self-seeded beam can deliver as much as 50 fold higher brightness to users.

Ratner, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Abela, R. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Amann, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Behrens, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bohler, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bouchard, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bostedt, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Boyes, M. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Chow, K. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Cocco, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Decker, F. J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Ding, Y. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Eckman, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Emma, P. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Fairley, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Feng, Y. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Field, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Flechsig, U. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Gassner, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Hastings, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Heimann, P. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Huang, Z. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Kelez, N. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Krzywinski, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Loos, H. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Lutman, A. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Marinelli, A. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Marcus, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Maxwell, T. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Moeller, S. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Morton, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Nuhn, H. D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Rodes, N. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Schlotter, W. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Serkez, S. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Stevens, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Turner, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Walz, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Welch, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Wu, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States)

2015-02-06T23:59:59.000Z

173

Lab Process AreaWhere CORAL Name It is: It does: Maker/Model Units per:(self-run) if staff EBL e-beam write24-041 Elionix 125 keV, hi-res e-beam writer Elionix F-125 7 hr 7  

E-Print Network [OSTI]

Lab Process AreaWhere CORAL Name It is: It does: Maker/Model Units per:(self-run) if staff EBL e, bakes 8 hr 12 EML photo photo coater-EML spinner coats PR Solitec 8 hr 12 EML metrologyhall dektak EML diffusion Resonetics rm OxidationTube tube furnace wet & dry ox, anneals, bakesLindberg 8 hr 12

Culpepper, Martin L.

174

CX-009004: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

04: Categorical Exclusion Determination CX-009004: Categorical Exclusion Determination "Solar Panels on Hudson County Facilities CX(s) Applied: B5.16 Date: 08272012 Location(s):...

175

CX-011402: Categorical Exclusion Determination | Department of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Categorical Exclusion Determination CX-011402: Categorical Exclusion Determination Apel Steel Corporation CX(s) Applied: B5.16 Date: 11072013 Location(s): Alabama Offices(s):...

176

CX-009005: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Henderson Solar Energy Project CX(s) Applied: B5.16 Date: 08/22/2012 Location(s): Nevada Offices(s): Golden Field Office

177

CX-010502: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

Sacramento Municipal Utility District: Community Renewable Energy Deployment- Coenergy Solar Facility at Sutter's Landing Park CX(s) Applied: B5.16 Date: 06032013 Location(s):...

178

Auger resonance study for the C1s 2pi* excitation of CO  

E-Print Network [OSTI]

monochromator resolution it is now possible to study the Auger spectra of diatomic molecules such as carbon monoxide (CO) in great detail. Our current study of CO, focuses on the computation of photoionization cross sections for the auger decay of CO after...

Botting, Shaleen Kaye

1997-01-01T23:59:59.000Z

179

INHIBITION OF PHOTOSYNTHESIS IN CERTAIN ALGAE BY EXTREME RED LIGHT  

E-Print Network [OSTI]

INHIBITION OF PHOTOSYNTHESIS IN CERTAIN ALGAE BY EXTREME RED LIGHT GOVINDJEE, EUGENE RABINOWITCH. INTRODUCTION It was shown in preceding papers (9, 10) that when the unicellular red alga Por- phyridium), these algae, when exposed to monochromatic light (bands isolated by a grating monochromator, band half

Govindjee

180

Correction of Emission Crosstalk for FRET sensors By Teng-Leong Chew and Rex L. Chisholm  

E-Print Network [OSTI]

1 Correction of Emission Crosstalk for FRET sensors By Teng-Leong Chew and Rex L. Chisholm Excerpt. The superscript "y" can be replaced by "b" to indicate that the monochrome image has been background subtracted. For example: b dF represents a background-subtracted image of the donor fluorophore taken using the FRET

Goldman, Robert D.

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

A Quantitative Analysis of Disk Drive Power Management in Portable Computers  

E-Print Network [OSTI]

the question of power management begins with an analysis of where the energy is being consumed. Table 1 gives) Percent of Total Display Compaq monochrome lite25c 3.5 68% Disk Drive (105 Mbytes) Maxtor MXL­105 III 1 of inactivity. In this paper, we perform a quantitative analysis of the potential costs and benefits of spinning

Anderson, Tom

182

The Development of the GCPCC Protein Crystallography Beamline at CAMD  

E-Print Network [OSTI]

as a simple synchrotron with a bending radius of 0.71 meters. For heat-load calculations, all five wiggler heat load on the first monochromator crystal by acting as a low pass filter. The wavelength is selected. The beamline design, with supporting calculations and ray tracing, is presented to substantiate the expected

Phillips, George N. Jr.

183

Theoretical analysis and experiments on antireflection coatings for laser diodes  

E-Print Network [OSTI]

was set on dB, the time constant ivas 100 ms, and the sensitivity was 10 mV. A special controller was designed and constructed to operate the monochromator and to provide a, voltage proportional to the grating position. The X-axis of the plotter ivas...

Chin, Kai Jian

1987-01-01T23:59:59.000Z

184

Resonance Raman spectroscopy in Si and C ion-implanted double-wall carbon nanotubes  

E-Print Network [OSTI]

The effect of 170 keV Si and 100 keV C ion bombardment on the structure and properties of highly pure, double-wall carbon nanotubes has been investigated using resonance Raman spectroscopy. The implantations were performed ...

Dresselhaus, Mildred

185

E-Print Network 3.0 - accelerator orela workshop Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

From the s process 130 132 134 136 138 Summary: precise ORELA data are making meaningful test of this red giant stardust model possible. More (n,?) data... T6 keV kT8 keV...

186

Internal conversion coefficients in (134)Cs, (137)Ba, and (139)La: A precise test of theory  

E-Print Network [OSTI]

Recently we measured the ratio of K-shell internal conversion coefficients, alpha(K), for the 127.5-keV E3 transition in (134)Cs and the 661.7-keV M4 transition in (137)Ba. We here report a measurement of the 165.9-keV M1 transition in (139)La...

Nica, N.; Hardy, John C.; Iacob, V. E.; Balonek, C.; Trzhaskovskaya, M. B.

2008-01-01T23:59:59.000Z

187

REFLECT: A computer program for the x-ray reflectivity of bent perfect crystals  

SciTech Connect (OSTI)

The design of monochromators for x-ray applications, using either standard laboratory sources on synchrotron radiation sources, requires a knowledge of the reflectivity of the crystals. The reflectivity depends on the crystals used, the geometry of the reflection, the energy range of the radiation, and, in the present case, the cylindrical bending radius of the optical device. This report is intended to allow the reader to become familiar with, and therefore use, a computer program called REFLECT which we have used in the design of a dual beam Laue monochromator for synchrotron angiography. The results of REFLECT have been compared to measured reflectivities for both bent Bragg and Laue geometries. The results are excellent and should give full confidence in the use of the program. 6 refs.

Etelaeniemi, V.; Suortti, P.; Thomlinson, W. (Helsinki Univ. (Finland). Dept. of Physics; Brookhaven National Lab., Upton, NY (USA))

1989-09-01T23:59:59.000Z

188

High resolution ion Doppler spectroscopy at Prairie View Rotamak  

SciTech Connect (OSTI)

A fast ion Doppler spectroscopy (IDS) diagnostic system is installed on the Prairie View Rotamak to measure ion temperature and plasma flow. The diagnostic employs a single channel photomultiplier tube and a Jarrell-Ash 50 monochromator with a diffraction grating line density of 1180 lines/mm, which allows for first order spectra of 200-600 nm. The motorized gear of the monochromator allows spectral resolution of 0.01 nm. Equal IDS measurements are observed for various impurity emission lines of which carbon lines exhibit stronger intensities. Furthermore, the diagnostics is examined in an experiment where plasma experiences sudden disruption and quick recovery. In this case, the IDS measurements show {approx}130% increase in ion temperature. Flow measurements are shown to be consistent with plasma rotation.

Houshmandyar, Saeid; Yang Xiaokang [Solar Observatory Department, Prairie View A and M University, Prairie View, Texas 77446 (United States); Magee, Richard [Department of Physics, West Virginia University, Morgantown, West Virginia 26506 (United States)

2012-10-15T23:59:59.000Z

189

The new very small angle neutron scattering spectrometer at Laboratoire Leon Brillouin  

E-Print Network [OSTI]

The design and characteristics of the new very small angle neutron scattering spectrometer under construction at the Laboratoire Leon Brillouin is described. Its goal is to extend the range of scattering vectors magnitudes towards 2x10{-4} /A. The unique feature of this new spectrometer is a high resolution two dimensional image plate detector sensitive to neutrons. The wavelength selection is achieved by a double reflection supermirror monochromator and the collimator uses a novel multibeam design.

Sylvain Desert; Vincent Thevenot; Julian Oberdisse; Annie Brulet

2007-06-12T23:59:59.000Z

190

Water-cooled ion-milled diffraction gratings for the synchrotron radiation community  

SciTech Connect (OSTI)

Key technical and strategic choices are reviewed, leading to the fabrication method of ion-milled grating grooves for the monochromators at the Advanced Light Source (ALS) at Lawrence Berkeley Laboratory (LBL), and for other synchrotrons. Several laboratories and their industrial partners have joined to manufacture gratings with essentially theoretical performance. Metrology -data and theoretical comparisons are given for square wave profile grating samples ion-milled into electroless nickel surfaces. The extensive capabilities of Hughes Aircraft in grating manufacture are reviewed.

McKinney, W.R.; Shannon, C.L.; Shults, E.N.

1993-08-01T23:59:59.000Z

191

High-harmonic XUV source for time- and angle-resolved photoemission spectroscopy  

SciTech Connect (OSTI)

We present a laser-based apparatus for visible pump/XUV probe time- and angle-resolved photoemission spectroscopy (TRARPES) utilizing high-harmonic generation from a noble gas. Femtosecond temporal resolution for each selected harmonic is achieved by using a time-delay-compensated monochromator (TCM). The source has been used to obtain photoemission spectra from insulators (UO{sub 2}) and ultrafast pump/probe processes in semiconductors (GaAs).

Dakovski, Georgi L [Los Alamos National Laboratory; Li, Yinwan [Los Alamos National Laboratory; Durakiewicz, Tomasz [Los Alamos National Laboratory; Rodriguez, George [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

192

Large-Area Zone Plate Fabrication with Optical Lithography  

SciTech Connect (OSTI)

Zone plates as condenser optics for x-ray microscopes offer simple optical designs for both illumination and spectral resolution when used as a linear monochromator. However, due to the long write times for electron beam lithography, both the availability and the size of zone plates for condensers have been limited. Since the resolution provided by the linear monochromator scales almost linearly with the diameter of the zone plate, the full potential for zone plate monochromators as illumination systems for x-ray microscopes has not been achieved. For example, the 10-mm-diameter zone plate has demonstrated a spectral resolution of E/{Delta}E = 700[1], but with a 26-mm-diameter zone plate, the calculated spectral resolution is higher than E/{Delta}E = 3000. These large-area zone plates are possible to fabricate with the leading edge semiconductor lithography tools such as those available at the College of Nanoscale Science and Engineering at the University at Albany. One of the lithography tools available is the ASML TWINSCAN XT: 1950i with 37-nm resolution [2]. A single 300-mm wafer can contain more than 60 fields, each with a large area condenser, and the throughput of the tool can be more than one wafer every minute.

Denbeaux, G. [College of Nanoscale Science and Engineering, University at Albany, 255 Fuller Road, Albany, NY 12203 (United States)

2011-09-09T23:59:59.000Z

193

TableHC14.5.xls  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7.6 16.6 Do Not Have Heating Equpment... 1.2 0.7 Q 0.7 Have Space Heating Equpment... 109.8 23.4 7.5 16.0 Use Space Heating...

194

CX-007909: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

Exclusion Determination Ambler Boiler House Geothermal Wells, Cool Roof and Photovoltaic installation CX(s) Applied: B5.1, B5.16, B5.19 Date: 02082012 Location(s):...

195

CX-007875: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

Exclusion Determination Ambler Boiler House Geothermal Wells, Cool Roof and Photovoltaic installation CX(s) Applied: B5.1, B5.16, B5.19 Date: No date. Location(s):...

196

E-Print Network 3.0 - arkadi ebber veiko Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Annette Ebbers-Baumann1 , Ansgar Grune1... of Computer Science I, D-53117 Bonn, Germany ebbers, gruene, rolf.klein@cs.uni-bonn.de 2 University of Bonn... , pp. 5-16, 2005....

197

CX-007424: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

Exclusion Determination CX-007424: Categorical Exclusion Determination City of Houston Wind Project CX(s) Applied: B5.16, B5.18 Date: 12132011 Location(s): Texas Offices(s):...

198

Potential Energy Savings and CO2 Emissions Reduction of China's Cement Industry  

E-Print Network [OSTI]

5.16 EJ in 2009. Primary energy consumption This article wasconsumption (EJ) Primary energy consumption Figure 2. China’that China’s total primary energy consumption will rise

Ke, Jing

2013-01-01T23:59:59.000Z

199

CX-008596: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Northeast Provider of Solar Instructor Training - North CX(s) Applied: A9, A11, B5.16 Date: 07/16/2012 Location(s): Maine Offices(s): Golden Field Office

200

CX-010251: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

University of Louisville- Sustainable Buildings CX(s) Applied: B1.15, B5.16, B5.17 Date: 03/20/2013 Location(s): Kentucky Offices(s): Golden Field Office

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

A Low-Carbon Fuel Standard for California, Part 1: Technical Analysis  

E-Print Network [OSTI]

biofuel”) and bio-based and FT diesel fuels are indicated,Diesel Bio-Diesel Hydrogen Electric Figure 5-6: Fuel energyDiesel Bio-Diesel Hydrogen Electric Figure 5-16: Fuel energy

Farrell, Alexander E.; Sperling, Dan

2007-01-01T23:59:59.000Z

202

CX-010269: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Renewable Energy Initiatives for Clark County, Nevada CX(s) Applied: A9, B5.16 Date: 05/16/2013 Location(s): Nevada Offices(s): Golden Field Office

203

Intracellular Mechanisms of Adult Neural Progenitor Proliferation and Self-Renewal  

E-Print Network [OSTI]

Appl Biochem 40:5-16. 44. Peltier J, Schaffer DV. (2010).death. Nature 411:42-43. 49. Peltier J, O'Neill A, Schafferaccepted for publication as Peltier J, O’Neill A, Schaffer

Peltier, Joseph Charles

2010-01-01T23:59:59.000Z

204

CX-012014: Categorical Exclusion Determination  

Office of Energy Efficiency and Renewable Energy (EERE)

Deployable Commercial Rooftop Solar Electric System CX(s) Applied: A9, B3.6, B5.16 Date: 04/17/2014 Location(s): New York Offices(s): Golden Field Office

205

CX-008988: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

Categorical Exclusion Determination "The Institute for Energy, Environment, and Sustainability CX(s) Applied: A9, B5.16 Date: 08152012 Location(s): Kansas Offices(s): Golden...

206

CX-010267: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Energy Efficiency and Conservation Block Grant Program- City of Fort Lauderdale, Florida CX(s) Applied: B5.1, B5.16 Date: 05/02/2013 Location(s): Florida Offices(s): Golden Field Office

207

Global Climate Change and National Security  

E-Print Network [OSTI]

5/16/2014 1 Global Climate Change and National Security RADM Jon White Oceanographer and Navigator months. · Oil, gas, and mineral resource exploitation expected to continue · Production/transportatio n

Howat, Ian M.

208

CX-008980: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

0: Categorical Exclusion Determination CX-008980: Categorical Exclusion Determination "CaliforniaHawaii Provider of Solar Instructor Training CX(s) Applied: A9, A11 B5.16 Date:...

209

CX-010256: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Sherwood Valley Rancheria of Pomo Indians CX(s) Applied: B5.16 Date: 04/18/2013 Location(s): California Offices(s): Golden Field Office

210

Results of a Si/CdTe Compton Telescope  

E-Print Network [OSTI]

We have been developing a semiconductor Compton telescope to explore the universe in the energy band from several tens of keV to a few MeV. We use a Si strip and CdTe pixel detector for the Compton telescope to cover an energy range from 60 keV. For energies above several hundred keV, the higher efficiency of CdTe semiconductor in comparison with Si is expected to play an important role as an absorber and a scatterer. In order to demonstrate the spectral and imaging capability of a CdTe-based Compton Telescope, we have developed a Compton telescope consisting of a stack of CdTe pixel detectors as a small scale prototype. With this prototype, we succeeded in reconstructing images and spectra by solving the Compton equation from 122 keV to 662 keV. The energy resolution (FWHM) of reconstructed spectra is 7.3 keV at 511 keV and 3.1 keV at 122 keV, respectively. The angular resolution obtained at 511 keV is measured to be 12.2 degree (FWHM).

Kousuke Oonuki; Takaaki Tanaka; Shin Watanabe; Shin'ichiro Takeda; Kazuhiro Nakazawa; Takefumi Mitani; Tadayuki Takahashi; Hiroyasu Tajima; Yasushi Fukazawa; Masaharu Nomachi

2005-09-21T23:59:59.000Z

211

DETERMINATION AND CHARACTERIZATION OF DEEP LEVELS IN p-CdTe(Cl)  

E-Print Network [OSTI]

photons de 122 keV (57Co) et de 5 keV pour des photons de 59 keV (241Am). Abstract. 2014 CdTe single doped CdTe single crystals grown from tellurium solvent have a good resolution for gamma-rays, when. The investigation of the energy levels system of charged centres in CdTe, as well as in other II-VI compounds

Paris-Sud XI, Université de

212

Columbia University X-Ray Measurements  

E-Print Network [OSTI]

V-720 keV · NaI 2x2x2" detector views an energy range of 1 keV-3 MeV Store signal in the tree. computer configuration. Plasmas were created using multi-frequency ECRH, and we find that most of the plasma energy is stored in the fast electrons. The energy spectrum of the x-ray emission below 740 keV is measured

213

Ned Sauthoff U.S. ITER Planning Officer  

E-Print Network [OSTI]

++ (3.5 MeV) + n0 (14.1 MeV) #12;Three Different Approaches F = q E + (q/c) V B Magnetic Inertial-particle confinement/heating, kinetic-MHD and energetic- particle modes larger-scale MHD, beta-limits, wall modes Ion Temperature (keV) LawsonFusionParameter,niTiE(1020m-3kevs) Central Ion Temperature (keV) Tokamaks

214

Re-publication of the data from the BILL magnetic spectrometer: The cumulative $?$ spectra of the fission products of $^{235}$U, $^{239}$Pu, and $^{241}$Pu  

E-Print Network [OSTI]

In the 1980s, measurements of the cumulative $\\beta$ spectra of the fission products following the thermal neutron induced fission of $^{235}$U, $^{239}$Pu, and $^{241}$Pu were performed at the magnetic spectrometer BILL at the ILL in Grenoble. This data was published in bins of 250 keV. In this paper, we re-publish the original data in a binning of 50 keV for $^{235}$U and 100 keV for $^{239}$Pu and $^{241}$Pu.

N. Haag; W. Gelletly; F. von Feilitzsch; L. Oberauer; W. Potzel; K. Schreckenbach; A. A. Sonzogni

2014-05-30T23:59:59.000Z

215

NIVEAUX EXCITS DU 50Sn11666 Par J. COLARD (*), P. GEPTS (**), L. GRENACS, A. JONES (***)  

E-Print Network [OSTI]

électrons de conversion externe ont été obtenus par effet photoélectrique dans une feuille d'uranium naturel transition de 1 756 keV. La méthode des conversions internes indique pour le niveau de 2 535 keV J = 4 et la the existence of the 1 756 keV transition. The internal conversion method indicates J = 4 and positive parity

Paris-Sud XI, Université de

216

Generating X-ray lines from annihilating dark matter  

E-Print Network [OSTI]

We propose different scenarios where a keV dark matter annihilates to produce a monochromatic signal. The process is generated through the exchange of a light scalar of mass of order 300 keV - 50 MeV coupling to photon through loops or higher dimensional operators. For natural values of the couplings and scales, the model can generate a gamma-ray line which can fit with the recently identified 3.5 keV X-ray line.

Emilian Dudas; Lucien Heurtier; Yann Mambrini

2014-05-08T23:59:59.000Z

217

E-Print Network 3.0 - auf die sorption Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Universitt Dortmund Collection: Computer Technologies and Information Sciences 85 1 Solare Neutrinos 1.1 Ursprung solarer Neutrinos Summary: Verteilungsfunktionen bei 300keV...

218

Mass spectrometry with a very small cyclotron  

SciTech Connect (OSTI)

It is proposed that direct detection of natural radioisotopes can be accomplished by using a very low energy (20 to 100 keV) cyclotron accelerating negative ions.

Muller, R.A.; Tans, P.P.; Mast, T.S.; Welch, J.J.

1981-05-01T23:59:59.000Z

219

E-Print Network 3.0 - annihilation coincidence peak Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

peak is seen at 3375 keV with 6000... . the annihilation spectra from the polyethylene and gold tar- ... Source: Golovchenko, Jene A. - Department of Physics, Harvard...

220

The beta decay of cesium 138 to levels in barium 138  

E-Print Network [OSTI]

. Coincidence electronics. 32 7. Gamma spectrum in coincidence with 409 ? 463 keV gate. 37 8. Gamma spectrum in coincidence with the 1436 keV gate. 39 9. Gamma spectrum in coincidence with the 2218 keV gate. 41 10. Gamma spectrum in coincidence... included 91 gamma rays and 18 levels and is shown in Fig, 1. MGMK found that their decay scheme confirmed that of BDMS with only minor changes in the energies of the levels. They also reported a state of 2880. 7 keV thought to be the 3 collective 6...

Fuller, Douglas Feril

1970-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

The Implementation of Photon Polarization into the Mercury Transport Code  

E-Print Network [OSTI]

of . ............................. 33 Figure 10. U/I for the coherently scattered portion of a 5 keV photon beam with a source Stokes vector of . ............................. 33 Figure 11. V/I for the coherently scattered portion of a 5 keV photon beam... of . ................................ 34 vi Figure 13. P for the coherently scattered portion of a 5 keV photon beam with a source Stokes vector of . ................................ 35 Figure 14. ? for the coherently scattered portion of a 5 keV photon...

Windsor, Ethan

2014-06-04T23:59:59.000Z

222

E-Print Network 3.0 - aluminium-induced ion transport Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Weak Shear... and Reversed Shear plasmas Investigation of energetic ion transport during AEs - Summary Table of Contents 12... keV, PNNB>4MW) energetic ion ... Source:...

223

E-Print Network 3.0 - au-mos2 films sputtered Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cryogenic films of hydrogen by keV ions: Thickness dependence and surface morphology... , solid hydrogen 1. The sputtering of thick films takes places via non-radiative...

224

atrial tachycardia emanating: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

source of background. Notable for dark matter experiments is the production of radon progeny recoils (RPRs), the low energy (100 keV) recoils of radon daughter isotopes,...

225

Characterization and calibration of compact array spectrometers in the ultraviolet spectral region  

SciTech Connect (OSTI)

Array-based spectrometers, with their compact size, low weight, low cost, and fast measurement time, are now frequently used in place of both conventional single-channel scanning monochromators, and broadband meters. Their rapid measurement capability makes them an attractive option for routine solar UV spectral measurements, where shortterm variability in signal is a challenge. However, compactness, portability, low cost and high speed are achieved at the expense of the spectrometer's optical and electronic performance. Thus such spectrometers are more prone to measurement error from environmental changes, and more prone to other intrinsic sources of error such as stray light and detector non-linearity, which significantly affect solar UV measurements, than a scanning monochromator. The effects of stray light and non-linearity can be reduced either by improved optical and detector design or by a detailed spectrometer characterization. We present in this paper our investigation of the performance of three different commercial array spectrometers: two mini-spectrometers, and a more elaborate array spectrometer with an on-board image amplifier device. These were tested for a subset of performance parameters: their wavelength accuracy and stability, electronic linearity, responsivity linearity, stray light sensitivity, and mechanical stability and repeatability. With all three spectrometers we found that these parameters, particularly but not limited to stray light, had a significant impact on the measurement of the incoming optical radiation. This meant that, without characterization, the instruments would be unable to accurately measure the UV component of any source with significant visible radiation. We discuss various simple and low-cost solutions for improving the performance of these instruments, and providing a rigorous calibration using a straightforward set-up including optical filters and the quasi-monochromatic light from a double monochromator.

Shindo, Francois [Measurement Standards Laboratory of New Zealand, Industrial Research, Lower Hutt (New Zealand); Woolliams, Emma; Scott, Barry; Harris, Subrena [National Physical Laboratory, Teddington (United Kingdom)

2013-05-10T23:59:59.000Z

226

Efficiency and stray light measurements and calculations of diffraction gratings for the Advanced Light Source  

SciTech Connect (OSTI)

Water-cooled gratings manufactured for spherical grating monochromators of the Advanced Light Source beamlines 7.0, 8.0, and 9.0 were measured with the laser plasma source and reflectometer in the Center for X-ray Optics at Lawrence Berkeley Laboratory. The square-wave gratings are ion milled into the polished electroless nickel surface after patterning by holographic photolithography. Absolute efficiency data are compared with exact electromagnetic theory calculation. Interorder stray light and groove depths can be estimated from the measurements.

McKinney, W.R.; Mossessian, D. (Accelerator and Fusion Research Division, Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)); Gullikson, E. (Materials Sciences Division, Center for X-ray Optics, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)); Heimann, P. (Accelerator and Fusion Research Division, Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States))

1995-02-01T23:59:59.000Z

227

Efficiency and stray light measurements and calculations of diffraction gratings for the ALS  

SciTech Connect (OSTI)

Water cooled gratings manufactured for spherical grating monochromators of the Advanced Light Source beamlines 7.0, 8.0 and 9.0 were measured with the laser plasma source and reflectometer in the Center for X-ray Optics at LBL. The square-wave gratings are ion-milled into the polished electroless nickel surface after patterning by holographic photolithography. Absolute efficiency data are compared with exact electromagnetic theory calculation. Inter-order stray light and groove depths can be estimated from the measurements.

McKinney, W.R.; Mossessian, D.; Gullikson, E.; Heimann, P.

1994-07-01T23:59:59.000Z

228

Crystal face temperature determination means  

DOE Patents [OSTI]

An optically transparent furnace having a detection apparatus with a pedestal enclosed in an evacuated ampule for growing a crystal thereon is disclosed. Temperature differential is provided by a source heater, a base heater and a cold finger such that material migrates from a polycrystalline source material to grow the crystal. A quartz halogen lamp projects a collimated beam onto the crystal and a reflected beam is analyzed by a double monochromator and photomultiplier detection spectrometer and the detected peak position in the reflected energy spectrum of the reflected beam is interpreted to determine surface temperature of the crystal. 3 figs.

Nason, D.O.; Burger, A.

1994-11-22T23:59:59.000Z

229

Construction and testing of the instrument for neutron holographic study at the Budapest Research Reactor  

SciTech Connect (OSTI)

Neutron scattering device dedicated to neutron holography experiments is described. The device is operating at a constant wavelength prepared by a double focusing monochromator. It is equipped by highly efficient shielding, proper collimator, Eulerian cradle, monitor detector, gamma-ray, and neutron detectors as well. Relevant software serves as control for the measurement and data collection. The harmonized application of the components enumerated above makes our device extremely efficient and unparalleled. Two atomic resolution neutron holographic experiments carried out illustrate the efficiency and power of the instrument.

Marko, Marton; Toeroek, Gyula; Cser, Laszlo [Department of Neutron Spectroscopy, Research Institute for Solid State Physics and Optics, P.O.B. 49, H-1525 Budapest (Hungary); Szakal, Alex [Department of Neutron Spectroscopy, Research Institute for Solid State Physics and Optics, P.O.B. 49, H-1525 Budapest (Hungary); Budapest University of Technology and Economics, Muegyetem rakpart 1-3, H-1113 Budapest (Hungary)

2010-10-15T23:59:59.000Z

230

Study on higher harmonic suppression using edge filter and polished Si wafer  

SciTech Connect (OSTI)

Higher harmonics contamination is a severe problem in synchrotron beamlines where grating monochromators are used. In these beamlines, absorption edge filters and critical angle mirrors are used to suppress the harmonic contaminations. In the present study, carried out using Indus-1 reflectivity beamline, a harmonic suppression characteristic of Al edge filter and polished silicon wafer are determined. It is found that the Al filter suppresses higher harmonics in 2–7% range whereas the polished silicon wafer can suppress the higher harmonics below 1%. The results of comparative study are discussed.

Gupta, R. K., E-mail: rkg@rrcat.gov.in; Singh, Amol, E-mail: rkg@rrcat.gov.in; Modi, Mohammed H., E-mail: rkg@rrcat.gov.in; Lodha, G. S., E-mail: rkg@rrcat.gov.in [X-ray Optics Section, ISU Division, Raja Ramanna Centre for Advanced Technology, Indore-452013 (India)

2014-04-24T23:59:59.000Z

231

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer  

SciTech Connect (OSTI)

A key feature of extreme ultraviolet (XUV) radiation from free-electron lasers (FELs) is its spatial and temporal coherence. We measured the spatio-temporal coherence properties of monochromatized FEL pulses at 13.5?nm using a Michelson interferometer. A temporal coherence time of (59±8) fs has been determined, which is in good agreement with the spectral bandwidth given by the monochromator. Moreover, the spatial coherence in vertical direction amounts to about 15% of the beam diameter and about 12% in horizontal direction. The feasibility of measuring spatio-temporal coherence properties of XUV FEL radiation using interferometric techniques advances machine operation and experimental studies significantly.

Hilbert, V.; Rödel, C.; Zastrau, U., E-mail: ulf.zastrau@uni-jena.de [Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany); Brenner, G.; Düsterer, S.; Dziarzhytski, S.; Harmand, M.; Przystawik, A.; Redlin, H.; Toleikis, S. [Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany); Döppner, T.; Ma, T. [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States); Fletcher, L. [Department of Physics, University of California, Berkeley, California 94720 (United States); Förster, E. [Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany); Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena (Germany); Glenzer, S. H.; Lee, H. J. [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States); Hartley, N. J. [Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Kazak, L.; Komar, D.; Skruszewicz, S. [Institut für Physik, Universität Rostock, 18051 Rostock (Germany); and others

2014-09-08T23:59:59.000Z

232

Bacterial metabolite indole modulates incretin secretion from intestinal enteroendocrine L-cells  

E-Print Network [OSTI]

was used as a control measurement. The dish was mounted in a perfusion chamber on an Olympus IX71 microscope with x40 oil-immersion objective, and imaged using an Orca-ER CCD camera. A 75W Xenon arc lamp and a monochromator (Cairn Research) controlled... ) expressed on the plasma membrane of L-cells, enhancing L-cell number and secretion (Cani et al., 2013; Petersen et al., 2014; Plaisancie et al., 1995; Psichas et al., 2014; Tarini and Wolever, 2010; Tolhurst et al., 2012). Many other bacterial metabolites...

Chimerel, Catalin; Emery, Edward; Summers, David K.; Keyser, Ulrich; Gribble, Fiona M.; Reimann, Frank

2014-01-01T23:59:59.000Z

233

Enhancement of the resolution of full-field optical coherence tomography by using a colour image sensor  

SciTech Connect (OSTI)

The influence of white balance in a colour image detector on the resolution of a full-field optical coherence tomograph (FFOCT) is studied. The change in the interference pulse width depending on the white balance tuning is estimated in the cases of a thermal radiation source (incandescent lamp) and a white light emitting diode. It is shown that by tuning white balance of the detector in a certain range, the FFOCT resolution can be increased by 20 % as compared to the resolution, attained with the use of a monochrome detector. (optical coherence tomography)

Kalyanov, A L; Lychagov, V V; Smirnov, I V; Ryabukho, V P [N.G. Chernyshevsky Saratov State University, Saratov (Russian Federation)

2013-08-31T23:59:59.000Z

234

Positional Roots in Kaqchikel Maya  

E-Print Network [OSTI]

#1;#2;#3;#4;#5;#4;#2;#6;#7;#8; #2;#2;#5;#3; #4;#6; #11;#7;#12; #14;#4;#15;#16;#8; #17;#7;#18;#7; #19;#18; #20;#2;#21;#18;#22;#4;#23;#14;#5; #24;#25;#26;#25; #27;#28;#4;#8;#18; #29;#30; #31; #28;#28;#2;#6;#3; ! #19;#28;#4;#5;#5;#16;" #5;#2; #5;#14;#16...; #23;#22;#7;" #7;#5;#16; "#16;#23;#22;#16;#16; #21;#22;#2;#23;#22;#7;#28; #4;#6; ##4;#6;#23; #4;#3;#5;#4; #3; #7;#6;" #5;#14;#16; $#22;#7;" #7;#5;#16; %#7; #8;#5;#18; #2;& #5;#14;#16; '#6;#4;(#16;#22;#3;#4;#5;#18; #2;& #11;#7;#6;#3;#7;#3; #4;#6; #21...

Tummons, Emily Jane

2010-09-30T23:59:59.000Z

235

E-Print Network 3.0 - alpha spectrometry system Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tandem ion accelerator Proton beam: 200 keV to 6.4 MeV Alpha beam: 200 keV to 9.6 MeV Heavy ions: 200 ke... V to 20 MeV Beam currents: from pA to A (equivalent to mCi to...

236

E-Print Network 3.0 - alpha spectrometry Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tandem ion accelerator Proton beam: 200 keV to 6.4 MeV Alpha beam: 200 keV to 9.6 MeV Heavy ions: 200 ke... V to 20 MeV Beam currents: from pA to A (equivalent to mCi to...

237

E-Print Network 3.0 - alpha spectrometry caracterizacao Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tandem ion accelerator Proton beam: 200 keV to 6.4 MeV Alpha beam: 200 keV to 9.6 MeV Heavy ions: 200 ke... V to 20 MeV Beam currents: from pA to A (equivalent to mCi to...

238

E-Print Network 3.0 - alpha spectrometry measurement Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tandem ion accelerator Proton beam: 200 keV to 6.4 MeV Alpha beam: 200 keV to 9.6 MeV Heavy ions: 200 ke Source: Los Alamos National Laboratory, Theoretical Division, Condensed...

239

Modeling Study of Proposed Field Calibration Source Using K-40 Source and High-Z Targets for Sodium Iodide Detector  

E-Print Network [OSTI]

isotope potassium-40 (40K) are not subject to these restrictions. Potassium-40’s beta spectrum and 1460.8 keV gamma ray can be used to induce K-shell fluorescence x rays in high-Z metals between 60 and 80 keV. A gamma ray calibration source is thus...

Rogers, Jeremy 1987-

2012-10-30T23:59:59.000Z

240

Getting Ready for the Technical Assessment at Snowmass "Go ahead, make my FIRE"  

E-Print Network [OSTI]

reactor - couple with burning plasma physics · Boundary Physics and Plasma Technology (coupled with above overall portfolio approach includes IFE) #12;Comparison of EU One Step to DEMO Power Plant(s) with ARIESV) LawsonFusionParameter,niTiE(1020m-3kevs) Central Ion Temperature (keV) Tokamaks 1993-99 Laser 1986 Direct

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

arXiv:1104.2624v1[astro-ph.SR]13Apr2011 Solar Physics  

E-Print Network [OSTI]

­15 keV, and 15­30 keV energy ranges for each event. In order to extract the height distribution from Northwestern Switzerland, Institute of 4D, Technologies, 5210 Windisch, Switzerland SOLA: paper.tex; 15 April

California at Berkeley, University of

242

asociados al control: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Three measurements of the line width exist: HEAO-C's 1982 value of (0+3) keV FWHM, the GRIS 1996 value of (5.4 +- 1.3) keV FWHM, and the recent RHESSI value of (2.0 +- 0.8)...

243

X-Ray Reflection Nebulae with Large Equivalent Widths of Neutral Iron Ka Line in the Sgr C Region  

E-Print Network [OSTI]

This paper reports on the first results of the Suzaku observation in the Sgr C region. We detected four diffuse clumps with strong line emission at 6.4keV, Ka from neutral or low-ionized Fe. One of them, M359.38-0.00, is newly discovered with Suzaku. The X-ray spectra of the two bright clumps, M359.43-0.07 and M359.47-0.15, after subtracting the Galactic center diffuse X-ray emission (GCDX), exhibit strong Ka line from FeI with large equivalent widths (EWs) of 2.0-2.2keV and clear Kb of FeI. The GCDX in the Sgr C region is composed of the 6.4keV- and 6.7keV-associated components. These are phenomenologically decomposed by taking relations between EWs of the 6.4keV and 6.7keV lines. Then the former EWs against the associated continuum in the bright clump regions are estimated to be 2.4(+2.3_-0.7)keV. Since the two different approaches give similar large EWs of 2keV, we strongly suggest that the 6.4keV clumps in the Sgr C region are due to X-ray reflection/fluorescence (the X-ray reflection nebulae).

Hiroshi Nakajima; Takeshi Go Tsuru; Masayoshi Nobukawa; Hironori Matsumoto; Katsuji Koyama; Hiroshi Murakami; Atsushi Senda; Shigeo Yamauchi

2008-11-12T23:59:59.000Z

244

Virtual monochromatic imaging in dual-source and dual-energy CT for visualization of acute ischemic stroke  

E-Print Network [OSTI]

We have recently developed a phantom that simulates acute ischemic stroke. We attempted to visualize acute-stage cerebral infarction by applying virtual monochromatic images to this phantom using dual-energy CT (DECT). Virtual monochromatic images were created using DECT from 40 to 100 keV at every 10 keV and from 60 to 80 keV at every 1 keV, under three energy conditions of tube voltages with thin (Sn) filters. Calculation of the CNR values allowed us to evaluate the visualization of acute-stage cerebral infarction. The CNR value of a virtual monochromatic image was the highest at 68 keV under 80 kV / Sn 140 kV, at 72 keV under 100 kV / Sn 140 kV, and at 67 keV under 140 kV / 80 kV. The CNR values of virtual monochromatic images between 65 and 75 keV were significantly higher than those obtained for all other created energy images. Therefore, optimal conditions for visualizing acute ischemic stroke were achievable.

Hara, Hidetake; Matsuzawa, Hiroki; Inoue, Toshiyuki; Abe, Shinji; Satoh, Hitoshi; Nakajima, Yasuo

2015-01-01T23:59:59.000Z

245

Single and double ionization of helium within the independent event model  

E-Print Network [OSTI]

the independent event and the independent particle model from 10 keV to 1 MeV for antiprotons and 25 keV to 1 MeV for protons. Results for p-+ He+ are in good agreement with recent calculations based on a numerical solution to the time-dependent Schrodinger...

Wehrman, Laurence Allan

1997-01-01T23:59:59.000Z

246

The BMW-Chandra survey. Serendipitous Source Catalogue  

E-Print Network [OSTI]

We present the BMW-Chandra source catalogue derived from Chandra ACIS-I observations (exposure time >10ks) public as of March 2003 by using a wavelet detection algorithm (Lazzati et al. 1999; Campana et al. 1999). The catalogue contains a total of 21325 sources, 16758 of which are serendipitous. Our sky coverage in the soft band (0.5-2 keV, S/N =3) is ~8 deg^2 for F_X > 10^-13 erg cm^-2 s-1, and ~2 deg^2 for F_X >10^-15 erg cm^-2 s^-1. The catalogue contains information on positions, count rates (and errors) in three energy bands. (total, 0.5-7 keV; soft, 0.5-2 keV; and hard, 2-7keV), and in four additional energy bands, SB1 (0.5-1keV), SB2 (1-2 keV), HB1 (2-4 keV), and HB2 (4-7keV), as well as information on the source extension, and cross-matches with the FIRST, IRAS, 2MASS, and GSC-2 catalogues.

Romano, P; Campana, S; Moretti, A; Panzera, M R; Tagliaferri, G; Mottini, M

2009-01-01T23:59:59.000Z

247

Test of internal-conversion theory with measurements in Cs-134 and Ba-137  

E-Print Network [OSTI]

We have measured the ratio of K-shell internal conversion coefficients, alpha(K), for the 127.5-keV E3 transition in Cs-134 and the 661.7-keV M4 transition in Ba-137. Previous measurements of these alpha(K) values led to a ratio that differed from...

Nica, N.; Hardy, John C.; Iacob, V. E.; Rockwell, W. E.; Trzhaskovskaya, M. B.

2007-01-01T23:59:59.000Z

248

ORIGAMIX, a CdTe-based spectro-imager development for nuclear applications  

E-Print Network [OSTI]

The Astrophysics Division of CEA Saclay has a long history in the development of CdTe based pixelated detection planes for X and gamma-ray astronomy, with time-resolved imaging and spectrometric capabilities. The last generation, named Caliste HD, is an all-in-one modular instrument that fulfills requirements for space applications. Its full-custom front-end electronics is designed to work over a large energy range from 2 keV to 1 MeV with excellent spectroscopic performances, in particular between 10 and 100 keV (0.56 keV FWHM and 0.67 keV FWHM at 13.9 and 59.5 keV). In the frame of the ORIGAMIX project, a consortium based on research laboratories and industrials has been settled in order to develop a new generation of gamma camera. The aim is to develop a system based on the Caliste architecture for post-accidental interventions or homeland security, but integrating new properties (advanced spectrometry, hybrid working mode) and suitable for industry. A first prototype was designed and tested to acquire feedback for further developments. In this study, we particularly focused on spectrometric performances with high energies and high fluxes. Therefore, our device was exposed to energies up to 700 keV (133Ba, 137Cs) and we measured the evolution of energy resolution (0.96 keV at 80 keV, 2.18 keV at 356 keV, 3.33 keV at 662 keV). Detection efficiency decreases after 150 keV, as Compton effect becomes dominant. However, CALISTE is also designed to handle multiple events, enabling Compton scattering reconstruction, which can drastically improve detection efficiencies and dynamic range for higher energies up to 1408 keV (22Na, 60Co, 152Eu) within a 1-mm thick detector. In particular, such spectrometric performances obtained with 152Eu and 60Co were never measured before with this kind of detector.

S. Dubos; H. Lemaire; S. Schanne; O. Limousin; F. Carrel; V. Schoepff; C. Blondel

2015-02-05T23:59:59.000Z

249

Measurements of Scintillation Efficiency and Pulse-Shape for Low Energy Recoils in Liquid Xenon  

E-Print Network [OSTI]

Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40 keV - 70 keV. Under the assumption of a single dominant decay component to the scintillation pulse-shape the log-normal mean parameter T0 of the maximum likelihood estimator of the decay time constant for 6 keV < Eee < 30 keV nuclear recoil events is equal to 21.0 ns +/- 0.5 ns. It is observed that for electron recoils T0 rises slowly with energy, having a value ~ 30 ns at Eee ~ 15 keV. Electron and nuclear recoil pulse-shapes are found to be well fitted by single exponential functions although some evidence is found for a double exponential form for the nuclear recoil pulse-shape.

Akimov, D Y; Davidge, D; Dawson, J; Howard, A S; Ivaniouchenkov, Yu; Jones, W G; Joshi, M; Kudryavtsev, V A; Lawson, T B; Lebedenko, V; Lehner, M J; Lightfoot, P K; Liubarsky, I; Lüscher, R; McMillan, J E; Peak, C D; Quenby, J J; Spooner, N J C; Sumner, T J; Tovey, Daniel R; Ward, C K

2002-01-01T23:59:59.000Z

250

Stability of the Cyclotron Resonance Scattering Feature in Her X-1 with RXTE  

E-Print Network [OSTI]

Five observations of the hard X-ray spectrum of Her X-1 from \\xte show that the $\\sim 41$ keV energy of the cyclotron scattering line is constant within statistics of a few percent per observtion. Comparison with other observations over many years indicates strongly that the centroid energy of this absorption line has increased some time between 1991 and 1993 by 23%, from 34 keV to 41 keV. Moreover, the cutoff energy of the spectral continuum increased at the same time from 16 keV to 20 keV, which is, within the statistical error of 5%, in direct proportion to the centroid. This may be a sign thatboth these characteristics of the spectrum are controlled in the same way by the magnetic field strength in the region of scattering.

D. E. Gruber; W. A. Heindl; R. E. Rothschild; W. Coburn; R. Staubert; I. Kreykenbohm; J. Wilms

2001-12-19T23:59:59.000Z

251

The high energy X-ray tail of Eta Car revealed by BeppoSAX  

E-Print Network [OSTI]

We report on the June 2000 long (100 ks) BeppoSAX exposure that has unveiled above 10 keV a new very high energy component of the X-ray spectrum of Eta Car extending to at least 50 keV. We find that the 2-150 keV spectrum is best reproduced by a thermal + non-thermal model. The thermal component dominates the 2-10 keV spectral range with kT_h=5.5 +/- 0.3 keV and log NH_h=22.68 +/- 0.01. The spectrum displays a prominent iron emission line centred at 6.70 keV. Its equivalent width of 0.94 keV, if produced by the thermal source, gives a slightly sub-solar iron abundance ([Fe/H]=-0.15 +/- 0.02). The high energy tail above 10 keV is best fitted by a power law with a photon index of 2.42 +/- 0.04. The integrated 13-150 keV luminosity of ~12 L-sun is comparable to that of the 2-10 keV thermal component. The present result can be explained, in the Eta Car binary star scenario, by Comptonisation of low frequency radiation by high energy electrons, probably generated in the colliding wind shock front, or in instabilities in the wind of the S Dor primary star. It is possible that the high energy tail had largely weakened near the minimum of the 5.53 yr cycle. With respect to the thermal component, it probably has a longer recovering time like that of the highest excitation optical emission lines. Both features can be associated with the large absorption measured by BeppoSAX at phase 0.05.

R. F. Viotti; L. A. Antonelli; C. Rossi; S. Rebecchi

2004-02-13T23:59:59.000Z

252

Application of beam emission spectroscopy to NBI plasmas of Heliotron J  

SciTech Connect (OSTI)

This paper describes the application of the beam emission spectroscopy (BES) to Heliotron J, having the nonsymmetrical helical-magnetic-axis configuration. The spectral and spatial profile of the beam emission has been estimated by the numerical calculation taking the collisional excitation processes between plasmas (electrons/ions) and beam atoms. Two sets of the sightlines with good spatial resolution are presented. One is the optimized viewing chords which have 20 sightlines and observe the whole plasma region with the spatial resolution {Delta}{rho} less than {+-}0.055 using the newly designed viewing port. The other is 15 sightlines from the present viewing port of Heliotron J for the preliminary measurement to discuss the feasibility of the density fluctuation measurement by BES. The beam emission has been measured by a monochromator with a CCD camera. A good consistency has been obtained between the spectral profiles of the beam emission measured by the monochromator and the beam emission spectrum deduced by the model calculation. An avalanche photodiode with an interference filter system was also used to evaluate the signal-to-noise (S/N) ratio of the beam emission in the present experimental setup. The modification of the optical system is being planned to improve the S/N ratio, which will enable us to estimate the density fluctuation in Heliotron J.

Kobayashi, S.; Ohshima, S.; Mizuuchi, T.; Nagasaki, K.; Yamamoto, S.; Okada, H.; Minami, T.; Hanatani, K.; Konoshima, S.; Takeuchi, M.; Toushi, K.; Sano, F. [Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011 (Japan); Kado, S. [School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656 (Japan); Oishi, T. [Nagoya University, Chikusa-ku, Nagoya 464-8603 (Japan); Kagawa, T.; Lee, H. Y.; Minami, T.; Nakamura, Y. [Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011 (Japan); Murakami, S. [Graduate School of Engineering, Kyoto University, Kyoto, Kyoto 606-8501 (Japan)

2010-10-15T23:59:59.000Z

253

Note: Deep ultraviolet Raman spectrograph with the laser excitation line down to 177.3 nm and its application  

SciTech Connect (OSTI)

Deep UV Raman spectrograph with the laser excitation line down to 177.3 nm was developed in this laboratory. An ellipsoidal mirror and a dispersed-subtractive triple monochromator were used to collect and disperse Raman light, respectively. The triple monochromator was arranged in a triangular configuration with only six mirrors used. 177.3 nm laser excited Raman spectrum with cut-off wavenumber down to 200 cm{sup ?1} and spectral resolution of 8.0 cm{sup ?1} can be obtained under the condition of high purity N{sub 2} purging. With the C–C ? bond in Teflon selectively excited by the 177.3 nm laser, resonance Raman spectrum of Teflon with good quality was recorded on the home-built instrument and the ?-?{sup *} transition of C–C bond was studied. The result demonstrates that deep UV Raman spectrograph is powerful for studying the systems with electronic transition located in the deep UV region.

Jin, Shaoqing [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China) [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China); University of the Chinese Academy of Sciences, Beijing 100049 (China); Fan, Fengtao; Guo, Meiling; Zhang, Ying; Feng, Zhaochi, E-mail: zcfeng@dicp.ac.cn, E-mail: canli@dicp.ac.cn; Li, Can, E-mail: zcfeng@dicp.ac.cn, E-mail: canli@dicp.ac.cn [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China)] [State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China)

2014-04-15T23:59:59.000Z

254

The contact heat conductance at diamond-OFHC copper interface with GaIn eutectic as a heat transfer medium  

SciTech Connect (OSTI)

Results of an experimental study of the contact heat conductance across a single diamond crystal interface with OFHC copper (Cu) are reported. Gallium-indium (GaIn) eutectic was used as an interstitial material. Contact conductance data are important in the design and the prediction of the performance of x-ray diamond monochromators under high-heat-load conditions. Two sets of experiments were carried out. In one, the copper surface in contact with diamond was polished and then electroless plated with 1 {mu}m of nickel, while in the other, the copper contact surface was left as machined. Measured average interface heat conductances are 44.7 {plus_minus}8 W/cm{sup 2}{minus}K for nonplated copper and 23.0 {plus_minus}3 W/cm{sup 2}{minus}K for nickel-plated copper. For reference, the thermal contact conductances at a copper-copper interface (without diamond) were also measured, and the results are reported. A typical diamond monochromator, 0.2 mm thick, will absorb about 44 W under a standard undulator beam at the Advanced Photon Source. The measured conductance for nickel-plated copper suggests that the temperature drop across the interface of diamond and nickel-plated copper, with a 20 mm{sup 2} contact area, will be about 10{degree}C. Therefore temperature rises are rather modest, and the accuracy of the measured contact conductances presented here are sufficient for design purposes.

Assoufid, L.; Khounsary, A.M.

1996-01-01T23:59:59.000Z

255

Initial laboratory evaluation of color video cameras: Phase 2  

SciTech Connect (OSTI)

Sandia National Laboratories has considerable experience with monochrome video cameras used in alarm assessment video systems. Most of these systems, used for perimeter protection, were designed to classify rather than to identify intruders. The monochrome cameras were selected over color cameras because they have greater sensitivity and resolution. There is a growing interest in the identification function of security video systems for both access control and insider protection. Because color camera technology is rapidly changing and because color information is useful for identification purposes, Sandia National Laboratories has established an on-going program to evaluate the newest color solid-state cameras. Phase One of the Sandia program resulted in the SAND91-2579/1 report titled: Initial Laboratory Evaluation of Color Video Cameras. The report briefly discusses imager chips, color cameras, and monitors, describes the camera selection, details traditional test parameters and procedures, and gives the results reached by evaluating 12 cameras. Here, in Phase Two of the report, we tested 6 additional cameras using traditional methods. In addition, all 18 cameras were tested by newly developed methods. This Phase 2 report details those newly developed test parameters and procedures, and evaluates the results.

Terry, P.L.

1993-07-01T23:59:59.000Z

256

Liste des marchs conclus au cours de l'anne 2007 en application de l'article 133 CMP Arrt du 08/12/2006  

E-Print Network [OSTI]

/12/2006 TITULAIRE CODE POSTAL OBJET LONG MONTANT HT DATE DE NOTIFICATION STOULS 91165 Fourniture de boites en Parc animalier de la Haute-Touche 6 256,4 16/07/2007 EPPENDORF FRANCE 78232 Fourniture d pour le Parc animalier de la Haute-Touche 7 348,5 16/07/2007 MGIE 94410 Fournitures d'équipements et

257

Natural Environment and Landscape Policy and Guidelines  

E-Print Network [OSTI]

(LEED) and Sustainability Tracking, Assessment & Rating System (STARS). LEED is a `Green Building Rating System' that promotes sustainable development and building practices through a number of standardized & furniture 5.14 Walls and fences 5.15 Signage 5.16 Outdoor lighting 5.17 Green roof #12;Dalhousie University

Brownstone, Rob

258

DALHOUSIE UNIVERSITY Natural Environment and Landscape Nov 2013  

E-Print Network [OSTI]

(LEED) and Sustainability Tracking, Assessment & Rating System (STARS). LEED is a `Green Building Rating System' that promotes sustainable development and building practices through a number of standardized & furniture 5.14 Walls and fences 5.15 Signage 5.16 Outdoor lighting 5.17 Green roof #12;Dalhousie University

Brownstone, Rob

259

--No Title--  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

17 67 16 1,040 2,488 769 16.3 26.9 20.4 Heating Equipment (more than one may apply) Heat Pumps ... 4 64 9 339 3,677 542 12.9 17.5 16.8...

260

--No Title--  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

13 45 34 742 2,638 1,695 17.9 17.2 20.1 Heating Equipment (more than one may apply) Heat Pumps ... Q 21 12 Q 1,019 719 Q 20.5 16.3 Packaged...

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Liu UCD Phy9B 07 1 Ch 16. Sound & Hearing  

E-Print Network [OSTI]

Audible range: 20Hz - 20,000Hz Ultrasonic: f > 20,000 Hz, Sonar NOT Supersonic (speed > sound speed/s Please read text on your own. Faster in solids than in liquids and gases #12;Liu UCD Phy9B 07 5 16

Yoo, S. J. Ben

262

Global Stability Analysis of Fluid Flows using Sum-of-Squares  

E-Print Network [OSTI]

Jul 1, 2011 ... The first of these is the classical energy approach of [5, 16], which provides conservative ..... Standard software tools are freely available for posing and solving ... stability limit estimated by direct numerical simulation. ...... make assumptions identical to those in [9, 10] for the purposes of comparison.

2011-07-01T23:59:59.000Z

263

CX-010262: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Smart Grid Functionality; Smart-Grid Ready Photovoltaic Inverter with Utility Communication CX(s) Applied: A9, B3.6, B5.16 Date: 04/26/2013 Location(s): Tennessee Offices(s): Golden Field Office

264

Model-Based Quality Assurance of Automotive Software  

E-Print Network [OSTI]

Model-Based Quality Assurance of Automotive Software Jan Jürjens1 , Daniel Rei�2 , and David, Germany Abstract. Software in embedded (e.g. automotive) systems requires a high level of reliability to the automotive sector, characterized by strict safety requirements to com- ponents of a motor vehicle (see [5, 16

Jurjens, Jan

265

" Million U.S. Housing Units"  

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

"8.",9.7,1.3,3.5,1.8,1.6,1.5 "9 or More",9.1,0.8,2.8,2,1.7,1.9 "At Home Behavior" "Home Used for Business" "Yes",8.9,1.3,3.3,1.7,1.5,1 "No",102.2,28.7,31.5,16.7,14.4,...

266

" Million U.S. Housing Units"  

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

"8.",9.7,8.9,0.5,"Q","N","Q" "9 or More",9.1,8.4,0.4,"Q","Q","Q" "At Home Behavior" "Home Used for Business" "Yes",8.9,7.4,0.4,"Q",0.5,0.4 "No",102.2,64.6,7.2,7.5,16.3,...

267

CX-009703: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Improve the Access Road System in Miles 4, 5, 16, 17, 18, and 30 of the Lower Granite-Hatwai Transmission Line CX(s) Applied: B1.3, B1.13 Date: 12/19/2012 Location(s): Washington, Idaho Offices(s): Bonneville Power Administration

268

--No Title--  

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

641.1 33,642.8 15,272.1 143,862.5 27,919.9 187,054.5 February... 35,222.9 36,233.9 15,798.6 149,861.9 24,339.2 189,999.7 March... 35,675.1 36,724.5 16,210.0...

269

Computation of Stochastic Nash Equilibrium via Variable Sample ...  

E-Print Network [OSTI]

Nov 18, 2013 ... widely studied for stochastic ranking and selection problems [5, 16, ..... algorithm in [3] identified via the “gradient/derivative” being ..... To emphasize the “bucket effect” phenomena, we here intentionally set decision .... From Table 1, we have the following observations: First, the VSDA, with a more frequent.

2013-11-18T23:59:59.000Z

270

CX-009161: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Energy Audit; Efficiency Improvements; and Renewable Energy Installations; Township of Branchburg, NJ CX(s) Applied: B5.1, B5.16, B5.23 Date: 09/14/2012 Location(s): New Jersey Offices(s): Golden Field Office

271

Table HC6.12 Home Electronics Usage Indicators by Number of...  

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

111.1 30.0 34.8 18.4 15.9 12.0 Personal Computers Do Not Use a Personal Computer... 35.5 16.3 9.4 4.0 2.7 3.2 Use a Personal...

272

Exchangeable sodium accumulation and replacement in Southeast Texas soils under turfgrass  

E-Print Network [OSTI]

accumulation but exchangeable Na also increased as a function of years of irrigation. The multiple regression equation: SARE =-5.16 + 0.53 SARiw + 4.04 In (yr) (R2 = 0.86) best predicted SARE to a depth of 30 cm. This study also compared gypsum, a common...

Najjar, Namir Fouad

1995-01-01T23:59:59.000Z

273

CX-008424: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

New York-City-Mount Vernon CX(s) Applied: A1, A9, A11, B3.6, B5.1, B5.16 Date: 06/28/2012 Location(s): New York Offices(s): Energy Efficiency and Renewable Energy

274

436 IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, VOL. 27, NO. 3, MARCH 2008 Quantum Circuit Simplification and  

E-Print Network [OSTI]

in an ad hoc manner [5], [16]. Manuscript received May 14, 2007; revised July 13, 2007 and August 1, 2007 is with the Department of Computer Science, University of Victoria, Victoria, BC V8W 3P6, Canada. Digital Object

Miller, D. Michael

275

Attachment A Version 2.1  

E-Print Network [OSTI]

% minimum coverage. JACKET PVC, color black, nominal thickness: 0.020'' minimum (preferred), 0.040'' max shell. Treatment of the ground sheild: 1. Trim back PVC jacket to position shown in drawing. 2. Trim ground braid and drain wire to be 5/16'' longer than PVC jacket. 3. Fold ground braid and drain wire back

276

OPERATIONAL NOTE GLASS, RUBBER, AND NYLON: HOW TO MAKE A MOUTH ASPIRATOR  

E-Print Network [OSTI]

of flexible polyvinyl chloride (PVC) or rubber tubing, a collection chamber made from glass tubing, and a filter made of nylon stockings or pantyhose (Fig. 1). Rubber or PVC tubing of 8-mm (5/16- in.) external source), and needle-nose pliers. Generally, only a 41-cm (16- in.) section of the PVC tubing is necessary

277

Kernel methods for phenotyping complex plant architecture  

E-Print Network [OSTI]

Kernel methods for phenotyping complex plant architecture Koji KAWAMURA1,2 ,Laurence HIBRAND´e, FRANCE , 2. Department of Environmental Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi architecture is a crit- ical step for understanding the genetic determinism of plant architecture. Previous

Paris-Sud XI, Université de

278

CX-010247: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Energy Efficiency and Conservation Block Grant- Fort Lauderdale, Florida CX(s) Applied: B5.1, B5.16, B5.18, B5.23 Date: 03/14/2013 Location(s): Florida Offices(s): Golden Field Office

279

Cubane, Cuneane, and Their Carboxylates: A Calorimetric, Crystallographic, Calculational, and Conceptual Coinvestigation  

E-Print Network [OSTI]

Henares, Spain, Department of Chemistry & Biochemistry, University of Missouri St. Louis, 8001 Natural Bridge Road, St Louis, Missouri 63121-4499, Department of Chemistry & Biochemistry, University, fH°m(cr)/kJ,mol-1 ) -232.62 ( 5.84 and -413.02 ( 5.16, respectively. The enthalpies of sublimation

Chickos, James S.

280

Center for Multimedia Signal Processing CELP Encoders  

E-Print Network [OSTI]

-------------------------------------- lsp 1 1-3 lsp 6 20-22 lsp 2 4-7 lsp 7 23-25 lsp 3 8-11 lsp 8 26-28 lsp 4 12-15 lsp 9 29-31 lsp 5 16

Mak, Man-Wai

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Center for Multimedia Signal Processing CELP Decoder  

E-Print Network [OSTI]

-------------------------------------- lsp 1 1-3 lsp 6 20-22 lsp 2 4-7 lsp 7 23-25 lsp 3 8-11 lsp 8 26-28 lsp 4 12-15 lsp 9 29-31 lsp 5 16

Mak, Man-Wai

282

Utilization and Fairness in Spectrum Assignment for Opportunistic Spectrum Access  

E-Print Network [OSTI]

. INTRODUCTION Wireless devices are becoming ubiquitous, placing increas- ing stress on the fixed radio spectrum by software defined radio (SDR) technology [5], [16], [24], Open Spectrum allows unlicensed (secondary) users1 Utilization and Fairness in Spectrum Assignment for Opportunistic Spectrum Access Chunyi Peng

Almeroth, Kevin C.

283

CX-007371: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Massachusetts-TRIBE-MASHPEE WAMPANOAG TRIBAL COUNCIL INC. CX(s) Applied: B2.5, A9, B5.1, B5.16 Date: 11/22/2011 Location(s): Massachusetts Offices(s): Energy Efficiency and Renewable Energy

284

" Million Housing Units, Final...  

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

"Do Not Use a Refrigerator",0.2,"Q","N","N","N","Q","Q","N","N" "Through-the-Door Ice" "and Water Service" "Yes",38,4.3,1,0.4,0.6,3.3,1.2,1.3,0.8 "No",75.5,16.4,4.5,2,2.4,11...

285

At what age can children reliably and validly self-report their health-related quality of life? An investigation using the PedsQL(tm) 4.0 Generic Core Scales Database  

E-Print Network [OSTI]

of the PedsQL™ 4.0 Generic Core Scales were examined using child self-report and parent proxy-report age subgroup data on over 8,000 children ages 5-16 years from the PedsQL 4.0 Generic Core Scales DatabaseSM. The PedsQL™ 4.0 Generic Core Scales demonstrated...

Limbers, Christine A.

2009-05-15T23:59:59.000Z

286

Microsoft Word - appa.docx  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

21,741.6 17,106.2 15,008.9 12,830.3 11,656.1 12,522.5 16,569.7 -0.1% International electricity trade Imports from Canada and Mexico Firm power ......

287

The Proceedings of the 2008 International Conference on Mobile Data Xiaofeng Meng Hui Lei Stephane Grumbach Hong Va Leong  

E-Print Network [OSTI]

. 12. ,,. Deep Web . , 31(8): 1412-142120088. 13. ,,,: XML Twig . 45 ()354-359, 2008.10(, ) 14 . , 45 ()37-42, 2008.10. (, ) 17. TEXEM . 45 ()269-274, 2008.10 1 Deep Web Key Techniques on Deep Web Data Integration2008.5.16 2 Deep Web Study on Query Results Processing of Deep Web Data

288

One-And-A-Half-Centered Expansion Method in Charge-Transfer Calculations of Proton-Hydrogen Scattering  

E-Print Network [OSTI]

by Wilets and Gallaher. The discrepancy may be attributed to the inaccuracy in numerical calcula- tion. These two-centered expansions (TCE) consume much computing time. Reading, Ford, and Becker [23?25] have invented a set of one... ranges have been extended from 100 keV in previous work to 250 keV. The charge-transfer cross sections to the 2p state fit the experimental data at 30 keV and are almost the same as those calculated using TCE method by Cheshire and Shakeshaft...

Chen, Z. F.; Reading, John F.

1993-01-01T23:59:59.000Z

289

New astrophysical S factor for the (15)N(p,gamma)(16)O reaction via the asymptotic normalization coefficient (ANC) method  

E-Print Network [OSTI]

reaction have been reported by Rolfs and Rodney [1] down to proton energies of Ep #1; 155 keV and earlier by Hebbard [2] for proton energies down to Ep #1; 220 keV. These measurements disagree at energies below 300 keV by up to a factor of 2. To fit... their low-energy data to obtain an astrophysical S factor, Rolfs and Rodney included the interference of the two 1? resonant capture amplitudes with the nonresonant (direct) component to the ground state of 16O. The direct capture term plays an important...

Mukhamedzhanov, A. M.; Bem, P.; Burjan, V.; Gagliardi, Carl A.; Goldberg, V. Z.; Hons, Z.; La Cognata, M.; Kroha, V.; Mrazek, J.; Novak, J.; Piskor, S.; Pizzone, R. G.; Plunkett, A.; Romano, S.; Simeckova, E.; Spitaleri, C.; Trache, L.; Tribble, Robert E.; Vesely, F.; Vincour, J.

2008-01-01T23:59:59.000Z

290

Double-{beta} decay Q value of {sup 150}Nd  

SciTech Connect (OSTI)

The double-{beta} decay Q value of {sup 150}Nd was determined by using the JYFLTRAP Penning trap mass spectrometer. The measured mass difference between {sup 150}Nd and {sup 150}Sm is 3371.38(20) keV. This new value deviates by 3.7 keV from the previously adopted value of 3367.7(22) keV and is a factor of 10 more precise. Accurate knowledge of this Q value is important because {sup 150}Nd is a primary candidate to be used in the search for neutrinoless double-{beta} decay modes in several experiments.

Kolhinen, V. S.; Eronen, T.; Gorelov, D.; Hakala, J.; Jokinen, A.; Kankainen, A.; Moore, I. D.; Rissanen, J.; Saastamoinen, A.; Suhonen, J.; Aeystoe, J. [Department of Physics, P. O. Box 35 (YFL), FI-40014 University of Jyvaeskylae (Finland)

2010-08-15T23:59:59.000Z

291

Medium energy ion implantation of Germanium into heated Silicon  

E-Print Network [OSTI]

flange arranged in a standard Einsel lens arrangement and a set of 13 ++12 ~6 L, 1 - Source 2 - Acceleration Column 3. - Glass Cross and 6" Diffusion 4 - Separation Magnet 5 - Gate Valve 6 - Quadrupole 7 - Rear Collimator 8 - Deflection Plates... Analysis of a, 40 keV, SXIO" ions cm' Ge Implant into 420'C FZ &111& Si. 29 300 keV He RBS analysis of two, 60 keV, 3X10" ions cm' Ge implants, rastered and unrastered, into 300'C FZ &111& Si. 30 LIST OF TABLES Table Page Cntical thickness of a Ge...

McCoy, John Curtis

1993-01-01T23:59:59.000Z

292

Low-lying levels in F-15 and the shell model potential for drip-line nuclei  

E-Print Network [OSTI]

and DE detec- tors. Using the TOF-DE analysis, it was possible to identify the low energy protons, which stopped in the DE detectors. In addition to the CH4 gas, data were obtained with CO2 gas, to subtract background events from interactions... peak of a few hundred keV width at 2.8 MeV. The experimental resolution in the region of 2.8 MeV peak was about 25 keV (the main contributions are the size of the beam spot; beam angular and energy spread, 18 keV; and straggling in the gas, 14 ke...

Goldberg, VZ; Chubarian, GG; Tabacaru, G.; Trache, L.; Tribble, Robert E.; Aprahamian, A.; Rogachev, GV; Skorodumov, BB; Tang, XD.

2004-01-01T23:59:59.000Z

293

accelerated 56fe ions: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

an H- beam at 30 keV. The plasma generator of the ion source is of an axially cusped bucket type, and the whole inner wall, except the cathode filaments and plasma electrode...

294

accelerated ions distribution: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

an H- beam at 30 keV. The plasma generator of the ion source is of an axially cusped bucket type, and the whole inner wall, except the cathode filaments and plasma electrode...

295

accelerated iron ions: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

an H- beam at 30 keV. The plasma generator of the ion source is of an axially cusped bucket type, and the whole inner wall, except the cathode filaments and plasma electrode...

296

astrophysical s170 factor: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

is predicted to be 10.1 10-20 keV b, a factor of five larger than the standard-solar-model value. The P-wave transitions are found to be important, contributing about 40 %...

297

airless planetary bodies: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of space plasma near planetary bodies. Hear we provide a short review of recent low-energy ENA observations (up to 1 keV) near Mars, Venus and the Moon. Futaana, Yoshifumi...

298

Inner-Shell Excitation Spectroscopy of Fused-Ring Aromatic Molecules by Electron Energy Loss and X-ray Raman Techniques  

E-Print Network [OSTI]

recorded under scattering conditions where electric dipole transitions dominate (2.5 keV residual energy aromatics in bulk samples that are opaque to soft X-rays, such as coals and heavy hydrocarbon deposits. 1

Hitchcock, Adam P.

299

Depth profiling studies of multilayer films with a C60 A.G. Sostarecza,*  

E-Print Network [OSTI]

0) at a C60 þ beam energy of 20 keV. The neutral atom yield was monitored via laser postionization Materials Research Institute Building, University Park, PA 16802, USA b Physics Department, University

Wucher, Andreas

300

Determination of Mass Attenuation Coefficients for CuInSe2 and CuGaSe2 Semiconductors  

SciTech Connect (OSTI)

This work presents mass attenuation coefficients values of CuInSe2 and CuGaSe2 semiconductor thin films commonly used in photovoltaic devices. The mass attenuation coefficients were measured at different energies from 11.9 to 37.3 keV by using the secondary excitation method. Monochromatic photons were obtained using the Br, Sr, Mo, Cd, Te, Ba and Nd secondary targets. 59.5 keV gamma rays emitted from an annular Am-241 radioactive source were used to excite secondary targets. Characteristic X-rays emitted from secondary target were counted by a Si(Li) detector with a resolution of 0.16 keV at 5.9 keV. The measured values were compared with theoretical values calculated using WinXCOM program.

Celik, Ahmet; Cevik, Ugur; Baltas, Hasan; Bacaksiz, Emin [Department of Physics, Faculty of Arts and Sciences, Karadeniz Technical University, 61080 Trabzon (Turkey)

2007-04-23T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

PHYSICAL REVIEW C 75, 044305 (2007) Global study of the spectroscopic properties of the first 2+  

E-Print Network [OSTI]

more than 2 orders of magnitude, ranging below 100 keV in deformed actinide nuclei to a few Me be used for the entire chart of nuclei. The Skyrme family of functionals that is used in the present study

Bertsch George F.

302

Srgio L. Morelho & Andrea Antunes Instituto de Fsica, USP  

E-Print Network [OSTI]

) Physiological changes Causes: aging, drugs, diabetes, congenital, ... #12;Optical/Electron Microscopy Visible of entire lenses (@ 20 KeV) Air Healthy Cataractous Water Med. Phys. 33, 2338 (2006) #12;Discovery

Morelhão, Sérgio Luiz

303

Molecular Dynamics Simulation of Damage Cascade Formation in Ion Bombarded Solids  

E-Print Network [OSTI]

/Molecular Massively Parallel Simulator). In one subtask, we studied damage cascade interactions caused by two 2 keV Si atoms simultaneously bombarding a crystalline Si substrate. We found that the enhanced displacement creation appears primarily in the thermal spike...

Chen, Di

2012-10-19T23:59:59.000Z

304

Clues to the origin of metal in Almahata Sitta EL and EH chondrites...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

microanalyzer (EPMA) at the ICEM operated at 15 keV, a probe current of 15 nA, and 1 lm beam size. For metal analyses (Table 1), pure Astimex metal standards (Fe, Ni, Si, Co),...

305

Qualification of a high-efficiency, gated spectrometer for x-ray Thomson scattering on the National Ignition Facility  

SciTech Connect (OSTI)

We have designed, built, and successfully fielded a highly efficient and gated Bragg crystal spectrometer for x-ray Thomson scattering measurements on the National Ignition Facility (NIF). It utilizes a cylindrically curved Highly Oriented Pyrolytic Graphite crystal. Its spectral range of 7.4–10?keV is optimized for scattering experiments using a Zn He-? x-ray probe at 9.0 keV or Mo K-shell line emission around 18 keV in second diffraction order. The spectrometer has been designed as a diagnostic instrument manipulator-based instrument for the NIF target chamber at the Lawrence Livermore National Laboratory, USA. Here, we report on details of the spectrometer snout, its novel debris shield configuration and an in situ spectral calibration experiment with a Brass foil target, which demonstrated a spectral resolution of E/?E = 220 at 9.8 keV.

Döppner, T.; Kritcher, A. L.; Bachmann, B.; Burns, S.; Hawreliak, J.; House, A.; Landen, O. L.; LePape, S.; Ma, T.; Pak, A.; Swift, D. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Neumayer, P. [Gesellschaft für Schwerionenphysik, 64291 Darmstadt (Germany); Kraus, D. [University of California, Berkeley, California 94720 (United States); Falcone, R. W. [University of California, Berkeley, California 94720 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Glenzer, S. H. [SLAC National Accelerator Laboratory, Menlo Park, California 94309 (United States)

2014-11-15T23:59:59.000Z

306

age positive correlation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the energy of the cyclotron line increases as the luminosity increases. The X-ray flux measured by the RXTEASM (2-10 keV) has been assumed to represent the luminosity - more...

307

E-Print Network 3.0 - arcminute angular resolution Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

demands on its attitude control system (ACS... ) is a balloon-borne, hard x-raygamma ray (20-70 keV) astronomical experiment. HEFT's 10 arcminute field of view... Recent...

308

alpha-gamma pulse shape: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Alpha, Gamma and Nuclear Recoil Pulses from NaI(Tl) at 10-100 keV Relevant to Dark Matter Searches HEP - Experiment (arXiv) Summary: Measurements of the shapes of scintillation...

309

Real-time RBS analysis of plasma erosion in DIONISOS  

E-Print Network [OSTI]

One of the primary scientific challenges still facing the development of commercial nuclear fusion reactors lies at the plasma-material boundary. Plasma temperatures greater than 10 million degrees Celsius (10 keV) require ...

Peterson, Ethan E. (Ethan Eric)

2013-01-01T23:59:59.000Z

310

E-Print Network 3.0 - axisymmetric electron beam Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

. Factors controlling the plasma electron temperature when heated by 18-20keV neutral beams with a power... from periphery, electron temperatures of 150-160eV were obtained with...

311

Opacity and gradients in aluminum wire array z-pinch implosions on the Z pulsed power facility  

SciTech Connect (OSTI)

Aluminum wire array z pinches imploded on the Z generator are an extremely bright source of 1–2?keV radiation, with close to 400?kJ radiated at photon energies >1?keV and more than 50?kJ radiated in a single line (Al Ly-?). Opacity plays a critical role in the dynamics and K-shell radiation efficiency of these pinches. Where significant structure is present in the stagnated pinch this acts to reduce the effective opacity of the system as demonstrated by direct analysis of spectra. Analysis of time-integrated broadband spectra (0.8–25?keV) indicates electron temperatures ranging from a few 100?eV to a few keV are present, indicative of substantial temperature gradients.

Ampleford, D. J., E-mail: damplef@sandia.gov; Hansen, S. B.; Jennings, C. A.; Jones, B.; Coverdale, C. A.; Harvey-Thompson, A. J.; Rochau, G. A.; Dunham, G.; Moore, N. W.; Harding, E. C.; Cuneo, M. E. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)] [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States); Chong, Y.-K.; Clark, R. W.; Ouart, N.; Thornhill, J. W.; Giuliani, J.; Apruzese, J. P. [Naval Research Laboratory, Washington, DC 20375 (United States)] [Naval Research Laboratory, Washington, DC 20375 (United States)

2014-03-15T23:59:59.000Z

312

Two-photon decay of light scalars: a comparison of tetraquark and quarkonium assignments  

E-Print Network [OSTI]

Two-photon decays of light scalar mesons are discussed within the quarkonium and tetraquark asignements: in both cases the decay rate of the sigma resonances turns out to be smaller than 1 keV.

Francesco Giacosa

2009-03-31T23:59:59.000Z

313

E-Print Network 3.0 - auger-photoelectron coincidence spectroscopy...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

de tmnsfl.rement de... spectruni from C I K-elect.rons has been measured using 59.54 keV radiation and coincidence ... Source: Ecole Polytechnique, Centre de mathmatiques...

314

Measurement of J/psi leptonic width with the KEDR detector  

E-Print Network [OSTI]

We report a new precise determination of the leptonic widths of the J/psi meson performed with the KEDR detector at the VEPP-4M $e^{+}e^{-}$ collider. The measured values of the J/psi parameters are: \\Gamma_{ee}\\times\\Gamma_{ee}/\\Gamma = 0.3323 \\pm 0.0064 (stat.) \\pm 0.0048 (syst.) keV \\Gamma_{ee}\\times\\Gamma_{\\mu\\mu}/\\Gamma=0.3318 \\pm 0.0052 (stat.) \\pm 0.0063 (syst.) keV. Assuming $e\\mu$ universality and using the table value of the branching ratios the leptonic \\Gamma_{ll}= 5.59 \\pm 0.12 keV width and the total \\Gamma=94.1 \\pm 2.7 keV widths were obtained. We also discuss in detail a method to calculate radiative corrections at a narrow resonance.

Anashin, V V; Baldin, E M; Barladyan, A K; Barnyakov, A Yu; Barnyakov, M Yu; Baru, S E; Basok, I Yu; Beloborodova, O L; Blinov, A E; Blinov, V E; Bobrov, A V; Bobrovnikov, V S; Bogomyagkov, A V; Bondar, A E; Buzykaev, A R; Eidelman, S I; Grigoriev, D N; Glukhovchenko, Yu M; Gulevich, V V; Gusev, D V; Karnaev, S E; Karpov, G V; Karpov, S V; Kharlamova, T A; Kiselev, V A; Kolmogorov, V V; Kononov, S A; Kotov, K Yu; Kravchenko, E A; Kudryavtsev, V N; Kulikov, V F; Kurkin, G Ya; Kuper, E A; Levichev, E B; Maksimov, D A; Malyshev, V M; Maslennikov, A L; Medvedko, A S; Meshkov, O I; Mishnev, S I; Morozov, I I; Muchnoi, N Yu; Neufeld, V V; Nikitin, S A; Nikolaev, I B; Okunev, I N; Onuchin, A P; Oreshkin, S B; Orlov, I O; Osipov, A A; Peleganchuk, S V; Pivovarov, S G; Piminov, P A; Petrov, V V; Poluektov, A O; Prisekin, V G; Ruban, A A; Sandyrev, V K; Savinov, G A; Shamov, A G; Shatilov, D N; Shwartz, B A; Simonov, E A; Sinyatkin, S V; Skrinsky, A N; Smaluk, V V; Sokolov, A V; Sukharev, A M; Starostina, E V; Talyshev, A A; Tayursky, V A; Telnov, V I; Tikhonov, Yu A; Todyshev, K Yu; Tumaikin, G M; Usov, Yu V; Vorobiov, A I; Yushkov, A N; Zhilich, V N; Zhulanov, V V; Zhuravlev, A N

2011-01-01T23:59:59.000Z

315

Measurement of \\Gamma_{ee}(J/\\psi)*Br(J/\\psi->e^+e^-) and \\Gamma_{ee}(J/\\psi)*Br(J/\\psi->\\mu^+\\mu^-)  

E-Print Network [OSTI]

The products of the electron width of the J/\\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \\Gamma_{ee}(J/\\psi)*Br(J/\\psi->e^+e^-)=0.3323\\pm0.0064\\pm0.0048 keV, \\Gamma_{ee}(J/\\psi)*Br(J/\\psi->\\mu^+\\mu^-)=0.3318\\pm0.0052\\pm0.0063 keV. Assuming e\\mu universality and using the world average value of the lepton branching fraction, we also determine the leptonic \\Gamma_{ll}=5.59\\pm0.12 keV and total \\Gamma=94.1\\pm2.7 keV widths of the J/\\psi meson.

Anashin, V V; Baldin, E M; Barladyan, A K; Barnyakov, A Yu; Barnyakov, M Yu; Baru, S E; Bedny, I V; Beloborodova, O L; Blinov, A E; Blinov, V E; Bobrov, A V; Bobrovnikov, V S; Bogomyagkov, A V; Bondar, A E; Bondarev, D V; Buzykaev, A R; Eidelman, S I; Glukhovchenko, Yu M; Gulevich, V V; Gusev, D V; Karnaev, S E; Karpov, G V; Karpov, S V; Kharlamova, T A; Kiselev, V A; Kononov, S A; Kotov, K Yu; Kravchenko, E A; Kulikov, V F; Kurkin, G Ya; Kuper, E A; Levichev, E B; Maksimov, D A; Malyshev, V M; Maslennikov, A L; Medvedko, A S; Meshkov, O I; Mishnev, S I; Morozov, I I; Muchnoi, N Yu; Neufeld, V V; Nikitin, S A; Nikolaev, I B; Okunev, I N; Onuchin, A P; Oreshkin, S B; Orlov, I O; Osipov, A A; Peleganchuk, S V; Pivovarov, S G; Piminov, P A; Petrov, V V; Poluektov, A O; Popkov, I N; Prisekin, V G; Ruban, A A; Sandyrev, V K; Savinov, G A; Shamov, A G; Shatilov, D N; Shwartz, B A; Simonov, E A; Sinyatkin, S V; Skovpen, Yu I; Skrinsky, A N; Smaluk, V V; Sokolov, A V; Sukharev, A M; Starostina, E V; Talyshev, A A; Tayursky, V A; Telnov, V I; Tikhonov, Yu A; Todyshev, K Yu; Tumaikin, G M; Usov, Yu V; Vorobiov, A I; Yushkov, A N; Zhilich, V N; Zhulanov, V V; Zhuravlev, A N

2009-01-01T23:59:59.000Z

316

E-Print Network 3.0 - andromeda galaxy m31 Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

keV band... populations of M31 and the Galactic bulge. Andromeda is a coded aperture gamma-ray telescope consisting... and coverage to detect such a ... Source: Prince, Thomas A....

317

authentication ldrd project: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Development of Superconducting Accelerator Magnets Capable of High dBdt A. Ghosh SUPERCONDUCT MAGNET DIV902A 01-11 Combination of Magnetic Fields and 20 keV Synchrotron X-rays...

318

E-Print Network 3.0 - aluminium ions implanted Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Probe 111 InCd as molecular 111 InO- Ions for Materials Studies... University, ACT 0200, Australia A low energy (50-150 keV) negative ion implanter at the University of...

319

I. Nuclear Production Reaction and Chemical Isolation Procedure for 240Am II. New Superheavy Element Isotopes: 242Pu(48Ca,5n)285-114  

E-Print Network [OSTI]

the low excitation energy of the nuclear reaction results inof nuclear fusion reactions at low excitation energies withlow (1 eV – 100 keV) neutron energies. It goes on to discuss the nuclear reactions

Ellison, Paul Andrew

2011-01-01T23:59:59.000Z

320

abundance range revealed: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

while the hotter component has a temperature (1.5 keV) characteristic of the virial temperature of a 1013 Msun halo. The two-phase model (and other multitemperature models)...

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

E-Print Network 3.0 - arc ion implantation Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

des paramittres d'implantation (18-39 kev, 10'-10'ionscm2) et de re- cuit (950-1100pour 10... -duration incoherent xenon light exposure has been used to re- move the ion...

322

Alcator C-Mod: The little tokamak that could Steven Scott,PPPL  

E-Print Network [OSTI]

to ITER. #12;Fusing plasma blanket superconducting magnets turbine & generator heat exchanger density: n = 1020 m3 temperature: T = 10 keV = 100,000,000 C energy `confinement time' E = 3 sec material

323

The BMW Detection Algorithm applied to the Chandra Deep Field south: deeper and deeper  

E-Print Network [OSTI]

Chandra deep fields represent the deepest look at the X-ray sky. We analyzed the Chandra Deep Field South (CDFS) with the aid of a dedicated wavelet-based algorithm. Here we present a detailed description of the procedures used to analyze this field, tested and verified by means of extensive simulations. We show that we can safely reconstruct the LogN-Log S source distribution of the CDFS down to limiting fluxes of 2.4x10^-17 and 2.1x10^-16 erg s^-1 cm^-2 in the soft (0.5-2 keV) and hard (2-10 keV) bands, respectively, fainter by a factor ~ 2 than current estimates. At these levels we can account for ~ 90% of the 1-2 keV and 2-10 keV X-ray background.

A. Moretti; D. Lazzati; S. Campana; G. Tagliaferri

2002-01-17T23:59:59.000Z

324

The BMW Detection Algorithm applied to the Chandra Deep Field south deeper and deeper  

E-Print Network [OSTI]

Chandra deep fields represent the deepest look at the X-ray sky. We analyzed the Chandra Deep Field South (CDFS) with the aid of a dedicated wavelet-based algorithm. Here we present a detailed description of the procedures used to analyze this field, tested and verified by means of extensive simulations. We show that we can safely reconstruct the LogN-Log S source distribution of the CDFS down to limiting fluxes of 2.4x10^-17 and 2.1x10^-16 erg s^-1 cm^-2 in the soft (0.5-2 keV) and hard (2-10 keV) bands, respectively, fainter by a factor ~ 2 than current estimates. At these levels we can account for ~ 90% of the 1-2 keV and 2-10 keV X-ray background.

Moretti, A; Campana, S; Tagliaferri, G

2002-01-01T23:59:59.000Z

325

Relative Response to Low-Energy Photons and Determination of Instrument Correction Factors for Portable Radiation Instrumentation  

E-Print Network [OSTI]

keV for the Eberline Teletector 6112B low and high-range detectors, respectively. A correction factor of 0.8 should be applied for photons below 120 keV for the Eberline RO-7-BM. For the Thermo Mk2 EPD, a correction factor of 1.25 should... energy model (left). Side view with the aluminum case removed (right).................................................................. 15 6 Front view of a Thermo MK2 electronic personal dosimeter (left). Disassembled view; the compensating...

Wagoner, David Andrew

2011-10-21T23:59:59.000Z

326

Astrophysical S factors of radiative {sup 3}He{sup 4}He, {sup 3}H{sup 4}He, and {sup 2}H{sup 4}He capture  

SciTech Connect (OSTI)

The possibility of describing the astrophysical S factors for radiative {sup 3}He{sup 4}He capture at energies of up to 15 keV and radiative {sup 3}H{sup 4}He and {sup 2}H{sup 4}He capture at energies of up 5 keV is considered on the basis of the potential cluster model involving forbidden states.

Dubovichenko, S. B., E-mail: sergey@dubovichenko.r [National Academy of Sciences of the Republic of Kazakstan, Fesenkov Astrophysical Institute (Kazakhstan)

2010-09-15T23:59:59.000Z

327

A&A 472, 261268 (2007) DOI: 10.1051/0004-6361:20077643  

E-Print Network [OSTI]

V, mostly thermal) and the hard (20­40 and 60­80 keV, mostly non- thermal) X-ray emission in solar flares up the data from the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) spacecraft, a NASA Small) and broad energy coverage (3 keV­20 MeV), which makes it well suited to distinguish the thermal from non-thermal

Micela, Giusi

2007-01-01T23:59:59.000Z

328

Qtac Product PresentationQtac Product PresentationQtac Product PresentationQtac Product Presentation ION-TOF GmbH  

E-Print Network [OSTI]

Presentation ION-TOF GmbH Heisenbergstr. 15 D-48149 Münster / Germany www.iontof.com Sven Kayser Sales Atomic Layer Ne+ @ 3 keV Intensity Ne+ @ 3 keV 192 Ir 55 Mn 0 1000 2000 3000 Energy (eV) Intensity 103 Rh(a.u.) energy (eV) #12;Principle of the ToF Mass Filter Different flight times for ions with different masses

Gilchrist, James F.

329

Production and application of a novel energy-tunable X-ray source at the RPI LINAC  

E-Print Network [OSTI]

Production and application of a novel energy-tunable X-ray source at the RPI LINAC Bryndol Sones energy linewidth for example, Si(400) FWHM of 134 eV at 9.0 keV (2%). Per electron, the photon production 17­20 keV. Low Z materials like graphite and LiF were most suitable for PXR production because

Danon, Yaron

330

High effective atomic number polymer scintillators for gamma ray spectroscopy  

DOE Patents [OSTI]

A scintillator material according to one embodiment includes a bismuth-loaded aromatic polymer having an energy resolution at 662 keV of less than about 10%. A scintillator material according to another embodiment includes a bismuth-loaded aromatic polymer having a fluor incorporated therewith and an energy resolution at 662 keV of less than about 10%. Additional systems and methods are also presented.

Cherepy, Nerine Jane; Sanner, Robert Dean; Payne, Stephen Anthony; Rupert, Benjamin Lee; Sturm, Benjamin Walter

2014-04-15T23:59:59.000Z

331

Coded aperture imaging system optimized for hard x-ray and gamma ray astronomy  

SciTech Connect (OSTI)

A coded aperture imaging system has been designed for the Gamma-Ray Imaging Spectrometer (GRIS). The system is optimized for imaging 511-keV positron-annihilation photons. For a galactic center 511-keV source strength of 10/sup -3/ cm/sup -2/s/sup -1/, the source location accuracy is expected to be +-0.2/sup 0/.

Gehrels, N.; Cline, T.L.; Huters, A.F.; Leventhal, M.; MacCallum, C.J.; Reber, J.D.; Stang, P.D.; Teegarden, B.J.; Tueller, J.

1985-01-01T23:59:59.000Z

332

Low energy tracking and particles identification in the MUNU Time Projection Chamber at 1 bar. Possible application in low energy solar neutrino spectroscopy  

E-Print Network [OSTI]

In this paper we present the results from the measurements made with the MUNU TPC at 1bar pressure of CF4 in the energy region below 1 MeV. Electron events down to 80 keV are successfully measured. The electron energy and direction are reconstructed for every contained single electron above 200 keV. As test the 137Cs photopeak is reconstructed by measuring both the energy and direction of the Compton electrons in the TPC.

Z. Daraktchieva; C. Amsler; M. Avenier; C. Broggini; J. Busto; C. Cerna; F. Juget; D. H. Koang; J. Lamblin; D. Lebrun; O. Link; G. Puglierin; A. Stutz; A. Tadsen; J. -L. Vuilleumier; J. -M. Vuilleumier; V. Zacek

2007-11-02T23:59:59.000Z

333

ON THE AFTERGLOW OF THE X-RAY FLASH OF 2003 JULY 23: PHOTOMETRIC EVIDENCE FOR AN OFF-AXIS GAMMA-RAY BURST WITH AN ASSOCIATED SUPERNOVA?1  

E-Print Network [OSTI]

to the light curve for long-duration gamma-ray bursts (GRBs), i.e., a broken power law with a late time slope -- gamma rays: bursts -- supernovae: general -- X-rays: individual (XRF 030723) 1. INTRODUCTION X-ray (covering 2­25 keV) that did not trigger the Gamma Ray Burst Monitor (covering 40­700 keV). Beppo

Greiner, Jochen

334

Calibration of the GLAST Burst Monitor Detectors  

SciTech Connect (OSTI)

The GLAST Burst Monitor (GBM) will augment the capabilities of GLAST for the detection of cosmic gamma-ray bursts by extending the energy range (20 MeV to > 300 GeV) of the Large Area Telescope (LAT) towards lower energies by 2 BGO-detectors (150 keV to 30 MeV) and 12 NaI(Tl) detectors (10 keV to 1 MeV). The physical detector response of the GBM instrument for GRBs is determined with the help of Monte Carlo simulations, which are supported and verified by on-ground calibration measurements, performed extensively with the individual detectors at the MPE in 2005. All flight and spare detectors were irradiated with calibrated radioactive sources in the laboratory (from 14 keV to 4.43 MeV). The energy/channel-relations, the dependences of energy resolution and effective areas on the energy and the angular responses were measured. Due to the low number of emission lines of radioactive sources below 100 keV, calibration measurements in the energy range from 10 keV to 60 keV were performed with the X-ray radiometry working group of the Physikalisch-Technische Bundesanstalt (PTB) at the BESSY synchrotron radiation facility, Berlin.

von Kienlin, Andreas; Bissaldi, Elisabetta; Lichti, Giselher G.; Steinle, Helmut; Krumrey, Michael; Gerlach, Martin; Fishman, Gerald J.; Meegan, Charles; Bhat, Narayana; Briggs, Michael S.; Diehl, Roland; Connaughton, Valerie; Greiner, Jochen; Kippen, R.Marc; Kouveliotou, Chryssa; Paciesas, William; Preece, Robert; Wilson-Hodge, Colleen

2011-11-29T23:59:59.000Z

335

DISPLACEMENT CASCADE SIMULATION IN TUNGSTEN AT 1025 K  

SciTech Connect (OSTI)

Molecular dynamics simulation was employed to investigate the irradiation damage properties of bulk tungsten at 1025 K (0.25 melting temperature). A comprehensive data set of primary cascade damage was generated up to primary knock-on atom (PKA) energies 100 keV. The dependence of the number of surviving Frenkel pairs (NFP) on the PKA energy (E) exhibits three different characteristic domains presumably related to the different cascade morphologies that form. The low-energy regime < 0.2 keV is characterized by a hit-or-miss type of Frenkel pair (FP) production near the displacement threshold energy of 128 eV. The middle regime 0.3 – 30 keV exhibits a sublinear dependence of log(NFP) vs log(E) associated with compact cascade morphology with a slope of 0.73. Above 30 keV, the cascade morphology consists of complex branches or interconnected damage regions. In this extended morphology, large interstitial clusters form from superposition of interstitials from nearby damage regions. Strong clustering above 30 keV results in a superlinear dependence of log(NFP) vs log(E) with a slope of 1.365. At 100 keV, an interstitial cluster of size 92 and a vacancy cluster of size 114 were observed.

Setyawan, Wahyu; Nandipati, Giridhar; Roche, Kenneth J.; Heinisch, Howard L.; Kurtz, Richard J.; Wirth, Brian D.

2013-09-30T23:59:59.000Z

336

Determination of the 242Pu Branching Ratio via Alpha-Gamma Coincidence  

SciTech Connect (OSTI)

When the burn-up is high, the {sup 242}Pu isotopic content becomes more important. The traditional correlation method will fail. The {sup 242}Pu isotopic content in the sample plays an essential role if the neutron coincidence method is used to quantify the total amount of plutonium. In one of the earlier measurements we had a chance to measure an isotopic pure (> 99.95 %) {sup 242}Pu thick sample and realized that the difference in the branching ratio (BR) value among current nuclear data3) for the two important gamma-rays at 103.5-keV and 158.8-keV. In this study, the thick sample was counted on a 15% ORTEC safeguards type HPGe to further improve BR determination of the 159-keV gamma-ray. Furthermore, we have made a thin {sup 242}Pu sample from the thick sample and performed alpha-gamma coincidence measurements. Our preliminary gamma-ray BR results are 4.37(6) E-4, 2.79(8) E-5, and 2.25(8) E-6 for 44.9-keV, 103.5-keV, and 158.9-keV, respectively.

Wang, T F

2012-05-24T23:59:59.000Z

337

Synchrotron studies of narrow band materials  

SciTech Connect (OSTI)

Since last year, we have had three 3-week blocks of beamtime, in April and November 1991 and February 1992, on the Ames/Montana beamline at the Wisconsin Synchrotron Radiation Center (SRC). These runs continued our program on high temperature superconductors, heavy Fermion and related uranium and rare earth materials, and started some work on transition metal oxides. We have also had beamtime at the Brookhaven NSLS, 5 days of beamtime on the Dragon monochromator, beamline U4B, studying resonant photoemission of transition metal oxides using photon energies around the transition metal 2p edges. Data from past runs has been analyzed, and in some cases combined with photoemission and bremsstrahlung isochromat spectroscopy (BIS) data taken in the home U-M lab. 1 fig.

Not Available

1992-01-01T23:59:59.000Z

338

Synchrotron studies of narrow band materials. Progress report, July 1, 1991--June 30, 1992  

SciTech Connect (OSTI)

Since last year, we have had three 3-week blocks of beamtime, in April and November 1991 and February 1992, on the Ames/Montana beamline at the Wisconsin Synchrotron Radiation Center (SRC). These runs continued our program on high temperature superconductors, heavy Fermion and related uranium and rare earth materials, and started some work on transition metal oxides. We have also had beamtime at the Brookhaven NSLS, 5 days of beamtime on the Dragon monochromator, beamline U4B, studying resonant photoemission of transition metal oxides using photon energies around the transition metal 2p edges. Data from past runs has been analyzed, and in some cases combined with photoemission and bremsstrahlung isochromat spectroscopy (BIS) data taken in the home U-M lab. 1 fig.

Not Available

1992-07-01T23:59:59.000Z

339

Photodiode-Based X-Ray Beam-Position Monitor With High Spatial-Resolution for the NSLS-II Beamlines  

SciTech Connect (OSTI)

We developed a photodiode-based monochromatic X-ray beam-position monitor (X-BPM) with high spatial resolution for the project beamlines of the NSLS-II. A ring array of 32 Si PIN-junction photodiodes were designed for use as a position sensor, and a low-noise HERMES4 ASIC chip was integrated into the electronic readout system. A series of precision measurements to characterize electrically the Si-photodiode sensor and the ASIC chip demonstrated that the inherent noise is sufficiently below tolerance levels. Following up modeling of detector's performance, including geometrical optimization using a Gaussian beam, we fabricated and assembled a first prototype. In this paper, we describe the development of this new state-of-the-art X-ray BPM along the beamline, in particular, downstream from the monochromator.

Yoon, P.S.; Siddons, D. P.

2009-05-25T23:59:59.000Z

340

Theoretical efficiency analysis of a condenser-embedded grating-based spectral purity filter for EUV lithography  

SciTech Connect (OSTI)

Being based on reflective optics, extreme ultraviolet (EUV) lithography systems are, in principle, relatively immune to chromatic errors. However, illumination bandwidth control is still required for EUV lithography. For example, appreciable amounts of UV power, combined with resist sensitivity to this wavelength band, would decrease image contrast. Also, appreciable amounts of IR power would place unacceptable thermal loads on the projection optics. A practical method for spectral filtering, widely used in short-wavelength synchrotron applications, is the grating monochromator. Here we present the theoretical performance analysis of a grating-based spectral purity filter integrated into an EUV lithography condenser system. Although the specific examples presented here are geared towards a specific condenser design, it should be noted that the methods described are generally applicable to a variety of condenser designs as might be found in future EUV lithography systems.

Naulleau, Patrick P.; Sweatt, William C.; Tichenor, Daniel A.

2002-09-02T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

PDX diagnostic control system  

SciTech Connect (OSTI)

This paper describes a computer-base diagnostic control system operating on the PDX Tokamak. The prime function of the system is to control mechanical positioning devices associated with various diagnostics including Thomson Scattering, X-Ray Pulse Height Analyzer, Rotating Scanning Monochromator, Fast Ion Detection Experiment, Bolometers and Plasma Limiters. The diagnostic control system consists of a PDP-11/34 computer, a CAMAC system partitioned between the PDX control room and the PDX machine area, and special electronic control modules developed at PPL. The special modules include a digital closed loop motor controller and user interface control panel for control and status display. A standard control panel was developed for interfacing each system user with the PDP-11/34 computer, through specially developed CAMAC modules.

Mika, R.

1981-01-01T23:59:59.000Z

342

Nanoparticle characterization by continuous contrast variation in SAXS with a solvent density gradient  

E-Print Network [OSTI]

Many low-density nanoparticles show a radial inner structure. This work proposes a novel approach to contrast variation with SAXS based on the constitution of a solvent density gradient in a glass capillary in order to resolve this internal morphology. Scattering curves of a polymeric core-shell colloid were recorded at different suspending medium contrasts at the four-crystal monochromator beamline of PTB at the synchrotron radiation facility BESSY II. The mean size and size distribution of the particles as well as an insight into the colloid electron density composition were determined using the position of the isoscattering points in the Fourier region of the scattering curves and by examining the Guinier region in detail. These results were corroborated with a model fit to the experimental data, which provided complementary information about the inner electron density distribution of the suspended nanoparticles.

Raul Garcia-Diez; Christian Gollwitzer; Michael Krumrey

2014-10-27T23:59:59.000Z

343

A simple transfer-optics system for an extreme-ultraviolet synchrotron beamline  

SciTech Connect (OSTI)

Radiometric experiments often require comparatively high intensities in the extreme ultraviolet, in the microwatt range. The monochromators that provide the high throughput needed for these experiments, though, do not always allow for end stations to be switched out easily. At the National Institute of Standards and Technology Synchrotron Ultraviolet Radiation Facility, the only beamline with sufficient extreme-ultraviolet power has a multi-ton endstation, which cannot be moved. We will describe a set of transfer optics that allow the photon beam to be collimated and deflected through a port on the downstream end of the large chamber. This allowed an absolute cryogenic radiometer to be attached, with the entrance cavity underfilled. We will describe ray-tracing results and offer preliminary results of the radiometer-based throughput of the system.

Tarrio, C.; Grantham, S.; Vest, R.E.; Liu, K. [Electron and Optical Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8410 (United States)

2005-04-01T23:59:59.000Z

344

Precision optical slit for high heat load or ultra high vacuum  

DOE Patents [OSTI]

This invention relates generally to slits used in optics that must be precisely aligned and adjusted. The optical slits of the present invention are useful in x-ray optics, x-ray beam lines, optical systems in which the entrance slit is critical for high wavelength resolution. The invention is particularly useful in ultra high vacuum systems where lubricants are difficult to use and designs which avoid the movement of metal parts against one another are important, such as monochromators for high wavelength resolution with ultra high vacuum systems. The invention further relates to optical systems in which temperature characteristics of the slit materials is important. The present invention yet additionally relates to precision slits wherein the opposing edges of the slit must be precisely moved relative to a center line between the edges with each edge retaining its parallel orientation with respect to the other edge and/or the center line. 21 figures.

Andresen, N.C.; DiGennaro, R.S.; Swain, T.L.

1995-01-24T23:59:59.000Z

345

Atlas of uranium emission intensities in a hollow cathode discharge  

SciTech Connect (OSTI)

The uranium emission spectrum from a hollow cathode discharge is displayed from 11,000 to 26,000 cm/sup -1/. This atlas lists 4928 spectral lines of uranium; 3949 are classified to the neutral spectrum and 431 are classified to the singly ionized spectrum. Listed wavenumbers are accurate to +-0.003 cm/sup -1/ and the listed relative intensities to +-8%. The richness of the spectrum makes this atlas useful for wavenumber calibration of lasers, spectrographs, and monochromators to an accuracy of 1 part in 10/sup 7/. This atlas is also useful as a guide to the uranium spectrum, and relative oscillator strengths (gf values) can be calculated from the intensities to a precision of +-20%.

Palmer, B.A.; Keller, R.A.; Engleman, R. Jr.

1980-07-01T23:59:59.000Z

346

Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT  

E-Print Network [OSTI]

The gravitational spectrometer GRANIT will be set up at the Institut Laue Langevin. It will profit from the high ultracold neutron density produced by a dedicated source. A monochromator made of crystals from graphite intercalated with potassium will provide a neutron beam with 0.89 nm incident on the source. The source employs superthermal conversion of cold neutrons in superfluid helium, in a vessel made from BeO ceramics with Be windows. A special extraction technique has been tested which feeds the spectrometer only with neutrons with a vertical velocity component v < 20 cm/s, thus keeping the density in the source high. This new source is expected to provide a density of up to 800 1/cm3 for the spectrometer.

P. Schmidt-Wellenburg; K. H. Andersen; P. Courtois; M. Kreuz; S. Mironov; V. V. Nesvizhevsky; G. Pignol; K. V. Protasov; T. Soldner; F. Vezzu; O. Zimmer

2009-01-29T23:59:59.000Z

347

Ultracold-neutron infrastructure for the gravitational spectrometer GRANIT  

E-Print Network [OSTI]

The gravitational spectrometer GRANIT will be set up at the Institut Laue Langevin. It will profit from the high ultracold neutron density produced by a dedicated source. A monochromator made of crystals from graphite intercalated with potassium will provide a neutron beam with 8.9 Angstrom incident on the source. The source employs superthermal conversion of cold neutrons in superfluid helium, in a vessel made from BeO ceramics with Be windows. A special extraction technique has been tested which feeds the spectrometer only with neutrons with a vertical velocity component v = 20 cm/s, thus keeping the density in the source high. This new source is expected to provide a density of up to R = 800 cm-3 for the spectrometer.

Schmidt-Wellenburg, P; Courtois, P; Kreuz, M; Mironov, S; Nesvizhevsky, V V; Pignol, G; Protasov, K V; Soldner, T; Vezzu, F; Zimmer, O

2008-01-01T23:59:59.000Z

348

Organic light-emitting diodes from homoleptic square planar complexes  

DOE Patents [OSTI]

Homoleptic square planar complexes [M(N.LAMBDA.N).sub.2], wherein two identical N.LAMBDA.N bidentate anionic ligands are coordinated to the M(II) metal center, including bidentate square planar complexes of triazolates, possess optical and electrical properties that make them useful for a wide variety of optical and electrical devices and applications. In particular, the complexes are useful for obtaining white or monochromatic organic light-emitting diodes ("OLEDs"). Improved white organic light emitting diode ("WOLED") designs have improved efficacy and/or color stability at high brightness in single- or two-emitter white or monochrome OLEDs that utilize homoleptic square planar complexes, including bis[3,5-bis(2-pyridyl)-1,2,4-triazolato]platinum(II) ("Pt(ptp).sub.2").

Omary, Mohammad A

2013-11-12T23:59:59.000Z

349

A high-order harmonic generation apparatus for time- and angle-resolved photoelectron spectroscopy  

SciTech Connect (OSTI)

We present a table top setup for time- and angle-resolved photoelectron spectroscopy to investigate band structure dynamics of correlated materials driven far from equilibrium by femtosecond laser pulse excitation. With the electron-phonon equilibration time being in the order of 1–2 ps it is necessary to achieve sub-picosecond time resolution. Few techniques provide both the necessary time and energy resolution to map non-equilibrium states of the band structure. Laser-driven high-order harmonic generation is such a technique. In our experiment, a grating monochromator delivers tunable photon energies up to 40 eV. A photon energy bandwidth of 150 meV and a pulse duration of 100 fs FWHM allow us to cover the k-space necessary to map valence bands at different k{sub z} and detect outer core states.

Frietsch, B.; Gahl, C.; Teichmann, M.; Weinelt, M. [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany)] [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany); Carley, R. [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany) [Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany); Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany); Döbrich, K. [Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany)] [Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany); Schwarzkopf, O.; Wernet, Ph. [Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin (Germany)] [Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin (Germany)

2013-07-15T23:59:59.000Z

350

Commissioning and first results of scanning type EXAFS beamline (BL-09) at INDUS-2 synchrotron source  

SciTech Connect (OSTI)

An Energy Scanning X-ray Absorption Fine Structure spectroscopy beamline has recently been installed and commissioned at BL-09 bending magnet port of INDUS-2 synchrotron source, Indore. The beamline uses an UHV compatible fixed exit double crystal monochromator (DCM) with two Si (111) crystals. Two grazing incidence cylindrical mirrors are also used in this beamline; the pre-mirror is used as a collimating mirror while the post mirror is used for vertical focusing and higher harmonic rejection. In this beamline it is possible to carry out EXAFS measurements both in transmission and fluorescence mode on various types of samples, using Ionization chamber detectors and solid state drift detector respectively. In this paper, results from first experiments of the Energy Scanning EXAFS beamline are presented.

Poswal, A. K., E-mail: poswalashwini@gmail.com; Agrawal, A., E-mail: poswalashwini@gmail.com; Yadav, A. K., E-mail: poswalashwini@gmail.com; Nayak, C., E-mail: poswalashwini@gmail.com; Basu, S., E-mail: poswalashwini@gmail.com; Bhattachryya, D.; Jha, S. N.; Sahoo, N. K. [Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai -400085 (India); Kane, S. R.; Garg, C. K. [Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore- 452013 (India)

2014-04-24T23:59:59.000Z

351

Investigation of Nitro-Organic Compounds in Diesel Engine Exhaust: Final Report, February 2007 - April 2008  

SciTech Connect (OSTI)

The National Renewable Energy Laboratory upgraded its ReFUEL engine and vehicle testing facility to speciate unregulated gas-phase emissions. To complement this capability, the laboratory contracted with the Colorado School of Mines (CSM) to study the effects of soy biodiesel fuel and a diesel particle filter (DPF) on emissions of polycyclic aromatic hydrocarbons (PAH) and nitro-polycyclic aromatic hydrocarbons (NPAH). CSM developed procedures to sample diesel particulate matter (PM) emissions from raw and diluted exhaust, with and without a DPF. They also developed improved procedures for extracting PAH and NPAH from the PM and quantifying them with a gas chromatograph-electron monochromator mass spectrometer. The study found the DPF generally reduced PAH emissions by 1 to 3 orders of magnitude. PAH conversion was lowest for B100, suggesting that PAHs were forming in the DPF. Orders of magnitude reductions were also found for NPAH emissions exiting the DPF.

Dane, J.; Voorhees, K. J.

2010-06-01T23:59:59.000Z

352

White organic light-emitting diodes: Status and perspective  

E-Print Network [OSTI]

White organic light-emitting diodes (OLEDs) are ultra-thin, large-area light sources made from organic semiconductor materials. Over the last decades, much research has been spent on finding the suitable materials to realize highly efficient monochrome and white OLEDs. With their high efficiency, color-tunability, and color-quality, white OLEDs are emerging to become one of the next generation light sources. In this review, we discuss the physics of a variety of device concepts that are introduced to realize white OLEDs based on both polymer and small molecule organic materi als. Owing to the fact that about 80 % of the internally generated photons are trapped within the thin-film layer structure, we put a second focus on reviewing promising concepts for improved light outcoupling.

Reineke, Sebastian; Lüssem, Björn; Leo, Karl

2013-01-01T23:59:59.000Z

353

Enhanced light emission from top-emitting organic light-emitting diodes by optimizing surface plasmon polariton losses  

E-Print Network [OSTI]

We demonstrate enhanced light extraction for monochrome top-emitting organic light-emitting diodes (OLEDs). The enhancement by a factor of 1.2 compared to a reference sample is caused by the use of a hole transport layer (HTL) material possessing a low refractive index (1.52). The low refractive index reduces the in-plane wave vector of the surface plasmon polariton (SPP) excited at the interface between the bottom opaque metallic electrode (anode) and the HTL. The shift of the SPP dispersion relation decreases the power dissipated into lost evanescent excitations and thus increases the outcoupling efficiency, although the SPP remains constant in intensity. The proposed method is suitable for emitter materials owning isotropic orientation of the transition dipole moments as well as anisotropic, preferentially horizontal orientation, resulting in comparable enhancement factors. Furthermore, for sufficiently low refractive indices of the HTL material, the SPP can be modeled as a propagating plane wave within ot...

Fuchs, Cornelius; Wieczorek, Martin; Gather, Malte C; Hofmann, Simone; Reineke, Sebastian; Leo, Karl; Scholz, Reinhard

2015-01-01T23:59:59.000Z

354

Mirror mounts designed for the Advanced Photon Source SRI-CAT  

SciTech Connect (OSTI)

Use of a mirror for beamlines at third-generation synchrotron radiation facilities, such as the Advanced Photon Source (APS) at Argonne National laboratory, has many advantages. A mirror as a first optical component provides significant reduction in the beam peak heat flux and total power on the downstream monochromator and simplifies the bremsstrahlung shielding design for the beamline transport. It also allows one to have a system for multibeamline branching and switching. More generally, a mirror is used for beam focusing and/or low-pass filtering. Six different mirror mounts have been designed for the SRI-CAT beamlines. Four of them are designed as water-cooled mirrors for white or pink beam use, and the other two are for monochromatic beam use. Mirror mount designs, including vacuum vessel structure and precision supporting stages, are presented in this paper.

Shu, D.; Benson, C.; Chang, J. [and others

1997-09-01T23:59:59.000Z

355

Development of soft X-ray polarized light beamline on Indus-2 synchrotron radiation source  

SciTech Connect (OSTI)

This article describes the development of a soft x-ray beamline on a bending magnet source of Indus-2 storage ring (2.5 GeV) and some preliminary results of x-ray absorption spectroscopy (XAS) measurements using the same. The beamline layout is based on a spherical grating monochromator. The beamline is able to accept synchrotron radiation from the bending magnet port BL-1 of the Indus-2 ring with a wide solid angle. The large horizontal and vertical angular acceptance contributes to high photon flux and selective polarization respectively. The complete beamline is tested for ultrahigh vacuum (UHV) ? 10{sup ?10} mbar. First absorption spectrum was obtained on HOPG graphite foil. Our performance test indicates that modest resolving power has been achieved with adequate photon flux to carry out various absorption experiments.

Phase, D. M., E-mail: mgupta@csr.res.in; Gupta, Mukul, E-mail: mgupta@csr.res.in; Potdar, S., E-mail: mgupta@csr.res.in; Behera, L., E-mail: mgupta@csr.res.in; Sah, R., E-mail: mgupta@csr.res.in; Gupta, Ajay, E-mail: mgupta@csr.res.in [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001 (India)

2014-04-24T23:59:59.000Z

356

This free copy brought to you by Rutgers University, Office of Continuing Professional Education. Copyrighted materials (annotations) have been removed.  

E-Print Network [OSTI]

of the Campground Facilities Act, NJ.S.A. 5:16-1 et seq. SUBCHAPTER 9. UTILITIES 8:22-9.1 Electricity 8:22-9.2 Fuel Storm water drainage Sewage disposal facilities 8:22-6.1 8:22-6.2 8:22-6.3 8:22-6.4 8:22-6.5 8:22-6.6 8 and operators thereof, shall be governed. Proprietary campgrounds are exempted from these requirements. 8

Goodman, Robert M.

357

CX-012012: Categorical Exclusion Determination  

Office of Energy Efficiency and Renewable Energy (EERE)

State Energy Program - Program Year 2014 - Formula Award - Administrative and Legal Requirement Doc (ALRD) CX(s) Applied: A9, A11, B1.2, B1.24, B5.1, B5.14, B5.16, B5.17, B5.18, B5.19, B5.20, B5.22 Date: 04/09/2014 Location(s): CX: none Offices(s): Golden Field Office

358

--No Title--  

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

163.1 85,541.6 8,077.2 19,873.3 4,301.7 18,951.8 February... 12,275.7 92,542.9 8,518.3 18,272.6 5,002.9 19,215.6 March... 11,739.4 94,011.5 7,748.5 16,650.5...

359

--No Title--  

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

1996... 24.1 25.4 17.8 108.5 27.1 153.4 1997 January... 20.6 22.0 14.8 98.3 26.4 139.6 February.. 22.1 23.7 15.4 102.9 31.2 149.5 March..... 24.0 25.5 16.8 106.4 27.7 150.9...

360

MSU-Bozeman Total Faculty  

E-Print Network [OSTI]

Associate Assistant Total College of Agriculture Agricultural Economics & Economics 2 1 8 5 16 20 100 0 18.8 Agricultural Education 1 1 1 1 4 0 0 50 25.0 Animal & Range Sciences 1 1 1 13 1 1 2 3 2 2 4 14 33 50 43 42.9 Film & Photography 1 1 3 5 3 1 14 17 25 75 35.7 Music

Maxwell, Bruce D.

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Capital flows to Latin American countries: effects of foreign direct investment and remittances on growth and development  

E-Print Network [OSTI]

remittances shock..................... 119 Figure 5.15: Utility dynamics following a remittances shock................................ 122 Figure 5.16: Trade balance dynamics following a remittances shock.................... 124 Figure B.1: Evolution....... 74 Table 4.3 ? Effect of FDI on Employment Rate by the Level of Inflation (Yearly Inflation less than 50% and greater than 50%)...................... 76 Table 4.4 ? Effect of FDI on Employment Rate by Level of Informality...

Vacaflores Rivero, Diego Eduardo

2009-05-15T23:59:59.000Z

362

EarlyExperienceOnBlueGeneQ.pptx  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6.3 27.5 Add 3.7 3.3 8.9 8.7 28.4 Triad 3.7 3.3 8.9 8.5 28.5 Store 6.0 7.3 11.3 10.5 16.0 Lesson Learned: 1. N ode m emory b andwidth i s l imited. 2. W ith h igh l evel o f c...

363

Sub-mm and X-ray background: two unrelated phenomena?  

E-Print Network [OSTI]

Obscured AGNs are thought to contribute a large fraction of the hard X-ray background (2-10 keV), and have also been proposed as the powerhouse of a fraction of the SCUBA sources which make most of the background at 850um, thus providing a link between the two spectral windows. We have tackled this issue by comparing data at 2-10 keV and at 850um for a sample of 34 sources at fluxes (or limiting fluxes) which resolve most of the background in the two bands. We present here new SCUBA observations, and new correlations between separate data sets retrieved from the literature. Similar correlations presented by others are added for completeness. None of the 11 hard X-ray (2-10 keV) sources has a counterpart at 850um, with the exception of a Chandra source in the SSA13 field, which is a candidate type 2, heavily absorbed QSO at high redshift. The ratios F(850um)/F(5keV) (mostly upper limits) of the X-ray sources are significantly lower than the value observed for the cosmic background. In particular, we obtain that 2-10 keV sources brighter than 10^-15 erg s^-1 cm^-2, which make at least 75% of the background in this band, contribute for less than 7% to the submillimeter background. Out of the 24 SCUBA sources, 23 are undetected by Chandra. The ratios F(850um)/F(5keV) (mostly lower limits) of these SCUBA sources indicate that most of them must be powered either by starburst activity, or by an AGN which is obscured by a column Nh > 10^25 cm^-2, with a reflection efficiency in the hard X rays significantly lower than 1% in most cases. However, AGNs of this type could not contribute significantly to the 2-10 keV background.

P. Severgnini; R. Maiolino; M. Salvati; D. Axon; A. Cimatti; F. Fiore; R. Gilli; F. La Franca; A. Marconi; G. Matt; G. Risaliti; C. Vignali

2000-06-16T23:59:59.000Z

364

Measurement of neutron capture on 50Ti at thermonuclear energies  

E-Print Network [OSTI]

At the Karlsruhe and Tuebingen 3.75 MV Van de Graaff accelerators the thermonuclear 50Ti(n,gamma)51Ti(5.8 min) cross section was measured by the fast cyclic activation technique via the 320.852 and 928.65 keV gamma-ray lines of the 51Ti-decay. Metallic Ti samples of natural isotopic composition and samples of TiO2 enriched in 50Ti by 67.53 % were irradiated between two gold foils which served as capture standards. The capture cross-section was measured at the neutron energies 25, 30, 52, and 145 keV, respectively. The direct capture cross section was determined to be 0.387 +/- 0.011 mbarn at 30 keV. We found evidence for a bound state s-wave resonance with an estimated radiative width of 0.34 eV which destructively interfers with direct capture. The strength of a suggested s-wave resonance at 146.8 keV was determined. The present data served to calculate, in addition to the directly measured Maxwellian averaged capture cross sections at 25 and 52 keV, an improved stellar 50Ti(n,gamma)51Ti rate in the thermonuclear energy region from 1 to 250 keV. The new stellar rate leads at low temperatures to much higher values than the previously recommended rate, e.g., at kT=8 keV the increase amounts to about 50 %. The new reaction rate therefore reduces the abundance of 50Ti due to s-processing in AGB stars.

P. V. Sedyshev; P. Mohr; H. Beer; H. Oberhummer; Yu. P. Popov; W. Rochow

1999-07-28T23:59:59.000Z

365

ORIGAMIX, a CdTe-based spectro-imager development for nuclear applications  

E-Print Network [OSTI]

The Astrophysics Division of CEA Saclay has a long history in the development of CdTe based pixelated detection planes for X and gamma-ray astronomy, with time-resolved imaging and spectrometric capabilities. The last generation, named Caliste HD, is an all-in-one modular instrument that fulfills requirements for space applications. Its full-custom front-end electronics is designed to work over a large energy range from 2 keV to 1 MeV with excellent spectroscopic performances, in particular between 10 and 100 keV (0.56 keV FWHM and 0.67 keV FWHM at 13.9 and 59.5 keV). In the frame of the ORIGAMIX project, a consortium based on research laboratories and industrials has been settled in order to develop a new generation of gamma camera. The aim is to develop a system based on the Caliste architecture for post-accidental interventions or homeland security, but integrating new properties (advanced spectrometry, hybrid working mode) and suitable for industry. A first prototype was designed and tested to acquire fee...

Dubos, S; Schanne, S; Limousin, O; Carrel, F; Schoepff, V; Blondel, C

2015-01-01T23:59:59.000Z

366

Evaluation of 5 mm-thick CdTe Detectors from the Company Acrorad  

E-Print Network [OSTI]

Using 2.0 cm x 2.0 cm x 0.5 cm Cadmium Telluride (CdTe) substrates from the company Acrorad, we have fabricated detectors with planar cathode contacts and 8x8 anode pixels. We investigate the I-V characteristics and energy resolution of the detectors for different contact materials and surface treatments. After biasing the detectors for a certain period of time, the dark currents increase dramatically. Out studies show that the time before breakdown decreases for higher detector temperatures and higher applied bias voltages. We obtained the best results with a Pt cathode and In anode pixels when we heat the detector to 90 C for 30 minutes prior to depositing the In contacts. Flood-illuminating the detector with 662 keV X-rays, we measured the pulse length distribution and derived an electron mobility of ~860 cm^(2)/V/s. We show that the energy resolution can be improved by correcting the anode signals for the depth of the primary interaction. Operated at -40 C and cathode bias of -500 V, the best pixels of the best detector achieved full width half maximum (FWHM) energy resolutions of 8 keV (6.4%) and 23 keV (3.4%) at 122 keV and 662 keV, respectively.

A. B. Garson III; I. V. Jung; J. Perkins; H. Krawczynski

2005-11-18T23:59:59.000Z

367

Spectral properties of the soft excess pulsar RX J0059.2-7138 during its 2013 outburst  

E-Print Network [OSTI]

We report on an X-ray observation of the Be X-ray Binary Pulsar RX J0059.2-7138, performed by XMM-Newton in March 2014. The 19 ks long observation was carried out about three months after the discovery of the latest outburst from this Small Magellanic Cloud transient, when the source luminosity was Lx ~ 10$^{38}$ erg/s. A spin period of P=2.762383(5) s was derived, corresponding to an average spin-up of $\\dot{P}_{\\mathrm{spin}} = -(1.27\\pm0.01)\\times10^{-12}$ s $s^{-1}$ from the only previous period measurement, obtained more than 20 years earlier. The time-averaged continuum spectrum (0.2-12 keV) consisted of a hard power-law (photon index ~0.44) with an exponential cut-off at a phase-dependent energy (20-50 keV) plus a significant soft excess below about 0.5 keV. In addition, several features were observed in the spectrum: an emission line at 6.6 keV from highly ionized iron, a broad feature at 0.9-1 keV likely due to a blend of Fe L-shell lines, and narrow emission and absorption lines consistent with tran...

Sidoli, L; Esposito, P; Tiengo, A; Mereghetti, S

2015-01-01T23:59:59.000Z

368

ZnMoO4: a promising bolometer for neutrinoless double beta decay searches  

E-Print Network [OSTI]

We investigate the performances of two ZnMoO4 scintillating crystals operated as bolometers, in view of a next generation experiment to search the neutrinoless double beta decay of Mo-100. We present the results of the alpha vs beta/gamma discrimination, obtained through the scintillation light as well as through the study of the shape of the thermal signal alone. The discrimination capability obtained at the 2615 keV line of Tl-208 is 8 sigma, using the heat-light scatter plot, while it exceeds 20 sigma using the shape of the thermal pulse alone. The achieved FWHM energy resolution ranges from 2.4 keV (at 238 keV) to 5.7 keV (at 2615 keV). The internal radioactive contaminations of the ZnMoO4 crystals were evaluated through a 407 hours background measurement. The obtained limit is < 32 microBq/kg for Th-228 and Ra-226. These values were used for a Monte Carlo simulation aimed at evaluating the achievable background level of a possible, future array of enriched ZnMoO4 crystals.

J. W. Beeman; F. Bellini; S. Capelli; L. Cardani; N. Casali; I. Dafinei; S. Di Domizio; F. Ferroni; E. N. Galashov; L. Gironi; F. Orio; L. Pattavina; G. Pessina; G. Piperno; S. Pirro; V. N. Shlegel; Ya. V. Vasilyev; C. Tomei; M. Vignati

2012-02-01T23:59:59.000Z

369

Solar Flare Element Abundances from the Solar Assembly for X-rays (SAX) on MESSENGER  

E-Print Network [OSTI]

X-ray spectra in the range $1.5-8.5$~keV have been analyzed for 526 large flares detected with the Solar Assembly for X-rays (SAX) on the Mercury {\\em MESSENGER} spacecraft between 2007 and 2013. For each flare, the temperature and emission measure of the emitting plasma were determined from the spectrum of the continuum. In addition, with the SAX energy resolution of 0.6 keV (FWHM) at 6~keV, the intensities of the clearly resolved Fe-line complex at 6.7~keV and the Ca-line complex at 3.9~keV were determined, along with those of unresolved line complexes from S, Si, and Ar at lower energies. Comparisons of these line intensities with theoretical spectra allow the abundances of these elements relative to hydrogen to be derived, with uncertainties due to instrument calibration and the unknown temperature distribution of the emitting plasma. While significant deviations are found for the abundances of Fe and Ca from flare to flare, the abundances averaged over all flares are found to be enhanced over photospheri...

Dennis, B R; Schwartz, R A; Tolbert, A K; Starr, R D; Nittler, L R

2015-01-01T23:59:59.000Z

370

The Large Observatory For X-ray Timing: LOFT  

E-Print Network [OSTI]

LOFT, the Large Observatory for X-ray Timing, is a new space mission concept devoted to observations of Galactic and extra-Galactic sources in the X-ray domain with the main goals of probing gravity theory in the very strong field environment of black holes and other compact objects, and investigating the state of matter at supra-nuclear densities in neutron stars. The instruments on-board LOFT, the Large area detector and the Wide Field Monitor combine for the first time an unprecedented large effective area (~10 m2 at 8 keV) sensitive to X-ray photons mainly in the 2-30 keV energy range and a spectral resolution approaching that of CCD-based telescopes (down to 200 eV at 6 keV). LOFT is currently competing for a launch of opportunity in 2022 together with the other M3 mission candidates of the ESA Cosmic Vision Program.

Bozzo, E

2013-01-01T23:59:59.000Z

371

RF Design Optimization for New Injector Cryounit at CEBAF  

SciTech Connect (OSTI)

A new injector superconducting RF (SRF) cryounit with one new 2-cell, B=0.6 cavity plus one refurbished 7-cell, B=0.97, C100 style cavity has been re-designed and optimized for the engineering compatibility of existing module for CEBAF operation. The optimization of 2-cell cavity shape for longitudinal beam dynamic of acceleration from 200keV to 533keV and the minimization of transverse kick due to the waveguide couplers to less than 1 mrad have been considered. Operating at 1497MHz, two cavities has been designed into a same footprint of CEBAF original quarter cryomodule to deliver an injection beam energy of 5MeV in less than 0.27{degree} rms bunch length and a maximum energy spread of 5keV.

Wang, Haipeng; Cheng, Guangfeng; Hannon, Fay E.; Hofler, Alicia S.; Kazimi, Reza; Preble, Joe; Rimmer, Robert A.

2013-06-01T23:59:59.000Z

372

Coulomb displacement energies as a probe for nucleon pairing in the $f_{7/2}$ shell  

E-Print Network [OSTI]

Coulomb displacement energies of $T=1/2$ mirror nuclei have been studied via a series of high-precision $Q_\\mathrm{EC}$-value measurements with the double Penning trap mass spectrometer JYFLTRAP. Most recently, the $Q_\\mathrm{EC}$ values of the $f_{7/2}$-shell mirror nuclei $^{45}$V ($Q_\\mathrm{EC}=7123.82(22)$ keV) and $^{49}$Mn ($Q_\\mathrm{EC}=7712.42(24)$ keV) have been measured with an unprecedented precision. The data reveal a 16-keV ($1.6\\sigma$) offset in the adopted Atomic Mass Evaluation 2012 value of $^{49}$Mn suggesting the need for further measurements to verify the breakdown of the quadratic form of the isobaric multiplet mass equation. Precisely measured $Q_\\mathrm{EC}$ values confirm that the pairing effect in the Coulomb energies is quenched when entering the $f_{7/2}$ shell and reaches a minimum in the midshell.

A. Kankainen; T. Eronen; D. Gorelov; J. Hakala; A. Jokinen; V. S. Kolhinen; M. Reponen; J. Rissanen; A. Saastamoinen; V. Sonnenschein; J. Äystö

2014-03-17T23:59:59.000Z

373

Q-values of the Superallowed beta-Emitters 26m-Al, 42-Sc and 46-V and their impact on V_ud and the Unitarity of the CKM Matrix  

E-Print Network [OSTI]

The beta-decay Q_EC-values of the superallowed beta emitters 26m-Al, 42-Sc and 46-V have been measured with a Penning trap to a relative precision of better than 8x10^-9. Our result for 46-V, 7052.72(31) keV, confirms a recent measurement that differed significantly from the previously accepted reaction-based Q_EC-value. However, our results for 26m-Al and 42-Sc, 4232.83(13) keV and 6426.13(21) keV, are consistent with previous reaction-based values. By eliminating the possibility of a systematic difference between the two techniques, this result demonstrates that no significant shift in the deduced value of V_ud should be anticipated.

T. Eronen; J. C. Hardy; V. Elomaa; U. Hager; J. Hakala; A. Jokinen; A. Kankainen; V. S. Kolhinen; I. Moore; H. Penttila; S. Rahaman; J. Rissanen; A. Saastamoinen; T. Sonoda; J. Aysto

2006-06-27T23:59:59.000Z

374

Heat flow of the Earth and resonant capture of solar 57-Fe axions  

E-Print Network [OSTI]

In a very conservative approach, supposing that total heat flow of the Earth is exclusively due to resonant capture inside the Earth of axions, emitted by 57-Fe nuclei on Sun, we obtain limit on mass of hadronic axion: m_aEarth, this estimation could be improved to the value: m_a<1.6 keV. Both the values are less restrictive than limits set in devoted experiments to search for 57-Fe axions (m_a<216-745 eV), but are much better than limits obtained in experiments with 83-Kr (m_a<5.5 keV) and 7-Li (m_a<13.9-32 keV).

F. A. Danevich; A. V. Ivanov; V. V. Kobychev; V. I. Tretyak

2009-05-07T23:59:59.000Z

375

Performance of a large TeO2 crystal as a cryogenic bolometer in searching for neutrinoless double beta decay  

E-Print Network [OSTI]

Bolometers are ideal devices in the search for neutrinoless Double Beta Decay. Enlarging the mass of individual detectors would simplify the construction of a large experiment, but would also decrease the background per unit mass induced by alpha-emitters located close to the surfaces and background arising from external and internal gamma's. We present the very promising results obtained with a 2.13 kg TeO2 crystal. This bolometer, cooled down to a temperature of 10.5 mK in a dilution refrigerator located deep underground in the Gran Sasso National Laboratories, represents the largest thermal detector ever operated. The detector exhibited an energy resolution spanning a range from 3.9 keV (at 145 keV) to 7.8 keV (at the 2615 gamma-line of 208Tl) FWHM. We discuss the decrease in the background per unit mass that can be achieved increasing the mass of a bolometer.

L. Cardani; L. Gironi; J. W. Beeman; I. Dafinei; Z. Ge; G. Pessina; S. Pirro; Y. Zhu

2011-06-03T23:59:59.000Z

376

A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments  

SciTech Connect (OSTI)

We present data characterizing the performance of the _rst segmented, N- type Ge detector, isotopically enriched to 85% 76Ge. This detector, based on the Ortec PT6x2 design and referred to as SEGA (Segmented, Enriched Germanium Assembly), was developed as a possible prototype for neutrinoless double beta-decay measurements by the Majorana collaboration. We present some of the general characteristics (including bias potential, efficiency, leakage current, and integral cross-talk) for this detector in its temporary cryostat. We also present an analysis of the resolution of the detector, and demonstrate that for all but two segments there is at least one channel that reaches the Majorana resolution goal below 4 keV FWHM at 2039 keV, and all channels are below 4.5 keV FWHM.

Leviner, L.; Aalseth, Craig E.; Ahmed, M. W.; Avignone, F. T.; Back, Henning O.; Barabash, Alexander S.; Boswell, M.; De Braeckeleer, L.; Brudanin, V.; Chan, Yuen-Dat; Egorov, Viatcheslav; Elliott, Steven R.; Gehman, Victor M.; Hossbach, Todd W.; Kephart, Jeremy; Kidd, M. F.; Konovalov, S.; Lesko, Kevin; Li, Jingyi; Mei, Dongming; Mikhailov, S.; Miley, Harry S.; Radford, D. C.; Reeves, James H.; Sandukovsky, Viatcheslav; Umatov, Valdimir; Underwood, T. A.; Tornow, W.; Wu, Y. K.; Young, A.

2014-01-21T23:59:59.000Z

377

Gamma-ray observations of the Crab Region using a coded-aperture telescope  

SciTech Connect (OSTI)

The region of the Galactic anticenter, including the Crab Nebula, was observed during a balloon flight of the University of New Hampshire Directional Gamma-Ray Telescope employing the coded-aperture imaging technique to image celestial gamma-radiation between 160 keV and 9.3 MeV. The background systematics are treated with a simple and relatively straightforward correction procedure. The results demonstrate that the coded-aperture procedure is a viable approach for imaging not only point sources of radiation, but also extended sources of emission. The results for the Crab's photon spectrum are consistent with a power-law spectrum. Upper limits on the flux levels of line emission at 405 keV and 1050 keV and on the flux from the X-ray binary source A0535 + 26 and diffuse Galactic emission from the anticenter region are derived. 35 references.

Mcconnell, M.L.; Dunphy, P.P.; Forrest, D.J.; Chupp, E.L.; Owens, A.

1987-10-01T23:59:59.000Z

378

Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis  

E-Print Network [OSTI]

The $^{63}$Ni($n, \\gamma$) cross section has been measured for the first time at the neutron time-of-flight facility n\\_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian Averaged Cross Sections were calculated for thermal energies from kT = 5 keV to 100 keV with uncertainties around 20%. Stellar model calculations for a 25 M$_\\odot$ star show that the new data have a significant effect on the $s$-process production of $^{63}$Cu, $^{64}$Ni, and $^{64}$Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.

C. Lederer; C. Massimi; S. Altstadt; J. Andrzejewski; L. Audouin; M. Barbagallo; V. Bécares; F. Bevá; F. Belloni; E. Berthoumieux; J. Billowes; V. Boccone; D. Bosnar; M. Brugger; M. Calviani; F. Calviño; D. Cano-Ott; C. Carrapiço; F. Cerutti; E. Chiaveri; M. Chin; N. Colonna; G. Cortés; M. A. Cortés-Giraldo; M. Diakaki; C. Domingo-Pardo; I. Duran; R. Dressler; N. Dzysiuk; C. Eleftheriadis; A. Ferrari; K. Fraval; S. Ganesan; A. R. García; G. Giubrone; M. B. Gómez-Hornillos; I. F. Gonçalves; E. González-Romero; E. Griesmayer; C. Guerrero; F. Gunsing; P. Gurusamy; D. G. Jenkins; E. Jericha; Y. Kadi; F. Käppeler; D. Karadimos; N. Kivel; P. Koehler; M. Kokkoris; G. Korschinek; M. Krtika; J. Kroll; C. Langer; H. Leeb; L. S. Leong; R. Losito; A. Manousos; J. Marganiec; T. Martínez; P. F. Mastinu; M. Mastromarco; M. Meaze; E. Mendoza; A. Mengoni; P. M. Milazzo; F. Mingrone; M. Mirea; W. Mondelaers; C. Paradela; A. Pavlik; J. Perkowski; M. Pignatari; A. Plompen; J. Praena; J. M. Quesada; T. Rauscher; R. Reifarth; A. Riego; F. Roman; C. Rubbia; R. Sarmento; P. Schillebeeckx; S. Schmidt; D. Schumann; G. Tagliente; J. L. Tain; D. Tarrío; L. Tassan-Got; A. Tsinganis; S. Valenta; G. Vannini; V. Variale; P. Vaz; A. Ventura; R. Versaci; M. J. Vermeulen; V. Vlachoudis; R. Vlastou; A. Wallner; T. Ware; M. Weigand; C. Weiß; T. J. Wright; P. Zugec

2013-04-11T23:59:59.000Z

379

System for phase-contrast x-ray radiography using X pinch radiation and a method thereof  

DOE Patents [OSTI]

A radiograph system with an anode plate, a cathode plate, and a power source coupled to said anode plate and the cathode plate. At least two wires coupled between the anode plate and the cathode plate provide a configuration to form an X-pinch having a photon source size of less than five microns at energies above 2.5 keV. Material at the configuration forming the X-pinch vaporizes upon application of a suitable current to the wires forming a dense hot plasma and emitting a single x-ray pulse with sufficient photons having energies in the range of from about 2.5 keV to about 20 keV to provide a phase contrast image of an object in the path of the photons. Multiple simultaneous images may be formed of a plurality of objects. Suitable filters and x-ray detectors are provided.

Chandler, Katherine (Ithaca, NY); Chelkovenko, Tatiana (Moscow, RU); Hammer, David (Ithaca, NY); Pikuz, Sergei (Moscow, RU); Sinars, Daniel (Albuquerque, NM); Song, Byungmoo (Ithaca, NY)

2007-11-06T23:59:59.000Z

380

Broadband high resolution X-ray spectral analyzer  

DOE Patents [OSTI]

A broad bandwidth high resolution x-ray fluorescence spectrometer has a performance that is superior in many ways to those currently available. It consists of an array of 4 large area microcalorimeters with 95% quantum efficiency at 6 keV and it produces x-ray spectra between 0.2 keV and 7 keV with an energy resolution of 7 to 10 eV. The resolution is obtained at input count rates per array element of 10 to 50 Hz in real-time, with analog pulse processing and thermal pile-up rejection. This performance cannot be matched by currently available x-ray spectrometers. The detectors are incorporated into a compact and portable cryogenic refrigerator system that is ready for use in many analytical spectroscopy applications as a tool for x-ray microanalysis or in research applications such as laboratory and astrophysical x-ray and particle spectroscopy.

Silver, Eric H. (Berkeley, CA); Legros, Mark (Berkeley, CA); Madden, Norm W. (Livermore, CA); Goulding, Fred (Lafayette, CA); Landis, Don (Pinole, CA)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

The pulsed light curves of Her X-1 as observed by BeppoSAX  

E-Print Network [OSTI]

We report on the timing analysis of the observation of the X-ray binary pulsar Her X-1 performed during the BeppoSAX Science Verification Phase. The observation covered more that two full orbital cycles near the maximum of the main-on in the 35 day cycle of Her X-1. We present the pulse profiles from 0.1 to 100 keV. Major changes are present below 1 keV, where the appearance of a broad peak is interpreted as re-processing from the inner part of the accretion disk, and above 10 keV, where the pulse profile is less structured and the main peak is appreciably harder. The hardness ratios show complex changes with pulse phase at different energies.

D. Dal Fiume; M. Orlandini; G. Cusumano; S. Del Sordo; M. Feroci; F. Frontera; T. Oosterbroek; E. Palazzi; A. N. Parmar; A. Santangelo; A. Segreto

1997-12-01T23:59:59.000Z

382

Triton binding energy with realistic precision  

E-Print Network [OSTI]

We compute the binding energy of triton with realistic statistical errors stemming from NN scattering data uncertainties and the deuteron and obtain $E_t=-7.638(15) \\, {\\rm MeV}$. Setting the numerical precision as $\\Delta E_t^{\\rm num} \\lesssim 1 \\, {\\rm keV}$ we obtain the statistical error $\\Delta E_t^{\\rm stat}= 15(1) \\, {\\rm keV}$ which is mainly determined by the channels involving relative S-waves. This figure reflects the uncertainty of the input NN data, more than two orders of magnitude larger than the experimental precision $\\Delta E_t^{\\rm exp}= 0.1 \\, {\\rm keV}$ and provides a bottleneck in the realistic precision that can be reached. This suggests an important reduction in the numerical precision and hence in the computational effort.

R. Navarro Perez; E. Garrido; J. E. Amaro; E. Ruiz Arriola

2014-07-29T23:59:59.000Z

383

Survival probability and energy modification of hydrogen Energetic Neutral Atoms on their way from the termination shock to Earth orbit  

E-Print Network [OSTI]

Context: With the forthcoming launch of a NASA SMEX mission IBEX devoted to imaging of heliospheric interface by in-situ detection of Energetic Neutral Atoms (ENA) an important issue becomes recognizing of transport of these atoms from the termination shock of the solar wind to Earth orbit. Aims: Investigate modifications of energy and of survival probability of the H ENA detectable by IBEX (0.01 -- 6 keV) between the termination shock and Earth orbit taking into account the influence of the variable and anisotropic solar wind and solar EUV radiation. Methods: Energy change of the atoms is calculated by numerical simulations of orbits of the H ENA atoms from ~100 AU from the Sun down to Earth orbit, taking into account solar gravity and Lyman-$\\alpha$ radiation pressure, which is variable in time and depends on radial velocity of the atom. To calculate survival probabilities of the atoms against onization, a detailed 3D and time-dependent model of H ENA ionization based on observations of the solar wind and EUV ionizing radiation is constructed, and wth the use of this model probabilities of survival of the atoms are calculated by numerical integration along the previously calculated orbits. Results: Owing to the radiation pressure, H ENA reach the Earth orbit practically without energy and direction change except the atoms with energy lower than 0.1 keV during high solar activity. For a given energy at Earth orbit one expects fluctuations of survival probability from ~20% at 0.01 keV down to just a few percent at 6 keV and a modulation of survival probability as a function of the location at Earth orbit, ecliptic latitude of the arrival direction, and the phase of solar cycle with an amplitude of a few dozen percent for 0.1 keV atoms at solar minimum to a few percent for 6 keV atoms at solar maximum.

M. Bzowski

2008-06-14T23:59:59.000Z

384

Photon Interaction Studies with Some Glasses and Building Materials  

SciTech Connect (OSTI)

Mass attenuation coefficients of some shielding materials, namely, Bakelite, black cement, white cement, plaster of paris, and concrete were determined at 356-, 511-, 662-, 1173-, and 1332-keV energies, and those of glasses containing oxides of B, Cd, Pb, and Bi were determined only at 662 keV using a narrow beam transmission method. These coefficients of glasses were then used to determine their interaction cross sections, effective atomic numbers, and electron densities. Good agreement was observed between the experimental and theoretical values. It has been proven that glasses have a potential application as a transparent radiation shielding.

Singh, Harvinder [Guru Nanak Dev University (India); Singh, Kulwant [Guru Nanak Dev University (India); Sharma, Gopi [Guru Nanak Dev University (India); Nathuram, R. [Bhabha Atomic Research Centre (India); Sahota, H.S. [Punjabi University (India)

2002-11-15T23:59:59.000Z

385

Development of a low energy ion implantation system for the synthesis of GeXSi1-X alloys  

E-Print Network [OSTI]

traveling at a chosen speed v . The velocity of the particle is given by +2qV where V is the accelerating voltage or beam energy, M is the ion mass, and q is the ion charge. The magnetic force is given by F~ =Bqv, (2) where B is the magnetic field... to 160 keV was used to analyze the implant profiles. The design of the accelerator facility allows for in situ analysis of the target with 280 keV alpha particles by incorporating both beamlines into a common ultra high vacuum target chamber...

Court, John David

2012-06-07T23:59:59.000Z

386

Nuclear reaction analysis profiling as direct evidence for lithium ion mass transport in thin film rocking-chair'' structures  

SciTech Connect (OSTI)

A nuclear reaction analysis technique using the [ital p],[gamma] reaction, [sup 7]Li([ital p],[gamma])[sup 8]Be, occurring at approximately 440 keV, (half-width[approx]12 keV), has been utilized to determine the lithium concentration profiles in multilayer electrochromic window ( smart window'')/rechargeable battery cells when in their colored''/charged and bleached''/discharged states. The lithium profiles have been observed to shift according to the cells' states, thereby providing direct experimental evidence for the so-called rocking-chair model for such structures.

Goldner, R.B.; Haas, T.E.; Arntz, F.O.; Slaven, S.; Wong, K.K. (Electro-Optics Technology Center, Tufts University, Medford, Massachusetts 02155 (United States)); Wilkens, B. (Bellcore, Red Bank, New Jersey 07001-7040 (United States)); Shepard, C.; Lanford, W. (Accelerator Laboratory, Physics Department, State University of New York at Albany, Albany, New York 12222 (United States))

1993-04-05T23:59:59.000Z

387

Refractive optical elements and optical system for high energy x-ray microscopy  

SciTech Connect (OSTI)

In material science, X-ray radiation with photon energies above 25 keV is used because of its penetration into high density materials. Research of the inner structure of novel materials, such as electrodes in high power batteries for engines, require X-ray microscopes operating in the hard X-ray energy range. A flexible X-ray microscope for hard X-rays with photon energies higher than 25 keV will be realized at the synchrotron source ANKA in Karlsruhe, Germany. The device will use refractive X-ray lenses as condenser as well as objective lenses.

Simon, M.; Altapova, V.; Baumbach, T.; Kluge, M.; Last, A.; Marschall, F.; Mohr, J.; Nazmov, V.; Vogt, H. [Karlsruhe Institute of Technology, Institute of Microstructure Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Karlsruhe Institute of Technology, Laboratory for Applications of Synchrotron Radiation, Engesser Strasse 15, 76131 Karlsruhe (Germany); Karlsruhe Institute of Technology, Institute of Microstructure Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)

2012-05-17T23:59:59.000Z

388

Surface nanostructuring by ion-induced localized plasma expansion in zinc oxide  

SciTech Connect (OSTI)

Creation of hillock-like nanostructures on the surface of zinc oxide single crystals by irradiation with slow highly charged ions is reported. At constant kinetic energy, the nanostructures were only observed after irradiation with ions of potential energies above a threshold between 19.1?keV and 23.3?keV. The size of the nanostructures increases as a function of potential energy. A plasma expansion approach is used to explain the nanostructures creation. The calculations showed that the surface nanostructures became taller with the increase of ionic temperature. The influence of charged cluster formation and the relevance of their polarity are discussed.

El-Said, A. S., E-mail: elsaid@kfupm.edu.sa, E-mail: a.s.el-said@hzdr.de [Physics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261 (Saudi Arabia); Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328 Dresden (Germany); Physics Department, Faculty of Science, Mansoura University, 35516 Mansoura (Egypt); Moslem, W. M. [Department of Physics, Faculty of Science, Port Said University, Port Said 42521 (Egypt); Centre for Theoretical Physics, British University in Egypt (BUE), El-Shorouk City, Cairo (Egypt); Djebli, M. [Theoretical Physics Laboratory, Faculty of Physics USTHB, B.P. 32 Bab Ezzour, 16079 Algiers (Algeria)

2014-06-09T23:59:59.000Z

389

X-ray continuum emission spectroscopy from hot dense matter at Gbar pressures  

SciTech Connect (OSTI)

We have measured the time-resolved x-ray continuum emission spectrum of ?30 times compressed polystyrene created at stagnation of spherically convergent shock waves within the Gbar fundamental science campaign at the National Ignition Facility. From an exponential emission slope between 7.7 keV and 8.1 keV photon energy and using an emission model which accounts for reabsorption, we infer an average electron temperature of 375 ± 21 eV, which is in good agreement with HYDRA-1D simulations.

Kraus, D., E-mail: dominik.kraus@berkeley.edu; Falcone, R. W. [Department of Physics, University of California, Berkeley, California 94720 (United States); Döppner, T.; Kritcher, A. L.; Bachmann, B.; Collins, G. W.; Hawreliak, J. A.; Landen, O. L.; Ma, T.; Le Pape, S.; Swift, D. C. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Chapman, D. A. [Plasma Physics Group, Radiation Physics Department, AWE plc, Reading RG7 4PR, United Kingdom and Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL (United Kingdom); Glenzer, S. H. [SLAC National Accelerator Laboratory, Menlo Park, California 94309 (United States); Neumayer, P. [GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt (Germany)

2014-11-15T23:59:59.000Z

390

Measurements of Neutron Induced Cross Sections at the Oak Ridge Electron Linear Accelerator  

SciTech Connect (OSTI)

We have used the Oak Ridge Electron Linear Accelerator (ORELA) to measure neutron total and the fission cross sections of 233U in the energy range from 0.36 eV to ~700 keV. We report average fission and total cross sections. Also, we measured the neutron total cross sections of 27Al and Natural chlorine as well as the capture cross section of Al over an energy range from 100 eV up to about 400 keV.

Guber, K.H.; Harvey, J.A.; Hill, N.W.; Koehler, P.E.; Leal, L.C.; Sayer, R.O.; Spencer, R.R.

1999-09-20T23:59:59.000Z

391

Diffraction anomalous fine structure analysis on (Bi,Pb){sub 2}PtO{sub 4} powders  

SciTech Connect (OSTI)

The Diffraction Anomalous Fine Structure (DAFS) method can provide site selective and chemical selective structural information. The possibilities of DAFS experimental and data analysis procedures are demonstrated for (Bi{sub 1.67},Pb{sub 0.33}) powder samples. Experiments have been performed at both L{sub III} and K Pt edges (11.56.564keV and 78keV), using several data collection set-ups (analyser crystals, 1D-detector, 2D-detector). Based on this example, a comparison between these experimental procedures and analysis is given and discussed.

Vacinova, J. [Centre National de la Recherche Scientifique (CNRS), 38 - Grenoble (France). Lab. de Cristallographie; Hodeau, J.L.; Bordet, P. [European Synchrotron Radiation Facility, 38 - Grenoble (France)] [and others

1995-12-31T23:59:59.000Z

392

Next-Generation Germanium Spectrometer Background Reduction Techniques at 2 MeV  

SciTech Connect (OSTI)

The Majorana project, a next-generation 76Ge neutrinoless double-beta decay experiment being undertaken by a large international collaboration, has the goal of measuring the neutrinoless double-beta decay rate by observing monochromatic events at 2039 keV in 500 kg of isotopically enriched 76Ge gamma-ray spectrometers. In order to achieve the desired sensitivity limit, the background in the 2037-2041 keV region must be reduced to <1 event per year in the entire germanium array. The effects of various background reduction techniques, and the combination thereof, to produce a huge 76Ge spectrometer array with virtually zero background are discussed.

Brodzinski, Ronald L.

2005-04-01T23:59:59.000Z

393

Investigations of 2? decay measured by low background HPGe spectrometer OBELIX  

SciTech Connect (OSTI)

A low background high sensitive HPGe spectrometer OBELIX was installed at the Modane Underground Laboratory (LSM, France, 4800 m w.e.). The detector was designed to measure a contamination of enriched isotopes and radio-impurities in construction materials, to investigate rare nuclear processes such as resonance neutrinoless double electron capture and two-neutrino double beta decay to excited states of daughter nuclei. Spectrometer sensitivity, contamination of NEMO-3 sources and results of 2?2?{sup ?} decay of {sup 100}Mo to the 0{sup +} (1130 keV) and 2{sup +} (540 keV) excited states as well as future plans for OBELIX detector are given.

Rukhadze, Ekaterina [Institute of Experimental and Applied Physics, CTU in Prague, Horska 3a/22, 128 00 Prague 2 (Czech Republic); Collaboration: OBELIX Collaboration; SuperNEMO Collaboration

2013-12-30T23:59:59.000Z

394

Visual sensations during megavoltage radiotherapy to the orbit attributable to Cherenkov radiation  

SciTech Connect (OSTI)

During megavoltage photon and electron beam radiotherapy treatment involving the eye, patients commonly report visual sensations; 'nerve stimulation' is the conventional explanation. We propose that the phenomenon can be attributed to Cherenkov radiation inside the eye. The threshold electron energy for Cherenkov radiation in water is 260 keV. The human retina is able to perceive approximately 5-14 visible photons in 0.001 s. A single 500 keV electron traversing 1 mm of water will induce nearly 15 Cherenkov visible range photons. We propose that a portal image involving the eye will produce sufficient Cherenkov radiation to be detected by the retina.

Newman, Francis; Asadi-Zeydabadi, Masoud; Durairaj, Vikram D.; Ding Meisong; Stuhr, Kelly; Kavanagh, Brian [Department of Radiation Oncology, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045 (United States); Department of Physics, University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217 (United States); Department of Ophthalmology, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045 (United States); Department of Radiation Oncology, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045 (United States); Department of Radiation Oncology, University of Colorado Hospital, Aurora, Colorado 80045 (United States); Department of Radiation Oncology, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado, 80045 (United States)

2008-01-15T23:59:59.000Z

395

Compton scattering from positronium and validity of the impulse approximation  

SciTech Connect (OSTI)

The cross sections for Compton scattering from positronium are calculated in the range from 1 to 100 keV incident photon energy. The calculations are based on the A{sup 2} term of the photon-electron or photon-positron interaction. Unlike in hydrogen, the scattering occurs from two centers and the interference effect plays an important role for energies below 8 keV. Because of the interference, the criterion for validity of the impulse approximation for positronium is more restrictive compared to that for hydrogen.

Kaliman, Z.; Pisk, K.; Pratt, R. H. [Department of Physics, University of Rijeka, Rijeka (Croatia); Rudjer Boskovic Institute, P. O. Box 180, Zagreb (Croatia) and University of Dubrovnik, Dubrovnik (Croatia); Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)

2011-05-15T23:59:59.000Z

396

Titanium-Dioxide Nano-Fiber-Cotton Targets for Efficient Multi-keV X-Ray Generation  

SciTech Connect (OSTI)

Multi-keV x-ray generation from low-density (27 {+-} 7 mg/cc) nano-fiber-cotton targets composed of titanium-dioxide has been investigated. The cotton targets were heated volumetrically and supersonically to a peak electron temperature of 2.3 keV, which is optimal to yield Ti K-shell x rays. Considerable enhancement of conversion efficiency (3.7 {+-} 0.5%) from incident laser energy into Ti K-shell x rays (4-6 keV band) was attained in comparison with that (1.4 {+-} 0.9%) for a planar Ti-foil target.

Tanabe, M; Nishimura, H; Fujioka, S; Nagai, K; Yamamoto, N; Gu, Z; Pan, C; Girard, F; Primout, M; Villette, B; Brebion, D; Fournier, K B; Fujishima, A; Mima, K

2008-06-12T23:59:59.000Z

397

Titanium dioxide nanofiber-cotton targets for efficient multi-keV x-ray generation  

SciTech Connect (OSTI)

Multi-keV x-ray generation from low-density (27{+-}7 mg/cm{sup 3}) nanofiber-cotton targets composed of titanium dioxide has been investigated. The cotton targets were heated volumetrically and supersonically to a peak electron temperature of 2.3 keV, which is optimal to yield Ti K-shell x rays. Considerable enhancement of conversion efficiency [(3.7{+-}0.5)%] from incident laser energy into Ti K-shell x rays (4-6 keV band) was attained in comparison with that [(1.4{+-}0.9)%] for a planar Ti-foil target.

Tanabe, Minoru; Nishimura, Hiroaki; Fujioka, Shinsuke; Nagai, Keiji; Yamamoto, Norimasa; Mima, Kunioki [Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka 565-0871 (Japan); Gu, Zhong-Ze; Pan, Chao [State Key Laboratory of Bioelectronics, Southeast University, Nanjing, Jiangsu 210096 (China); Girard, Frederic; Primout, Michel; Villette, Bruno; Brebion, Didier [Commissariat a l'Energie Atomique, DAM-Ile-de-France, Bruyeres-le-Chatel, 91297 Arpajon, Cedex (France); Fournier, Kevin B. [Lawrence Livermore National Laboratory, P.O. Box 808, L-473, Livermore, California 94550 (United States); Fujishima, Akira [Kanagawa Academy of Science and Technology, 3-2-1 Sakato, Takatsu-ku, Kawasaki 213-0012 (Japan)

2008-08-04T23:59:59.000Z

398

Measurement of the energy resolution and calibration of hybrid pixel detectors with GaAs:Cr sensor and Timepix readout chip  

E-Print Network [OSTI]

This paper describes an iterative method of per-pixel energy calibration of hybrid pixel detectors with GaAs:Cr sensor and Timepix readout chip. A convolution of precisely measured spectra of characteristic X-rays of different metals with the resolution and the efficiency of the pixel detector is used for the calibration. The energy resolution of the detector is also measured during the calibration. The use of per-pixel calibration allows to achieve a good energy resolution of the Timepix detector with GaAs:Cr sensor: 8% and 13% at 60 keV and 20 keV, respectively.

Butler, A P; Bell, S T; Chelkov, G A; Dedovich, D V; Demichev, M A; Elkin, V G; Gostkin, M I; Kotov, S A; Kozhevnikov, D A; Kruchonak, U G; Nozdrin, A A; Porokhovoy, S Yu; Potrap, I N; Smolyanskiy, P I; Zakhvatkin, M M; Zhemchugov, A S

2015-01-01T23:59:59.000Z

399

Search for Resonant Absorption of Solar Axions Emitted in M1 Transition in $^{57}$Fe Nuclei  

E-Print Network [OSTI]

A search for resonant absorbtion of 14.4 keV solar axions by $^{57}$Fe target was performed. The Si(Li) detector placed inside the low-background setup was used to detect the $\\gamma$-quanta appearing in the deexcitation of 14.4 keV nuclear level: $A+\\rm{^{57}Fe} \\to \\rm{^{57}Fe^{*}} \\to \\rm{^{57}Fe} + \\gamma$. The new upper limit for the hadronic axion mass have been obtained: $m_{A} \\leq 151$ eV (90% C.L.) ($S$=0.5, $z$=0.56).

A. V. Derbin; A. I. Egorov; I. A. Mitropol'sky; V. N. Muratova; D. A. Semenov; E. V. Unzhakov

2009-06-01T23:59:59.000Z

400

REQUIREMENTS AND GUIDELINES FOR NSLS EXPERIMENTAL BEAM LINE VACUUM SYSTEMS-REVISION B.  

SciTech Connect (OSTI)

Typical beam lines are comprised of an assembly of vacuum valves and shutters referred to as a ''front end'', optical elements to monochromatize, focus and split the photon beam, and an experimental area where a target sample is placed into the photon beam and data from the interaction is detected and recorded. Windows are used to separate sections of beam lines that are not compatible with storage ring ultra high vacuum. Some experimental beam lines share a common vacuum with storage rings. Sections of beam lines are only allowed to vent up to atmospheric pressure using pure nitrogen gas after a vacuum barrier is established to protect ring vacuum. The front end may only be bled up when there is no current in the machine. This is especially true on the VUV storage ring where for most experiments, windows are not used. For the shorter wavelength, more energetic photons of the x-ray ring, beryllium windows are used at various beam line locations so that the monochromator, mirror box or sample chamber may be used in a helium atmosphere or rough vacuum. The window separates ring vacuum from the environment of the downstream beam line components. The stored beam lifetime in the storage rings and the maintenance of desirable reflection properties of optical surfaces depend upon hydrocarbon-free, ultra-high vacuum systems. Storage ring vacuum systems will operate at pressures of {approximately} 1 x 10{sup {minus}10} Torr without beam and {approximately} 1 x 10{sup {minus}9} Torr with beam. Systems are free of hydrocarbons in the sense that no pumps, valves, etc. containing organics are used. Components are all-metal, chemically cleaned and bakeable. To the extent that beam lines share a common vacuum with the storage ring, the same criteria will hold for beam line components. The design philosophy for NSLS beam lines is to use all-metal, hydrocarbon-free front end components and recommend that experimenters use this approach for common vacuum hardware downstream of front ends. O-ring-sealed valves, if used, are not permitted upstream of the monochromator exit aperture. It will be the responsibility of users to demonstrate that their experiment will not degrade the pressure or quality of the storage ring vacuum. As a matter of operating policy, all beam lines will be monitored for prescribed pressure and the contribution of high mass gases to this pressure each time a beam line has been opened to ring vacuum.

FOERSTER,C.

1999-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Constrains on Dark Matter sterile neutrino resonant production in the light of Planck  

E-Print Network [OSTI]

Few independent detections of a weak X-ray emission line at an energy of ~3.5 keV seen toward a number of astrophysical sites have been reported. If this signal will be confirmed to be the signature of decaying DM sterile neutrino with a mass of ~7.1 keV, then the cosmological observables should be consistent with its properties. We compute the radiation and matter perturbations including the full resonance sweep solution for active - sterile neutrino flavor conversion and place constraints on the cosmological parameters and sterile neutrino properties by using most of the present cosmological measurements. We find the sterile neutrino upper limits for mass and mixing angle of 7.86 keV (equivalent to 2.54 keV thermal mass) and 9.41 x 10^{-9} (at 95% CL) respectively, for a lepton number per flavor of 0.0042, that is significantly higher than that inferred in Abazajian (2014) from the linear large scale structure constraints. This reflects the sensitivity of the high precision CMB anisotropies to the helium ab...

Popa, L A; Tonoiu, D

2015-01-01T23:59:59.000Z

402

Note: A real-time beam current density meter  

SciTech Connect (OSTI)

We have developed a real-time beam current density meter for charged particle beams. It measures the mean current density by collimating a uniform and large diameter primary beam. The suppression of the secondary electrons and the deflection of the beam were simulated, and it was tested with a 105 keV Ar{sup 7+} ion beam.

Liu Junliang; Yu Deyang; Ruan Fangfang; Xue Yingli; Wang Wei [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)

2013-03-15T23:59:59.000Z

403

ccsd00001553, CONTRIBUTION OF POINT SOURCES TO THE SOFT -RAY GALACTIC EMISSION  

E-Print Network [OSTI]

EMISSION R. Terrier 1 , F. Lebrun 2 , G. B#19;elanger 2 , A. Goldwurm 2 , A. W. Strong 3 , V. Schoenfelder-200 keV) Galactic emission has been a matter of debate for a long time. Previous experiments have tried to sep- arate the point source contribution from the real in- terstellar emission, but with a rather poor

404

Anomalous emissions of 103mRh biphoton transitions  

E-Print Network [OSTI]

In this report, the anomalous emissions, centered on the one half transition energy 39.76/2 keV, are observed from the long-lived Mossbauer state of 103mRh excited by bremsstrahlung exposure. Strong coupling with identical nuclei in Rh crystals opens cascade channels for biphoton transitions.

Yao Cheng; Bing Xia

2009-08-06T23:59:59.000Z

405

The Solar Wind Charge-Exchange Production Factor for Hydrogen  

E-Print Network [OSTI]

The production factor, or broad band averaged cross-section, for solar wind charge-exchange with hydrogen producing emission in the ROSAT 1/4 keV (R12) band is $3.8\\pm0.2\\times10^{-20}$ count degree$^{-2}$ cm$^4$. This value is derived from a comparison of the Long-Term (background) Enhancements in the ROSAT All-Sky Survey with magnetohysdrodynamic simulations of the magnetosheath. This value is 1.8 to 4.5 times higher than values derived from limited atomic data, suggesting that those values may be missing a large number of faint lines. This production factor is important for deriving the exact amount of 1/4 keV band flux that is due to the Local Hot Bubble, for planning future observations in the 1/4 keV band, and for evaluating proposals for remote sensing of the magnetosheath. The same method cannot be applied to the 3/4 keV band as that band, being composed primarily of the oxygen lines, is far more sensitive to the detailed abundances and ionization balance in the solar wind. We also show, incidentally,...

Kuntz, K D; Collier, M R; Connor, H K; Cravens, T E; Koutroumpa, D; Porter, F S; Robertson, I P; Sibeck, D G; Snowden, S L; Thomas, N E; Wash, B M

2015-01-01T23:59:59.000Z

406

Ann. Geophysicae 15, 542--552 (1997) EGS --Springer-Verlag 1997 First results from the plasma composition spectrometer PROMICS-3  

E-Print Network [OSTI]

for the transport of solar wind energy, mass, and momentum to the Earth's magnetosphere as well as the accumulation, Finland Received: 3 January 1996/Revised: 13 May 1996/Accepted: 27 May 1996 Abstract. PROMICS-3) measurements of ions in the energy range 4 eV--70 keV with mass separation and of electrons in the energy range

Boyer, Edmond

407

Annales Geophysicae, 23, 18391847, 2005 SRef-ID: 1432-0576/ag/2005-23-1839  

E-Print Network [OSTI]

-00101 Helsinki, Finland 2Institute of Physics, University of St.-Petersburg, St.-Petersburg, 198904- tributions with energies of 31­80 keV were analyzed to de- termine the locations where anisotropic pitch-altitudes. Magnetic field mapping using the Tsyganenko T01 model with the observed solar wind input parameters showed

Boyer, Edmond

408

Planetary and Space Science 55 (2007) 17721792 The Analyser of Space Plasmas and Energetic Atoms (ASPERA-4)  

E-Print Network [OSTI]

, Finland i Finnish Meteorological Institute, Box 503, FIN-00101 Helsinki, Finland j Space Physics Research objective of the ASPERA-4 (Analyser of Space Plasmas and Energetic Atoms) experiment is to study the solar flux (0.1­60 keV) with no mass and energy resolution but relatively high angular resolution

California at Berkeley, University of

409

Annales Geophysicae (2001) 19: 13551366 c European Geophysical Society 2001 Geophysicae  

E-Print Network [OSTI]

-114, Hungary 11NUI, Maynooth-Co., Kildare, Ireland 12University of Oulu, 90571 Oulu, Finland 13Peking, A, over an energy range from 30 keV up to 1.5 MeV. We present the first measurements taken by RAPID was travelling from a perigee near dawn northward across the pole towards an apogee in the solar wind, is used

Paris-Sud XI, Université de

410

Forecast of the arrival of interplanetary shocks by measuring cosmic ray fluctuations in the interplanetary  

E-Print Network [OSTI]

interplanetary shocks, for which a large flux of low-energy particles (10 keV - 10 MeV) of solar. of Physics, University of Oulu, Finland E-mail: ilya.usoskin@oulu.fi Abstract. Here we present a method cosmic ray fluctuations and solar wind parameters measured onboard the ACE spacecraft. The method

Usoskin, Ilya G.

411

Dynamics of Ion Beam Stimulated Surface Mass Transport to Nanopores David P. Hoogerheide1  

E-Print Network [OSTI]

Dynamics of Ion Beam Stimulated Surface Mass Transport to Nanopores David P. Hoogerheide1 membrane, from the substrate side, by rastering a 10-nm diameter, 50 keV gallium ion beam produced by a FEI We explore the ion beam-induced dynamics of the formation of large features at the edges of nanopores

412

all-sky monitor wam: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

for the hard X-rays and the wide-field of view make the WAM an ideal detector for gamma-ray bursts (GRBs) observations in the energy range of 50-5000 keV. In fact, the WAM has...

413

Spent Nuclear Fuel Self-Induced XRF to Predict Pu to U Content  

E-Print Network [OSTI]

) in July 2008 and January 2009. These measurements successfully showed that it is possible to measure the Pu x-ray peak at 103.7 keV in PWR spent fuel (~1 percent Pu) using a planar HPGe detector. Prior to these measurement campaigns, the Pu peak has only...

Stafford, Alissa Sarah

2010-10-12T23:59:59.000Z

414

Reference Radiation for Cosmic Rays in RBE Research  

E-Print Network [OSTI]

effectiveness relative to a specific radiation is usually used. For low energy heavy ions and neutrons 250 keV photons are usually used for the reference radiation but their depth dose distribution is very different from that for cosmic rays. In this research...

Feng, Shaoyong

2011-10-21T23:59:59.000Z

415

Xray CCD Calibration for the AXAF CCD Imaging Spectrometer M. Bautz, S. Kissel, G. Prigozhin, S. Jones, T. Isobe,  

E-Print Network [OSTI]

. Jones, T. Isobe, H. Manning, M. Pivovaroff, G. Ricker and J. Woo 1 Massachusetts Institute of TechnologyV and 10 keV. The very demanding calibration requirements (energy scale knowledge error of order 0 of the detector response which it is the objective of the calibration enterprise to constrain. The accuracy

416

NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9  

E-Print Network [OSTI]

We present NuSTAR high-energy X-ray observations of the pulsar wind nebula (PWN)/supernova remnant G21.5–0.9. We detect integrated emission from the nebula up to ~40 keV, and resolve individual spatial features over a broad ...

Nynka, Melania

417

A versatile facility for the calibration of X-ray polarimeters with polarized and unpolarized controlled beams  

E-Print Network [OSTI]

We devised and built a versatile facility for the calibration of the next generation X-ray polarimeters with unpolarized and polarized radiation. The former is produced at 5.9 keV by means of a Fe55 radioactive source or by X-ray tubes, while the latter is obtained by Bragg diffraction at nearly 45 degrees. Crystals tuned with the emission lines of X-ray tubes with molybdenum, rhodium, calcium and titanium anodes are employed for the efficient production of highly polarized photons at 2.29, 2.69, 3.69 and 4.51 keV respectively. Moreover the continuum emission is exploited for the production of polarized photons at 1.65 keV and 2.04 keV and at energies corresponding to the higher orders of diffraction. The photons are collimated by means of interchangeable capillary plates and diaphragms, allowing a trade-off between collimation and high fluxes. The direction of the beam is accurately arranged by means of high precision motorized stages, controlled via computer so that long and automatic measurements can be done. Selecting the direction of polarization and the incidence point we can map the response of imaging devices to both polarized and unpolarized radiation. Changing the inclination of the beam we can study the systematic effects due to the focusing of grazing incidence optics and the feasibility of instruments with large field of view.

Fabio Muleri; Paolo Soffitta; Ronaldo Bellazzini; Alessandro Brez; Enrico Costa; Massimo Frutti; Marcello Mastropietro; Ennio Morelli; Michele Pinchera; Alda Rubini; Gloria Spandre

2008-10-15T23:59:59.000Z

418

*Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the Un  

E-Print Network [OSTI]

, NM, 87545 INTRODUCTION The Working Party on International Nuclear Data Evaluation Co-operation (WPEC-section in the energy range 0.1 to 2.25 keV.[1] The WPEC criticality calculation results indicated an overestimationV. The impact of the new evaluation in benchmark calculations was done for the critical benchmark sensitive

Danon, Yaron

419

Ejection of Neutral Molecules from Ion-bombarded Organic Surfaces  

E-Print Network [OSTI]

. In the present study, time-of-flight and energy distribu- tions of various neutral molecules ejected upon keV ionEjection of Neutral Molecules from Ion- bombarded Organic Surfaces Reema Chatterjee, Donald E, 184 Materials Research Institute Building, University Park, PA 16802, USA Time-of-flight distributions

Zbigniew, Postawa

420

Journal of Electron Spectroscopy and Related Phenomena 181 (2010) 135139 Contents lists available at ScienceDirect  

E-Print Network [OSTI]

beam energy exhibits multiple peaks at positions which depend on the nuclear mass of the elements, 2.25 keV incident energy, 20 a.u.). The peak positions agree completely with those predicted of energy and momentum in binary collisions of the incident parti- cle within the assumption

Hitchcock, Adam P.

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Instituto Nacional de Pesquisas Espaciais -Laboratrio Associado de Plasma 1 Project ELISA  

E-Print Network [OSTI]

An Electrostatic Energy Analyzer for EQUARS Renato Dallaqua, Ing Hwie Tan, Maria Virginia Alves, Edson del Bosco 2 the energy spectrum of (0.1- 40) keV electrons Scientific Objectives: 1. Electron Precipitation in the South;Instituto Nacional de Pesquisas Espaciais - Laboratório Associado de Plasma 3 The electrostatic Energy

422

Astrofisica e particelle elementari Bruno Borgia  

E-Print Network [OSTI]

energia del vento solare: p= 30 keV; B = 0.1 gauss R = p/0.3 x B = 10 m #12;3 EFFETTO LATITUDINE · Gli elettroni del vento solare vengono intrappolati e spiraleggiano intorno alle linee di B · "Rimbalzano" nelle · La concentrazione di particelle del vento solare è sufficientemente densa da distorcere il campo

Roma "La Sapienza", Università di

423

Validating mass spectrometry measurements of nuclear materials via a non-contact volume analysis method of ion sputter craters  

SciTech Connect (OSTI)

A combination of secondary ion mass spectrometry, optical profilometry and a statistically-driven algorithm was used to develop a non-contact volume analysis method to validate the useful yields of nuclear materials. The volume analysis methodology was applied to ion sputter craters created in silicon and uranium substrates sputtered by 18.5 keV O- and 6.0 keV Ar+ ions. Sputter yield measurements were determined from the volume calculations and were shown to be comparable to Monte Carlo calculations and previously reported experimental observations. Additionally, the volume calculations were used to determine the useful yields of Si+, SiO+ and SiO2+ ions from the silicon substrate and U+, UO+ and UO2+ ions from the uranium substrate under 18.5 keV O- and 6.0 keV Ar+ ion bombardment. This work represents the first steps toward validating the interlaboratory and cross-platform performance of mass spectrometry for the analysis of nuclear materials.

Willingham, David G.; Naes, Benjamin E.; Fahey, Albert J.

2015-01-01T23:59:59.000Z

424

A&A 450, 5968 (2006) DOI: 10.1051/0004-6361:20054172  

E-Print Network [OSTI]

-ray flare in XRF 050406: evidence for prolonged engine activity P. Romano1, A. Moretti1, P. L. Banat1, D. N observations of XRF 050406, the first burst detected by Swift showing a flare in its X-ray light curve. During 2.65), no significant flux above 50 keV and a peak energy Ep XRF 050406 is one

Zhang, Bing

425

Confirmation of the $\\eps$ -- $\\eiso$ (Amati) relation from the X-ray flash XRF 050416A observed by Swift/BAT  

E-Print Network [OSTI]

We report Swift Burst Alert Telescope (BAT) observations of the X-ray Flash (XRF) XRF 050416A. The fluence ratio between the 15-25 keV and 25-50 keV energy bands of this event is 1.5, thus making it the softest gamma-ray burst (GRB) observed by BAT so far. The spectrum is well fitted by the Band function with E^{\\rm obs}_{\\rm peak} of 15.0_{-2.7}^{+2.3} keV. Assuming the redshift of the host galaxy (z = 0.6535), the isotropic-equivalent radiated energy E_{\\rm iso} and the peak energy at the GRB rest frame (E^{\\rm src}_{\\rm peak}) of XRF 050416A are not only consistent with the correlation found by Amati et al. and extended to XRFs by Sakamoto et al., but also fill-in the gap of this relation around the 30 - 80 keV range of E^{\\rm src}_{\\rm peak}. This result tightens the validity of the E^{\\rm src}_{\\rm peak} - E_{\\rm iso} relation from XRFs to GRBs. We also find that the jet break time estimated using the empirical relation between E^{\\rm src}_{\\rm peak} and the collimation corrected energy E_{\\gamma} is inc...

Sakamoto, T; Barthelmy, S D; Cummings, J R; Fenimore, E E; Gehrels, N; Hullinger, D; Krimm, H A; Markwardt, C B; Palmer, D M; Parsons, A M; Sato, G; Tüller, J

2006-01-01T23:59:59.000Z

426

Direct x-ray constraints on sterile neutrino warm dark matter  

SciTech Connect (OSTI)

Warm dark matter might more easily account for small scale clustering measurements than the heavier particles typically invoked in {lambda} cold dark matter ({lambda}CDM) cosmologies. In this paper, we consider a {lambda}WDM cosmology in which sterile neutrinos {nu}{sub s}, with a mass m{sub s} of roughly 1-100 keV, are the dark matter. We use the diffuse x-ray spectrum (total minus resolved point source emission) of the Andromeda galaxy to constrain the rate of sterile neutrino radiative decay: {nu}{sub s}{yields}{nu}{sub e,{mu}}{sub ,{tau}}+{gamma}. Our findings demand that m{sub s}<3.5 keV (95% C.L.) which is a significant improvement over the previous (95% C.L.) limits inferred from the x-ray emission of nearby clusters, m{sub s}<8.2 keV (Virgo A) and m{sub s}<6.3 keV (Virgo A+Coma)

Watson, Casey R.; Yueksel, Hasan [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Beacom, John F.; Walker, Terry P. [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Department of Astronomy, Ohio State University, Columbus, Ohio 43210 (United States)

2006-08-01T23:59:59.000Z

427

JOURNAL DE PHYSIQUE Colloque C6, suppliment au no 12, Tome 37, De'cembre 1976, page C6-693 MOSSBAUER EXPERIMENTS WITH HIGH ENERGY  

E-Print Network [OSTI]

-693 MOSSBAUER EXPERIMENTS WITH HIGH ENERGY GAMMA RAYS :THE 158 keV TRANSITION IN lg9Hg(*) W. KOCH, F. E. WAGNERV transition in lg9Hg presents particular difficulties, mainly due to the inherently low effective Debye electronics, one can hardly increase the countrate above several times lo6 s-I [I]. Higher rates of events

Paris-Sud XI, Université de

428

THE SWIFT GAMMA-RAY BURST MISSION N. Gehrels,1  

E-Print Network [OSTI]

�1 in the 15­150 keV band), more than an order of magnitude better than HEAO 1 A-4. A flexible data finding charts. Redshift determinations will be made for most bursts. In addition to the primary GRB

Smith, Ian Andrew

429

Application of coincidence ion mass spectrometry for chemical and structural analysis at the sub-micron scale  

E-Print Network [OSTI]

Surfaces can be probed with a variant of secondary ion mass spectrometry (SIMS) where the bombardment is with a sequence of single keV projectiles, each resolved in time and space, coupled with the separate record of the secondary ions (SIs) ejected...

Balderas, Sara

2005-11-01T23:59:59.000Z

430

Prospects for SIMPLE 2000: a large-mass, low-background superheated droplet detector  

E-Print Network [OSTI]

CERN, EP Division, CH-1211 Gen`eve 23, Switzerland 3 Centro de F´isica Nuclear, Universidade de Lisboa dosimetry become possible. In the moderately superheated liquids used in SDDs, bubbles can be produced only by particles having elevated stopping powers (dE/dx 200 keV µm-1 ) as is the case for low- energy nuclear

Collar, Juan I.

431

Geophysical Laboratory/CDAC*Geophysical Laboratory/CDAC* Carnegie Institution of WashingtonCarnegie Institution of Washington  

E-Print Network [OSTI]

advantages has been tapped for high-pressure geoscience · Brilliance · High energy · Energy resolution and bodies outside our solar system · New observations and space missions · Implications for life elsewhere, with the discovery..." The Physics of High Pressure" (1931). #12;2 x 2.5 mm diamonds Radial Energy (keV) Axial 2 mm

Hemley, Russell J.

432

Calibration of the Accuscan II In Vivo System for Whole Body Counting  

SciTech Connect (OSTI)

This report describes the April 2011 calibration of the Accuscan II HpGe In Vivo system for whole body counting. The source used for the calibration was a NIST traceable BOMAB manufactured by DOE as INL2006 BOMAB containing Eu-154, Eu-155, Eu-152, Sb-125 and Y-88 with energies from 27 keV to 1836 keV with a reference date of 11/29/2006. The actual usable energy range was 86.5 keV to 1597 keV on 4/21/2011. The BOMAB was constructed inside the Accuscan II counting 'tub' in the order of legs, thighs, abdomen, thorax/arms, neck, and head. Each piece was taped to the backwall of the counter. The arms were taped to the thorax. The phantom was constructed between the v-ridges on the backwall of the Accuscan II counter. The energy and efficiency calibrations were performed using the INL2006 BOMAB. The calibrations were performed with the detectors in the scanning mode. This report includes an overview introduction and records for the energy/FWHM and efficiency calibration including performance verification and validation counting. The Accuscan II system was successfully calibrated for whole body counting and verified in accordance with ANSI/HPS N13.30-1996 criteria.

Orval R. Perry; David L. Georgeson

2011-08-01T23:59:59.000Z

433

X-Ray cavities and temperature jumps in strong cool core cluster Abell 2390  

E-Print Network [OSTI]

We present results based on the systematic analysis of high resolution 95\\,ks \\textit{Chandra} observations of the strong cool core cluster Abell 2390 at the redshift of z = 0.228, which hosts an energetic radio AGN. This analysis has enabled us to investigate five X-ray deficient cavities in the hot atmosphere of Abell 2390 within central 30\\arcsec, three of which are newly detected. Presence of these cavities have been confirmed through a various image processing techniques like, the surface brightness profiles, unsharp masked image, as well as 2D elliptical model subtracted residual map. Temperature profile as well as 2D temperature map revealed structures in the distribution of ICM, in the sense that ICM in NW direction is relatively cooler than that on the SE direction. Two temperature jumps, one from 6\\,keV to 9.25\\,keV at 72 kpc on the north direction, and the other from 6\\,keV to 10.27\\,keV at 108 kpc in the east direction have been observed. These temperature jumps are associated with the shocks with...

Sonkamble, S S; Pawar, P K; Patil, M K

2014-01-01T23:59:59.000Z

434

A&A 458, 641651 (2006) DOI: 10.1051/0004-6361:20065809  

E-Print Network [OSTI]

keV by enhanced trapping through an electric potential. Conclusions. The model proposed here accounts the physical processes involved. Most of the proposed models fall into three broad classes: electric DC field for the modification of the electron spectrum from the time they leave the accelerator until they reach the har

435

Earth Planets Space, 00, 000--000, 2000 Solar Flare Mechanism Based on Magnetic Arcade  

E-Print Network [OSTI]

Earth Planets Space, 00, 000--000, 2000 Solar Flare Mechanism Based on Magnetic Arcade Reconnection, Princeton, NJ 08543­0451 (Received ; Revised ; Accepted ) We propose a model describing physical processes is large enough to accelerate electrons to an energy level higher than 10 keV, which is necessary

436

The Astrophysical Journal, 722:17351743, 2010 October 20 doi:10.1088/0004-637X/722/2/1735 C 2010. The American Astronomical Society. All rights reserved. Printed in the U.S.A.  

E-Print Network [OSTI]

or continuously supplied to cluster cores to prevent the formation of cooling flows. A primary candidate--REHEATING THE COOL CORE OF A 3 keV CLUSTER FROM A NUCLEAR OUTBURST at z = 0.246 D. V. Lal1 , R. P. Kraft1 merger event. The temperature across the discontinuities is roughly constant with no signature of a cool

Evans, Dan

437

Improvement of the Energy Resolution via an Optimized Digital Signal Processing in GERDA Phase I  

E-Print Network [OSTI]

An optimized digital shaping filter has been developed for the GERDA experiment which searches for neutrinoless double beta decay in 76Ge. The GERDA Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) at the 76Ge Q value for 0\

Agostini, M; Bakalyarov, A M; Balata, M; Barabanov, I; Barros, N; Baudis, L; Bauer, C; Becerici-Schmidt, N; Bellotti, E; Belogurov, S; Belyaev, S T; Benato, G; Bettini, A; Bezrukov, L; Bode, T; Borowicz, D; Brudanin, V; Brugnera, R; Budjáš, D; Caldwell, A; Cattadori, C; Chernogorov, A; D'Andrea, V; Demidova, E V; di Vacri, A; Domula, A; Doroshkevich, E; Egorov, V; Falkenstein, R; Fedorova, O; Freund, K; Frodyma, N; Gangapshev, A; Garfagnini, A; Grabmayr, P; Gurentsov, V; Gusev, K; Hegai, A; Heisel, M; Hemmer, S; Heusser, G; Hofmann, W; Hult, M; Inzhechik, L V; Csáthy, J Janicskó; Jochum, J; Junker, M; Kazalov, V; Kihm, T; Kirpichnikov, I V; Kirsch, A; Klimenko, A; Knöpfle, K T; Kochetov, O; Kornoukhov, V N; Kuzminov, V V; Laubenstein, M; Lazzaro, A; Lebedev, V I; Lehnert, B; Liao, H Y; Lindner, M; Lippi, I; Lubashevskiy, A; Lubsandorzhiev, B; Lutter, G; Macolino, C; Majorovits, B; Maneschg, W; Medinaceli, E; Misiaszek, M; Moseev, P; Nemchenok, I; Palioselitis, D; Panas, K; Pandola, L; Pelczar, K; Pullia, A; Riboldi, S; Rumyantseva, N; Sada, C; Salathe, M; Schmitt, C; Schneider, B; Schönert, S; Schreiner, J; Schütz, A -K; Schulz, O; Schwingenheuer, B; Selivanenko, O; Shirchenko, M; Simgen, H; Smolnikov, A; Stanco, L; Stepaniuk, M; Ur, C A; Vanhoefer, L; Vasenko, A A; Veresnikova, A; von Sturm, K; Wagner, V; Walter, M; Wegmann, A; Wester, T; Wilsenach, H; Wojcik, M; Yanovich, E; Zavarise, P; Zhitnikov, I; Zhukov, S V; Zinatulina, D; Zuber, K; Zuzel, G

2015-01-01T23:59:59.000Z

438

Improvement of the Energy Resolution via an Optimized Digital Signal Processing in GERDA Phase I  

E-Print Network [OSTI]

An optimized digital shaping filter has been developed for the GERDA experiment which searches for neutrinoless double beta decay in 76Ge. The GERDA Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) at the 76Ge Q value for 0\

M. Agostini; M. Allardt; A. M. Bakalyarov; M. Balata; I. Barabanov; N. Barros; L. Baudis; C. Bauer; N. Becerici-Schmidt; E. Bellotti; S. Belogurov; S. T. Belyaev; G. Benato; A. Bettini; L. Bezrukov; T. Bode; D. Borowicz; V. Brudanin; R. Brugnera; D. Budjáš; A. Caldwell; C. Cattadori; A. Chernogorov; V. D'Andrea; E. V. Demidova; A. di Vacri; A. Domula; E. Doroshkevich; V. Egorov; R. Falkenstein; O. Fedorova; K. Freund; N. Frodyma; A. Gangapshev; A. Garfagnini; P. Grabmayr; V. Gurentsov; K. Gusev; A. Hegai; M. Heisel; S. Hemmer; G. Heusser; W. Hofmann; M. Hult; L. V. Inzhechik; J. Janicskó Csáthy; J. Jochum; M. Junker; V. Kazalov; T. Kihm; I. V. Kirpichnikov; A. Kirsch; A. Klimenko; K. T. Knöpfle; O. Kochetov; V. N. Kornoukhov; V. V. Kuzminov; M. Laubenstein; A. Lazzaro; V. I. Lebedev; B. Lehnert; H. Y. Liao; M. Lindner; I. Lippi; A. Lubashevskiy; B. Lubsandorzhiev; G. Lutter; C. Macolino; B. Majorovits; W. Maneschg; E. Medinaceli; M. Misiaszek; P. Moseev; I. Nemchenok; D. Palioselitis; K. Panas; L. Pandola; K. Pelczar; A. Pullia; S. Riboldi; N. Rumyantseva; C. Sada; M. Salathe; C. Schmitt; B. Schneider; S. Schönert; J. Schreiner; A. -K. Schütz; O. Schulz; B. Schwingenheuer; O. Selivanenko; M. Shirchenko; H. Simgen; A. Smolnikov; L. Stanco; M. Stepaniuk; C. A. Ur; L. Vanhoefer; A. A. Vasenko; A. Veresnikova; K. von Sturm; V. Wagner; M. Walter; A. Wegmann; T. Wester; H. Wilsenach; M. Wojcik; E. Yanovich; P. Zavarise; I. Zhitnikov; S. V. Zhukov; D. Zinatulina; K. Zuber; G. Zuzel

2015-02-15T23:59:59.000Z

439

MISSION IONIQUE SECONDAIRE DES ALLIAGES CUIVRE-ALUMINIUM EN PRSENCE D'OXYGNE  

E-Print Network [OSTI]

'ions Al+, ce qui prouve l'existence d'un autre mécanisme. Par ailleurs l'étude des alliages Cu-Al montre shell can be ejected from a target of aluminium by bombardment with A+ ions of several keV. Thèse atoms outside of the target and is independent of both the lattice containing the aluminium and the energy

Boyer, Edmond

440

HEAVY GOLD CLUSTER BEAMS production and identi cation  

E-Print Network [OSTI]

. This method is based on the acceleration of the clusters to high energy (MeV) and on the measurement, after to select heavy Aun cluster beams for applications at low energy (keV) in mass spectrometry. 1. Introduction, with a multianode detector 7], the number of constituents coming out of the foil. High energy clusters, accelerated

Boyer, Edmond

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Laser Desorption of Large Molecules: Mechanisms and Models  

E-Print Network [OSTI]

sought intensively. Medium (keV) and high (MeV) energy ions or atoms impinging on a solid surface turned of the scope of investigations. This was especially true in mass spectrometry, where the separation as a possible way to promote vaporization over decomposition [1,2]. Pyrolysis mass spectrometry was the first

Vertes, Akos

442

University of Virginia, Dept. of Materials Science and Engineering Topic 8a -FIB  

E-Print Network [OSTI]

, high energy (30 keV) Ga+ ions are focused into spots as small as 10 nm to form pixel-by-pixel images. q;University of Virginia, Dept. of Materials Science and Engineering Dynamic Secondary Ion Mass Spectrometry (Dynamic SIMS) · In Secondary Ion Mass Spectrometry (SIMS), a solid specimen, placed in a vacuum

Moeck, Peter

443

Big molecule ejectionSIMS vs. MALDI B.J. Garrisona,*  

E-Print Network [OSTI]

events in the surface region. A high energy (5±25 keV) primary particle strikes the surface in SIMS in mass limits in secondary ion mass spectrometry (SIMS) and matrix assisted laser desorption ionization). In some respects, the two processes appear quite similar as both are initiated by fast energy deposition

Zhigilei, Leonid V.

444

Accretion, fluorescent X-ray emission and flaring magnetic structures in YSOs  

E-Print Network [OSTI]

I present some recent developments on high-energy phenomena in YSOs, concentrating on the new evidence for accretion-induced X-ray emission in YSOs, for Fe 6.4 keV fluorescent emission from the disks of YSOs and for very long magnetic structures responsible for intense X-ray flares, likely connecting the star and the circumstellar disk.

F. Favata

2004-12-20T23:59:59.000Z

445

Sub-mm and X-ray background two unrelated phenomena?  

E-Print Network [OSTI]

Obscured AGNs are thought to contribute a large fraction of the hard X-ray background (2-10 keV), and have also been proposed as the powerhouse of a fraction of the SCUBA sources which make most of the background at 850um, thus providing a link between the two spectral windows. We have tackled this issue by comparing data at 2-10 keV and at 850um for a sample of 34 sources at fluxes (or limiting fluxes) which resolve most of the background in the two bands. We present here new SCUBA observations, and new correlations between separate data sets retrieved from the literature. Similar correlations presented by others are added for completeness. None of the 11 hard X-ray (2-10 keV) sources has a counterpart at 850um, with the exception of a Chandra source in the SSA13 field, which is a candidate type 2, heavily absorbed QSO at high redshift. The ratios F(850um)/F(5keV) (mostly upper limits) of the X-ray sources are significantly lower than the value observed for the cosmic background. In particular, we obtain tha...

Severgnini, P; Salvati, M; Axon, D J; Cimatti, A; Fiore, F; Gilli, R; La Franca, F; Marconi, A; Matt, G; Risaliti, G; Vignali, C

2000-01-01T23:59:59.000Z

446

X-ray periodicities in sources observed by the RXTE ASM  

E-Print Network [OSTI]

The X-ray intensities measured from 230 X-ray sources observed by the RXTE All-Sky Monitor (ASM) were analyzed for periodic behavior. The ASM has been observing sources for nine years in the 1.5-12 keV energy range. In ...

Shivamoggi, Vasudha B

2005-01-01T23:59:59.000Z

447

Observation of eta '(c) production in gamma gamma fusion at CLEO  

E-Print Network [OSTI]

) = 115.1 +/- 2.0 MeV and DeltaM(hf)(2S) = 43.1 +/- 3.4 MeV. Assuming that the eta(c) and eta(c)' have equal branching fractions to K(s)Kpi, we obtain Gamma(gammagamma)(eta(c)') = 1.3 +/- 0.6 keV....

Besson, David Zeke

2004-04-01T23:59:59.000Z

448

Transport in carbon nanotube field-effect transistors tuned using low energy electron beam This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network [OSTI]

Transport in carbon nanotube field-effect transistors tuned using low energy electron beam exposure nanotube field-effect transistors tuned using low energy electron beam exposure Jack Chan1 , Brian Burke1/334212 Abstract We have studied the effect of low energy (30 keV) electron beam exposure on carbon nanotube field

Harriott, Lloyd R.

449

POET: POlarimeters for Energetic Transients  

E-Print Network [OSTI]

POET (Polarimeters for Energetic Transients) is a Small Explorer mission concept proposed to NASA in January 2008. The principal scientific goal of POET is to measure GRB polarization between 2 and 500 keV. The payload consists of two wide FoV instruments: a Low Energy Polarimeter (LEP) capable of polarization measurements in the energy range from 2-15 keV and a high energy polarimeter (Gamma-Ray Polarimeter Experiment -- GRAPE) that will measure polarization in the 60-500 keV energy range. Spectra will be measured from 2 keV up to 1 MeV. The POET spacecraft provides a zenith-pointed platform for maximizing the exposure to deep space. Spacecraft rotation will provide a means of effectively dealing with systematics in the polarization response. POET will provide sufficient sensitivity and sky coverage to measure statistically significant polarization for up to 100 GRBs in a two-year mission. Polarization data will also be obtained for solar flares, pulsars and other sources of astronomical interest.

J. E. Hill; M. L. McConnell; P. Bloser; J. Legere; J. Macri; J. Ryan; S. Barthelmy; L. Angelini; T. Sakamoto; J. K. Black; D. H. Hartmann; P. Kaaret; B. Zhang; K. Ioka; T. Nakamura; K. Toma; R. Yamazaki; X. Wu

2008-10-14T23:59:59.000Z

450

POET: POlarimeters for Energetic Transients  

E-Print Network [OSTI]

POET (Polarimeters for Energetic Transients) is a Small Explorer mission concept proposed to NASA in January 2008. The principal scientific goal of POET is to measure GRB polarization between 2 and 500 keV. The payload consists of two wide FoV instruments: a Low Energy Polarimeter (LEP) capable of polarization measurements in the energy range from 2-15 keV and a high energy polarimeter (Gamma-Ray Polarimeter Experiment -- GRAPE) that will measure polarization in the 60-500 keV energy range. Spectra will be measured from 2 keV up to 1 MeV. The POET spacecraft provides a zenith-pointed platform for maximizing the exposure to deep space. Spacecraft rotation will provide a means of effectively dealing with systematics in the polarization response. POET will provide sufficient sensitivity and sky coverage to measure statistically significant polarization for up to 100 GRBs in a two-year mission. Polarization data will also be obtained for solar flares, pulsars and other sources of astronomical interest.

Hill, J E; Bloser, P; Legere, J; Macri, J; Ryan, J; Barthelmy, S; Angelini, L; Sakamoto, T; Black, J K; Hartmann, D H; Kaaret, Philip; Zhang, B; Ioka, K; Nakamura, T; Toma, K; Yamazaki, R; Wu, X

2008-01-01T23:59:59.000Z

451

Q value of the superallowed decay of Mg-22 and the calibration of the Na-21(p,gamma) experiment  

E-Print Network [OSTI]

The masses of the radioactive nuclei Mg-22 and Na-22 have been measured with the Canadian Penning trap on-line mass spectrometer to a precision of 3x10(-8) and 1x10(-8), respectively. A Q(EC) value of 4124.39(73) keV for the superallowed beta decay...

Savard, G.; Clark, JA; Buchinger, F.; Crawford, JE; Gulick, S.; Hardy, John C.; Hecht, AA; Iacob, VE; Lee, JKP; Levand, AF; Lundgren, BF; Scielzo, ND; Sharma, KS; Tanihata, I.; Towner, IS; Trimble, W.; Wang, JC; Wang, Y.; Zhou, Z.

2004-01-01T23:59:59.000Z

452

This content has been downloaded from IOPscience. Please scroll down to see the full text. Download details  

E-Print Network [OSTI]

. A miniaturized lithium 6+ ion source injects fast ions with energies up to 1 KeV and a double-gridded energy wind or the magnetosphere, ions can be accelerated by wave­particle interactions to high energies [1, 2

Lenstra, Arjen K.

453

John Lindl and Bruce Hammel Lawrence Livermore National Laboratory  

E-Print Network [OSTI]

Advances in Indirect Drive ICF Target Physics Presentation to 20th IAEA Fusion Energy Conference #12;NIF in Inertial Confinement Fusion Inertial Confinement Fusion uses direct or indirect drive to couple driver by cold, dense main fuel Direct Drive Hot spot (10 keV) Cold, dense main fuel (200-1000 g/cm3) Indirect

454

ST1, EAST1, ITER-100 -all exceeding ignition criterion  

E-Print Network [OSTI]

approaches to fusion plasma 3 2 Lithium Wall Fusion (LiWF) 6 3 3 Missions - 3 machines 19 4 Summary 28 Leonid, March 16-20, 2009PRINCETON PLASMA PHYSICS LABORATORY PPPL 2 #12;1 Two approaches to fusion plasma Approach 1: 1. mix the energetic (80 keV), the most capable particles with the cold stuff from walls, 2

Zakharov, Leonid E.

455

High-energy particles in the wind nebula of pulsar B1509-58 as seen by INTEGRAL  

E-Print Network [OSTI]

We present observations with the INTEGRAL/IBIS telescope of the wind nebula powered by the young pulsar B1509-58 and we discuss the spatial and spectral properties of the unpulsed emission in the 20-200 keV energy band. The source extension and orientation along the northwest-southeast axis corresponds to the jet emission seen at keV and TeV energies. The hard X-ray spectrum is consistent with the earlier Beppo-SAX measurements. It follows a power law with a photon index alpha = -2.12 pm 0.05 up to 160 keV. A possible break at this energy is found at the 2.9 sigma confidence level. The 0.1-100 keV data are consistent with synchrotron aging of pairs in the jet and yield a magnetic field strength of 22-33 muG for a bulk velocity of 0.3-0.5c. The synchrotron cut-off energy thus corresponds to a maximum electron energy of 400-730 TeV.

M. Forot; W. Hermsen; M. Renaud; P. Laurent; I. Grenier; P. Goret; B. Khelifi; L. Kuiper

2006-09-25T23:59:59.000Z

456

Titanium and germanium lined hohlraums and halfraums as multi-keV x-ray radiators  

SciTech Connect (OSTI)

As multi-keV x-ray radiators, hohlraums and halfraums with inner walls coated with metallic materials (called liner) have been tested for the first time with laser as the energy drive. For titanium, conversion efficiencies (CEs) are up to {approx}14% for emission into 4{pi}, integrating between 4.6 and 6.5 keV when a large diameter hohlraum is used. Germanium CE is {approx}0.8% into 4{pi} between 9 and 13 keV. The highest CEs have been obtained with a 1 ns squared pulse and phase plates giving laser absorption near 99%. These high CEs are due to long-lasting, good plasma conditions for multi-keV x-ray production maintained by plasma confinement inside the plastic cylinder and plasma collision leading to a burst of x rays at a time that depends on target size. As photon emitters at 4.7 keV, titanium-lined hohlraums are the most efficient solid targets and data are close to CEs for gas targets, which are considered as the upper limit for x-ray yields since their low density allows good laser absorption and low kinetics losses. As 10.3 keV x-ray emitters, exploded germanium foils give best results one order of magnitude more efficient than thick targets; doped aerogels and lined hohlraums give similar yields, about three times lower than those from exploded foils.

Girard, F.; Primout, M.; Villette, B.; Stemmler, Ph.; Jacquet, L.; Babonneau, D. [CEA, DAM, DIF, F-91297 Arpajon (France); Fournier, K. B. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)

2009-05-15T23:59:59.000Z

457

A&A 526, A49 (2011) DOI: 10.1051/0004-6361/201015752  

E-Print Network [OSTI]

catalogues derived from past and present experiments are known in the literature and allow to tackle characterisation of GRB spectra. Methods. The spectra have a time-resolution of 128 s and consist of 240 energy channels covering the 40­700 keV energy band. The 200 brightest GRBs were selected from the complete

Orlandini, Mauro

458

HIGH-ENERGY X-RAYS FROM J174545.5-285829, THE CANNONBALL: A CANDIDATE PULSAR WIND NEBULA ASSOCIATED WITH Sgr A EAST  

E-Print Network [OSTI]

We report the unambiguous detection of non-thermal X-ray emission up to 30 keV from the Cannonball, a few-arcsecond long diffuse X-ray feature near the Galactic Center, using the NuSTAR X-ray observatory. The Cannonball ...

Nynka, Melania

459

CREATED USING THE RSC ARTICLE TEMPLATE (VER. 2.1) -SEE WWW.RSC.ORG/ELECTRONICFILES FOR DETAILS ARTICLE www.rsc.org/[journal] | [journal name  

E-Print Network [OSTI]

spectrometry have relied on the quantification of 234 Th gamma emissions at ~63 keV (absolute10 intensity = 3, the 234 Th isotope has been employed to trace the feeding activity of deep sea megafauna14, 15 . Gamma-spectrometry, and (4) gamma-spectrometry50 provides simultaneous quantitative information on a host of radionuclides

Heimsath, Arjun M.

460

Determination of the stellar (n,gamma) cross section of 40Ca with accelerator mass spectrometry  

E-Print Network [OSTI]

The stellar (n,gamma) cross section of 40Ca at kT=25 keV has been measured with a combination of the activation technique and accelerator mass spectrometry (AMS). This combination is required when direct off-line counting of the produced activity is compromised by the long half-life and/or missing gamma-ray transitions. The neutron activations were performed at the Karlsruhe Van de Graaff accelerator using the quasistellar neutron spectrum of kT=25 keV produced by the 7Li(p,n)7Be reaction. The subsequent AMS measurements were carried out at the Vienna Environmental Research Accelerator (VERA) with a 3 MV tandem accelerator. The doubly magic 40Ca is a bottle-neck isotope in incomplete silicon burning, and its neutron capture cross section determines the amount of leakage, thus impacting on the eventual production of iron group elements. Because of its high abundance, 40Ca can also play a secondary role as "neutron poison" for the s-process. Previous determinations of this value at stellar energies were based on time-of-flight measurements. Our method uses an independent approach, and yields for the Maxwellian-averaged cross section at kT=30 keV a value of 30 keV= 5.73+/-0.34 mb.

I. Dillmann; C. Domingo-Pardo; M. Heil; F. Käppeler; A. Wallner; O. Forstner; R. Golser; W. Kutschera; A. Priller; P. Steier; A. Mengoni; R. Gallino; M. Paul; C. Vockenhuber

2009-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "5-16 kev monochromator" 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

Mechanism for the reduction of interstitial supersaturations in MeV-implanted silicon  

SciTech Connect (OSTI)

We demonstrate that the excess vacancies induced by a 1 MeV Si implant reduce the excess interstitials generated by a 40 keV Si implant during thermal annealing when these two implants are superimposed in silicon. It is shown that this previously observed reduction is dominated by vacancy annihilation and not by gettering to deeper interstitial-type extended defects. Interstitial supersaturations were measured using B doping superlattices (DSL) grown on a silicon-on-insulator (SOI) substrate. Implanting MeV and keV Si ions into the B DSL/SOI structure eliminated the B transient enhanced diffusion normally associated with the keV implant. The buried SiO{sub 2} layer in the SOI substrate isolates the deep interstitials-type extended defects of the MeV implant, thereby eliminating the possibility that these defects getter the interstitial excess induced by the keV Si implant. {copyright} {ital 1999 American Institute of Physics.}

Venezia, V.C. [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States); Haynes, T.E. [Solid State Division, Oak Ridge National Laboratory, MS-6048, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States)] [Solid State Division, Oak Ridge National Laboratory, MS-6048, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States); Agarwal, A. [Semiconductor Equipment Operations, Eaton Corporation, 55 Cherry Hill Drive, Beverly, Massachusetts 01915 (United States)] [Semiconductor Equipment Operations, Eaton Corporation, 55 Cherry Hill Drive, Beverly, Massachusetts 01915 (United States); Pelaz, L.; Gossmann, H.; Jacobson, D.C.; Eaglesham, D.J. [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)

1999-03-01T23:59:59.000Z

462

JournalofGeophysicalResearch: SpacePhysics RESEARCH ARTICLE  

E-Print Network [OSTI]

the radar signal returns from various ground-based radar facilities. Finally, simulated backscattered of relativistic electrons, injected from a balloon, rocket, or spacecraft could be used for field line tracing on the ATLAS-1 mission [e.g., Burch et al., 1993] included a 6.25 keV electron beam of up to 1.2 A current

463

Studies of Microflares in RHESSI Hard X-Ray, BBSO H and MDI Magnetograms  

E-Print Network [OSTI]

of the morphology of 12 microflares jointly observed by RHESSI in the energy range from 3 to 15 keV and by BBSO III radio bursts as observed by the radio spectrometer on-board WIND. Spectral fitting results Bear City, CA 92314-9672 This is an unedited preprint of an article accepted for publication

464

SOLAR PHYSICS, 2006 The May 13, 2005 Eruption: Observations, Data Analysis and Interpretation  

E-Print Network [OSTI]

V. Yurchyshyn1, C. Liu2, V. Abramenko1, J. Krall3 1Big Bear Solar Observatory, Big Bear City, CA). The primary cause of these intense storms are disturbances in the solar wind which are observed) taken at 16:42 UT. Contours show RHESSI hard Xray emission in 50100keV energy band accumulated

Yurchyshyn, Vasyl

465

Thesis for the degree Doctor of Philosophy  

E-Print Network [OSTI]

-kinetic energy was determined throughout the stagnation phase of a hot and dense imploding plasma in a puff z to form a 10-ns-duration plasma stagnating on axis. The ion kinetic energy was obtained from the Doppler mm). The ion kinetic energy was found to be 12 keV at the earliest phase of the stagnation

466

DIAGNOSIS OF DYNAMITRON ACCELERATOR FAULTS THROUGH THE OBSERVATION OF NARROW NUCLEAR RESONANCES  

E-Print Network [OSTI]

of a thermionic rectifier. The beam energy ripple, as reflected in the full width at half maximum of narrow (p,03B checks on the apparent DVM setting at the Li (p, n) threshod, for example, when converted to keV using t

Paris-Sud XI, Université de

467

UNVEILING THE NATURE OF IGR J17177–3656 WITH X-RAY, NEAR-INFRARED, AND RADIO OBSERVATIONS  

E-Print Network [OSTI]

We report on the first broadband (1-200 keV) simultaneous Chandra-INTEGRAL observations of the recently discovered hard X-ray transient IGR J17177–3656 that took place on 2011 March 22, about two weeks after the source ...

Paizis, A.

468

PREPARED FOR THE U.S. DEPARTMENT OF ENERGY, UNDER CONTRACT DE-AC02-76CH03073  

E-Print Network [OSTI]

Physics Laboratory Publications and Reports web site in Fiscal Year 2002. The home page for PPPL Reports heating by RF and neutral beam ion technology requires minimal fast ion losses. The National Spherical.4 MA, Bt0.6 T, 5 MW of neutral beam heating and 6 MW of RF heating. 80 keV neutral beam ions

469

PREPARED FOR THE U.S. DEPARTMENT OF ENERGY, UNDER CONTRACT DE-AC02-76CH03073  

E-Print Network [OSTI]

in Calendar Year 2001. The home page for PPPL Reports and Publications is: http://www.pppl.gov/pub_report/ DOE, Princeton, New Jersey 08543, USA Abstract Neutral beam (NB) heating in the National Spherical Torus auxiliary heating. NB heating experiments in NSTX began in September 2000 using up to 5 MW of 80 keV D beams

470

A NEW HIGH ENERGY RESOLUTION NEUTRON TRANSMISSION DETECTOR SYSTEM AT THE GAERTTNER LINAC LABORATORY  

E-Print Network [OSTI]

Laboratory P.O. Box 1072, Schenectady, New York 12301-1072 A new high energy resolution modular neutronA NEW HIGH ENERGY RESOLUTION NEUTRON TRANSMISSION DETECTOR SYSTEM AT THE GAERTTNER LINAC LABORATORY capabilities at the Laboratory in and above the resolved resonance energy region from 1 keV to 600 ke

Danon, Yaron

471

Optimisation of masked ion irradiation damage profiles in YBCO thin films by Monte Carlo simulation  

E-Print Network [OSTI]

Optimisation of masked ion irradiation damage profiles in YBCO thin films by Monte Carlo simulation production with a given mask structure. The results suggest that minimum ion scattering broadening tails with beam energy up to a few hundred keV, though the throughput is intrinsically low [1]. A combination

Webb, Roger P.

472

The Transport of Neutral Hydrogen Atoms in a Hydrogen Plasma R. D. M. Garcia  

E-Print Network [OSTI]

-state Boltzmann equation that describes the transport of low-energy ~,5-keV! neutral hydrogen at- omsThe Transport of Neutral Hydrogen Atoms in a Hydrogen Plasma R. D. M. Garcia HSH Scientific, 1999 Accepted March 20, 2000 Abstract ­ An analytical version of the discrete ordinates method is used

Siewert, Charles E.

473

Particle pulses from superconducting aluminum tunnel junction detectors  

SciTech Connect (OSTI)

Superconducting aluminum tunnel junctions have been developed for use as particle detectors. This paper presents results on static characteristics of these devices. We also present results from tests of these detectors with 6-keV X-rays. An extrapolation of the properties of these detectors to one suitable for dark-matter detectors is discussed.

Stricker, D.A.; Bing, D.D.; Bland, R.W.; Dickson, S.C.; Dignan, T.; Johnson, R.T.; Lockhart, J.M.; Laws, K.; Simon, M.W.; Watson, R. (San Francisco State Univ., Physics and Astronomy Dept. San Francisco, CA (US))

1991-03-01T23:59:59.000Z

474

JOURNAL DE PHYSIQUE Colloque Cl ,supplt?mentau n " 2, Tome 40, fgvrier 1979,page C1-157 SPECTROSCOPY IN THE GRAZING-INCIDENCE SPECTRAL REGION  

E-Print Network [OSTI]

-atom collisions at the 600-keV heavy-ion accelerator at Aarhus University. An ellipsoidal, gold-coated mirror ARRANGEMENT The experimental arrangement is shown schematically in Fig. 1 . A gold-coated, el- lipsoidal. This was accomplished by installing a shaft encoder (LOGIK, Denmark) on the drive shaft, connect- ing the gear box

Paris-Sud XI, Université de

475

ELECTRONIC STRUCTURE IN METALS AND ALLOYS. ELECTRONIC STRUCTURE OF THE LIGHT ACTINIDES  

E-Print Network [OSTI]

ELECTRONIC STRUCTURE IN METALS AND ALLOYS. ELECTRONIC STRUCTURE OF THE LIGHT ACTINIDES B. D. DUNLAP electrons. A review is given of some areas of current interest, especially where hyperfine techniques have the 60 keV y-ray of 237Np[l]. At that time, our understanding of the electronic properties

Boyer, Edmond

476

JOURNAL DE PHYSIQUE Colloque C2, suppldment au no 7 , Tome 38, Juillet 1977, page C2-53 ELECTRON DIFFRACTION STUDIES OF CLUSTERS FORMED  

E-Print Network [OSTI]

JOURNAL DE PHYSIQUE Colloque C2, suppldment au no 7 , Tome 38, Juillet 1977, page C2-53 ELECTRON scattering chamber where the beam is crossed with a 40 keV electron beam. Diffraction patterns from electron can produce many photons, single photon noise events can be discriminated against using a pulse

Boyer, Edmond

477

Neutron Transmission, Capture, and Scattering Measurements at the Gaerttner LINAC Center Y. Danon, L. Liu, E.J. Blain, A.M. Daskalakis, B.J. McDermott, K. Ramic, C.R. Wendorff  

E-Print Network [OSTI]

Neutron Transmission, Capture, and Scattering Measurements at the Gaerttner LINAC Center Y. Danon . As the energy of the neutrons increases to the keV region neutron resonance scattering becomes dominant compared to capture, and scattered neutrons can penetrate the 10 B4C liner of the NaI capture detector and get

Danon, Yaron

478

RUSSIAN ACADEMY OF SCIENCE G.I. BUDKER INSTITUTE OF NUCLEAR PHYSICS  

E-Print Network [OSTI]

RUSSIAN ACADEMY OF SCIENCE G.I. BUDKER INSTITUTE OF NUCLEAR PHYSICS SIBERIAN BRANCH I.I. Averbukh.V. Shikhovtseva,b a Budker Institute of Nuclear Physics b Novosibirsk State University 630090, Novosibirsk, Russia- tained during the ion source testing. 70 mA, 50 keV .. , .. , .. a,b , .. a,b , .. a

479

Physics Letters B 584 (2004) 260268 www.elsevier.com/locate/physletb  

E-Print Network [OSTI]

of neutrinoless double beta decay is 0.2 counts keV-1 kg-1 y-1, among the lowest in this type of experiment. No evidence for neutrinoless double beta decay is found with the present statistics obtained in about three double beta decay of 130Te with the calorimetric CUORICINO experiment C. Arnaboldi a , D.R. Artusa b , F

480

Tuning Nanoelectromechanical Resonators with Mass Migration  

E-Print Network [OSTI]

on the outer surface of the MWNT or in the hollow region within its core. Mass redistribution along (TEM) operated at 100 keV, equipped with a nanomanipulation platform (Nano- factory Instruments AB nm. NANO LETTERS 2009 Vol. 9, No. 9 3209-3213 10.1021/nl901449w CCC: $40.75 2009 American Chemical

Zettl, Alex

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481

Measurement and analysis of the Am-243 neutron capture cross section at the n_TOF facility at CERN  

E-Print Network [OSTI]

Background:The design of new nuclear reactors and transmutation devices requires to reduce the present neutron cross section uncertainties of minor actinides. Purpose: Reduce the $^{243}$Am(n,$\\gamma$) cross section uncertainty. Method: The $^{243}$Am(n,$\\gamma$) cross section has been measured at the n_TOF facility at CERN with a BaF$_{2}$ Total Absorption Calorimeter, in the energy range between 0.7 eV and 2.5 keV. Results: The $^{243}$Am(n,$\\gamma$) cross section has been successfully measured in the mentioned energy range. The resolved resonance region has been extended from 250 eV up to 400 eV. In the unresolved resonance region our results are compatible with one of the two incompatible capture data sets available below 2.5 keV. The data available in EXFOR and in the literature has been used to perform a simple analysis above 2.5 keV. Conclusions: The results of this measurement contribute to reduce the $^{243}$Am(n,$\\gamma$) cross section uncertainty and suggest that this cross section is underestimated up to 25% in the neutron energy range between 50 eV and a few keV in the present evaluated data libraries.

n_TOF Collaboration; :; E. Mendoza; D. Cano-Ott; C. Guerrero; E. Berthoumieux; U. Abbondanno; G. Aerts; F. Alvarez-Velarde; S. Andriamonje; J. Andrzejewski; P. Assimakopoulos; L. Audouin; G. Badurek; J. Balibrea; P. Baumann; F. Becvar; F. Belloni; F. Calvino; M. Calviani; R. Capote; C. Carrapico; A. Carrillo de Albornoz; P. Cennini; V. Chepel; E. Chiaveri; N. Colonna; G. Cortes; A. Couture; J. Cox; M. Dahlfors; S. David; I. Dillmann; R. Dolfini; C. Domingo-Pardo; W. Dridi; I. Duran; C. Eleftheriadis; L. Ferrant; A. Ferrari; R. Ferreira-Marques; L. Fitzpatrick; H. Frais-Koelbl; K. Fujii; W. Furman; I. Goncalves; E. Gonzalez-Romero; A. Goverdovski; F. Gramegna; E. Griesmayer; F. Gunsing; B. Haas; R. Haight; M. Heil; A. Herrera-Martinez; M. Igashira; S. Isaev; E. Jericha; F. Kappeler; Y. Kadi; D. Karadimos; D. Karamanis; V. Ketlerov; M. Kerveno; P. Koehler; V. Konovalov; E. Kossionides; M. Krticka; C. Lampoudis; H. Leeb; A. Lindote; I. Lopes; R. Lossito; M. Lozano; S. Lukic; J. Marganiec; L. Marques; S. Marrone; T. Martinez; C. Massimi; P. Mastinu; A. Mengoni; P. M. Milazzo; C. Moreau; M. Mosconi; F. Neves; H. Oberhummer; S. O Brien; M. Oshima; J. Pancin; C. Papachristodoulou; C. Papadopoulos; C. Paradela; N. Patronis; A. Pavlik; P. Pavlopoulos; L. Perrot; M. T. Pigni; R. Plag; A. Plompen; A. Plukis; A. Poch; J. Praena; C. Pretel; J. Quesada; T. Rauscher; R. Reifarth; M. Rosetti; C. Rubbia; G. Rudolf; P. Rullhusen; J. Salgado; C. Santos; L. Sarchiapone; I. Savvidis; C. Stephan; G. Tagliente; J. L. Tain; L. Tassan-Got; L. Tavora; R. Terlizzi; G. Vannini; P. Vaz; A. Ventura; D. Villamarin; M. C. Vicente; V. Vlachoudis; R. Vlastou; F. Voss; S. Walter; H. Wendler; M. Wiescher; K. Wisshak

2014-12-04T23:59:59.000Z

482

Global X-ray emission during an isolated substorm -A case study N. stgaard,1  

E-Print Network [OSTI]

respond to the total electron energy flux which is usually dominated by low-energy electrons ( and visible emissions are proportional to the total electron energy flux which is usually dominated by electron energies below 10 keV, the global UV and visible images mainly display the patterns of the low-energy

Bergen, Universitetet i

483

Solar Flares and particle acceleration  

E-Print Network [OSTI]

of Glasgow, UK STFC Summer School, Armagh, 2012 #12;Solar flares: basics X-raysradiowavesParticles1AU Figure energy ~2 1032 ergs #12;"Standard" model of a solar flare/CME Solar corona T ~ 106 K => 0.1 keV per MeV Proton energies >100 MeV Large solar flare releases about 1032 ergs (about half energy

484

Surface plasmon polariton modes in a single-crystal Au nanoresonator fabricated using focused-ion-beam milling  

E-Print Network [OSTI]

to 30 keV, and focused by an electrostatic lens system to a spot size with diameter as small as 5­10 nm, photovoltaics, tele- communications, and optoelectronic circuit integration due to their ability to concentrate.5,6 In a typical FIB system, Ga+ ions are extracted from a liquid-metal ion source, accel- erated

Polman, Albert

485

Low-energy cutoffs in electron spectra of solar flares: statistical survey  

E-Print Network [OSTI]

The Ramaty High Energy Solar Spectroscopic Imager (RHESSI) X-ray data base (February 2002 -- May 2006) has been searched to find solar flares with weak thermal components and flat photon spectra. Using a regularised inversion technique, we determine the mean electron flux distribution from count spectra of a selection of events with flat photon spectra in the 15--20 keV energy range. Such spectral behaviour is expected for photon spectra either affected by photospheric albedo or produced by electron spectra with an absence of electrons in a given energy range, e.g. a low-energy cutoff in the mean electron spectra of non-themal particles. We have found 18 cases which exhibit a statistically significant local minimum (a dip) in the range of 10--20 keV. The positions and spectral indices of events with low-energy cutoff indicate that such features are likely to be the result of photospheric albedo. It is shown that if the isotropic albedo correction was applied, all low-energy cutoffs in the mean electron spectrum were removed and hence the low energy cutoffs in the mean electron spectrum of solar flares above $\\sim$12 keV cannot be viewed as real features in the electron spectrum. If low-energy cutoffs exist in the mean electron spectra, the energy of low energy cutoffs should be less than $\\sim$12 keV.

E. P. Kontar; E. Dickson; J. Kasparova

2008-05-21T23:59:59.000Z

486

Trojan Horse particle invariance:the impact on nuclear astrophysics  

E-Print Network [OSTI]

than few hundred keV's). THM allows one to extract the low energy behavior of a binary reaction . The basic idea of the THM is to extract the cross section in the low-energy region of a two-body reaction reactions cross sections of astrophysical interest, in the energy range required by the astrophysical

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

487

*HRSK\\VLFDO /DERUDWRU\\*HRSK\\VLFDO /DERUDWRU\\ &DUQHJLH ,QVWLWXWLRQ&DUQHJLH ,QVWLWXWLRQ  

E-Print Network [OSTI]

level) #12;ENERGY AND INTERPARTICLE DISTANCES atomic electronic molecular nanoparticle nuclear electronic and magnetic phenomena · New chemical reactions: low to high pressure · New recoverable materials #12;Carnegie InstitutionCarnegie Institution 2 x 2.5 mm diamonds Radial Energy (keV) Axial 2 mm

Hemley, Russell J.

488

J. Condensed Matter Nucl. Sci. 5 (2011) 87101 Research Article  

E-Print Network [OSTI]

motivated us to pursue new models in which the nuclear energy is transferred directly to low energy In the Fleischmann­Pons experiment, energy is produced without commensurate energetic reaction products. To account energy estimated in this way is below 20 keV [12]. The experimental reaction energy per 4He observed

Williams, Brian C.

489

Holifield Radioactive Ion Beam Facility A leading international facility with unique capabilities for research in nuclear structure  

E-Print Network [OSTI]

questions that drive the field of low-energy nuclear physics: · How do protons and neutrons make stable Directions Nuclear structure and reaction research at HRIBF provides insight into the nature of the force species are available as low-energy (~50 keV) beams. More than 60 post-accelerated beams, including 132 Sn

490

Instructions for use PHYSICAL REVIEW C 86, 064604 (2012)  

E-Print Network [OSTI]

reactions in the low relative energy region are of a great interest from the astrophysics point of view, because the radiactive capture reactions at very low energies (Ecm 10­100 keV) are one of the key nuclear data are required for n- and p-induced reactions. Indeed, the International Atomic Energy Agency

Tsunogai, Urumu

491

Nuclear Chemistry Beta decay of 71,73  

E-Print Network [OSTI]

Scientist, UNISOR, 1993-95, Oak Ridge Associated Universities; 517-908-7456 THE LOW-ENERGY PROPERTIESof of a second, are produced in very small quantities using intermediate-energy reactions at the National method involves the co-propagation of a low-energy beam (~ 60 keV) of atoms/ions with laser light. Fixed

Mantica, Paul F.

492

Effects of the Hot Electron Interchange Instability on  

E-Print Network [OSTI]

Levitated Dipole Fusion Concept Levitated Dipole Reactor 30 m 60 m 500 MW D-D(He3) Fusion Kesner, et al 10 VisibleX-Ray E > 40 keV Anisotropic Fast Electrons Localized to ECRH Resonance High Beta Regime Beta Discharge ·Shot 50513029 · Optimal gas fueling ·Fixed from imaging · Rpeak = 0.75 m · p" / pll = 5

493

Nanoscale manipulation of Ge nanowires by ion irradiation Lucia Romano,1,a  

E-Print Network [OSTI]

of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, USA 3 Center and electromechanical devices. However, in many cases, manipulation and modification of nanowires are required to fully keV Ga+ implantation. Subsequently, viscous flow and plastic deformation occurred causing

Florida, University of

494

Noname manuscript No. (will be inserted by the editor)  

E-Print Network [OSTI]

.1007/s10751-006-9501-4 #12;2 formulas, nuclear binding energies of radionuclides far from the valley energies ( 100 keV), which had been previously deduced from laser and nuclear spectroscopy [13­15]. Mass.-J¨urgen Kluge Penning trap mass spectrometry for nuclear structure studies Received: date / Accepted: date

Boyer, Edmond

495

Electrostatic electron cyclotron waves generated by low-energy electron beams  

E-Print Network [OSTI]

Electrostatic electron cyclotron waves generated by low-energy electron beams J. D. Menietti, O the role of electron beams with E ] 1 keV in the generation of these waves. Observed plasma parameters these waves are an indicator of the presence of low-energy electron beams and a cold electron component (E ] 0

Santolik, Ondrej

496

Characterisation of a Composite LEPS  

E-Print Network [OSTI]

A low energy photon spectrometer (LEPS), which is a composite planar HPGe, has been characterised experimentally. It has been shown that beyond 200 keV, effect of image charges deteriorates the efficiency of the detector in its addback mode. Data has been corrected on eventby- event basis resulting in improvement of the performance.

Basu, Moumita Roy; Bisoi, Abhijit; Sarkar, M Saha

2015-01-01T23:59:59.000Z

497

Energy time dispersion of a new class of magnetospheric ion events observed near the Earth's bow shock  

E-Print Network [OSTI]

Energy time dispersion of a new class of magnetospheric ion events observed near the Earth's bow of several energetic (³35 keV) ion events observed near the Earth's bow shock by the CCE/AMPTE and IMP-7 responsible for the detection of this new type of near bow shock magnetospheric ion events. The new class

Boyer, Edmond

498

Abstract--The INTEGRAL satellite was launched on October 17, 2002. All on-board instruments are operating successfully. In  

E-Print Network [OSTI]

. The spectral response of the camera is affected by cosmic particles depositing huge amount of energy, greater. It is devoted to the observation of the universe between few keV up to 10 MeV, the energy range of the most (SPectrometer on Integral), performs spectral analysis of gamma-ray sources. Both are coded mask aperture

Boyer, Edmond

499

Limits on Very High Energy Emission from Gamma-Ray Bursts with the Milagro  

E-Print Network [OSTI]

Limits on Very High Energy Emission from Gamma-Ray Bursts with the Milagro Observatory Miguel F of Milagro allow it to detect very high energy (VHE) gamma-ray burst emission with much higher sensitivity gamma-ray burst satellites at keV to MeV energies. Even in the absence of a positive detection, VHE

California at Santa Cruz, University of

500

Paul Alexander Third Cavendish-KAIST Symposium September 2006 University of Cambridge  

E-Print Network [OSTI]

supersonic (relativistic?) jets radio source · Supersonic expansion heating by bow shock jvj 2 ~ xvx 2 gas swept up between bow shock and contact surface · Work done on external gas is pdV work Stored energy by expanding radio source becomes unstable to a combined hydro dynamical / thermal instability 3.8 keV 6.6 ke

Steiner, Ullrich