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Note: This page contains sample records for the topic "types electron muon" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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1

Electrons from Muon Capture  

Science Journals Connector (OSTI)

We have searched for the process ?-+p?p+e- or ?-+n?n+e- for ? mesons stopped in a Cu target. Scintillation counters were employed to detect the electrons from the process. No counts attributable to the electrons were obtained and we place an upper limit of ?5×10-4 for the relative rate of this process to that for the usual nuclear capture reaction.

J. Steinberger and Harry B. Wolfe

1955-12-01T23:59:59.000Z

2

Muon to electron conversion: how to find an electron in a muon haystack  

Science Journals Connector (OSTI)

...year' compiled and edited by Michael Pepper Muon to electron conversion: how to find an electron in a muon haystack A. Kurup 1 2 * * a.kurup@imperial...processes that are forbidden by the SM, such as muon to electron conversion. This paper will...

2010-01-01T23:59:59.000Z

3

Search for muon-electron and muon-positron conversion  

Science Journals Connector (OSTI)

Limits on the lepton-flavor-violating reactions ?-+Z?e-+Z and ?-+Z?e++(Z-2), muon-electron and muon-positron conversion, have been obtained from a search performed at TRIUMF using a time-projection chamber. Upper limits (90% C.L.) for the branching ratios compared to ordinary muon capture for a titanium target are R—(Ti)=?(?-Ti?e-Ti)/?(?-Ti capture)<4.6×10-12 and R+(Ti)=?(?-Ti?e+Ca*)/?(?-Ti capture)<.1.7×10-10 A smaller data set obtained using a lead target yielded R-(Pb)<4.9×10-10. The implications of these results for extensions of the standard model which allow lepton-flavor violation are discussed.

S. Ahmad; G. Azuelos; M. Blecher; D. A. Bryman; R. A. Burnham; E. T. H. Clifford; P. Depommier; M. S. Dixit; K. Gotow; C. K. Hargrove; M. Hasinoff; M. Leitch; J. A. Macdonald; H. Mes; I. Navon; T. Numao; J-M. Poutissou; R. Poutissou; P. Schlatter; J. Spuller; J. Summhammer

1988-10-01T23:59:59.000Z

4

ELECTRON MODEL OF AN FFAG MUON ACCELERATOR.  

SciTech Connect

Parameters are derived for the lattice and RF system of an electron model of a non-scaling FFAG ring for accelerating muons. The model accelerates electrons from about 10 to about 20 MeV, and has about 15 m circumference. Magnet types and dimensions, spacing, half apertures, about 12 mm by 20 mm, and number of cells are presented. The tune variation with momentum covers several integers, similar to that in a full machine, and allows the study of resonance crossing. The consequences of misaligned magnets are studied by simulation. The variation of orbit length with momentum is less than 36 mm, and allows the study of acceleration outside a bucket. A 100 mm straight section, in each of the cells, is adequately long for an RF cavity operating at 3 GHz. Hamiltonian dynamics in longitudinal phase space close to transition is used to calculate the accelerating voltage needed. Acceleration is studied by simulation. Practical RF system design issues, e.g. RF power, and beam loading are estimated.

KEIL,E.; BERG,J.S.; SESSLER,A.M.

2004-09-14T23:59:59.000Z

5

Muon Pair Creation by a High Energy Electron  

Science Journals Connector (OSTI)

......research-article Articles Muon Pair Creation by a High Energy Electron Takao Yamamoto...cross section for the muon pair creation by an electron...calculated at the incident energy about 1 Bev. At the angles of emitted muons theta+ = theta- 45......

Takao Yamamoto

1962-02-01T23:59:59.000Z

6

Muon Endcap Trigger Electronics Document presented for FDR  

E-Print Network (OSTI)

Muon Endcap Trigger Electronics Document presented for FDR held on March,1,2004 CF Slice Tests of Level 1 Muon End-cap Trigger System ATLAS TGC electronics group 4th February 2004 I. Introduction We for the muon beam test held in 2003 at SPS H8 beam line. We have roughly four major development phases during

Fukunaga, Chikara

7

Scattering of High-Energy Positive and Negative Muons on Electrons  

Science Journals Connector (OSTI)

The elastic interaction of 10.1-GeV/c positive and 14.5-GeV/c negative muons with electrons in nuclear emulsion has been studied. Energies of the knock-on electrons calculated from scattering measurements were comparable with those obtained from their ejection angles. In the case of both positive and negative muon-electron elastic scattering we did not observe any departure of the muon from a Dirac-type particle with transferred energies up to 1.4 and 3 GeV, respectively. This is in contradiction with some of the previous results.

P. L. Jain and N. J. Wixon

1969-09-29T23:59:59.000Z

8

Energy spectrum of muons from their knock-on electrons  

Science Journals Connector (OSTI)

The energy spectrum of muons producing knock-on electrons in medium- and...Z elements has been determined. The energy of a muon can be determined from the energy it transfers to a knock-on electron ... with the d...

A. K. Das

1969-01-11T23:59:59.000Z

9

ATLAS Muon TGC Trigger Electronics TTC signal distribution Extended URD  

E-Print Network (OSTI)

ATLAS Muon TGC Trigger Electronics TTC signal distribution Extended URD Version 0 June 2000 1 a TTCrx chip which receives signals distributed by the ATLAS central TTC system. The SPP then extracts to the LVDS level, and #12;ATLAS Muon TGC Trigger Electronics TTC signal distribution Extended URD Version 0

Fukunaga, Chikara

10

Muon Endcap Trigger Electronics Document presented for FDR  

E-Print Network (OSTI)

Muon Endcap Trigger Electronics Document presented for FDR held on March 1, 2004 CF High-pT (Hi information from both inputs are made coincidence in the matrix block to identify high pT muons (pT > 20 GeV/c). Maximum two highest pT muons can be selected in 2-out-of- 6 select block, and the position data

Fukunaga, Chikara

11

High-Energy Muon-Proton Scattering: Muon-Electron Universality  

Science Journals Connector (OSTI)

Measurements of the ?-p elastic cross section in the range 0.15muon and electron experiments which can possibly be accounted for by a combination of systematic normalization errors.

L. Camilleri; J. H. Christenson; M. Kramer; L. M. Lederman; Y. Nagashima; T. Yamanouchi

1969-07-21T23:59:59.000Z

12

Muon decay in orbit: Spectrum of high-energy electrons  

Science Journals Connector (OSTI)

Experimental searches for lepton-flavor-violating coherent muon-to-electron conversion in the field of a nucleus, have been proposed to reach the unprecedented sensitivity of 10-16–10-18 per stopped muon. At that level, they probe new interactions at effective-mass scales well beyond 1000 TeV. However, they must contend with background from ordinary bound muon decay. To better understa560nd the background-spectrum shape and rate, we have carried out a detailed analysis of Coulombic-bound-state muon decay, including nuclear recoil. Implications for future experiments are briefly discussed.

Andrzej Czarnecki, Xavier Garcia i Tormo, and William J. Marciano

2011-07-14T23:59:59.000Z

13

ATLAS Muon TGC Trigger Electronics Slave Board ASIC Extended URD  

E-Print Network (OSTI)

ATLAS Muon TGC Trigger Electronics Slave Board ASIC Extended URD Version 0 June 2000 1 Slave Board position of a MATRIX while one from the pivot plane specifies one of the raw. Thus the #12;ATLAS Muon TGC at the highest r is selected from each section giving three hits per an SB chip for the wire triplet. #12;ATLAS

Fukunaga, Chikara

14

Searches for muon-electron and muon-positron conversion in titanium  

Science Journals Connector (OSTI)

Searches have been performed for neutrinoless muon-electron conversion and muon-positron conversion using a time projection chamber. An upper limit on the branching ratio for the coherent reaction R(?- +Ti?e-+Ti)muon capture was obtained. For the process ?-+Ti?e++Ca no events were observed for positron momenta p>96 MeV/c leading to an upper limit on the partial branching ratio relative to ordinary muon capture ?p>96(?-+Ti?e+ +Ca)/?(?-+Ti?capture) <9×10-12 (90% C.L.). With the assumption of a giant-resonance-excitation model the integrated limit would be ?(?-+Ti?e++Ca)/?(?- +Ti?capture)<1.7×10-10 (90% C.L.).

S. Ahmad; G. Azuelos; M. Blecher; D. Bryman; R. A. Burnham; E. T. H. Clifford; P. Depommier; M. S. Dixit; K. Gotow; C. K. Hargrove; M. Hasinoff; J. A. Macdonald; H. Mes; T. Numao; J.-M. Poutissou; R. Poutissou; J. Spuller; J. Summhammer

1987-08-31T23:59:59.000Z

15

Electron-Muon Correlations in Proton+Proton and Deuteron+Gold Collisions at PHENIX.  

E-Print Network (OSTI)

??This dissertation presents the first measurement of electron-muon azimuthal correlations at the PHENIX experiment at RHIC in 200 GeV proton-proton and deuteron-gold collisions. Electron-muon pairs… (more)

Engelmore, Tatia

2011-01-01T23:59:59.000Z

16

Scattering of High-Energy Muons on Electrons  

Science Journals Connector (OSTI)

The elastic muon-electron interactions of 10.1-GeV/c positive and 5.0- and 14.5-GeV/c negative muons produced at the Brookhaven alternating gradient synchrotron have been studied in nuclear emulsions. Energies of knockon electrons calculated from scattering measurements were compared with those obtained from their ejection angles. Integral cross sections were compared with the Bhabha prediction for the scattering of two point fermions. Excellent agreement was found for negative and positive primary muons up to t=3.3×10-3 (GeV/c)2 and t=1.8×10-3 (GeV/c)2, respectively. Our results are in contradiction to some of the previous cosmic-ray data, which show an anomalously large cross section.

P. L. Jain, N. J. Wixon, D. A. Phillips, and J. T. Fecteau

1970-02-01T23:59:59.000Z

17

ATLAS Muon TGCTrigger Electronics Hi-pT ASIC Extended URD  

E-Print Network (OSTI)

ATLAS Muon TGCTrigger Electronics Hi-pT ASIC Extended URD Version 0 June,2000 1 Hi-pT ASIC Design-Packard G-link protocol. #12;ATLAS Muon TGCTrigger Electronics Hi-pT ASIC Extended URD Version 0 June,2000 2 Position for r position Strip one channel: 1bit Hit on/off + 4 bit position for position #12;ATLAS Muon

Fukunaga, Chikara

18

ATLAS Muon TGC Trigger Electronics High-pT ASIC Specification  

E-Print Network (OSTI)

ATLAS Muon TGC Trigger Electronics High-pT ASIC Specification Version 1.02 August, 2002 1 High-pT Trigger ASIC for ATLAS TGC1 Contents High-pT ASIC Technical Document 1. Introduction 2. Overview.comp.metro-u.ac.jp/~fukunaga/public_html/atlas/HipTASIC.pdf #12;ATLAS Muon TGC Trigger Electronics High

Fukunaga, Chikara

19

JEMMRLA - Electron Model of a Muon RLA with Multi-pass Arcs  

SciTech Connect

We propose a demonstration experiment for a new concept of a 'dogbone' RLA with multi-pass return arcs -- JEMMRLA (Jlab Electron Model of Muon RLA). Such an RLA with linear-field multi-pass arcs was introduced for rapid acceleration of muons for the next generation of Muon Facilities. It allows for efficient use of expensive RF while the multi-pass arc design based on linear combined-function magnets exhibits a number of advantages over separate-arc or pulsed-arc designs. Here we describe a test of this concept by scaling a GeV scale muon design for electrons. Scaling muon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.5 MeV electron beam is injected in the middle of a 3 MeV/pass linac with two double-pass return arcs and is accelerated to 18 MeV in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, which arises from scaling the 200 MHz muon RF to a readily available 1.5 GHz. The hardware requirements are not very demanding making it straightforward to implement. Such an RLA may have applications going beyond muon acceleration: in medical isotope production, radiation cancer therapy and homeland security.

Bogacz, Slawomir Alex; Krafft, Geoffrey A.; Morozov, Vasiliy S.; Roblin, Yves R.

2013-06-01T23:59:59.000Z

20

Scattering of High-Energy Positive and Negative Muons on Electrons  

Science Journals Connector (OSTI)

A counter experiment on ?±e scattering has been performed in the muon beam at the Brookhaven AGS with particular emphasis on a possible asymmetry. Two strongly filtered beams of either sign were available, one peaked at 10.5 GeV/c, and the other at 5.5 GeV/c produced by further energy degradation in a uranium absorber. Electron energies were measured in terms of the light output produced by the cascade shower generated in a total absorption multilayer Pb scintillator counter. Two types of runs were made using the same apparatus with different event selection. In the first type all incident muons triggering the beam-defining hodoscope were counted, the effective target was distributed through the entire apparatus, and all pulses from the shower counter were measured and stored in a 400-channel pulse-height analyzer. In the second type the target volume was rather well defined, by a suitable pulse signature, to be the middle one of three water-?erenkov counters placed in tandem in front of the shower detector. Results of the first type show that there is no asymmetry >±10% in the total electromagnetic energy loss spectrum from 0.1 to 6 GeV. Results of the second type, which have less good statistics, give the absolute ?-e scattering cross section to ±30% with no indication of an asymmetry.

Thomas B. W. Kirk and Seth H. Neddermeyer

1968-07-25T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

The Muon and Muon Pair Production in Electron-Positron Annihilation  

Science Journals Connector (OSTI)

The muon was discovered in cosmic rays in 1937... 11.1 $$ m_e = 0.5110034(14)MeV, m_\\mu = 105.65932(29)MeV. $$ ...

Otto Nachtmann

1990-01-01T23:59:59.000Z

22

SCALED ELECTRON MODEL OF A DOGBONE MUON RLA WITH MULTI-PASS ARCS  

SciTech Connect

The design of a dogbone RLA with linear-field multi-pass arcs was earlier developed for accelerating muons in a Neutrino Factory and a Muon Collider. It allows for efficient use of expensive RF while the multi-pass arc design based on linear combined-function magnets exhibits a number of advantages over separate-arc or pulsed-arc designs. Such an RLA may have applications going beyond muon acceleration. This paper describes a possible straightforward test of this concept by scaling a GeV scale muon design for electrons. Scaling muon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.5 MeV electron beam is injected at the middle of a 3 MeV/pass linac with two double-pass return arcs and is accelerated to 18 MeV in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, which arises from scaling the 200 MHz muon RF to a readily available at CEBAF 1.5 GHz. The footprint of a complete RLA fits in an area of 25 by 7 m. The scheme utilizes only fixed magnetic fields including injection and extraction. The hardware requirements are not very demanding, making it straightforward to implement. In this report, we have shown first of all that measuring the energy spectrum of the fast neutrons in the liquid scintillators allows one to distinguish the two chemical forms of plutonium. In addition, combining this information with the Feynman 2-neutron and 3-neutron correlations allows one to extract the {alpha}-ratio without explicitly knowing the multiplication. Given the {alpha}-ratio one can then extract the multiplication as well as the {sup 239}Pu and {sup 240}Pu masses directly from the moment equations.

Kevin Beard, Rolland Johnson, Vasiliy Morozov, Yves Roblin, Andrew Hutton, Geoffrey Krafft, Slawomir Bogacz

2012-07-01T23:59:59.000Z

23

Tau contributions to muon/electron events at a neutrino factory  

SciTech Connect

The oscillation of the muon and electron neutrinos (anti-neutrinos) to tau neutrinos (anti-neutrinos) adds to the muon and electron events sample (both right sign and wrong sign) via leptonic decays of the taus produced through charge current interactions in the detector. We focus on how this contribution affects a precision measurement of the atmospheric mixing parameters and the deviation of v{sub {mu}} {r_reversible} v{sub {tau}} mixing from maximality. We also comment on the tau contamination in the golden and platinum channels.

Sinha, Nita [Institute of Mathematical Sciences, Chennai 600 113 (India)

2011-10-06T23:59:59.000Z

24

The direct production of electron pairs by high-energy muons underground (148 m w.e.)  

Science Journals Connector (OSTI)

Direct production of electron pairs in thin iron targets by muons of mean energy 32.6 GeV was studied with a ... two or more electrons associated with each outgoing muon from the targets were selected and their energy

N. Chaudhuri; M. S. Sinha

1964-01-16T23:59:59.000Z

25

The Muon Collider  

E-Print Network (OSTI)

11] D. Summers et al. , “Muon Acceleration to 750 GeV in theThe muon collider M. S. Zisman * Lawrence Berkeley Nationalnew type of accelerator, the muon collider. This accelerator

Zisman, Michael S.

2011-01-01T23:59:59.000Z

26

The Muon Collider  

E-Print Network (OSTI)

11] D. Summers et al. , “Muon Acceleration to 750 GeV in theThe muon collider M. S. Zisman * Lawrence Berkeley Nationalnew type of accelerator, the muon collider. This accelerator

Zisman, Michael S

2010-01-01T23:59:59.000Z

27

A calculation of the number of muons at sea-level in a photon-electron cascade initiated by a primary photon of energy 1014eV  

Science Journals Connector (OSTI)

The muon component in a photon-electron cascade initiated...14...eV has been estimated for sea-level in the longitudinal development of the electromagnetic cascade. Two distinct possible processes of muon product...

N. Mishra

1966-01-11T23:59:59.000Z

28

Energy spectrum of pions and polarization of muons and electrons in the K?3 and Ke3 decay  

Science Journals Connector (OSTI)

In this paper two aspects of the K?3 and Ke3 decay are discussed: the energy density of final states and the longitudinal polarization of the muons and electrons. It is assumed that the ... theory of the neutrino...

S. W. McDowell

1957-01-01T23:59:59.000Z

29

Muon Tridents  

Science Journals Connector (OSTI)

Under the assumption that muons are heavy electrons, the total cross section for muon tridents on lead is calculated for 12.0-BeV incident muons including the effect of exchange for identical particles in the final state; various differential cross sections are presented. The positron spectrum for 31.5-MeV electron tridents on copper is also calculated and found to agree with Criegee's experimental results. It is found that the entire effect of statistics is confined to a region of phase space where the two leptons of like charge in the final state have an invariant mass of less than 3.5 times their rest mass.

Michael J. Tannenbaum

1968-03-25T23:59:59.000Z

30

The Muon to Electron Conversion Experiment at Fermilab  

E-Print Network (OSTI)

2e The Future: Project X and Mu2e Outline #12;nucleus n ·p n ·p Electron Quark higher beam particle of matter The Frontiers The Intensity Frontier and Precision Measurements Charged Lepton Flavor Violation Mu energy = smaller size you can see 0.000000000000000001 m nano nano meter Everything that we can see

Dai, Pengcheng

31

An Emulator of Timing, Trigger and Control (TTC) System for the ATLAS End cap Muon Trigger Electronics  

E-Print Network (OSTI)

An Emulator of Timing, Trigger and Control (TTC) System for the ATLAS End cap Muon Trigger and their sequences needed for the ATLAS TGC electronics. Almost all functionalities are packed in an FPGA chip, which of the mother board electronics system. I. INTRODUCTION In general a facility for TTC signal generation

Fukunaga, Chikara

32

A Discrimination Procedure between Muon and Electron in Superkamiokande Experiment Based on the Angular Distribution Function Method  

E-Print Network (OSTI)

In the previous paper, we construct the angular distribution functions for muon and electron as well as their relative fluctuation functions to find suitable discrimination procedure between muon and electron in Superkamiokande experiment. In the present paper, we are able to discriminate muons from electrons in Fully Contained Events with a probability of error of less than several %. At the same time, our geometrical reconstruction procedure, considering only the ring-like structure of the Cherenkov image, gives an unsatisfactory resolution for 1GeV electron and muon, with a mean vertex position error, delta r, of 5-10 m and a mean directional error, delta theta, of about 6-20 degrees. In contrast, a geometrical reconstruction procedure utilizing the full image and using a detailed approximation of the event angular distribution works much better: for a 1 GeV electron, delta r is about 2 m and delta theta is about 3 degrees; for a 1GeV muon, delta r is about 3 m and delta theta is about 5 degrees. At 5 GeV, the corresponding values are about 1.4 m and about 2 degree for electron and are about 2.9m and about 4.3 degrees for muon. The numerical values depend on a single PMT contribution threshold. The values quoted above are the minima with respect to this threshold. Even the methodologically correct approach we have adopted, based on detailed simulations using closer approximations than those adopted in the SK analysis, cannot reproduce the accuracies for particle discrimination, momentum resolution, interaction vertex location, and angular resolution obtained by the SK simulations, suggesting the assumptions in these may be inadequate.

V. I. Galkin[1; A. M. Anokhina[1; E. Konishi[2; A. Misaki{3

2005-01-21T23:59:59.000Z

33

Total Hadron Cross Section, New Particles, and Muon Electron Events in e{sup +}e{sup -} Annihilation at SPEAR  

DOE R&D Accomplishments (OSTI)

The review of total hadron electroproduction cross sections, the new states, and the muon--electron events includes large amount of information on hadron structure, nine states with width ranging from 10's of keV to many MeV, the principal decay modes and quantum numbers of some of the states, and limits on charm particle production. 13 references. (JFP)

Richter, B.

1976-01-00T23:59:59.000Z

34

Inclusive top pair production at Tevatron and LHC in electron/muon final states  

E-Print Network (OSTI)

Recent measurements of the inclusive top pair production at the Tevatron and LHC collider in the electron/muon final states are discussed. Measurements at the Tevatron use up to 9.7 /fb of data, and at the LHC up to 4.9 /fb of data at $\\sqrt{s}=7$ TeV and up to 20.3 /fb of data at $\\sqrt{s}=8$ TeV. For the experiments at both colliders these corresponds to the full data sets at the given center-of-mass energies. Overall results are in agreement between the experiments at the Tevatron and between the experiments at the LHC. All measurements are in agreement with recent theory calculations at NNLO QCD. Individual LHC measurements are challenging the precision of the theory calculations.

Andreas Werner Jung

2013-12-23T23:59:59.000Z

35

Muon Reconstruction and Identification in CMS  

SciTech Connect

We present the design strategies and status of the CMS muon reconstruction and identification identification software. Muon reconstruction and identification is accomplished through a variety of complementary algorithms. The CMS muon reconstruction software is based on a Kalman filter technique and reconstructs muons in the standalone muon system, using information from all three types of muon detectors, and links the resulting muon tracks with tracks reconstructed in the silicon tracker. In addition, a muon identification algorithm has been developed which tries to identify muons with high efficiency while maintaining a low probability of misidentification. The muon identification algorithm is complementary by design to the muon reconstruction algorithm that starts track reconstruction in the muon detectors. The identification algorithm accepts reconstructed tracks from the inner tracker and attempts to quantify the muon compatibility for each track using associated calorimeter and muon detector hit information. The performance status is based on detailed detector simulations as well as initial studies using cosmic muon data.

Everett, A. [Purdue University, West Lafayette, IN, 47906 (United States)

2010-02-10T23:59:59.000Z

36

Negative Muon Chemistry: The Quantum Muon Effect and the Finite Nuclear Mass Effect  

Science Journals Connector (OSTI)

Negative Muon Chemistry: The Quantum Muon Effect and the Finite Nuclear Mass Effect ... In this approach electrons and muons are described as quantum waves. ... The nonrelativistic Hamiltonian, Htot, of a molecular system containing Ne electrons, N? muons, and Nnuc nuclei is(1)here m? is the muon mass and MA and ZA are the mass and charge of nucleus A, respectively. ...

Edwin Posada; Félix Moncada; Andrés Reyes

2014-09-04T23:59:59.000Z

37

Critical Issues and MUON Colliders - A Summary  

E-Print Network (OSTI)

Prospects for a High Energy Muon Collider Based On Electro-and understanding of high energy muon colliders, associatedyield of muons per electron, even at the optimum energy of

Chattopadhyay, S.

2008-01-01T23:59:59.000Z

38

Too Many Muons from Cosmic Accelerators?  

Science Journals Connector (OSTI)

The evidence for both surface and underground muons produced by radiation from Cyg X3 is reviewed. The number of surface muons if real require impossibly large muon to electron ratios if they are produced by gamm...

R. Morse

1987-01-01T23:59:59.000Z

39

Multi Leptons in ep Collisions at HERA Analyses of multi-muon & and multi-electron production  

E-Print Network (OSTI)

Multi Leptons in ep Collisions at HERA Analyses of multi-muon & and multi-electron production Boris Lei�ner, RWTH Aachen on behalf of the and collaborations B. Lei�ner, Multi Leptons in ep Collisions - 1 for additional leptons e e e p · Conclusions B. Lei�ner, Multi Leptons in ep Collisions - 2 #12;Outline · How

40

Muon spin rotation in heavy-electron pauli-limit superconductors  

SciTech Connect

The formalism for analyzing the magnetic field distribution in the vortex lattice of Pauli-limit heavy-electron superconductors is applied to the evaluation of the vortex lattice static linewidth relevant to the muon spin rotation ({mu}SR) experiment. Based on the Ginzburg-Landau expansion for the superconductor free energy, we study the evolution with respect to the external field of the static linewidth both in the limit of independent vortices (low magnetic field) with a variational expression for the order parameter and in the near H{sub c2}{sup P}(T) regime with an extension of the Abrikosov analysis to Pauli-limit superconductors. We conclude that in the Ginzburg-Landau regime in the Pauli-limit, anomalous variations of the static linewidth with the applied field are predicted as a result of the superconductor spin response around a vortex core that dominates the usual charge-response screening supercurrents. We propose the effect as a benchmark for studying new puzzling vortex lattice properties recently observed in CeCoIn{sub 5}.

Michal, V. P., E-mail: vincent.michal@cea.fr [INAC/SPSMS, Commissariat a l'Energie Atomique (France)

2012-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Muon Muon Collider: Feasibility Study  

SciTech Connect

A feasibility study is presented of a 2 + 2 TeV muon collider with a luminosity of L = 10{sup 35} cm{sup -2}s{sup -1}. The resulting design is not optimized for performance, and certainly not for cost; however, it does suffice - we believe - to allow us to make a credible case, that a muon collider is a serious possibility for particle physics and, therefore, worthy of R and D support so that the reality of, and interest in, a muon collider can be better assayed. The goal of this support would be to completely assess the physics potential and to evaluate the cost and development of the necessary technology. The muon collider complex consists of components which first produce copious pions, then capture the pions and the resulting muons from their decay; this is followed by an ionization cooling channel to reduce the longitudinal and transverse emittance of the muon beam. The next stage is to accelerate the muons and, finally, inject them into a collider ring wich has a small beta function at the colliding point. This is the first attempt at a point design and it will require further study and optimization. Experimental work will be needed to verify the validity of diverse crucial elements in the design. Muons because of their large mass compared to an electron, do not produce significant synchrotron radiation. As a result there is negligible beamstrahlung and high energy collisions are not limited by this phenomena. In addition, muons can be accelerated in circular devices which will be considerably smaller than two full-energy linacs as required in an e{sup +} - e{sup -} collider. A hadron collider would require a CM energy 5 to 10 times higher than 4 TeV to have an equivalent energy reach. Since the accelerator size is limited by the strength of bending magnets, the hadron collider for the same physics reach would have to be much larger than the muon collider. In addition, muon collisions should be cleaner than hadron collisions. There are many detailed particle reactions which are open to a muon collider and the physics of such reactions - what one learns and the necessary luminosity to see interesting events - are described in detail. Most of the physics accesible to an e{sup +} - e{sup -} collider could be studied in a muon collider. In addition the production of Higgs bosons in the s-channel will allow the measurement of Higgs masses and total widths to high precision; likewise, t{bar t} and W{sup +}W{sup -} threshold studies would yield m{sub t} and m{sub w} to great accuracy. These reactions are at low center of mass energy (if the MSSM is correct) and the luminosity and {Delta}p/p of the beams required for these measurements is detailed in the Physics Chapter. On the other hand, at 2 + 2 TeV, a luminosity of L {approx} 10{sup 35} cm{sup -2}s{sup -1} is desirable for studies such as, the scattering of longitudinal W bosons or the production of heavy scalar particles. Not explored in this work, but worth noting, are the opportunities for muon-proton and muon-heavy ion collisions as well as the enormous richness of such a facility for fixed target physics provided by the intense beams of neutrinos, muons, pions, kaons, antiprotons and spallation neutrons. To see all the interesting physics described herein requires a careful study of the operation of a detector in the very large background. Three sources of background have been identified. The first is from any halo accompanying the muon beams in the collider ring. Very carefully prepared beams will have to be injected and maintained. The second is due to the fact that on average 35% of the muon energy appears in its decay electron. The energy of the electron subsequently is converted into EM showers either from the synchrotron radiation they emit in the collider magnetic field or from direct collision with the surrounding material. The decays that occur as the beams traverse the low beta insert are of particular concern for detector backgrounds. A third source of background is e{sup +} - e{sup -} pair creation from {mu}{sup +} - {mu}{sup -} interaction. Studies of

Gallardo, J.C.; Palmer, R.B.; /Brookhaven; Tollestrup, A.V.; /Fermilab; Sessler, A.M.; /LBL, Berkeley; Skrinsky, A.N.; /Novosibirsk, IYF; Ankenbrandt, C.; Geer, S.; Griffin, J.; Johnstone, C.; Lebrun, P.; McInturff, A.; Mills, Frederick E.; Mokhov, N.; Moretti, A.; Neuffer, D.; Ng, K.Y.; Noble, R.; Novitski, I.; Popovic, M.; Qian, C.; Van Ginneken, A. /Fermilab /Brookhaven /Wisconsin U., Madison /Tel Aviv U. /Indiana U. /UCLA /LBL, Berkeley /SLAC /Argonne /Sobolev IM, Novosibirsk /UC, Davis /Munich, Tech. U. /Virginia U. /KEK, Tsukuba /DESY /Novosibirsk, IYF /Jefferson Lab /Mississippi U. /SUNY, Stony Brook /MIT /Columbia U. /Fairfield U. /UC, Berkeley; ,

2012-04-05T23:59:59.000Z

42

Muon collider gains momentum  

Science Journals Connector (OSTI)

... , US scientists staked their claim in a daring new venture: the world's first muon collider. The collider could overtake two more-mature concepts, each of which plan to ... expected to achieve. They are now trying to rally enthusiasm for a collider that smashes muons, a particle that is about 200 times more massive than the electron. ...

Eric Hand

2009-11-18T23:59:59.000Z

43

The Muon Accelerator Program  

SciTech Connect

Multi-TeV Muon Colliders and high intensity Neutrino Factories have captured the imagination of the particle physics community. These new types of facility both require an advanced muon source capable of producing O(10{sup 21}) muons per year. The muons must be captured within bunches, and their phase space manipulated so that they fit within the acceptance of an accelerator. In a Neutrino Factory (NF), muons from this 'front end' are accelerated to a few GeV or a few tens of GeV, and then injected into a storage ring with long straight sections. Muon decays in the straight sections produce an intense neutrino beam. In a Muon Collider (MC) the muons must be cooled by a factor O(10{sup 6}) to produce beams that are sufficiently bright to give high luminosity in the collider. Bunches of positive and negative muons are then accelerated to high energy, and injected in opposite directions into a collider ring in which they collide at one or more interaction points. Over the last decade our understanding of the concepts and technologies needed for Muon Colliders and Neutrino Factories has advanced, and it is now believed that, within a few years, with a well focused R&D effort (i) a Neutrino Factory could be proposed, and (ii) enough could be known about the technologies needed for a Muon Collider to assess the feasibility and cost of this new type of facility, and to make a detailed plan for the remaining R&D. Although these next NF and MC steps are achievable, they are also ambitious, and will require an efficient and dedicated organization to accomplish the desired goals with limited resources. The Muon Accelerator Program (MAP) has recently been created to propose and execute this R&D program.

Geer, Steve; /Fermilab; Zisman, Mike; /LBL, Berkeley

2011-08-01T23:59:59.000Z

44

R&D Toward a Neutrino Factory and Muon Collider  

E-Print Network (OSTI)

electrons of the same energy, muons experience negligibleBeam-beam tune shift Muons per bunch Beam stored energy (kJ)results in a muon beam having a large energy spread and very

Zisman, Michael S

2011-01-01T23:59:59.000Z

45

Muon-proton Scattering  

E-Print Network (OSTI)

A recent proposal to measure the proton form factor by means of muon-proton scattering will use muons which are not ultrarelativistic (and also not nonrelativistic). The usual equations describing the scattering cross section use the approximation that the scattered lepton (usually an electron) is ultrarelativistic, with v/c approximately equal to 1. Here the cross section is calculated for all values of the energy. It agrees with the standard result in the appropriate limit.

E. Borie

2012-07-24T23:59:59.000Z

46

Measurements of the electron and muon inclusive cross-sections in proton-proton collisions at root s=7 TeV with the ATLAS detector  

SciTech Connect

This Letter presents measurements of the differential cross-sections for inclusive electron and muon production in proton-proton collisions at a centre-of-mass energy of {radical}s = 7 TeV, using data collected by the ATLAS detector at the LHC. The muon cross-section is measured as a function of pT in the range 4 < pT < 100 GeV and within pseudorapidity |{eta}| < 2.5. In addition the electron and muon cross-sections are measured in the range 7 < pT < 26 GeV and within |{eta}| < 2.0, excluding 1.37 < |{eta}| < 1.52. Integrated luminosities of 1.3 pb{sup -1} and 1.4 pb{sup -1} are used for the electron and muon measurements, respectively. After subtraction of the W/Z/{gamma}{sm_bullet} contribution, the differential cross-sections are found to be in good agreement with theoretical predictions for heavy-flavour production obtained from Fixed Order NLO calculations with NLL high-pT resummation, and to be sensitive to the effects of NLL resummation.

Aad, G.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adams, D. L.; Addy, T. N.; Adelman, J.; Aderholz, M.; Adomeit, S.; Adragna, P.; Adye, T.; et al.

2012-02-07T23:59:59.000Z

47

Muon colliders and neutrino factories  

SciTech Connect

Over the last decade there has been significant progress in developing the concepts and technologies needed to produce, capture and accelerate {Omicron}(10{sup 21}) muons/year. This development prepares the way for a new type of neutrino source (Neutrino Factory) and a new type of very high energy lepton-antilepton collider (Muon Collider). This article reviews the motivation, design and R&D for Neutrino Factories and Muon Colliders.

Geer, S.; /Fermilab

2010-09-01T23:59:59.000Z

48

The Muon Collider  

SciTech Connect

We describe the scientific motivation for a new type of accelerator, the muon collider. This accelerator would permit an energy-frontier scientific program and yet would fit on the site of an existing laboratory. Such a device is quite challenging, and requires a substantial R&D program. After describing the ingredients of the facility, the ongoing R&D activities of the Muon Accelerator Program are discussed. A possible U.S. scenario that could lead to a muon collider at Fermilab is briefly mentioned.

Zisman, Michael S

2010-05-17T23:59:59.000Z

49

The Muon g-2 Experiment The NMR Probe Circuitry  

E-Print Network (OSTI)

The Muon g-2 Experiment The NMR Probe Circuitry Upgrading the Circuit Building the Circuit Future Work Updating NMR Probe Electronics in the Muon g-2 Experiment Audrey Kvam University of Washington September 1, 2014 Audrey Kvam Updating NMR Probe Electronics in the Muon g-2 Experiment #12;The Muon g-2

Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group

50

Muon Collider Progress: Accelerators  

SciTech Connect

A muon collider would be a powerful tool for exploring the energy-frontier with leptons, and would complement the studies now under way at the LHC. Such a device would offer several important benefits. Muons, like electrons, are point particles so the full center-of-mass energy is available for particle production. Moreover, on account of their higher mass, muons give rise to very little synchrotron radiation and produce very little beamstrahlung. The first feature permits the use of a circular collider that can make efficient use of the expensive rf system and whose footprint is compatible with an existing laboratory site. The second feature leads to a relatively narrow energy spread at the collision point. Designing an accelerator complex for a muon collider is a challenging task. Firstly, the muons are produced as a tertiary beam, so a high-power proton beam and a target that can withstand it are needed to provide the required luminosity of ~1 × 10{sup 34} cm{sup –2}s{sup –1}. Secondly, the beam is initially produced with a large 6D phase space, which necessitates a scheme for reducing the muon beam emittance (“cooling”). Finally, the muon has a short lifetime so all beam manipulations must be done very rapidly. The Muon Accelerator Program, led by Fermilab and including a number of U.S. national laboratories and universities, has undertaken design and R&D activities aimed toward the eventual construction of a muon collider. Design features of such a facility and the supporting R&D program are described.

Zisman, Michael S.

2011-09-10T23:59:59.000Z

51

An Overview on Muon Physics  

SciTech Connect

A summary of the present status of the charged lepton flavor violation search with muons is presented. The relevant measurements (g-2){sub {mu}}, the {mu} {sup +}{yields} e{sup +} {gamma} decay and the direct muon-to-electron conversion projects are briefly reviewed.

Piredda, Giancarlo [INFN Sezione di Roma, Dipartimento di Fisica, Universita Sapienza (Italy)

2011-10-06T23:59:59.000Z

52

Muon Spin Rotation Studies of Enediynes  

Science Journals Connector (OSTI)

The muon spin plays the role of a nuclear spin, but the spectroscopy proves to be equally sensitive both to muons in electronically diamagnetic environments and to those which experience a hyperfine coupling with paramagnetic electrons, the latter being of importance to the studies involving organic radicals. ... The samples were mounted in a cryostat and exposed to the beam of spin-polarized positive muons while an external magnetic field of 0.2 T was applied transverse to the muon (spin) beam direction. ... To correlate a positron decay with a muon incident on the sample, the experiment was run in time differential mode in which the incoming muon starts a clock at t = 0 and in so doing triggers a gate signal of 10 ?s length (a few muon lifetimes) during which no further muons can be counted. ...

Vasily S. Oganesyan; Andrew N. Cammidge; Gareth A. Hopkins; Fiona M. Cotterill; Ivan D. Reid; Upali A. Jayasooriya

2004-02-17T23:59:59.000Z

53

Muon systems  

SciTech Connect

The designs of both the GEM and SDC muon systems an the technological choices are reviewed. In particular, the chamber options for the detectors are discussed.

Bensinger, J.

1991-10-01T23:59:59.000Z

54

The Muon Anomalous Magnetic Moment  

E-Print Network (OSTI)

The calculations entering the prediction of the standard model value for the anomalous magnetic moment of the muon $a_\\mu$ are reviewed, and compared to the very accurate experimental measurement. The situation for the electron is discussed in parallel.

Knecht, Marc

2014-01-01T23:59:59.000Z

55

Muon Collider  

SciTech Connect

Parameters are given of muon colliders with center of mass energies of 1.5 and 3 TeV. Pion production is from protons on a mercury target. Capture, decay, and phase rotation yields bunch trains of both muon signs. Six dimensional cooling reduces the emittances until the trains are merged into single bunches, one of each sign. Further cooling in 6 dimensions is then applied, followed by final transverse cooling in 50 T solenoids. After acceleration the muons enter the collider ring. Ongoing R&D is discussed.

Palmer, R.

2009-10-19T23:59:59.000Z

56

Electron muon identification by atmospheric shower and electron beam in a new concept of an EAS detector  

E-Print Network (OSTI)

We present results demonstrating the time resolution and $\\mu$/e separation capabilities with a new concept of an EAS detector capable for measurements of cosmic rays arriving with large zenith angles. This kind of detector has been designed to be a part of a large area (several square kilometers) surface array designed to measure Ultra High Energy (10-200 PeV) $\\tau$ neutrinos using the Earth-skimming technique. A criteria to identify electron-gammas is also shown and the particle identification capability is tested by measurements in coincidence with the KASKADE-GRANDE experiment in Karlsruhe, Germany.

Iori, M; Yilmaz, A; Ferrarotto, F; Russ, J

2015-01-01T23:59:59.000Z

57

1 Industrial Electron Accelerators type ILU for Industrial Technologies  

E-Print Network (OSTI)

1 Industrial Electron Accelerators type ILU for Industrial Technologies The present work describes industrial electron accelerators of the ILU family. Their main parameters, design, principle of action the pulse linear accelerators type ILU are developed and supplied to the industry. The ILU machines

58

Preparations for Measurement of Electroweak Boson Production Cross-Sections using the Electron Decay Modes, with the Compact Muon Solenoid Detector  

E-Print Network (OSTI)

The Compact Muon Solenoid was designed to make discoveries at the TeV scale : to elucidate the nature of electroweak symmetry breaking and to search for physics beyond the Standard Model. For any such discovery to be credible, it must first be demonstrated that the CMS detector is understood. One mechanism to make this demonstration is to measure “standard candle” processes, such as W and Z production. This thesis describes preparations undertaken to make these measurements using the electron decay modes, with an integrated luminosity of 10 inverse picobarns of collision data. The energy resolution of the electromagnetic calorimeter was measured in test beam data. An improved method of deriving the optimised weights necessary for amplitude reconstruction is described. The measurement of electron charge using tracks is impaired by the electron showering in the tracker material. A novel charge measurement technique that is complementary to the existing method was assessed. Missing transverse energy is a pow...

Wardrope, D R

2009-01-01T23:59:59.000Z

59

On the muon neutrino mass  

E-Print Network (OSTI)

During the runs of the PS 179 experiment at LEAR of CERN, we photographed an event of antiproton-Ne absorption, with a complete pi+ -> mu+ ->e+ chain. From the vertex of the reaction a very slow energy pi+ was emitted. The pi+ decays into a mu+ and subsequently the mu+ decays into a positron. At the first decay vertex a muon neutrino was emitted and at the second decay vertex an electron neutrino and a muon antineutrino. Measuring the pion and muon tracks and applying the momentum and energy conservation and using a classical statistical interval estimator, we obtained an experimental upper limit for the muon neutrino mass: m_nu < 2.2 MeV at a 90% confidence level. A statistical analysis has been performed of the factors contributing to the square value of the neutrino mass limit.

N. Angelov; F. Balestra; Yu. Batusov; A. Bianconi; M. P. Bussa; L. Busso; L. Ferrero; R. Garfagnini; I. Gnesi; E. Lodi Rizzini; A. Maggiora; D. Panzieri; G. Piragino; G. Pontecorvo; F. Tosello; L. Venturelli

2006-05-03T23:59:59.000Z

60

Magnetic Moment of the Positive Muon  

Science Journals Connector (OSTI)

The magnetic moment of the positive muon has been redetermined in terms of proton moments using a precession technique. The sensitivity achieved yields an error of 13 parts per million. The muons are stopped in various targets in a homogeneous magnetic field. The anisotropic distribution of the decay electrons relative to the muon spin direction permits the measurement of the spin precession frequency. The proton spin resonance is measured in the same field, yielding f?fp=3.18338±0.00004. This result may be combined with that of other experiments, the muon g factor, and the ratio of electron cyclotron frequency to proton resonance, fefp, to obtain a more precise evaluation of the muon mass in terms of electron masses. m?me equals 206.765±0.005.

David P. Hutchinson; Jack Menes; G. Shapiro; A. M. Patlach

1963-08-01T23:59:59.000Z

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


61

High energy leptons from muons in transit  

E-Print Network (OSTI)

The differential energy distribution for electrons and taus produced from lepton pair production from muons in transit through materials is numerically evaluated. We use the differential cross section to calculate underground lepton fluxes from an incident atmospheric muon flux, considering contributions from both conventional and prompt fluxes. An approximate form for the charged current differential neutrino cross section is provided and used to calculate single lepton production from atmospheric neutrinos. We compare the fluxes of underground leptons produced from incident muons with those produced from incident neutrinos and photons from muon bremsstrahlung. We discuss their relevance for underground detectors.

Alexander Bulmahn; Mary Hall Reno

2009-12-08T23:59:59.000Z

62

Muon Collider Progress: Accelerators  

E-Print Network (OSTI)

in Fig. 7. The muons lose energy in all three dimensions viaincrease the energy loss of high-energy muons compared withthat for low-energy muons. Conceptually, there are several

Zisman, Michael S.

2012-01-01T23:59:59.000Z

63

Muon Collider Progress: Accelerators  

E-Print Network (OSTI)

A N. V. Mokhov et al. , “Muon Collider Interaction RegionR. B. Palmer et al. , “Muon Colliders,” in the 9th AdvancedB. Palmer and R. Fernow, “Muon Collider Final Cooling in 30–

Zisman, Michael S.

2012-01-01T23:59:59.000Z

64

The Particle Adventure | What is the world made of? | Lepton type  

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

type conservation type conservation Lepton type conservation Leptons are divided into three lepton families: the electron and its neutrino, the muon and its neutrino, and the tau and its neutrino. We use the terms "electron number," "muon number," and "tau number" to refer to the lepton family of a particle. Electrons and their neutrinos have electron number +1, positrons and their antineutrinos have electron number -1, and all other particles have electron number 0. Muon number and tau number operate analogously with the other two lepton families. One important thing about leptons, then, is that electron number, muon number, and tau number are always conserved when a massive lepton decays into smaller ones. Let's take an example decay.

65

Kicked surface muon beams  

Science Journals Connector (OSTI)

The possibility of splitting a surface muon beam into three separate components using an ... and could be very effectively used to provide muons to time differential ?SR experiments.

J. L. Beveridge

1992-01-01T23:59:59.000Z

66

LINACS FOR FUTURE MUON FACILITIES  

SciTech Connect

Future Muon Colliders (MC) and Neutrino Factories (NF) based on muon storage rings will require innovative linacs to: produce the muons, cool them, compress longi-tudinally and ‘shape’ them into a beam and finally to rap-idly accelerate them to multi-GeV (NF) and TeV (MC) energies. Each of these four linac applications has new requirements and opportunities that follow from the na-ture of the muon in that it has a short lifetime (? = 2.2 ?sec) in its own rest frame, it is produced in a tertiary process into a large emittance, and its electron, photon, and neutrino decay products can be more than an annoy-ance. As an example, for optimum performance, the linac repetition rates should scale inversely with the laboratory lifetime of the muon in its storage ring, something as high as 1 kHz for a 40 GeV Neutrino Factory or as low as 20 Hz for a 5 TeV Muon Collider. A superconducting 8 GeV Linac capable of CW operation is being studied as a ver-satile option for muon production [1] for colliders, facto-ries, and muon beams for diverse purposes. A linac filled with high pressure hydrogen gas and imbedded in strong magnetic fields has been proposed to rapidly cool muon beams [2]. Recirculating Linear Accelerators (RLA) are possible because muons do not generate significant syn-chrotron radiation even at extremely high energy and in strong magnetic fields. We will describe the present status of linacs for muon applications; in particular the longitu-dinal bunch compression in a single pass linac and multi-pass acceleration in the RLA, especially the optics and technical requirements for RLA designs, using supercon-ducting RF cavities capable of simultaneous acceleration of both ?+ and ?? species, with pulsed linac quadrupoles to allow the maximum number of passes. The design will include the optics for the multi-pass linac and droplet-shaped return arcs.

Slawomir Bogacz, Rolland Johnson

2008-10-01T23:59:59.000Z

67

Prompt GeV-TeV Emission of Gamma-Ray Bursts Due to High-Energy Protons, Muons and Electron-Positron Pairs  

E-Print Network (OSTI)

In the framework of the internal shock scenario, we model the broadband prompt emission of gamma-ray bursts (GRBs) with emphasis on the GeV-TeV bands, utilizing Monte Carlo simulations that include various processes associated with electrons and protons accelerated to high energies. While inverse Compton emission from primary electrons is often dominant, different proton-induced mechanisms can also give rise to distinct high-energy components, such as synchrotron emission from protons, muons or secondary electrons/positrons injected via photomeson interactions. In some cases, they give rise to double spectral breaks that can serve as unique signatures of ultra-high-energy protons. We discuss the conditions favorable for such emission, and how they are related to the production of ultra-high-energy cosmic rays and neutrinos in internal shocks. Ongoing and upcoming observations by {\\it GLAST}, atmospheric Cerenkov telescopes and other facilities will test these expectations and provide important information on the physical conditions in GRB outflows.

Katsuaki Asano; Susumu Inoue

2007-05-21T23:59:59.000Z

68

Direct pair production by high energy muons  

Science Journals Connector (OSTI)

A multiplate cloud chamber was operated 1032ft...undergound to study electromagnetic interactions of fast cosmic ray muons. 222 electron showers were observed. A histogram was obtained for transferred energies fr...

J. F. Gaebler; W. E. Hazen; A. Z. Hendel

1961-01-16T23:59:59.000Z

69

Muon Capture on the Proton  

E-Print Network (OSTI)

The MuCap experiment measures the singlet rate Lambda_S of muon capture on the proton. A negative muon beam is stopped in a time projection chamber filled with ultra-pure hydrogen gas at 10 bar and room temperature. In combination with the surrounding decay electron detectors, the lifetime of muons in hydrogen can be measured to determine LS to a final precision of 1%. The capture rate is then used to derive the nucleon's pseudoscalar form factor gP. Our first-stage result, gP= 7.3\\pm1., will soon be updated with the final analysis of the full statistics reducing the error by a factor of ~2.

P. Winter

2011-10-23T23:59:59.000Z

70

Law of Conservation of Muons  

DOE R&D Accomplishments (OSTI)

A multiplicative selection rule for mu meson-electron transitions is proposed. A "muon parity" = -1 is considered for the muon and its neutrino, while the "muon parity" for all other particles is +1. The selection rule then states that (-1) exp(no. of initial (-1) parity particles) = (-1) exp(no. of final (-1) parity particles). Several reactions that are forbidden by an additive law but allowed by the multiplicative law are suggested; these reactions include mu{sup +} .> e{sup +} + nu{sub mu} + {ovr nu}{sub e}, e{sup -} + e{sup -} .> mu{sup -} + mu{sup -}, and muonium .> antimuonium (mu{sup +} + e{sup -} .> mu{sup -} + e{sup +}). An intermediate-boson hypothesis is suggested. (T.F.H.)

Feinberg, G.; Weinberg, S.

1961-02-00T23:59:59.000Z

71

ESTIMATION OF THE MEAN ENERGY OF MUONS IN MULTILAYER DETECTORS  

E-Print Network (OSTI)

The technique of muon mean energy determination in multilayer detectors is developed. The mean energy is measured by means of average small bursts $m$ i.e. the number of electrons and positrons generated by muons in the detecting layers of device via three basic processes --- creation of $e^+e^-$ pairs, $\\delta$-electrons and bremsestrahlung. The accuracy of the method is considered. Key words: muon energy, multilayer detectors.

T. T. BARNAVELI; Yu. G. VERBETSKY; I. V. KHALDEEVA; N. A. ERISTAVI

1995-05-30T23:59:59.000Z

72

A measurement of hadron production cross sections for the simulation of accelerator neutrino beams and a search for muon-neutrino to electron-neutrino oscillations in the delta m**2 about equals 1-eV**2 region  

SciTech Connect

A measurement of hadron production cross-sections for the simulation of accelerator neutrino beams and a search for muon neutrino to electron neutrino oscillations in the {Delta}m{sup 2} {approx} 1 eV{sup 2} region. This dissertation presents measurements from two different high energy physics experiments with a very strong connection: the Hadron Production (HARP) experiment located at CERN in Geneva, Switzerland, and the Mini Booster Neutrino Experiment (Mini-BooNE) located at Fermilab in Batavia, Illinois.

Schmitz, David W.; /Columbia U.

2008-01-01T23:59:59.000Z

73

Atmospheric Muons and Neutrinos  

Science Journals Connector (OSTI)

......parameters to reproduce the observed muon energy spectrum in a certain zenithal...If we restrict ourselves to the muons of energy greater than, say, 5 GeV, we...parameters to reproduce the observed muon energy spectrum in a certain zenithal......

Masatoshi Koshiba

1969-03-01T23:59:59.000Z

74

Muon trapping at monovacancies in iron  

Science Journals Connector (OSTI)

Positive-muon—spin-rotation experiments were performed on electron irradiated iron. A new defect-associated frequency is observed which is assigned to muons trapped at monovacancies. The hyperfine field at the vacancy site is -0.956 T at 140 K. The diffusion constant for ?+ in iron deduced from the trapping rate follows an Arrhenius law with an activation energy of 38±3 meV between 90 and 190 K.

A. Möslang; H. Graf; G. Balzer; E. Recknagel; A. Weidinger; Th. Wichert; R. I. Grynszpan

1983-03-01T23:59:59.000Z

75

SNM detection by active muon interrogation  

SciTech Connect

Muons are charged particles with mass between the electron and proton and can be produced indirectly through pion decay by interaction of a charged-particle beam with a target. There are several distinct features of the muon interaction with matter attractive as a probe for detection of SNM at moderate ranges. These include muon penetration of virtually any amount of material without significant nuclear interaction until stopped by ionization loss in a short distance. When stopped, high-energy penetrating x-rays (in the range of 6 MeV for uranium,) unique to isotopic composition are emitted in the capture process. The subsequent interaction with the nucleus produces additional radiation useful in assessing SNM presence. A focused muon beam can be transported through the atmosphere, at a range limited mainly by beam-size growth through scattering. A muonbeam intensity of > 10{sup 9} /second is required for efficient interrogation and, as in any other technique, dose limits are to be respected. To produce sufficient muons a high-energy (threshold {approx}140 MeV) high-intensity (<1 mA) proton or electron beam is needed implying the use of a linear accelerator to bombard a refractory target. The muon yield is fractionally small, with large angle and energy dispersion, so that efficient collection is necessary in all dimensions of phase space. To accomplish this Los Alamos has proposed a magnetic collection system followed by a unique linear accelerator that provides the requisite phase-space bunching and allows an energy sweep to successively stop muons throughout a large structure such as a sea-going vessel. A possible maritime application would entail fitting the high-gradient accelerators on a large ship with a helicopter-borne detection system. We will describe our experimental results for muon effects and particle collection along with our current design and program for a muon detection system.

Jason, Andrew J [Los Alamos National Laboratory; Miyadera, Haruo [Los Alamos National Laboratory; Turchi, Peter J [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

76

Muon Spin Rotation of Carbonyl Compounds, an Exploration of the Mechanism of Hyperfine Interaction  

Science Journals Connector (OSTI)

Detection and characterization of radical species with exceptional sensitivity is now possible using spin-polarized muons and single-particle counting techniques.1 The acronym ?SR stands for muon spin rotation, relaxation, and resonance, covering the various ways in which the evolution of the muon polarization is studied. ... The muon spin plays the role of a nuclear spin, but the spectroscopy proves to be equally sensitive both to muons in electronically diamagnetic environments and to those which experiences a hyperfine coupling with paramagnetic electrons, the latter being of importance to the strategies involving organic radicals. ... To correlate a positron decay with a muon incident on the sample, the experiment was run in time differential mode, in which the incoming muon starts a clock at t = 0 and, in so doing, triggers a gate signal of 10 ?s length (a few muon lifetimes) during which no further muons can be counted. ...

John A. Stride; Upali A. Jayasooriya; Ivan D. Reid

2001-12-14T23:59:59.000Z

77

Energy spectrum and angular distribution of muons from the decay of heavy leptons produced in colliding electron-positron beams  

Science Journals Connector (OSTI)

On the basis of an arbitrary (V, A) structure of the neutral weak ¯ee and LL currents (L=??, M0) a study is made of the processes of production in colliding electron-positron beams of pairs of heavy leptons with ...

T. M. Aliev; N. A. Guliev; I. G. Dzhafarov; F. T. Khalil-Zade

1981-02-01T23:59:59.000Z

78

Muon Front End for a Neutrino Factory and Muon Collider  

E-Print Network (OSTI)

Muon Front End for a Neutrino Factory and Muon Collider Chris Rogers, ASTeC, Rutherford Appleton Laboratory 15th January 2013 #12;High Energy Muon Facilities Growing interest in large, high energy muon facilities Neutrino Factory -> neutrino oscillations and Muon Collider -> energy frontier or Higgs factory

McDonald, Kirk

79

AN INTENSE LOW ENERGY MUON SOURCE FOR THE MUON COLLIDER  

E-Print Network (OSTI)

AN INTENSE LOW ENERGY MUON SOURCE FOR THE MUON COLLIDER D. Taqqu Paul Scherrer Institut, Villigen, CH Abstract A scheme for obtaining an intense source of low energy muons is described. It is based of the decay muons an intense intermediate energy muon beam is obtained. For the specific case of negative

McDonald, Kirk

80

Simulation of low energy muon frictional cooling  

Science Journals Connector (OSTI)

Frictional cooling is a proposed method of phase space reduction for a potential muon beam intended for collisions. The basic principle involves compensating for the muon energy loss in media by a constant electric field. The muons are in an energy regime below the ionization peak which for muons in helium is less than 10 keV . Electronic energy loss is treated as a continuous process and all individual nuclear scatters with scattering angles greater than 50 mrad are simulated as discrete processes. Other effects like the Barkas [W.H. Barkas, W. Birnbaum, F.M. Smith, Phys. Rev. 101 (1956) 778.] effect and Muonium formation are also included. The results of our simulations are summarized.

R. Galea; A. Caldwell; S. Schlenstedt; H. Abramowicz

2006-01-01T23:59:59.000Z

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


81

Characteristics of the electron traps produced by electron irradiation in n-type germanium  

Science Journals Connector (OSTI)

The free energies of ionization, the emission rates, and the cross sections for electron trapping have been measured for the four majority carrier traps which are produced in n-type germanium by electron irradiation at room temperature and which are stable at this temperature. These traps, labeled E1, E2, E4, and E5, which exhibit an emission rate of 140 s-1 at 145, 200, 185, and 170 K, are situated at 260, 410, 380, and 370 meV below the conduction band, respectively. The variations of the electron-capture cross sections versus temperature, characterized by the following activation energies: 65, 120, 80, and 50 meV, respectively, indicate that nonradiation recombination occurs through multiphonon emission. From the values of the free energies of ionization and from the variation of the emission rates with temperature, the enthalpies and entropies of ionization have been deduced.

F. Poulin and J. C. Bourgoin

1982-12-15T23:59:59.000Z

82

MUON SCATTERING INTO 1-5 MUON FINAL STATES  

E-Print Network (OSTI)

MUON SCATTERING INTO1 - 5 MUON FINAL STATES Physics Depar~ment and Lawrenceof 209-GeV and 90-GeV muons within a magnetized~steel

Clark, A.R.

2010-01-01T23:59:59.000Z

83

muon Collider Notes  

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

Muon Collider Notes Muon Collider Notes MC-001 D. Neuffer, "Colliding Muon Beams at 90 GeV" Fermilab Note FN-319, July 1979. MC-002 D. Neuffer, "Principles and Applications of Muon Cooling" Proc. of the 12th International Conf. on High-Energy Accelerators, p. 481, 1983. MC-003 V.V. Parkhomchuk and A.N. Skrinsky, "Ionization Cooling: Physics and Applications" Proc. of the 12th International Conf. on High-Energy Accelerators, p. 485, 1983. MC-004 E.A. Perevedentsev and A.N. Skrinsky, "On the Proton Klystron" Proc. of the 12th International Conf. on High-Energy Accelerators, p. 508, 1983. MC-005 D. Neuffer, "Principles and Applications of Muon Cooling" Particle Accelerators, Vol. 14, p. 75, 1983. MC-006 D. Neuffer, "Multi-TeV Muon Colliders" Proc. of the Advanced

84

Muon Cooling: Longitudinal Compression  

Science Journals Connector (OSTI)

A 10??MeV/c positive muon beam was stopped in helium gas of a few mbar in a magnetic field of 5 T. The muon “swarm” has been efficiently compressed from a length of 16 cm down to a few mm along the magnetic field axis (longitudinal compression) using electrostatic fields. The simulation reproduces the low energy interactions of slow muons in helium gas. Phase space compression occurs on the order of microseconds, compatible with the muon lifetime of 2???s. This paves the way for the preparation of a high-quality low-energy muon beam, with an increase in phase space density relative to a standard surface muon beam of 107. The achievable phase space compression by using only the longitudinal stage presented here is of the order of 104.

Yu Bao; Aldo Antognini; Wilhelm Bertl; Malte Hildebrandt; Kim Siang Khaw; Klaus Kirch; Angela Papa; Claude Petitjean; Florian M. Piegsa; Stefan Ritt; Kamil Sedlak; Alexey Stoykov; David Taqqu

2014-06-04T23:59:59.000Z

85

Muon Capture and Nuclear Structure  

Science Journals Connector (OSTI)

We have studied the fundamental muon-nucleon interaction from the muon capture in gaseous and molecular hydrogen and ... problem upon the knowledge of the former from muon captures in C12 and O16.

M. Morita; H. Ohtsubo; A. Fujii

1970-01-01T23:59:59.000Z

86

Measurement of the Michel parameter rho in muon decay  

E-Print Network (OSTI)

The TWIST Collaboration has measured the Michel parameter rho in normal muon decay,u+ -> e+VeVu. In the standard model of particle physics,rho = 3/4. Deviations from this value require mixing of left- and right-handed muon and electron couplings...

Musser, James Raymond

2006-04-12T23:59:59.000Z

87

Rare muon processes  

SciTech Connect

The status of rare muon processes as tests of the standard model is reviewed with the emphasis on results that are expected from experiments in the near future.

Cooper, M.D.; The MEGA Collaboration

1993-05-01T23:59:59.000Z

88

Rare muon processes  

SciTech Connect

The status of rare muon processes as tests of the standard model is reviewed with the emphasis on results that are expected from experiments in the near future.

Cooper, M.D.

1993-01-01T23:59:59.000Z

89

Muon spin rotation  

Science Journals Connector (OSTI)

... vast funding accorded high energy physics research in recent years.?SR-the acronym stands for Muon Spin Rotation, Relaxation, Resonance, Research or what have you, and refers to the ... the most promising new work related to purely chemical problems. Indeed, the use of muons in chemistry is striking not only for providing yet another probe of chemical systems, ...

G. C. Stirling

1978-11-23T23:59:59.000Z

90

Muon Decay Deep Underground  

Science Journals Connector (OSTI)

A measurement of delayed coincidences characteristic of muon decay has been made at a depth of 1440-hg/cm2 standard rock with a 200-liter liquid scintillation detector. These results are consistent with the decay rate predicted from the depth-intensity curve for the penetrating component of the cosmic rays, providing independent evidence that this component is energetic muons.

W. R. Kropp; Jr.; F. Reines; R. M. Woods; Jr.

1968-06-17T23:59:59.000Z

91

Muons and Neutrinos 2007  

E-Print Network (OSTI)

This paper is the written version of the rapporteur talk on Section HE-2, muons and neutrinos, presented at the 30th International Cosmic Ray Conference, Merida, Yucatan, July 11, 2007. Topics include atmospheric muons and neutrinos, solar neutrinos and astrophysical neutrinos as well as calculations and instrumentation related to these topics.

Thomas K. Gaisser

2008-01-29T23:59:59.000Z

92

OVERVIEW OF A MUON CAPTURE SECTION FOR MUON ACCELARATORS*  

E-Print Network (OSTI)

OVERVIEW OF A MUON CAPTURE SECTION FOR MUON ACCELARATORS* Diktys Stratakis# , J. Scott Berg, H Snopok, Illinois Institute of Technology, Chicago, IL, USA Abstract We describe a muon capture section to manipulate the longitudinal and transverse phase-space to collect efficiently a muon beam produced from

McDonald, Kirk

93

Muon Capture in Gaseous Deuterium  

Science Journals Connector (OSTI)

We report the results of an experiment performed to measure the muon nuclear capture rate by free deuterons. The muons were slowed down in ultrapure gaseous hydrogen at 7.6 atm and 293 °K, containing 5% of deuterium. A special target was used, in which a system of gas proportional counters, working with the (H2 + D2) gaseous mixture itself, was operating. Neutrons from the capture reactions were detected using liquid scintillation counters, and the ?-ray background was eliminated by pulse-shape discrimination. The experimental result is ?exp=(445±60) sec-1, which is consistent with muon-electron universality and with the assumption that the nuclear capture proceeds from the doublet spin state of the ?d muonic atoms. Combining the present experimental value with a previous result obtained with a liquid-hydrogen deuterated target, one obtains a ratio between the axial-vector and vector coupling constants given by gA,?gV,?=-1.35±0.1.

A. Bertin; A. Vitale; A. Placci; E. Zavattini

1973-12-01T23:59:59.000Z

94

Papers on Muon Colliders  

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

Magnets for Muon Collider and Neutrino Storage Ring Magnets for Muon Collider and Neutrino Storage Ring (and Open Midplane Dipole for LARP): R. Gupta, et al., "High Field HTS Solenoid for a Muon Collider – Demonstrations, Challenges and Strategies, MT23, July 2013", presented at MT23, (talk) R. Weggel et al., "Open Midplane Dipoles for Muon Collider", 2011 Particle Accelerator Conference, New York (POSTER).. R. Gupta, M. Anerella, A. Ghosh, H. Kirk, R. Palmer, S. Plate, W. Sampson, Y. Shiroyanagi, P. Wanderer, B. Brandt, D. Cline, A. Garren, J. Kolonko, R. Scanlan, R. Weggel, "High field HTS R&D solenoid for muon collider", 2010 Applied Superconductivity Conference, Washington, DC, August 2010 >> Y. Shiroyanagi, W. Sampson, A. Ghosh, R. Gupta, "The Construction and

95

Free Muons and Muonium - Some Achievements and Possibilities in Low Energy Muon Physics  

E-Print Network (OSTI)

Some recent precision experiments in low energy muon physics are discussed. Spectroscopy on the muonium atom, the bound state of a positve muon and an electron, has provided precise tests of standard theory and yielded most precise values of important fundamental constants. A search for spontaneous muonium to antimuonium conversion test lepton flavour conservation and yields most stringent limits on parameters in several speculative models. The muon magnetic anomaly may contain hints to new physics and is a relevant calibration point for numerous models beyond standard theory. Since most precision experiments are limited by the particle fluxes at present muon sources, possibilities in this field are shown which will emerge at upgraded present facilities or new accelerator complexes under construction or planning. At such places novel techniques would be enabled.

Klaus P. Jungmann

2002-10-16T23:59:59.000Z

96

Dose from slow negative muons  

Science Journals Connector (OSTI)

......radiation with emphasis on low energy muons are scarce. Pelliccioni(7...for incoming 1 and 10 MeV muons. Muon energy 1 MeV 10 MeV H*(10)/phi...scoring volume dimensions. When the muon energy increases to 10 MeV, they penetrate......

T. Siiskonen

2008-01-01T23:59:59.000Z

97

Muon g-2  

E-Print Network (OSTI)

The muon g-2 collaboration has measured the anomalous magnetic g value of the positive muon to within a relative uncertainty of 0.7 parts per million. The result, a_{\\mu^+} = 11 659 204(7)(5) x 10^{-10} is in good agreement with the preceding data on a_{\\mu^+} and a_{\\mu^-} and has about twice smaller uncertainty. The measurement tests standard model theory, which at the level of the experimental uncertainty involves quantum electrodynamics, quantum chromodynamics, and electroweak interaction in significant ways. The analysis of the anomalous magnetic g value of the negative muon is well underway.

Ernst Sichtermann; for the g-2 collaboration

2003-09-02T23:59:59.000Z

98

Fermilab | Muon Collider | How Does a Muon Collider Work?  

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

A muon collider complex would comprise several machines and many different A muon collider complex would comprise several machines and many different components. Scientists across the world are developing and testing them. View full graphic How Does a Muon Collider Work? A muon collider complex would comprise several machines and many different components. Scientists across the world are developing and testing them. Proton accelerator To create lots of muons, scientists use a high-intensity proton accelerator that steers protons into a target. The collisions create short-lived particles called pions. Within 50 meters the pions decay into muons and neutral particles called neutrinos. The muons have an energy of about 200 MeV. Capture cavities Magnets guide the muons into and through a set of radiofrequency cavities. The electric field inside the cavities increases the energy of slow muons

99

Muon Fluence Measurements for Homeland Security Applications  

SciTech Connect

This report focuses on work conducted at Pacific Northwest National Laboratory to better characterize aspects of backgrounds in RPMs deployed for homeland security purposes. Two polyvinyl toluene scintillators were utilized with supporting NIM electronics to measure the muon coincidence rate. Muon spallation is one mechanism by which background neutrons are produced. The measurements performed concentrated on a broad investigation of the dependence of the muon flux on a) variations in solid angle subtended by the detector; b) the detector inclination with the horizontal; c) depth underground; and d) diurnal effects. These tests were conducted inside at Building 318/133, outdoors at Building 331G, and underground at Building 3425 at Pacific Northwest National Laboratory.

Ankney, Austin S.; Berguson, Timothy J.; Borgardt, James D.; Kouzes, Richard T.

2010-08-10T23:59:59.000Z

100

Electron Plasma Oscillations Associated with Type III Radio Bursts  

Science Journals Connector (OSTI)

...interactions of the plasma oscillations with...propagat-ing electron plasma oscillations. Radia-tion...frequencies (5 1 Mhz) the harmonic radiation...Since the electron plasma oscillations )N...about 10 mv m-1 or larger are required to explain...and the solid black area inyears of measurements...

DONALD A. GURNETT; ROGER R. ANDERSON

1976-12-10T23:59:59.000Z

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


101

Electron Plasma Oscillations Associated with Type III Radio Bursts  

Science Journals Connector (OSTI)

...the radiation 178 kHz ( 8%) _ at the...propagat-ing electron plasma oscillations. Radia-tion...and the har--kHz % monic has been...frequencies (5 1 Mhz) the harmonic radiation...Since the electron plasma oscillations )N PLASMA 56.2 kHz ( 8%) are local...

DONALD A. GURNETT; ROGER R. ANDERSON

1976-12-10T23:59:59.000Z

102

Vertical minority carrier electron transport in p-type InAs/GaSb type-II superlattices  

E-Print Network (OSTI)

Vertical minority carrier electron transport in p-type InAs/GaSb type-II superlattices G. A. Umana transport J. Appl. Phys. 112, 123715 (2012) Characteristics of built-in polarization potentials Appl. Phys. Lett. 101, 243113 (2012) Thermal stability of the deep ultraviolet emission from Al

Krishna, Sanjay

103

Towards a Muon Collider  

SciTech Connect

A multi TeV Muon Collider is required for the full coverage of Terascale physics. The physics potential for a Muon Collider at {approx}3 TeV and integrated luminosity of 1 ab{sup -1} is outstanding. Particularly strong cases can be made if the new physics is SUSY or new strong dynamics. Furthermore, a staged Muon Collider can provide a Neutrino Factory to fully disentangle neutrino physics. If a narrow s-channel resonance state exists in the multi-TeV region, the physics program at a Muon Collider could begin with less than 10{sup 31} cm{sup -2} s{sup -1} luminosity. Detailed studies of the physics case for a 1.5-4 TeV Muon Collider are just beginning. The goals of such studies are to: (1) identify benchmark physics processes; (2) study the physics dependence on beam parameters; (3) estimate detector backgrounds; and (4) compare the physics potential of a Muon Collider with those of the ILC, CLIC and upgrades to the LHC.

Eichten, E.; /Fermilab

2011-08-01T23:59:59.000Z

104

Muon Identification in the ATLAS Calorimeters  

E-Print Network (OSTI)

Muon Identification in the ATLAS Calorimeters #12;#12;Muon Identification in the ATLAS Calorimeters . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.2.3 Muon spectrometer . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2.2.4 The forward . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.2.6 The trigger system . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3 Muon

van Suijlekom, Walter

105

On the energy range relation for fast muons in rock  

Science Journals Connector (OSTI)

A discussion is given of the best estimate of various types of energy loss; the energy-range relation for muons in rock and water is then evaluated....?6 g?1 cm2 fractional «nuclear» energy losses respectively; w...

M. Mandò; L. Ronchi

1952-01-01T23:59:59.000Z

106

Contribution of prompt muon production to total muon fluxes  

Science Journals Connector (OSTI)

The flux of prompt cosmic-ray muons coming from charmed particles which are produced ... compare the observed results on angular distributions of muon intensities at a given depth with the ... . There is no clear...

H. Inazawa; K. Kobayakawa; T. Kitamura

107

Underground muon energy spectrum and its relevance for muon astronomy  

Science Journals Connector (OSTI)

A striking result from the NUSEX (1) and SOUDAN (2...) experiments is the discovery of a high flux of muons from the direction of Cygnus X-3 ... source. The differential energy spectrum of these muons is much fla...

A. Castellina; B. D’Ettorre Piazzoli; G. Mannocchi…

1985-11-16T23:59:59.000Z

108

Muon spectrum and convoy effects after muon-catalyzed fusion  

Science Journals Connector (OSTI)

We study final-state interactions of the muon after muon-catalyzed D-T fusion reaction with the ? particle and with target matter. The yield of convoy muons, traveling with the ? particle but remaining unbound is calculated. Energy loss in the dense target may lead to capture of a fraction of these muons into outer shells of the ? particle. We show that the final capture probability can be strongly density dependent.

B. Müller; H. E. Rafelski; J. Rafelski

1989-09-01T23:59:59.000Z

109

Polarized Muon Decay at Rest with V+A Interaction  

E-Print Network (OSTI)

In this paper, we analyze the polarized muon decay at rest (PMDaR) and elastic neutrino-electron scattering (ENES) admitting the non-standard V+A interaction in addition to standard V-A interaction. Considerations are made for Dirac massive muon neutrino and electron antineutrino. Moreover, muon neutrinos are transversely polarized. It means that the outgoing muon-neutrino beam is a mixture of the left- and right-chirality muon neutrinos and has a fixed direction of transverse spin polarization with respect to production plane. We show that the angle-energy distribution of muon neutrinos contains the interference terms between the standard V-A and exotic V+A couplings, which are proportional to the transverse components of muon neutrino spin polarization. They do not vanish in a limit of massless neutrino and include the relative phases to test the CP violation. In consequence, it allows to calculate a neutrino flux and an expected event number in the ENES (detection process) both for the standard model prediction and the case of neutrino left-right mixture.

W. Sobków; S. Ciechanowicz; M. Misiaszek

2011-02-07T23:59:59.000Z

110

Novel Muon Beam Facilities for Project X at Fermilab  

SciTech Connect

Innovative muon beam concepts for intensity-frontier experiments such as muon-to-electron conversion are described. Elaborating upon a previous single-beam idea, we have developed a design concept for a system to generate four high quality, low-energy muon beams (two of each sign) from a single beam of protons. As a first step, the production of pions by 1 and 3 GeV protons from the proposed Project X linac at Fermilab is being simulated and compared with the 8-GeV results from the previous study.

Neuffer, D.V.; /Fermilab; Ankenbrandt, C.M.; Abrams, R.; Roberts, T.J.; Yoshikawa, C.Y.; /MUONS Inc., Batavia

2012-05-01T23:59:59.000Z

111

Muon Identification at the Tevatron  

Science Journals Connector (OSTI)

The muon detection and identification schemes for the CDF ... Fermilab Tevatron are described. Both experiments detect muons through the use of scintillation counters and ... surrounding a central tracker. Three ...

2006-01-01T23:59:59.000Z

112

Radiative muon capture  

Science Journals Connector (OSTI)

It is shown by relating the transition amplitude of radiative muon capture to that of radiative pion capture, that the transition amplitude of radiative muon capture proposed recently by Hwang and Primakoff differs from the others mainly by Low's counter terms. Despite the fact that the "original" transition amplitude does not violate seriously the conservation of the hadronic electromagnetic current, Low's counter terms, as introduced via Low's prescription to secure the presence of small conservation-of-hadronic-electromagnetic-current-breaking terms, are confirmed to be of numerical importance. Further, it is found in the "elementary-particle" treatment of radiative muon capture that the uncertainty arising from the nuclear structure can be reduced to become negligible. Therefore, an exclusive radiative muon capture experiment can in principle differentiate the Hwang-Primakoff theory from the others and yet provide a comprehensive test of partial conservation of axial-vector current.RADIOACTIVITY Theories of radiative muon capture, linearity hypothesis versus Low's prescription; nuclear structure and PCAC.

W -Y. P. Hwang

1980-07-01T23:59:59.000Z

113

Accelerator Preparations for Muon Physics Experiments at Fermilab  

SciTech Connect

The use of existing Fermilab facilities to provide beams for two muon experiments - the Muon to Electron Conversion Experiment (Mu2e) and the New g-2 Experiment - is under consideration. Plans are being pursued to perform these experiments following the completion of the Tevatron Collider Run II, utilizing the beam lines and storage rings used today for antiproton accumulation without considerable reconfiguration. Operating scenarios being investigated and anticipated accelerator improvements or reconfigurations will be presented.

Syphers, M.J.; /Fermilab

2009-10-01T23:59:59.000Z

114

Towards a compensatable Muon Collider calorimeter with manageable backgrounds  

SciTech Connect

Muon Collider detectors pose very challenging problems in detector technology due to extremely large backgrounds present in the detector volume as a result of muon decays. Current designs of a 750 GeV/c per beam Muon Collider envisage 4.28 x 10{sup 5} muon decays per meter in the beam pipe close to the interaction region. The decay electrons after intense shielding still manage to produce large backgrounds in the detector volume of low energy photons, neutrons and higher energy Bethe Heitler muons. There are 170/184/6.8/177 TeVs energy entering the detector volume per crossing due to EM particles/Muons/Mesons/Baryons respectively. We investigate the capabilities of an iron calorimeter with pixelated readout where each pixel gives a yes/no answer as to whether a charged particle passed through it or not, to solve this problem. Each pixel is individually triggered by a 'travelling gate trigger' with a gate of 2 ns where the beginning of the gate is the time of arrival of a light signal from the interaction region to the pixel. We show that such a calorimeter is compensatable and propose two schemes to compensate the digital output in software to improve the resolution of the calorimeter. We show that such a calorimeter is capable of digitizing physics signals from the interaction region and as a result, the backgrounds from the muon decays are much reduced and under control.

Raja, R.; /Fermilab

2012-04-01T23:59:59.000Z

115

Muon capture in hydrogen  

E-Print Network (OSTI)

Theoretical difficulties in reconciling the measured rates for ordinary and radiative muon capture are discussed, based on heavy-baryon chiral perturbation theory. We also examine ambiguity in our analysis due to the formation of p$\\mu$p molecules in the liquid hydrogen target.

S. Ando; F. Myhrer; K. Kubodera

2001-10-30T23:59:59.000Z

116

Majorons and muon decay  

Science Journals Connector (OSTI)

The existence of a massless Goldstone boson coupling to neutrinos in theories with spontaneous violation of a global B-L symmetry may be consequential in precision measurements of the parameters in muon decay. We calculate the decay parameters for ??eMM, where the Majoron M is the Goldstone boson, and discuss limits on the Majoron-neutrino coupling.

T. Goldman; Edward W. Kolb; G. J. Stephenson; Jr.

1982-11-01T23:59:59.000Z

117

Jack Steinberger and the Muon-Neutrino  

Office of Scientific and Technical Information (OSTI)

Jack Steinberger and the Muon-Neutrino Resources with Additional Information Jack Steinberger Photograph by Harry Sticker, courtesy AIP Emilio Segre Visual Archives, Physics Today Collection In an interview, Jack Steinberger spoke about his 1988 Nobel Prize winning research. He states "I did an experiment, together with several other people at Brookhaven National Laboratory ... which showed that there is a second kind of neutrino. The neutrino has elementary particles. Elementary particles exist in families of particles ... . At the time, the elementary particles which were involved were the electrons and the neutrino. ... [W]e required the [BNL] accelerator, which was the effort of very many people, ... and this allowed [us] to make a beam of these neutrinos, and we were able to convince ourselves that these neutrinos were not the same kind of neutrinos as those which had been seen before. They were associated with not electrons, but with something called [muons]. So we were able to understand that there is a different neutrino associated with the [muon] than with the electron.

118

A Compact and High Performance Muon Capture Channel for Muon Accelerators  

SciTech Connect

It is widely believed that a neutrino factory would deliver unparallel performance in studying neutrino mixing and would provide tremendous sensitivity to new physics in the neutrino sector. Here we will describe and simulate the front-end of the neutrino factory system, which plays critical role in determining the number of muons that can be accepted by the downstream accelerators. In this system, a proton bunch on a target creates secondaries that drift into a capture transport channel. A sequence of rf cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to nearly equal central energies, and initiates ionization cooling. For this, the muon beams are transported through sections containing high-gradient cavities and strong focusing solenoids. In this paper we present results of optimization and variation studies toward obtaining the maximum number of muons for a neutrino factory by using a compact transport channel. It has been suggested computationally and experimentally that the maximum achievable gradient is enhanced by introducing an external magnetic field at right angles to the rf electric field since it suppresses field-emission processes. Here, we have discussed a possible scheme for extending the concept of magnetic insulation to capture, transport, and cool muons in a neutrino factory. We incorporated this idea into a new lattice design where the rf cavities are shaped so that their walls were tangential to the magnetic-field lines. We showed that, with magnetic insulation, the field-emitted electrons impact the cavity surface with energies four orders-of-magnitude less than in conventional pillbox cavities; consequently, damage from field-emission is suppressed significantly. While demanding in terms of power requirements, this neutrino factory lattice showed satisfactory performance in both cooling and collecting the accepted muons within the requirements for the IDSNF. Optimizations were also made to reduce heating on the absorber windows minimizing losses in the accepted muon fluxes. The next step for verifying these ideas should be an experimental demonstration of a single muon accelerator magnetically-insulated rf cavity. A successful demonstration will provide us with a new versatile tool for a future muon accelerator.

Stratakis, D.; Gallardo, J.; Palmer, R.B.

2011-03-28T23:59:59.000Z

119

Muon Experiments Masaharu Aoki, Osaka University  

E-Print Network (OSTI)

Muon Experiments Masaharu Aoki, Osaka University NP02 International workshop on Nuclear and Particle Physics at 50-GeV PS Kyoto #12;_ The muon is the best place to search for new physics beyond the Standard Model. ­ Muon LFV Forbidden Process ­ Muon EDM Suppressed Process ­ Muon g-2 Precise Measurement

Roberts, B. Lee

120

Muon capture for the front end of a muon collider  

SciTech Connect

We discuss the design of the muon capture front end for a {mu}{sup +}-{mu}{sup -} Collider. In the front end, a proton bunch on a target creates secondary pions that drift into a capture transport channel, decaying into muons. A sequence of rf cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. The muons are then cooled and accelerated to high energy into a storage ring for high-energy high luminosity collisions. Our initial design is based on the somewhat similar front end of the International Design Study (IDS) neutrino factory.

Neuffer, D.; /Fermilab; Yoshikawa, C.; /MUONS Inc., Batavia

2011-03-01T23:59:59.000Z

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


121

Muon-Muon and Other High Energy Colliders  

Science Journals Connector (OSTI)

Before we discuss the muon collider in detail, it is useful to...(pp, $$p\\bar p$$ ), of lepton (e + e ...

R. B. Palmer; J. C. Gallardo

1997-01-01T23:59:59.000Z

122

Electromagnetic Interactions of High-Energy Muons  

Science Journals Connector (OSTI)

The production of knock-on electrons and of electron pairs by muons of mean energy >50 BeV has been measured from cloud-chamber photographs of soft showers produced in lead plates. The cloud chamber was operated at a depth of 8.42×104 g/cm2 underground. About half the data were taken while the cloud chamber was tilted 66° in order to favor observation of the high-average-energy muons that come in at large zenith angle. The energies of the electrons that initiated the showers was obtained from an experimental calibration (to be published). The shower energies that were studied extended from 85 MeV to about 104 MeV. The observed frequency is compared with the expected frequency calculated from the results of Bhabha for knock-on electrons and those of Zapolski and of Murota, Ueda, and Tanaka for electron pairs. The agreement is satisfactory except for knock-on electrons in the region of 109 eV, where the predicted frequency appears to be significantly lower than the observed frequency.

P. D. Kearney and W. E. Hazen

1965-04-12T23:59:59.000Z

123

Muon Collider design status  

SciTech Connect

Muon Collider (MC) - proposed by G.I. Budker and A.N. Skrinsky a few decades ago - is now considered as the most exciting option for the energy frontier machine in the post-LHC era. A national Muon Accelerator Program (MAP) is being formed in the USA with the ultimate goal of building a MC at the Fermilab site with c.o.m. energy in the range 1.5-3 TeV and luminosity of {approx} 1.5 {center_dot} 10{sup 34} cm{sup -2} s{sup -1}. As the first step on the way to MC it envisages construction of a Neutrino Factory (NF) for high-precision neutrino experiments. The baseline scheme of the NF-MC complex is presented and possible options for its main components are discussed.

Alexahin, Y.; /Fermilab

2010-09-01T23:59:59.000Z

124

Radiative Muon Capture  

Science Journals Connector (OSTI)

The theory of radiative muon capture is developed. The discussion includes both parity conserving and nonconserving effects. The Gell-Mann weak magnetic term and the induced pseudoscalar are included, along with comparable relativistic effects in the nucleons. The theory is applied to light nuclei and especially to the radiative Godfrey reaction ?-+C126??+?+B125. An experiment to detect the induced pseudoscalar directly is proposed.

Jeremy Bernstein

1959-08-01T23:59:59.000Z

125

Anomalous Interactions of High Energy Muons  

Science Journals Connector (OSTI)

......research-article Articles Anomalous Interactions of High Energy Muons Takashi Kitamura Reiji Sugano Department of Physics...on penetrating showers with large transferred energies producted by high energy muons are accepted, the muon would have anomalous......

Takashi Kitamura; Reiji Sugano

1966-11-01T23:59:59.000Z

126

Muon Collider Overview: Progress and Future Plans  

E-Print Network (OSTI)

NATIONAL LABORATORY Muon Collider Overview: Progress andCBP Note-263 BNL- 65627 Muon Collider Overview: Progress and9] 5 REFERENCES [1] Status of the Muon Collider Research and

Palmer, R.

2008-01-01T23:59:59.000Z

127

Muon Simulation at the Daya Bay SIte  

E-Print Network (OSTI)

Muon simulation at the Daya Bay site Guan Mengyun ? Caowe simulated the underground muon background at the Daya Baysite. To get the sea-level muon ?ux parameteri- zation, a

Mengyun, Guan

2011-01-01T23:59:59.000Z

128

Muon Capture by the Triton  

Science Journals Connector (OSTI)

Muon capture by the triton is investigated. "Exact" ground-state wave functions extracted from realistic nucleon-nucleon interactions are incorporated in the calculations. The treatment involves non-energy-weighted sum rules and explicit introduction of the three-neutron final state. Beside results on muon capture by He3, a lower limit is established for the muon-capture rate in H3.

J. Torre; Cl. Gignoux; G. Goulard

1978-02-20T23:59:59.000Z

129

Precise Timing Adjustment for the ATLAS Level1 Endcap Muon Trigger System , O. Sasakia  

E-Print Network (OSTI)

Precise Timing Adjustment for the ATLAS Level1 Endcap Muon Trigger System Y. Suzukia , O. Sasakia by Yu Suzuki yu.suzuki@cern.ch Abstract The ATLAS level-1 endcap muon trigger system consists of about alignment of individual channels with the timing adjust- ment facility embedded in the TGC electronics

Fukunaga, Chikara

130

muon_collider  

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

muon_collider muon_collider muon_collider FridayMeetings MCTFmeetings MondayMeetings prstab texput.log #prstab.tex# last.kumac prstab.ps arxiv.tar.gz prstab.tar.gz referee_response_II.pdf prstab.pdf prstab.aux prstab.dvi prstab.end prstab.log prstab.tex prstab.tex~ accel-010307-f03.eps accel-010307-f28.eps old conclusions.tex higgsfact.tex introduction.tex mice.tex neufact.tex physics.tex prstab.tex r_and_d.tex authors_merged.tex buncher.tex temp.prt last.kumacold ringfig.eps MICE-fig.ps chgr_norm.ps chgr_merit.ps temp.csh temp.prt~ xupdn-a-model-view-iron5.eps site1-Layout1.eps rla2.eps phaserot.eps mole-hill.eps intoap.eps emit.eps cavity.eps allcount.eps MICE-88MHz-cooling.eps changes hh_ha_susy_rtsscan.eps letter_plots.eps scott33.eps scott32b.eps scott32a.eps MICE-200MHz-long.eps MICE-resolution.eps dipole_fields.eps

131

Muon Acceleration R and D  

SciTech Connect

An intense muon source can be built in stages to support a uniquely broad program in high energy physics. Starting with a low-energy cooled muon beam, extraordinarily precise lepton flavor violation experiments are possible. Upgrading the facility with acceleration and a muon storage ring, one can build a Neutrino Factory that would allow a neutrino mixing physics program with unprecedented precision. Adding further acceleration and a collider ring, an energy-frontier muon collider can explore electroweak symmetry breaking and open a window to new physics.

Torun, Yagmur [Illinois Institute of Technology, Chicago (United States)

2009-12-17T23:59:59.000Z

132

US: Muon Spin Resonance (?SR)  

Science Journals Connector (OSTI)

Fig. I.92. US, s.c. ?SR; Zero field muon spectra. Asymmetry, A, vs. ?. (a) Relaxation spectrum at 181 K, i.e. slightly above T ...

R. Tro?

2009-01-01T23:59:59.000Z

133

From Neutrino Factory to Muon Collider  

SciTech Connect

Both Muon Colliders and Neutrino Factories require a muon source capable of producing and capturing {Omicron}(10{sup 21}) muons/year. This paper reviews the similarities and differences between Neutrino Factory and Muon Collider accelerator complexes, the ongoing R&D needed for a Muon Collider that goes beyond Neutrino Factory R&D, and some thoughts about how a Neutrino Factory on the CERN site might eventually be upgraded to a Muon Collider.

Geer, S.; /Fermilab

2010-01-01T23:59:59.000Z

134

Imaging and sensing based on muon tomography  

DOE Patents (OSTI)

Techniques, apparatus and systems for detecting particles such as muons for imaging applications. Subtraction techniques are described to enhance the processing of the muon tomography data.

Morris, Christopher L; Saunders, Alexander; Sossong, Michael James; Schultz, Larry Joe; Green, J. Andrew; Borozdin, Konstantin N; Hengartner, Nicolas W; Smith, Richard A; Colthart, James M; Klugh, David C; Scoggins, Gary E; Vineyard, David C

2012-10-16T23:59:59.000Z

135

Muon Spin Rotation Spectroscopy - Utilizing Muons in Solid State Physics  

SciTech Connect

Over the past decades muon spin rotation techniques (mSR) have established themselves as an invaluable tool to study a variety of static and dynamic phenomena in bulk solid state physics and chemistry. Common to all these approaches is that the muon is utilized as a spin microprobe and/or hydrogen-like probe, implanted in the material under investigation. Recent developments extend the range of application to near surface phenomena, thin film and super-lattice studies. After briefly summarizing the production of so called surface muons used for bulk studies, and discussing the principle differences between pulsed and continuous muon beams, the production of keV-energy muon sources will be discussed. A few topical examples from different active research fields will be presented to demonstrate the power of these techniques.

Suter, Andreas [Paul Scherrer Institut, Switzerland

2012-10-17T23:59:59.000Z

136

Muon catalysis of hot fusion  

Science Journals Connector (OSTI)

... all rates to the nearest order of magnitude). In other words, stripping of the muon is very probable, and it would thus be able to take part in further ... the confinement time is 109s, and the reaction rate 109s-1, on average each muon would catalyse one reaction, hence the occurrence of Rc (the catalytic chain ratio) ...

E. P. HINCKS; M. K. SUNDARESAN; P. J. S. WATSON

1977-10-13T23:59:59.000Z

137

Fundamental Constants of the Muon  

Science Journals Connector (OSTI)

Three precise measurements exist on static properties of the muon. These are the g factor, g-2, and the frequency of the 3D-2P transition in mesonic phosphorus. They are combined to obtain the best fit to the fundamental constants of the muon.

G. Shapiro and L. M. Lederman

1962-02-01T23:59:59.000Z

138

Muon Capture by Deuterons  

Science Journals Connector (OSTI)

Rates of muon capture from the separate ?d hyperfine states are computed. The dependence of the measurement of effective coupling constants on the neutron energy is explicitly demonstrated. The calculation of the neutron energy spectra includes mainly the following refinements: (1) use of two-nucleon wave functions with hard core, (2) corrections for the target-proton momentum, and (3) inclusion of certain induced pseudoscalar terms. The capture rates obtained are 334 and 15 sec-1 for the ?d doublet and quartet states, respectively.

I-T. Wang

1965-09-20T23:59:59.000Z

139

Microcalorimeter-type energy dispersive X-ray spectrometer for a transmission electron microscope  

Science Journals Connector (OSTI)

......Microscopy (1986) New York: Plenum Press. 4...Garratt-Reed A J , Bell D C. Energy-Dispersive X-ray...Microscopy (1996) New York: Plenum Press. 19...Microcalorimeter-type energy dispersive X-ray...electron microscope. | A new energy dispersive......

Toru Hara; Keiichi Tanaka; Keisuke Maehata; Kazuhisa Mitsuda; Noriko Y. Yamasaki; Mitsuaki Ohsaki; Katsuaki Watanabe; Xiuzhen Yu; Takuji Ito; Yoshihiro Yamanaka

2010-02-01T23:59:59.000Z

140

Calibrating the energy of a 50 X 50 GeV muon collider using spin precession  

E-Print Network (OSTI)

The neutral Higgs boson is expected to have a mass in the region 90-150 GeV in various schemes within the Minimal Supersymmetric extension to the Standard Model. A first generation Muon Collider is uniquely suited to investigate the mass, width and decay modes of the Higgs boson, since the coupling of the Higgs to muons is expected to be strong enough for it to be produced in the s channel mode in the muon collider. Due to the narrow width of the Higgs, it is necessary to measure and control the energy of the individual muon bunches to a precision of a few parts in a million. We investigate the feasibility of determining the energy scale of a muon collider ring with circulating muon beams of 50 GeV energy by measuring the turn by turn variation of the energy deposited by electrons produced by the decay of the muons. This variation is caused by the existence of an average initial polarization of the muon beam and a non-zero value of g-2 for the muon. We demonstrate that it is feasible to determine the energy scale of the machine with this method to a few parts per million using data collected during 1000 turns.

Rajendran Raja; Alvin Tollestrup

1998-01-06T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

The Contribution of e+e- Pair to the QED Two-Loop Vertex Correction for the Muon Vertex at High Energy  

Science Journals Connector (OSTI)

......Vertex Correction for the Muon Vertex at High Energy Masataka Igarashi Department...correction is obtained for the muon vertex of the Dirac type at the time-like high energy. Also obtained is the...e + e - pair from the muon vertex. The leading mass-singularities......

Masataka Igarashi

1987-07-01T23:59:59.000Z

142

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams  

E-Print Network (OSTI)

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams: Neutrino Factories and Muon Colliders p Source, 8­24 GeV, 1­4MW A Neutrino Factory based on a Muon Storage Linac 2 ­ 50 GeV Recirculating Linac 50­GeV Muon Storage Ring ~ 1km circumference Neutrino Beam to Near

McDonald, Kirk

143

OPTIMIZING MUON CAPTURE AND TRANSPORT FOR A NEUTRINO FACTORY/MUON COLLIDER FRONT END  

E-Print Network (OSTI)

OPTIMIZING MUON CAPTURE AND TRANSPORT FOR A NEUTRINO FACTORY/MUON COLLIDER FRONT END Hisham K In the current baseline scheme of the Neutrino Fac- tory/Muon Collider a muon beam from pion decay is pro- duced of the field along the beam, were varied to maximize the number of muons delivered to the Cooling Channel

McDonald, Kirk

144

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams  

E-Print Network (OSTI)

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams: Neutrino Factories and Muon Colliders p Source, 8-24 GeV, 1-4MW A Neutrino Factory based on a Muon StorageV Recirculating Linac 50-GeV Muon Storage Ring ~ 1km circumference Neutrino Beam to Near Detector Neutrino Beam

McDonald, Kirk

145

Muon B Flavor Tagging A Likelihood Approach  

E-Print Network (OSTI)

Muon B Flavor Tagging A Likelihood Approach Text for the blessed web page { CDF note 7043 The CDF Collaboration July 29, 2004 Abstract We describe a muon identi#12;cation algorithm to be used for opposite side in a likelihood function which estimates the probability that a muon object is a real muon. The tagger performance

Fermilab

146

Research and Development of Future Muon Collider  

SciTech Connect

Muon collider is a considerable candidate of the next generation high-energy lepton collider machine. A novel accelerator technology must be developed to overcome several intrinsic issues of muon acceleration. Recent research and development of critical beam elements for a muon accelerator, especially muon beam phase space ionization cooling channel, are reviewed in this paper.

Yonehara, K.; /Fermilab

2012-05-01T23:59:59.000Z

147

BNL -66968 CAP-265-Muon-99C  

E-Print Network (OSTI)

BNL - 66968 CAP-265-Muon-99C The Design of a Liquid Lithium Lens for a Muon Collider A. Hassanein, 1999, Vol. 5, pp. 3062-3064. #12;I #12;THE DESIGN OF A LIQUID LITHIUM LENS FOR A MUON COLLIDER* A stage of ionization cooling for the muon collider requires a multistage liquid lithium lens. This system

Harilal, S. S.

148

Muon reconstruction with AMANDA Christopher Wiebusch  

E-Print Network (OSTI)

Muon reconstruction with AMANDA Christopher Wiebusch DESY IfH Platanenallee 6, 15738 Zeuthen, Germany Abstract This document describes the method of muon track reconstruction in AMANDA. #12; 1 particles such as muons. Clearly identified up­going muon tracks are a key signature for charged current

Wiebusch, Christopher

149

Muon-induced backgrounds in the CUORICINO experiment  

E-Print Network (OSTI)

Muon-induced backgrounds in the CUORICINO experiment E.the contribution of cosmic ray muons to the CUORICINOKey words: CUORICINO, muons, cosmic rays, double beta decay,

Andreotti, E.

2010-01-01T23:59:59.000Z

150

Radiative Muon Capture in Calcium  

Science Journals Connector (OSTI)

The branching ratio relative to ordinary muon capture and the photon asymmetry relative to the muon-spin direction were measured for radiative muon capture in Ca40. For ~ 1200 photon events, the partial branching ratio is Rk>57 MeV=(21.1±1.4)×10-6, and the asymmetry for k>63.5 MeV is +0.90±0.50. A fit of the photon spectrum to the theory of Rood, Yano, and Yano gives the value gP?=(6.5±1.6)gA for the pseudoscalar-coupling constant. These results are in disagreement with earlier experiments.

R. D. Hart; C. R. Cox; G. W. Dodson; M. Eckhause; J. R. Kane; M. S. Pandey; A. M. Rushton; R. T. Siegel; R. E. Welsh

1977-08-15T23:59:59.000Z

151

Muon motion irradiated by a femtosecond laser pulse in muon-catalyzed fusion  

Science Journals Connector (OSTI)

Introducing a superintense femtosecond laser pulse in the muon-catalyzed fusion (?CF) target, taking ... equations, the paper studies the movement of muon in the plasma. Muon drift along the direction of laser pr...

Tong-cheng Wu ???; Chun-hua Shi ???…

2008-10-01T23:59:59.000Z

152

Muon-spin-rotation study of muon polarization losses in plastic scintillators and quartz  

Science Journals Connector (OSTI)

Muon polarization losses in plastic scintillators of two ... been studied by the ?SR method. The muon and muonium spin precession spectra have been ... SR setup placed at the output of the muon channel of the Gat...

S. I. Vorob’ev; A. L. Getalov; E. N. Komarov; S. A. Kotov; I. I. Pavlova…

2013-08-01T23:59:59.000Z

153

Direct production of muon pairs by high-energy muons  

Science Journals Connector (OSTI)

For ultrarelativistic muons, the cross section for the process ?+Z??+Z+?++?? is calculated with allowance for the nuclear and atomic form factors. It is shown that the nuclear form factor affects significantly th...

S. R. Kel’ner; R. P. Kokoulin; A. A. Petrukhin

2000-09-01T23:59:59.000Z

154

Muon Physics Possibilities at a Muon-Neutrino Factory  

Science Journals Connector (OSTI)

New intense proton accelerators with above GeV energies and MW beam power, such as they are discussed in connection with neutrino factories, appear to be excellently suited for feeding bright muon sources for low...

Klaus P. Jungmann

155

A Cosmic Ray Measurement Facility for ATLAS Muon Chambers  

E-Print Network (OSTI)

Monitored Drift Tube (MDT) chambers will constitute the large majority of precision detectors in the Muon Spectrometer of the ATLAS experiment at the Large Hadron Collider at CERN. For commissioning and calibration of MDT chambers, a Cosmic Ray Measurement Facility is in operation at Munich University. The objectives of this facility are to test the chambers and on-chamber electronics, to map the positions of the anode wires within the chambers with the precision needed for standalone muon momentum measurement in ATLAS, and to gain experience in the operation of the chambers and on-line calibration procedures. Until the start of muon chamber installation in ATLAS, 88 chambers built at the Max Planck Institute for Physics in Munich have to be commissioned and calibrated. With a data taking period of one day individual wire positions can be measured with an accuracy of 8.3 micrometers in the chamber plane and 27 micrometers in the direction perpendicular to that plane.

O. Biebel; M. Binder; M. Boutemeur; A. Brandt; J. Dubbert; G. Duckeck; J. Elmsheuser; F. Fiedler; R. Hertenberger; O. Kortner; T. Nunnemann; F. Rauscher; D. Schaile; P. Schieferdecker; A. Staude; W. Stiller; R. Stroehmer; R. Vertesi

2003-07-30T23:59:59.000Z

156

Fermilab | Science | Particle Physics | Muons  

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

force at the time of the big bang? How did the universe change from being dominated by energy and radiation to the one we see today, made of both visible and dark matter? Muons...

157

Thermal creation of electron spin polarization in n-type silicon  

SciTech Connect

Conversion of heat into a spin-current in electron doped silicon can offer a promising path for spin-caloritronics. Here, we create an electron spin polarization in the conduction band of n-type silicon by producing a temperature gradient across a ferromagnetic tunnel contact. The substrate heating experiments induce a large spin signal of 95??V, corresponding to 0.54?meV spin-splitting in the conduction band of n-type silicon by Seebeck spin tunneling mechanism. The thermal origin of the spin injection has been confirmed by the quadratic scaling of the spin signal with the Joule heating current and linear dependence with the heating power.

Dankert, André, E-mail: andre.dankert@chalmers.se; Dash, Saroj P., E-mail: saroj.dash@chalmers.se [Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg (Sweden)

2013-12-09T23:59:59.000Z

158

Thermal Creation of Electron Spin Polarization in n-Type Silicon  

E-Print Network (OSTI)

Conversion of heat into a spin-current in electron doped silicon can offer a promising path for spin-caloritronics. Here we create an electron spin polarization in the conduction band of n-type silicon by producing a temperature gradient across a ferromagnetic tunnel contact. The substrate heating experiments induce a large spin signal of 95 $\\mu$V, corresponding to 0.54 meV spin-splitting in the conduction band of n-type silicon by Seebeck spin tunneling mechanism. The thermal origin of the spin injection has been confirmed by the quadratic scaling of the spin signal with the Joule heating current and linear dependence with the heating power.

André Dankert; Saroj P. Dash

2014-03-14T23:59:59.000Z

159

Compact muon production and collection scheme for high-energy physics experiments  

Science Journals Connector (OSTI)

The relative immunity of muons to synchrotron radiation suggests that they might be used in place of electrons as probes in fundamental high-energy physics experiments. Muons are commonly produced indirectly through pion decay by interaction of a charged particle beam with a target. However, the large angle and energy dispersion of the initial beams as well as the short muon lifetime limits many potential applications. Here, we describe a fast method for manipulating the longitudinal and transverse phase-space of a divergent pion–muon beam to enable efficient capture and downstream transport with minimum losses. We also discuss the design of a handling system for the removal of unwanted secondary particles from the target region and thus reduce activation of the machine. The compact muon source we describe can be used for fundamental physics research in neutrino experiments.

Diktys Stratakis; David V Neuffer

2014-01-01T23:59:59.000Z

160

The US muon accelerator program  

E-Print Network (OSTI)

A directed R&D program is presently underway in the U.S. to evaluate the designs and technologies required to provide muon-based high energy physics (HEP) accelerator capabilities. Such capabilities have the potential to provide unique physics reach for the HEP community. An overview of the status of the designs for the neutrino factory and muon collider applications is provided. Recent progress in the technology R&D program is summarized.

Palmer, M A

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Radiative muon absorption in oxygen  

Science Journals Connector (OSTI)

The photon spectrum from radiative absorption of negative muons in O16 has been measured with a high-resolution pair spectrometer. The integrated branching ratio for photons with energies greater than 57 MeV relative to the total muon absorption rate is (3.8±0.4)×10-5. The data are consistent with nuclear model calculations for a value of the induced pseudoscalar coupling in O16 of gP/gA=13.5±1.5.

A. Frischknecht; M. Döbeli; W. Stehling; G. Strassner; P. Truöl; J. C. Alder; C. Joseph; J. F. Loude; J. P. Perroud; D. Ruegger; M. T. Tran; H. Panke

1988-11-01T23:59:59.000Z

162

Muon Colliders: The Next Frontier  

SciTech Connect

Muon Colliders provide a path to the energy frontier in particle physics but have been regarded to be "at least 20 years away" for 20 years. I will review recent progress in design studies and hardware R&D and show that a Muon Collider can be established as a real option for the post-LHC era if the current vigorous R&D effort revitalized by the Muon Collider Task Force at Fermilab can be supported to its conclusion. All critical technologies are being addressed and no show-stoppers have emerged. Detector backgrounds have been studied in detail and appear to be manageable and the physics can be done with existing detector technology. A muon facility can be built through a staged scenario starting from a low-energy muon source with unprecedented intensity for exquisite reach for rare processes, followed by a Neutrino Factory with ultrapure neutrino beams with unparalleled sensitivity for disentangling neutrino mixing, leading to an energy frontier Muon Collider with excellent energy resolution.

Yagmur Tourun

2009-07-29T23:59:59.000Z

163

Muon Colliders: The Next Frontier  

ScienceCinema (OSTI)

Muon Colliders provide a path to the energy frontier in particle physics but have been regarded to be "at least 20 years away" for 20 years. I will review recent progress in design studies and hardware R&D and show that a Muon Collider can be established as a real option for the post-LHC era if the current vigorous R&D effort revitalized by the Muon Collider Task Force at Fermilab can be supported to its conclusion. All critical technologies are being addressed and no show-stoppers have emerged. Detector backgrounds have been studied in detail and appear to be manageable and the physics can be done with existing detector technology. A muon facility can be built through a staged scenario starting from a low-energy muon source with unprecedented intensity for exquisite reach for rare processes, followed by a Neutrino Factory with ultrapure neutrino beams with unparalleled sensitivity for disentangling neutrino mixing, leading to an energy frontier Muon Collider with excellent energy resolution.

Yagmur Tourun

2010-01-08T23:59:59.000Z

164

Measurement of the polarization of positive muons produced in high-energy antineutrino interactions  

Science Journals Connector (OSTI)

The question whether scalar-type interactions contribute to weak interactions at large momentum transfer has been investigated by a measurement of the longitudinal polarization of positive muons produced in charg...

M. Jonker; F. Udo; J. V. Allaby; U. Amaldi…

1983-01-01T23:59:59.000Z

165

Muon transfer induced by collisional excitation of helium muonide He?+ after muon catalyzed fusionafter muon catalyzed fusion  

Science Journals Connector (OSTI)

Possibility of negative muon transfer from helium muonide He?+...to T /or D/ through collisional excitation after muon catalyzed fusion has been pointed out. The...+...in the medium of tritium or deuterium. It is...

K. Yoshihara; T. Sekine

1988-09-01T23:59:59.000Z

166

Muon Collaboration Friday Meetings  

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

Collaboration Friday Meetings Collaboration Friday Meetings Muon Collaboration Friday Meetings are held at Fermilab, in the Snakepit (WH 2E), at 1:30 pm CDT/CST on most Fridays. An audio bridge is available, details are in the meeting notice. To receive the weekly meeting notice, either join the NuMu-Collaboration-l mailing list or send email to Terry Hart (look me up in the FNAL Phonebook). 13-NOV-2009 Agenda Zisman.pdf 30-OCT-2009 Agenda Bross.ppt Ankenbrandt.ppt 22-OCT-2009 Agenda Fernow_1.pdf Fernow_2.pdf Snopok.pdf Palmer.pdf 16-OCT-2009 Agenda News Alexahin.ppt Alexakhin.pdf 9-OCT-2009 Agenda Yonehara.ppt 8-OCT-2009 Agenda Kirk.pdf 1-OCT-2009 Agenda Lamm.pdf 25-SEP-2009 Agenda Fernow.pdf 24-SEP-2009 Agenda 18-SEP-2009 Derun.pptx 17-SEP-2009 popovic.ppt 10-SEP-2009 Action_items.doc Bross.ppt Agenda 4-SEP-2009 Kaplan.pdf

167

A Diffusion Cloud Chamber Study of Very Slow Mesons. II. Beta Decay of the Muon  

DOE R&D Accomplishments (OSTI)

The spectrum of electrons arising from the decay of the negative mu meson has been determined. The muons are arrested in the gas of a high pressure hydrogen filled diffusion cloud chamber. The momenta of the decay electrons are determined from their curvature in a magnetic field of 7750 gauss. The spectrum of 415 electrons has been analyzed according to the theory of Michel.

Lederman, L. M.; Sargent, C. P.; Rinehart, M.; Rogers, K.

1955-03-00T23:59:59.000Z

168

Variation of Langmuir wave polarization with electron beam speed in type III radio bursts  

SciTech Connect

Observations by the twin STEREO spacecraft of in-situ electric field waveforms and radio signatures associated with type III radio bursts have demonstrated that the polarization of electron beam-driven waves near the local plasma frequency depends strongly on the speed of the driving electron beam. We expand upon a previous study by including all radio bursts with in-situ waveforms observed by STEREO in 2011. The expanded data set contains five times more radio bursts (35 up from 7) and three times as many Langmuir waves (663 up from 168). While this expanded study supports the results of the original study, that faster (slower) beam electrons drive waves with strong (weak) electric fields perpendicular to the local magnetic field, the larger data set emphasizes that the observation of strong perpendicular electric fields at high electron beam speeds is probabilistic rather than definite. This property supports the interpretation of wave polarization dependence on beam speed as Langmuir/z-mode waves shifted to small wave number through interaction with turbulent solar wind density fluctuations.

Malaspina, David M. [Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303 (United States); Cairns, Iver H. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Ergun, Robert E. [Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303 (United States) and Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80303 (United States)

2013-06-13T23:59:59.000Z

169

Electronic and optical properties of single excitons and biexcitons in type-II quantum dot nanocrystals  

SciTech Connect

In this study, a detailed investigation of the electronic and optical properties (i.e., binding energies, absorption wavelength, overlap of the electron-hole wave functions, recombination oscillator strength, etc.) of an exciton and a biexciton in CdTe/CdSe core/shell type-II quantum dot heterostructures has been carried out in the frame of the single band effective mass approximation. In order to determine the electronic properties, we have self-consistently solved the Poisson-Schrödinger equations in the Hartree approximation. We have considered all probable Coulomb interaction effects on both energy levels and also on the corresponding wave functions for both single exciton and biexciton. In addition, we have taken into account the quantum mechanical exchange-correlation effects in the local density approximation between same kinds of particles for biexciton. Also, we have examined the effect of the ligands and dielectric mismatch on the electronic and optical properties. We have used a different approximation proposed by Sahin and Koc [Appl. Phys. Lett. 102, 183103 (2013)] for the recombination oscillator strength of the biexciton for bound and unbound cases. The results obtained have been presented comparatively as a function of the shell thicknesses and probable physical reasons in behind of the results have been discussed in a detail.

Koc, Fatih, E-mail: fatih.koc@msn.com [Department of Physics, Faculty of Sciences, Selcuk University, 42075 Konya (Turkey); Sahin, Mehmet, E-mail: mehmet.sahin@agu.edu.tr, E-mail: mehsahin@gmail.com [Department of Physics, Faculty of Sciences, Selcuk University, 42075 Konya (Turkey); Department of Material Science and Nanotechnology Engineering, Abdullah Gül University, Kayseri (Turkey)

2014-05-21T23:59:59.000Z

170

The Program in Muon and Neutrino Physics: Super Beams, Cold Muon Beams,  

E-Print Network (OSTI)

The Program in Muon and Neutrino Physics: Super Beams, Cold Muon Beams, Neutrino Factory and the Muon Collider Editor: Rajendran Raja1 1 Fermi National Accelerator Laboratory, Batavia, IL 60510, USA Members of the Executive Board of the Muon Collaboration D. Cline,2 J. Gallardo,3 S. Geer,1 D. Kaplan,4 K

171

Directional muon jet chamber for a muon collider (Groovy Chamber)  

SciTech Connect

A directional jet drift chamber with PAD readout is proposed here which can select vertex originated muons within a given time window and eliminate those muons which primarily originate upstream, using only a PAD readout. Drift time provides the Z-coordinate, and the center of gravity of charge distribution provides the r-{psi} coordinates. Directionality at the trigger level is obtained by the timing measurement from the PAD hits within a given time window. Because of the long drift time between the bunch crossings, a muon collider enables one to choose a drift distance in the drift chamber as long as 50 cm. This is an important factor in reducing cost of drift chambers which have to cover relatively large areas.

Atac, M. [Fermi National Accelerator Lab., Batavia, IL (United States)]|[Univ. of California, Los Angeles, CA (United States)

1996-10-01T23:59:59.000Z

172

Experiments with low-energy muons  

Science Journals Connector (OSTI)

Two experiments with low-energy muons are described: the determination of the stopping ... of C, Si, Ti and Au for muons at energies down to 2 keV and the measurement ... . A pronounced Barkas effect was found fo...

F. J. Hartmann; H. Daniel; Chr Maierl; M. Mühlbauer; W. Schott…

1996-01-01T23:59:59.000Z

173

Muon catalysed fusion for pellet ignition  

Science Journals Connector (OSTI)

... and ordinary fusion reaction rates. Simultaneously, or a short time beforehand, a pulse of muons (probably > 1010 in 1010 in muon energy distribution is selected such that most of the ...

W.P.S. Tan

1976-10-21T23:59:59.000Z

174

Diamagnetic muon yields of metal acetylacetonates  

Science Journals Connector (OSTI)

Diamagnetic muon yields /PD.../ in various metal acetylacetonates were measured at room temperature by the muon spin rotation technique. We have found a...D between complexes of typical elements and those of tran...

M. K. Kubo; Y. Sakai; T. Tominaga…

1989-05-02T23:59:59.000Z

175

Muon Knight Shift Studies in Metals  

Science Journals Connector (OSTI)

The Knight shift K? of the positive muon implanted as a proton substitute in various ... has been measured by means of a stroboscopic muon spin rotation method 1). The stroboscopic ... + SR technique bases on a p...

F. N. Gygax; A. Hintermann; W. Rüegg…

1980-01-01T23:59:59.000Z

176

Muon motion in titanium hydride  

Science Journals Connector (OSTI)

Motional narrowing of the transverse-field muon-spin rotation signal has been reported previously for ?-TiHx with x=1.83, 1.97, and 1.99. An analysis of the results for TiH1.99 near room temperature indicates that the mechanism responsible for the motion of the muon out of the octahedral site is thermally activated diffusion with an attempt frequency comparable to the optical vibrations of the lattice. The motional narrowing in TiH1.97 near 500 K is interpreted with the aid of Monte Carlo calculations which simulated the effect of muon and proton motion upon the field-correlation time for the muon. The results of these simulations coupled with published proton nuclear-magnetic-resonance T1 measurements indicate that the field-correlation time for the muon can be explained if the rate of motion for the nearest-neighbor protons is decreased relative to the hopping rate for the unperturbed lattice.

J. R. Kempton; K. G. Petzinger; W. J. Kossler; H. E. Schone; C. E. Stronach

1989-07-01T23:59:59.000Z

177

Muon-Pair Production by Atmospheric Muons in CosmoALEPH  

Science Journals Connector (OSTI)

Data from a dedicated cosmic ray run of the ALEPH detector were used in a study of muon trident production, i.e., muon pairs produced by muons. Here the overburden and the calorimeters are the target materials while the ALEPH time projection chamber provides the momentum measurements. A theoretical estimate of the muon trident cross section is obtained by developing a Monte Carlo simulation for muon propagation in the overburden and the detector. Two muon trident candidates were found to match the expected theoretical pattern. The observed production rate implies that the nuclear form factor cannot be neglected for muon tridents.

F. Maciuc; C. Grupen; N.-O. Hashim; S. Luitz; A. Mailov; A.-S. Müller; A. Putzer; H.-G. Sander; S. Schmeling; M. Schmelling; R. Tcaciuc; H. Wachsmuth; Th. Ziegler; K. Zuber

2006-01-19T23:59:59.000Z

178

Muon Yield Comparisons for Different ICOOL  

E-Print Network (OSTI)

1 Muon Yield Comparisons for Different ICOOL Versions and Lattices X. Ding Front End, Nov. 23, 2010 parameters of 11 and 13GeV from interpolation) � Take the muon/pion/kaons at z=0 m from MARS output (Field of Running MARS #12;4 Muon Yield from Different Versions of ICOOL with ST2a-BNL Input Deck #12;5 Muon Yield

McDonald, Kirk

179

Muon Spin Relaxation Studies of Lithium Nitridometallate Battery Materials: Muon Trapping and Lithium Ion Diffusion  

Science Journals Connector (OSTI)

Muon Spin Relaxation Studies of Lithium Nitridometallate Battery Materials: Muon Trapping and Lithium Ion Diffusion ... The muons themselves are quasi-static, most probably located in a 4h site between the [Li2N] plane and the Li(1)/Ni layer. ... The initial fall in ? results from an increase in muon hopping as the temperature is raised, while the subsequent rise originates from an increasing proportion of trapped and therefore static muons. ...

Andrew S. Powell; James S. Lord; Duncan H. Gregory; Jeremy J. Titman

2009-10-27T23:59:59.000Z

180

Energy spectrum of cosmic-ray muons  

Science Journals Connector (OSTI)

The energy spectrum of cosmic-ray muons at sea-level is calculated by the ... in good agreement with the observed data of muons with the zenith angles of 0° and ... the scaling model is valid up to the muon energy

H. Komori; K. Mitsui

Note: This page contains sample records for the topic "types electron muon" from the National Library of EnergyBeta (NLEBeta).
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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

Muon Cooling via Ionization Andrea Kay Forget  

E-Print Network (OSTI)

1 Muon Cooling via Ionization Andrea Kay Forget Department of Physics, Wayne State University, Detroit, Michigan 48202 Dated: August 7, 2006 Muons only live a few microseconds before they ultimately, and laser cooling) cannot be used to properly cool muons that are being used in proposed accelerators

Cinabro, David

182

Muon Studies in Organic Conductors [and Discussion  

Science Journals Connector (OSTI)

15 February 1995 research-article Muon Studies in Organic Conductors [and Discussion...Stoneham This paper contains a brief review of muon studies of organic conductors with emphasis...polymers. The species created by implanted muons in both semiconducting polymers and polymers...

1995-01-01T23:59:59.000Z

183

Intense Muon Physics Working Group Summary  

E-Print Network (OSTI)

The intense muon beams which will be available at a neutrino factory provide a unique opportunity for searching for physics beyond the standard model, both in lepton flavor violation and in the search for a permanent electric dipole moment for the muon. Other experiments which can use intense muon beams will also be possible.

B. Lee Roberts; Marco Grassi; Akira Sato

2005-10-20T23:59:59.000Z

184

A muon trigger upgrade with high transverse momentum resolution for the ATLAS detector at the High-Luminosity LHC  

E-Print Network (OSTI)

The Level-1 trigger for muons of the ATLAS experiment is based on trigger chambers with excellent time resolution which identifies muons coming from a particular beam crossing. To cope with a stringent constraint on the trigger rates expected at the phase II of the LHC, the socalled High-Luminosity LHC, it is proposed to include precision tracking chambers in the Level-1 muon trigger for improving the transverse momentum resolution. The rate of a single muon trigger with a transverse momentum threshold of 20 GeV is estimated to reduce to about half in an entire pseudorapidity region by introducing the proposed upgrade. An architecture of the electronics includes an additional priority readout chain, which is independent of the standard and asynchronous readout. A demonstrator of the frontend electronics has been developed and an initial test based on cosmic muons shows a resolution of position measurements consistent with a simulation.

Horii, Yasuyuki; The ATLAS collaboration

2014-01-01T23:59:59.000Z

185

Muon Capture in Heavy Nuclei  

Science Journals Connector (OSTI)

The systematics of muon capture rates in complex nuclei is discussed in the closure approximation. It is shown that for calculations in infinite nuclear matter, the nuclear ground state can be reasonably approximated by an infinite Fermi gas. The closure approximation and Fermi-gas model for the nuclear ground state are then used in an analysis of the experimental capture rates in a large number of nuclei. We find that this procedure does allow one to satisfactorily interpret quantitatively the muon-capture rates in the heavier nuclei and that it is possible to interpret the analysis in a manner which is not inconsistent with a universal Fermi interaction. The possibility of using muon capture rates to determine a neutron-proton nuclear-radius difference is also explored but with negative results.

R. Klein

1966-06-17T23:59:59.000Z

186

Annealing of electron-induced defects in n-type germanium  

Science Journals Connector (OSTI)

n-type, 1013 and 2 × 1015 cm-3 doped germanium has been irradiated with ? 1-MeV electrons at liquid-helium and room temperatures. With the use of transient-capacitance spectroscopy, six electron traps and one hole trap were observed following irradiation at 4 K. Their energy levels have been determined to be at Ec-40, 120, 120, 260, 390, and 530 meV, and at Ev+250 meV. The isochronal annealing behavior of these traps, in addition to that of the four electron traps and of the four hole traps produced by room-temperature irradiation, has been studied in detail. Comparison of our results with previously published ones indicates that (i) the divacancy anneals around 150°C and the E center around 100°C, (ii) the two levels at Ec-120 meV are associated with the germanium interstitial or complexes involving a germanium interstitial, and (iii) there appears to be a vacancy level in the range 100-200 meV from the conduction band, which anneals at ? 100 K.

P. M. Mooney; F. Poulin; J. C. Bourgoin

1983-09-15T23:59:59.000Z

187

Lateral distribution of muon pairs in deep underground muon showers  

Science Journals Connector (OSTI)

The lateral distribution of muon showers deep underground in the Utah muon detector has been studied. The results are presented in the form of a decoherence curve, which is defined to be the rate of pairs of coincident muons in two small detectors (as a function of their separation) divided by the product of the areas of the detectors. Rates are measured for separations from 1 to greater than 60 m for depths ranging from 2.4 × 105 gcm-2 to 5.6 × 105 gcm-2 and zenith angles ranging from 42.5 to 62.5 degrees. Significant improvements on previously reported data have been made due to increased detector-memory size, improved triggering efficiency, longer running time and better statistical analysis. When the decoherence curve is parameterized by the function R(x)=R0e-xx0 the value of the mean separation x0 at 47.5°, 2.4 × 105 gcm-2 is 11.21 ± 0.38 m. In a modified scaling model this separation suggests an average transverse momentum of roughly 0.65 GeV/c for muons from hadron-air collisions with energy > 10 TeV.

G. H. Lowe; H. E. Bergeson; J. W. Keuffel; M. O. Larson; J. L. Morrison; W. J. West

1976-06-01T23:59:59.000Z

188

Muon Identification in the LHCb experiment  

E-Print Network (OSTI)

A short summary of the LHCb muon identification procedure is given in this article. First, the muon system of LHCb is presented, together with some examples of physics measurements of the experiment where the muon identification is crucial. Then, the muon identification algorithm is introduced in three single steps. With this, the efficiency vs. misidentification rate is shown for MC simulated data. The way this method will be calibrated with real data is also seen. Finally, some preliminary muon identification results with proton-proton collisions at sqrt(s) = 900 GeV are presented.

X. Cid Vidal

2010-05-14T23:59:59.000Z

189

The Muon LINAC for the International Design Study of the Neutrino Factory  

SciTech Connect

The first stage of muon acceleration in the Neutrino Factory utilises a superconducting linac to accelerate muons from 244 MeV to 900 MeV. The linac was split into three types of cryomodules with decreasing magnetic fields and increasing amounts of RF voltage but with the design of the superconducting solenoid and RF cavities being the same for all cryomodules. The current status of the muon linac for the International Design Study for the Neutrino Factory will be presented including a final lattice design of the linac and tracking simulations.

A. Kurup, C. Bontoiu, Morteza Aslaninejad, J. Pozimski, A. Bogacz, V.S. Morozov, Y.R. Roblin, K.B. Beard

2011-09-01T23:59:59.000Z

190

Muon Fluxes From Dark Matter Annihilation  

E-Print Network (OSTI)

We calculate the muon flux from annihilation of the dark matter in the core of the Sun, in the core of the Earth and from cosmic diffuse neutrinos produced in dark matter annihilation in the halos. We consider model-independent direct neutrino production and secondary neutrino production from the decay of taus produced in the annihilation of dark matter. We illustrate how muon energy distribution from dark matter annihilation has a very different shape than muon flux from atmospheric neutrinos. We consider both the upward muon flux, when muons are created in the rock below the detector, and the contained flux when muons are created in the (ice) detector. We contrast our results to the ones previously obtained in the literature, illustrating the importance of properly treating muon propagation and energy loss. We comment on neutrino flavor dependence and their detection.

Arif Emre Erkoca; Mary Hall Reno; Ina Sarcevic

2009-06-23T23:59:59.000Z

191

Young-Type Experiment Using a Single-Electron Source and an Independent Atomic-Size Two-Center Interferometer  

Science Journals Connector (OSTI)

Evidence is given for Young-type interferences caused by a single electron acting on a given double-center scatterer analogous to an atomic-size double-slit system. The electron is provided by autoionization of a doubly excited He atom following the capture of the electrons of H2 by a He2+ incoming ion. The autoionizing projectile is a single-electron source, independent of the interferometer provided by the two H+ centers of the fully ionized H2 molecule. This experiment resembles the famous thought experiment imagined by Feynman in 1963, in which the quantum nature of the electron is illustrated from a Young-like double-slit experiment. Well-defined oscillations are visible in the angular distribution of the scattered electrons, showing that each electron interferes with itself.

J.-Y. Chesnel; A. Hajaji; R. O. Barrachina; F. Frémont

2007-03-08T23:59:59.000Z

192

A Comparative Study of RF and Induction Linac Approaches to Phase Rotation of a Muon Bunch in the Production Region of a muon + - muon- Collider  

E-Print Network (OSTI)

until pion decay is Fig.l: Muon energy versus arrival time.we therefore chose a pion/muon kinetic energy interval 50 toAs the pions/muons in this energy interval propagate a

Turner, W.C.

2011-01-01T23:59:59.000Z

193

A Comparative Study of RF and Induction Linac Approaches to Phase Rotation of a Muon Bunch in the Production Region of a muon + - muon- Collider  

E-Print Network (OSTI)

Approach to Phase Rotation of a Muon Bunch in the Productionto Phase Rotation of a Muon Bunch in the Production Regionthe selection of input muons. Some work has been done on the

Turner, W.C.

2011-01-01T23:59:59.000Z

194

Magnetic Moment of the Free Muon  

Science Journals Connector (OSTI)

The magnetic moment of the positive ? meson has been measured in several target materials by a magnetic resonance technique. Muons were brought to rest with their spins parallel to a magnetic field. A radio-frequency pulse was applied to effect a spin reorientation which was detected by counting the decay electrons emerging after the pulse in a fixed direction. Results are expressed in terms of a g factor which for a spin 1/2 particle is the ratio of the actual moment to e?2m?c. The most accurate result obtained in a CHBr3 target, is that g=2(1.0026±0.0009) compared to the theoretical prediction of g=2(1.0012). Less accurate measurements yielded g=2.005±0.005 in a copper target and g=2.00±0.01 in a lead target.

T. Coffin; R. L. Garwin; S. Penman; L. M. Lederman; A. M. Sachs

1958-02-01T23:59:59.000Z

195

Simulation of large acceptance LINAC for muons  

SciTech Connect

There has been a recent need for muon accelerators not only for future Neutrino Factories and Muon Colliders but also for other applications in industry and medical use. We carried out simulations on a large-acceptance muon linac with a new concept 'mixed buncher/acceleration'. The linac can accept pions/muons from a production target with large acceptance and accelerate muon without any beam cooling which makes the initial section of muon-linac system very compact. The linac has a high impact on Neutrino Factory and Muon Collider (NF/MC) scenario since the 300-m injector section can be replaced by the muon linac of only 10-m length. The current design of the linac consists of the following components: independent 805-MHz cavity structure with 6- or 8-cm-radius aperture window; injection of a broad range of pion/muon energies, 10-100 MeV, and acceleration to 150 - 200 MeV. Further acceleration of the muon beam are relatively easy since the beam is already bunched.

Miyadera, H [Los Alamos National Laboratory; Kurennoy, S [Los Alamos National Laboratory; Jason, A J [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

196

Muon spin resonance by strong pulsed r.f. field with pulsed muons  

Science Journals Connector (OSTI)

Muon spin resonance experiments have been performed for...+ in H2O and for some other cases, and the first observation has been made of the time-differential pattern of muon spin resonance, namely, spin precessio...

Y. Kitaoka; M. Takigawa; H. Yasuoka; M. Itoh; S. Takagi; Y. Kuno…

1982-05-01T23:59:59.000Z

197

Muon capture in Ar. The muon lifetime and yields of Cl isotopes  

Science Journals Connector (OSTI)

The time and energy spectra of ? rays, accompanying negative muon capture in a 40Ar target, have been measured using Ge detectors. The results of measuring the muon lifetime in 40Ar and yields of different Cl and...

A. V. Klinskikh; S. Brianson; V. B. Brudanin…

2008-06-01T23:59:59.000Z

198

Muon bonding versus muonium formation: Muon-Spin-Relaxation in ?-Al2O3  

Science Journals Connector (OSTI)

Results of Muon-Spin-Relaxation (?SR) experiments on well...2O3...) are reported. Major issue in this study is the controversy of muon bonding or muonium formation in insulators. Transverse ... applied field. The...

C. Boekema; K. C. Chan; R. L. Lichti; A. B. Denison; D. W. Cooke…

1986-12-01T23:59:59.000Z

199

Muon Catalyzed Fusion and Basic Muon Reactions in Deuterium and Hydrogen  

Science Journals Connector (OSTI)

By now, the kinetics of muon catalyzed fusion in pure D 2...and in H-D mixtures is understood in terms of the basic underlying processes. It provides rich information about muon induced few-body r...

Peter Kammel

1993-01-01T23:59:59.000Z

200

Precision Muon Reconstruction in Double Chooz  

E-Print Network (OSTI)

We describe a muon track reconstruction algorithm for the reactor anti-neutrino experiment Double Chooz. The Double Chooz detector consists of two optically isolated volumes of liquid scintillator viewed by PMTs, and an Outer Veto above these made of crossed scintillator strips. Muons are reconstructed by their Outer Veto hit positions along with timing information from the other two detector volumes. All muons are fit under the hypothesis that they are through-going and ultrarelativistic. If the energy depositions suggest that the muon may have stopped, the reconstruction fits also for this hypothesis and chooses between the two via the relative goodness-of-fit. In the ideal case of a through-going muon intersecting the center of the detector, the resolution is ~40 mm in each transverse dimension. High quality muon reconstruction is an important tool for reducing the impact of the cosmogenic isotope background in Double Chooz.

Abe, Y; Barriere, J C; Baussan, E; Bekman, I; Bergevin, M; Bezerra, T J C; Bezrukov, L; Blucher, E; Buck, C; Busenitz, J; Cabrera, A; Caden, E; Camilleri, L; Carr, R; Cerrada, M; Chang, P -J; Chauveau, E; Chimenti, P; Collin, A P; Conover, E; Conrad, J M; Crespo-Anadón, J I; Crum, K; Cucoanes, A; Damon, E; Dawson, J V; Dietrich, D; Djurcic, Z; Dracos, M; Elnimr, M; Etenko, A; Fallot, M; von Feilitzsch, F; Felde, J; Fernandes, S M; Fischer, V; Franco, D; Franke, M; Furuta, H; Gil-Botella, I; Giot, L; Göger-Neff, M; Gonzalez, L F G; Goodenough, L; Goodman, M C; Grant, C; Haag, N; Hara, T; Haser, J; Hofmann, M; Horton-Smith, G A; Hourlier, A; Ishitsuka, M; Jochum, J; Jollet, C; Kaether, F; Kalousis, L N; Kamyshkov, Y; Kaplan, D M; Kawasaki, T; Kemp, E; de Kerret, H; Kryn, D; Kuze, M; Lachenmaier, T; Lane, C E; Lasserre, T; Letourneau, A; Lhuillier, D; Lima, H P; Lindner, M; no, J M López-Casta; LoSecco, J M; Lubsandorzhiev, B; Lucht, S; Maeda, J; Mariani, C; Maricic, J; Martino, J; Matsubara, T; Mention, G; Meregaglia, A; Miletic, T; Milincic, R; Minotti, A; Nagasaka, Y; Nikitenko, Y; Novella, P; Obolensky, M; Oberauer, L; Onillon, A; Osborn, A; Palomares, C; Pepe, I M; Perasso, S; Pfahler, P; Porta, A; Pronost, G; Reichenbacher, J; Reinhold, B; Röhling, M; Roncin, R; Roth, S; Rybolt, B; Sakamoto, Y; Santorelli, R; Schilithz, A C; Schönert, S; Schoppmann, S; Shaevitz, M H; Sharankova, R; Shimojima, S; Sibille, V; Sinev, V; Skorokhvatov, M; Smith, E; Spitz, J; Stahl, A; Stancu, I; Stokes, L F F; Strait, M; Stüken, A; Suekane, F; Sukhotin, S; Sumiyoshi, T; Sun, Y; Svoboda, R; Terao, K; Tonazzo, A; Thi, H H Trinh; Valdiviesso, G; Vassilopoulos, N; Veyssiere, C; Vivier, M; Wagner, S; Watanabe, H; Wiebusch, C; Winslow, L; Wurm, M; Yang, G; Yermia, F; Zimmer, V

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Muon Identification at ATLAS and CMS  

E-Print Network (OSTI)

Muonic final states will provide clean signatures formany physics processes at the LHC. The two LHC experiments ATLAS and CMS will be able to identify muons with a high reconstruction efficiency above 96% and a high transverse momentum resolution better than 2% for transverse momenta below 400 GeV/c and about 10% at 1 TeV/c. The two experiments follow complentary concepts of muon detection. ATLAS has an instrumented air-toroid mangetic system serving as a stand-alone muon spectrometer. CMS relies on high bending power and momentum resolution in the inner detector, and uses an iron yoke to increase its magnetic field. The iron yoke is instrumented with chambers used for muon identification. Therefore, muon momenta can only be reconstructed with high precision by combining inner-detector information with the data from the muon chambers.

Oliver Kortner

2007-07-06T23:59:59.000Z

202

Future Muon Dipole Moment Measurements  

E-Print Network (OSTI)

From the famous experiments of Stern and Gerlach to the present, measurements of magnetic dipole moments, and searches for electric dipole moments of ``elementary'' particles have played a major role in our understanding of sub-atomic physics. In this talk I discuss the progress on measurements and theory of the magnetic dipole moment of the muon. I also discuss a new proposal to search for a permanent electric dipole moment (EDM) of the muon and put it into the more general context of other EDM searches. These experiments, along with searches for the lepton flavor violating decays $\\mu \\to e \\gamma$ and $\\mu^- + A \\to e^- + A$, provide a path to the high-energy frontier through precision measurements.

B. Lee Roberts

2004-12-12T23:59:59.000Z

203

Radiative Decay of the Muon  

Science Journals Connector (OSTI)

The radiative decay of the muon, ?+?e++?+?e+?¯?, has been measured using muons from the Columbia University Nevis synchrocyclotron. The decay products e+ and ? were observed at relative angles near 180°, using scintillation counters and two 9-in.×10-in. NaI crystals, which enabled simultaneous measurement of the positron and ? energies. The pulses from the crystals were displayed on oscilloscopes and photographed, and the measured amplitudes of these pulses were calibrated using the positron spectrum of the nonradiative decay. The two-dimensional energy spectrum for positrons and ?'s was obtained for about 900 events, after subtraction of background. This spectrum and the measured rate, obtained by normalizing to the nonradiative decay, were compared with theoretical predictions for the radiative decay. The results were in good agreement with the theory, within statistics, for the case of pure V-A coupling.

E. Bogart; E. DiCapua; P. Némethy; A. Strelzoff

1967-04-25T23:59:59.000Z

204

Muon bremsstrahlung on heavy atoms  

Science Journals Connector (OSTI)

The cross section for high energy muon bremsstrahlung on heavy atoms is calculated without the use of the Born approximation. It is shown that the correction to the Born approximation in the region of momentum transfers q of the order of ?c has the same order of magnitude as the well-known correction of Davies, Bethe, and Maximon. It is shown also that these corrections have different signs and nearly compensate each other.

Yu. M. Andreev and E. V. Bugaev

1997-02-01T23:59:59.000Z

205

R&D PROPOSAL FOR THE NATIONAL MUON ACCELERATOR PROGRAM  

E-Print Network (OSTI)

specification for the stored muon energy is 25 GeV and theradiation allows high-energy muon bunches to be stored in ato deliver O(10 21 ) low energy muons per year within the

Zisman, Michael S.

2011-01-01T23:59:59.000Z

206

Equivalent dose rate by muons to the human body  

Science Journals Connector (OSTI)

......strongly on thickness(6). Muons lose energy in the atmosphere. The average rate of muon energy loss is where a(E) is the ionisation...coefficients as a function of muon energy for isotropic geometrical conditions......

I. Bacioiu

2011-11-01T23:59:59.000Z

207

PROTON BEAM REQUIREMENTS FOR A NEUTRINO FACTORY AND MUON COLLIDER  

E-Print Network (OSTI)

target concept. 4.1. Beam Energy The muons captured by theto bring the muons to the desired energy. The short lifetimeAt the energy frontier, the fact that the muon is a point

Zisman, Michael S.

2010-01-01T23:59:59.000Z

208

Frictional accumulation of negative muons and its application  

Science Journals Connector (OSTI)

A novel method is proposed for the efficient conversion of intermediate energy negative muons into a low-energy muon beam. It is based on using an electric field to eject muons from a moderator consisting of a la...

D. Taqqu

1996-01-01T23:59:59.000Z

209

Some thoughts on the production of muons for fusion catalysis  

Science Journals Connector (OSTI)

For muon-catalyzed fusion to be of practical interest, a very efficient means of producing muons must be found. We describe here some schemes for producing muons that may be more energy efficient than any heretof...

George Chapline; Ralph Moir

1986-09-01T23:59:59.000Z

210

Positive muon behavior in KCl with and without F centers  

Science Journals Connector (OSTI)

Positive muon behavior in KCl containing F centers has been studied. The muon spin depolarization rate showed a maximum near ... probably due to the fact that free positive muons are trapped by F centers in KCl. ...

Masao Doyama; T. Hatano; Y. Suzuki; R. Nakai; R. Yamamoto…

1984-01-01T23:59:59.000Z

211

Muon Production in Relativistic Cosmic-Ray Interactions  

E-Print Network (OSTI)

enough to study high p T muon production in air showers.production of far forward muons, potentially probing nuclearto this study of high p T muons. This work was supported in

Klein, Spencer

2010-01-01T23:59:59.000Z

212

The US Muon Accelerator Program (MAP)  

SciTech Connect

The US Department of Energy Office of High Energy Physics has recently approved a Muon Accelerator Program (MAP). The primary goal of this effort is to deliver a Design Feasibility Study for a Muon Collider after a 7 year R&D program. This paper presents a brief physics motivation for, and the description of, a Muon Collider facility and then gives an overview of the program. I will then describe in some detail the primary components of the effort.

Bross, Alan D.; /Fermilab

2010-12-01T23:59:59.000Z

213

The US Muon Accelerator Program (MAP)  

SciTech Connect

The US Department of Energy Office of High Energy Physics has recently approved a Muon Accelerator Program (MAP). The primary goal of this effort is to deliver a Design Feasibility Study for a Muon Collider after a 7 year R and D program. This paper presents a brief physics motivation for, and the description of, a Muon Collider facility and then gives an overview of the program. I will then describe in some detail the primary components of the effort.

Bross, Alan D. [Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)

2011-10-06T23:59:59.000Z

214

FEASIBILITY STUDY II OF A MUON BASED NEUTRINO SOURCE.  

SciTech Connect

The concept of using a muon storage ring to provide a well characterized beam of muon and electron neutrinos (a Neutrino Factory) has been under study for a number of years now at various laboratories throughout the world. The physics program of a Neutrino Factoryis focused on the relatively unexplored neutrino sector. In conjunction with a detector located a suitable distance from the neutrino source, the facility would make valuable contributions to the study of neutrino masses and lepton mixing. A Neutrino Factory is expected to improve the measurement accuracy of sin{sup 2}(2{theta}{sub 23}) and {Delta}m{sup 2}{sub 32} and provide measurements of sin{sup 2}(2{theta}{sub 13}) and the sign of {Delta}m{sup 2}{sub 32}. It may also be able to measure CP violation in the lepton sector.

GALLARDO,J.C.; OZAKI,S.; PALMER,R.B.; ZISMAN,M.

2001-06-30T23:59:59.000Z

215

Muons from high-energy cosmic photino  

Science Journals Connector (OSTI)

The muon production at photino-nucleon $$(\\bar \\gamma \\mathcal{N})$$ interaction for high-energy photino (E?)104GeV)...

V. S. Berezinsky; E. V. Bugaev; E. S. Zaslavskaya

216

Low energy atmospheric muon neutrinos in MACRO  

E-Print Network (OSTI)

The flux of low energy neutrinos (~ 4 GeV) has been studied with the MACRO detector at Gran Sasso via the detection of muon neutrinos interactions inside the apparatus, and of upward-going stopping muons. Data collected in ~3 y with the full apparatus were analyzed. The results are compatible with a deficit of the flux of atmospheric muon neutrinos from below, and no reduction from above, with respect to Monte Carlo predictions. The deficit and the angular distributions are interpreted in terms of neutrino oscillations, and compared with the MACRO results on the upward throughgoing muons (~ 100 GeV).

M. Spurio; for the MACRO Collaboration

1998-08-01T23:59:59.000Z

217

Upward Showering Muons in Super?Kamiokande  

Science Journals Connector (OSTI)

A small subset of neutrino?induced upward going muons in the Super?Kamiokande detector consists of high energy muons that undergo radiative energy losses through bremsstrahlung e + e ? pair production and photo?nuclear interactions. The mean energy of the parent neutrinos of these showering upward muons is approximately 1 TeV allowing the selection of a high energy sample of neutrinos. We present physics(mainly oscillation analysis) as well as astrophysical results with the upward showering muon dataset using about 1680 days of Super?K?I data.

Shantanu Desai; Super?Kamiokande Collaboration

2006-01-01T23:59:59.000Z

218

Magnetic moment of the negative muon  

Science Journals Connector (OSTI)

The most accurate value of the negative-muon magnetic moment, ??-=3.183 345(10)?p, is obtained by combining the negative-muon mass from x-ray transitions in muonic atoms and the reanalyzed negative-muon g factor with the proton magnetic moment in Bohr magnetons. The fractional uncertainty of 3.1×10-6 is 15 times more accurate than any previous direct measurement. The obtained ratio of the magnetic moments of the positive muon and the negative muon, ??+/??-=1.000 000 2(31), provides a test of CPT invariance at the level of 3 ppm. The negative-muon g factor g?- and the magnetic moment anomaly a?- derived for a test of CPT theorem are obtained from an approach now made possible using the new value of the negative-muon magnetic moment. To substantially improve the verification of the CPT theorem for the muon g factor, a much more precise value for ??-/?p is needed to determine the anomalous g factor a?- for the new Brookhaven National Laboratory muon g-2 experiment.

X. Fei

1994-02-01T23:59:59.000Z

219

Magnetic Moment of the Positive Muon  

Science Journals Connector (OSTI)

The magnetic moment of the positive muon has been measured relative to that of the proton by determining its precession frequency in a magnetic field measured by proton NMR. With both protons and muons bound in a spherical sample of water, the result is ????p?=3.183 362±0.000 030 (9.4 ppm). Including uncertainties due to the chemical environment of the muon, the result for free muons and protons is ???p=3.183 330±0.000 044 (14 ppm) which is consistent with recent measurements of the hyperfine splitting of muonium.

D. P. Hutchinson; F. L. Larsen; N. C. Schoen; D. I. Sober; A. S. Kanofsky

1970-06-01T23:59:59.000Z

220

Magnets for Muon 6D Cooling Channels  

SciTech Connect

The Helical Cooling Channel (HCC), an innovative technique for six-dimensional (6D) cooling of muon beams using a continuous absorber inside superconducting magnets, has shown considerable promise based on analytic and simulation studies. The implementation of this revolutionary method of muon cooling requires high field superconducting magnets that provide superimposed solenoid, helical dipole, and helical quadrupole fields. Novel magnet design concepts are required to provide HCC magnet systems with the desired fields for 6D muon beam cooling. New designs feature simple coil configurations that produce these complex fields with the required characteristics, where new high field conductor materials are particularly advantageous. The object of the program was to develop designs and construction methods for HCC magnets and design a magnet system for a 6D muon beam cooling channel. If successful the program would develop the magnet technologies needed to create bright muon beams for many applications ranging from scientific accelerators and storage rings to beams to study material properties and new sources of energy. Examples of these applications include energy frontier muon colliders, Higgs and neutrino factories, stopping muon beams for studies of rare fundamental interactions and muon catalyzed fusion, and muon sources for cargo screening for homeland security.

Johnson, Rolland [Muons, Inc.; Flanagan, Gene [Muons, Inc.

2014-09-10T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Electronic  

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

contribution contribution to friction on GaAs: An atomic force microscope study Yabing Qi, 1,2 J. Y. Park, 2 B. L. M. Hendriksen, 2 D. F. Ogletree, 2 and M. Salmeron 2,3 1 Applied Science and Technology Graduate Group, University of California, Berkeley, California 94720, USA 2 Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA 3 Department of Materials Sciences and Engineering, University of California, Berkeley, California 94720, USA ͑Received 23 January 2008; revised manuscript received 11 April 2008; published 7 May 2008͒ The electronic contribution to friction at semiconductor surfaces was investigated by using a Pt-coated tip with 50 nm radius in an atomic force microscope sliding against an n-type GaAs͑100͒ substrate. The GaAs surface was covered by an approximately 1 nm thick oxide layer. Charge accumulation

222

Muon to electron conversion: how to find an electron in a muon haystack  

Science Journals Connector (OSTI)

...accelerator-driven sub-critical reactors (ADSR), cancer therapy...conventional nuclear reactors, which makes it inherently...issues with ensuring the reliability of the accelerator beam...University Research Reactor Institute in Japan...software and physics analysis. In his spare time...

2010-01-01T23:59:59.000Z

223

Muon Flux at the Geographical South Pole  

E-Print Network (OSTI)

The muon flux at the South-Pole was measured for five zenith angles, $0^{\\circ}$, $15^{\\circ}$, $35^{\\circ}$, $82.13^{\\circ}$ and $85.15^{\\circ}$ with a scintillator muon telescope incorporating ice Cherenkov tank detectors as the absorber. We compare the measurements with other data and with calculations.

X. Bai; T. K. Gaisser; A. Karle; K. Rawlins; G. M. Spiczak; Todor Stanev

2006-02-17T23:59:59.000Z

224

Cross sections and energy loss for lepton pair production in muon transport  

E-Print Network (OSTI)

We reevaluate electron-positron pair production from electromagnetic interactions of muons in transit through materials. Our approach, through the use of structure functions for inelastic and elastic scattering and including hadronic recoil, make the formalism useful for tau pair production at high energies. Our results for electron-positron pair production agree well with prior evaluations. Tau pair production, has a significant contribution from inelastic scattering in addition to the usual coherent scattering with the nucleus and scattering with atomic electrons.

A. Bulmahn; M. H. Reno

2008-12-30T23:59:59.000Z

225

Status of the Fermilab Muon (g-2) Experiment  

E-Print Network (OSTI)

The New Muon $(g-2)$ Collaboration at Fermilab has proposed to measure the anomalous magnetic moment of the muon, $a_\\mu$, a factor of four better than was done in E821 at the Brookhaven AGS, which obtained $a_\\mu = [116 592 089 (63)] \\times 10^{-11}$ $\\pm 0.54$ ppm. The last digit of $a_{\\mu}$ is changed from the published value owing to a new value of the ratio of the muon-to-proton magnetic moment that has become available. At present there appears to be a difference between the Standard-Model value and the measured value, at the $\\simeq 3$ standard deviation level when electron-positron annihilation data are used to determine the lowest-order hadronic piece of the Standard Model contribution. The improved experiment, along with further advances in the determination of the hadronic contribution, should clarify this difference. Because of its ability to constrain the interpretation of discoveries made at the LHC, the improved measurement will be of significant value, whatever discoveries may come from the LHC.

B. Lee Roberts

2010-01-20T23:59:59.000Z

226

A LATTICE FOR THE 50 GEV MUON COLLIDER RING.  

SciTech Connect

A resent progress report on the lattice design of the 50-50 GeV muon collider is presented. The ring circumference needs to be as small as possible due to the short lifetime of the 50 GeV muons. The background at the detector is affected by the continuous decay of muons into electrons which requires a dipole between the high focusing quadrupoles and the detector. To obtain a luminosity on the order of 1 x 10{sup 33} cm{sup {minus}2} S{sup {minus}1} it is required to have beam intensities on the order of 1 x 10{sup 12} particles per bunch. The rms momentum spread of the beam is equal to 0.12% and the beta functions at the interaction point are equal to 4 cm. The maxima of the betatron functions at these quadrupoles are 1300 m, resulting in large chromaticities which must be corrected by local chromatic correction. Pairs of horizontal and vertical chromatic sextupoles are located at locations where the corresponding betatron functions are 100 m and the values of the horizontal dispersion functions are 3 and 2 m, respectively. They are carefully placed so that most of their nonlinear effects are canceled. The dynamic aperture is larger than 7 times the mean size of the beam for the momentum offsets larger than {minus}6 and +10 sigmas.

TRBOJEVIC,D.

1998-06-28T23:59:59.000Z

227

Recirculating Linac Accelerators For Future Muon Facilities  

SciTech Connect

Neutrino Factories (NF) and Muon Colliders (MC) require rapid acceleration of shortlived muons to multi-GeV and TeV energies. A Recirculating Linear Accelerator (RLA) that uses superconducting RF structures can provide exceptionally fast and economical acceleration to the extent that the focusing range of the RLA quadrupoles allows each muon to pass several times through each high-gradient cavity. A new concept of rapidly changing the strength of the RLA focusing quadrupoles as the muons gain energy is being developed to increase the number of passes that each muon will make in the RF cavities, leading to greater cost effectiveness. We discuss the optics and technical requirements for RLA designs, using RF cavities capable of simultaneous acceleration of both m+ and m- species. The design will include the optics for the multi-pass linac and droplet-shaped return arcs.

Yves Roblin, Alex Bogacz, Vasiliy Morozov, Kevin Beard

2012-04-01T23:59:59.000Z

228

Radiative muon absorption in calcium  

Science Journals Connector (OSTI)

The photon spectrum from radiative absorption of negative muons in Ca40 has been measured with a high-resolution pair spectrometer. The data are analyzed in order to determine the induced pseudoscalar coupling constant gp in nuclear matter. When compared to models which use a realistic nuclear response function and avoid the closure approximation, a value of gp/gA=4.0±1.5 is obtained, which indicates a quenching of this coupling compared to the nucleonic value by a factor 0.57±0.25.

A. Frischknecht; W. Stehling; G. Strassner; P. Truöl; J. C. Alder; C. Joseph; J. F. Loude; J. P. Perroud; D. Ruegger; T. M. Tran; W. Dahme; H. Panke; R. Kopp

1985-11-01T23:59:59.000Z

229

Muon Capture in Oxygen-16  

Science Journals Connector (OSTI)

The muon capture rate in oxygen is used as a means for measuring the induced pseudoscalar coupling constant (CP) of weak interactions. The capture rate between the JP=0+ ground state of O16 and the 0-, 1-, 2-, and 3- states of N16 are calculated as a function of CP with different nuclear models. Using the experimental values of the transition rates, we then determine CP. We find that the transition rate, and therefore CP, depends strongly on the nuclear model. We conclude that 5

Vincent Gillet and David A. Jenkins

1965-10-11T23:59:59.000Z

230

Comparison of Dominant Electron Trap Levels in n-Type and p-Type GaAsN Using Deep-Level Transient Spectroscopy  

SciTech Connect

Higher-efficiency solar cells improve the likelihood that concentrator photovoltaic systems will become cost effective. A four-junction GaAs- and Ge-based solar cell incorporating a 1-eV bandgap material has an ideal AM0 efficiency of ~40% and could also be used in a terrestrial concentrator module. The dilute-N GaAsN alloy's bandgap can be reduced to near 1 eV when the nitrogen content is 2% - 3%. Indium can also be added to the alloy to improve lattice matching to GaAs and Ge. We have used deep-level transient spectroscopy (DLTS) to characterize traps in both p-type and n-type GaAsN. For each type of material, the dominant DLTS signal corresponds to an electron trap having an activation energy of about 0.35 eV for p-type GaAsN and about 0.45 eV for n-type GaAsN. In both types of materials, the trap concentrations, modified by ..lambda..-effect factors, increase with both increasing N content and increased doping.

Johnston, S. W.; Kurtz, S. R.

2005-11-01T23:59:59.000Z

231

Muon Capture in Gaseous Hydrogen  

Science Journals Connector (OSTI)

An experiment to measure the muon nuclear capture rate in ultrapure gaseous hydrogen (8 atm, 293°K) has been performed using a special target in which a system of gas proportional counters, working with the pure hydrogen of the target itself, were operating. Neutrons from the capture reactions were detected using a scintillation-counter technique, and the ?-ray background was eliminated by pulse-shape discrimination. The working conditions ensured that the captures were taking place in ?p atomic systems in a singlet total-spin state. The experimental result is ?expt=651±57 sec-1, which has to be compared with the theoretical rate ?s, theor=626±26 sec-1. From the experimental capture rate, and within the framework of the currently accepted theory, we have obtained for the induced pseudoscalar coupling constant gp=(-7.3±3.7)gV. The results of the present experiment are analyzed, together with results obtained from stopping negative muons in liquid hydrogen.

A. Alberigi Quaranta; A. Bertin; G. Matone; F. Palmonari; G. Torelli; P. Dalpiaz; A. Placci; E. Zavattini

1969-01-25T23:59:59.000Z

232

Muon Collaboration Status 124 Scientists & Engineers from 33 Institutions  

E-Print Network (OSTI)

Muon Collaboration Status 124 Scientists & Engineers from 33 Institutions Co-spokespeople: Steve Meeting, 18 Nov. 2002 #12;Muon Collaboration 124 Scientists & Engineers from 33 Institutions 6 US Labs ANL Univ. Pohang Univ. RAL Tel Aviv Univ. Muon Collaboration #12;Steve Geer HEPAP 18 November 2002 3 Muon

233

Muon Telescope By Nandita Sampath and Izzy Harrison  

E-Print Network (OSTI)

Muon Telescope By Nandita Sampath and Izzy Harrison #12;Abstract We wanted to determine whether the count rate of muons per hour would be affected if we changed the angle that our muon telescope pointed to the roof of the parking garage so the muons could not be affected by surrounding

California at Santa Cruz, University of

234

Muon method for structural defects investigation in ferromagnetic metals  

Science Journals Connector (OSTI)

Equations describing depolarization of positive muons implanted in a pure crystalline ferromagnetic metal...

L. A. Kuzmin; V. P. Melnichuk; V. Yu. Miloserdin…

1986-12-01T23:59:59.000Z

235

The program in muon and neutrino physics: Superbeams, cold muon beams, neutrino factory and the muon collider  

SciTech Connect

The concept of a Muon Collider was first proposed by Budker [10] and by Skrinsky [11] in the 60s and early 70s. However, there was little substance to the concept until the idea of ionization cooling was developed by Skrinsky and Parkhomchuk [12]. The ionization cooling approach was expanded by Neufer [13] and then by Palmer [14], whose work led to the formation of the Neutrino Factory and Muon Collider Collaboration (MC) [3] in 1995. The concept of a neutrino source based on a pion storage ring was originally considered by Koshkarev [18]. However, the intensity of the muons created within the ring from pion decay was too low to provide a useful neutrino source. The Muon Collider concept provided a way to produce a very intense muon source. The physics potential of neutrino beams produced by muon storage rings was investigated by Geer in 1997 at a Fermilab workshop [19, 20] where it became evident that the neutrino beams produced by muon storage rings needed for the muon collider were exciting on their own merit. The neutrino factory concept quickly captured the imagination of the particle physics community, driven in large part by the exciting atmospheric neutrino deficit results from the SuperKamiokande experiment. As a result, the MC realized that a Neutrino Factory could be an important first step toward a Muon Collider and the physics that could be addressed by a Neutrino Factory was interesting in its own right. With this in mind, the MC has shifted its primary emphasis toward the issues relevant to a Neutrino Factory. There is also considerable international activity on Neutrino Factories, with international conferences held at Lyon in 1999, Monterey in 2000 [21], Tsukuba in 2001 [22], and another planned for London in 2002.

R. Raja et al.

2001-08-08T23:59:59.000Z

236

Muons in minimum bias events from the first CMS data  

SciTech Connect

Muon signatures are extremely important in the challenging environment of collisions at the LHC. Understanding the observed muon yield from Standard Model processes is the first task for all analyses involving muons. Basic muon kinematical observables are presented for the first CMS data at {radical}(s) = 7 TeV and compared with Monte Carlo expectations. The muon sample composition is studied by using the MC truth in terms of muons from heavy flavours, muons from light hadron decays and hadron punch-through is studied from MC truth.

Barbone, Lucia [Dipartimento Interateneo di Fisica and INFN Sezione di Bari, via E. Orabona 4, 70126 Bari (Italy)

2010-12-22T23:59:59.000Z

237

Technical Challenges and Scientific Payoffs of Muon Beam Accelerators for Particle Physics  

E-Print Network (OSTI)

particles, all of the muon beam energy is available forfootprint. Indeed, an energy frontier Muon Collider couldaccelerating muons to even higher energies of several TeV,

Zisman, Michael S.

2008-01-01T23:59:59.000Z

238

CHARM PRODUCTION BY MUONS AND ITS ROLE IN SCALE-NONINVARIANCE  

E-Print Network (OSTI)

histograms (a) Daughter muon energy. increases not Errorsstrong influence on muon energies, distribution approximatestate (the sum of the muon energies and the shower energy)

Gollin, G.D.

2014-01-01T23:59:59.000Z

239

Progress on a Cavity with Beryllium Walls for Muon Ionization Cooling Channel R&D.  

E-Print Network (OSTI)

WITH BERYLLIUM WALLS FOR MUON IONIZATION COOLING CHANNELNY 11973, USA Abstract The Muon Accelerator Program (MAP)an ionization cooling channel for muon beams. An ionization

Bowring, D.L.

2014-01-01T23:59:59.000Z

240

Multicharged ion source based on Penning-type discharge with electron cyclotron resonance heating by millimeter waves  

SciTech Connect

We suggest a Penning-type discharge as a trigger discharge for fast development of pulsed electron cyclotron resonance plasma. The Penning-type discharge glows at a low pressure as needed. Gyrotron radiation (75 GHz, 200 kW, 1 ms) was used for plasma heating. Fully striped helium ions were demonstrated, average charge of ions in the plasma was {approx_equal} 2. Experiment and calculations show that high charge states of heavier gases require lower initial pressure and longer development time. Only moderate charge states are achievable in this pulsed scheme.

Vodopyanov, A. V.; Izotov, I. V.; Mansfeld, D. A. [Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod (Russian Federation); Yushkov, G. Yu. [High Current Electronic Institute, Russian Academy of Sciences, Tomsk (Russian Federation)

2012-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

From Neutrino Factory to Muon Collider  

SciTech Connect

After summarizing the important commonalities between neutrino factories and muon colliders, the key differences are discussed. These include a much larger needed cooling factor ({approx}10{sup 6} in six-dimensional emittance), a smaller number of muon bunches (perhaps only one of each charge), and acceleration to much higher energy, implying significantly different technical choices for some of the cooling and acceleration subsystems. The final storage rings are also quite different. Nevertheless, a neutrino factory could serve as a key stepping stone on the path to a muon collider.

Kaplan, Daniel M. [Illinois Institute of Technology, Chicago, IL 60616 (United States)

2011-10-06T23:59:59.000Z

242

Muon energy-loss distribution and its applications to muon energy determination  

Science Journals Connector (OSTI)

For measurements of the cosmic-ray muon spectrum at energies above 100 TeV and for observations of high-energy astronomical neutrinos a big detector is necessary. In both cases, information on the muon energy plays an important role. The method for estimating the muon energy from the energy loss should yield accurate values with a big detector. To evaluate the method we measured the muon energy-loss distribution in the MUTRON detector and applied the results to a big detector proposed for deployment in the ocean. When estimating the muon energy we divided the muon track into several segments and discarded the segment with the maximum energy loss. If a detector with a volume of (500m)3 is constructed in the ocean using strings of detectors with 50-m spacing between adjacent strings, and 10-m spacing between detectors on a string, muon energies could be measured with a relative error of about 30%. For muons produced by the charged-current interaction (??+N??+X), the neutrino direction can be determined with an error less than 1° for muon energies above 1 TeV.

K. Mitsui

1992-05-01T23:59:59.000Z

243

Calibration of Muon Reconstruction Algorithms Using an External Muon Tracking System at the Sudbury Neutrino Observatory  

E-Print Network (OSTI)

To help constrain the algorithms used in reconstructing high-energy muon events incident on the Sudbury Neutrino Observatory (SNO), a muon tracking system was installed. The system consisted of four planes of wire chambers, which were triggered by scintillator panels. The system was integrated with SNO's main data acquisition system and took data for a total of 95 live days. Using cosmic-ray events reconstructed in both the wire chambers and in SNO's water Cherenkov detector, the external muon tracking system was able to constrain the uncertainty on the muon direction to better than 0.6 degrees.

SNO Collaboration

2011-05-06T23:59:59.000Z

244

Radiative muon capture in hydrogen  

Science Journals Connector (OSTI)

We analyze the radiative capture of the negative muon in hydrogen using amplitudes derived within the chiral Lagrangian approach. Besides the leading and next to leading order terms, given by the well-known Rood-Tolhoek Hamiltonian, we extract from these amplitudes the corrections of the next order in 1/M (M is the nucleon mass). In addition, we estimate within the same formalism also the ?(1232) isobar excitation effects and processes described by an anomalous Lagrangian. The model we consider allows us to put the ? isobar off-shell. Our calculations show sensitivity of capture rates and photon spectra to Z, one of the off-shell parameters, related to the ?N? vertex. We have found that the model can provide the photon spectra, which are in the interval 60?MeV<~k<~kmax (k is the photon momentum) close to the experimental one.

E. Truhlík and F. C. Khanna

2002-04-01T23:59:59.000Z

245

Radiative muon capture in nuclei  

Science Journals Connector (OSTI)

The energy spectra of photons following negative muon absorption in C12, O16, Al27, Ca40, Fenat, Ho165, and Bi209 have been measured with two NaI spectrometers. The branching ratios for the emission of high energy photons give information on the induced pseudoscalar coupling constant gP in nuclear matter. The data for light nuclei are in agreement with the theoretical calculations using the nucleonic value of gP?7gA predicted by the partially conserved axial vector current hypothesis, while significantly lower values of gP are required to fit the data of the heavier elements with presently existing theoretical predictions. Disregarding the remaining theoretical uncertainties, these results can be interpreted as a further indication of the renormalization of the nucleonic form factors inside the nucleus.

M. Döbeli; M. Doser; L. van Elmbt; M. W. Schaad; P. Truöl; A. Bay; J. P. Perroud; J. Imazato; T. Ishikawa

1988-04-01T23:59:59.000Z

246

On LHCb muon MWPC grounding  

E-Print Network (OSTI)

My goal is to study how a big MWPC system, in particular the LHCb muon system, can be protected against unstable operation and multiple spurious hits, produced by incorrect or imperfect grounding in the severe EM environment of the LHCb experiment. A mechanism of penetration of parasitic current from the ground loop to the input of the front-end amplifier is discussed. A new model of the detector cell as the electrical bridge is considered. As shown, unbalance of the bridge makes detector to be sensitive to the noise in ground loop. Resonances in ground loop are specified. Tests of multiple-point and single-point grounding conceptions made on mock-up are presented.

Kashchuk, A

2006-01-01T23:59:59.000Z

247

The muon capture in {sup 16}O: the angular and polarization correlations  

SciTech Connect

Longitudinal polarization of the daughter nuclei {sup 16}N which arises in Micro-Sign {sup -} capture on {sup 16}O as a function of the recoil angle, together with the angular distribution and the alignment of the recoil nucleus are calculated. The neutrinos born escape mainly along the muon spin. The polarization is found to vary from zero (recoil momentum counter to the muon spin direction) up to 50% (along the muon spin direction). The results can be applied to the experimental tests of T conservation, to the analysis of the projects of constructing the powerful mono-energetic neutrino sources, to the experimental study of the pseudo-scalar form factor and the K-electron capture, and to other spin-polarization correlation experiments.

Karpeshin, F. F., E-mail: fkarpeshin@yandex.ru [University of Buenos Aires (Argentina); Isakov, V. I., E-mail: visakov@thd.pnpi.spb.ru [Petersburg Nuclear Physics Institute (Russian Federation)

2012-02-15T23:59:59.000Z

248

Electron  

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

to measure the electron density gradient and its fluctuations. Two separate laser beams with slight spatial offset and frequency difference are coupled into a single mixer...

249

Cosmic-ray muons at ultrahigh energies  

Science Journals Connector (OSTI)

Fluxes of cosmic-ray muons were estimated over the energy range extending up to 1010 GeV. Data on the production of pions; kaons; ?, ??, ?, ?, and ? mesons; charmed particles; and J/?...mesons from accelerator ex...

L. V. Volkova

2011-02-01T23:59:59.000Z

250

Early Work on the Positron and Muon  

Science Journals Connector (OSTI)

Early work on the positron and muon is described in an informal way with emphasis on those aspects of the work which normally would not find their way into the literature.

C. D. Anderson

1961-01-01T23:59:59.000Z

251

Muon capture rates within the projected QRPA  

E-Print Network (OSTI)

The conservation of the number of particles within the QRPA plays an important role in the evaluation muon capture rates in all light nuclei with A \\precsim 30 . The violation of the CVC by the Coulomb field in this mass region is of minor importance, but this effect could be quite relevant for medium and heavy nuclei studied previously. The extreme sensitivity of the muon capture rates on the 'pp' coupling strength in nuclei with large neutron excess when described within the QRPA is pointed out. We reckon that the comparison between theory and data for the inclusive muon capture is not a fully satisfactory test on the nuclear model that is used. The exclusive muon transitions are much more robust for such a purpose.

Danilo Sande Santos; Arturo R. Samana; Francisco Krmpoti?; Alejandro J. Dimarco

2012-03-03T23:59:59.000Z

252

POSSIBLE EVIDENCE FOR A FISK-TYPE HELIOSPHERIC MAGNETIC FIELD. I. ANALYZING ULYSSES/KET ELECTRON OBSERVATIONS  

SciTech Connect

The propagation of energetic charged particles in the heliospheric magnetic field is one of the fundamental problems in heliophysics. In particular, the structure of the heliospheric magnetic field remains an unsolved problem and is discussed as a controversial topic. The first successful analytic approach to the structure of the heliospheric magnetic field was the Parker field. However, the measurements of the Ulysses spacecraft at high latitudes revealed the possible need for refinements of the existing magnetic field model during solar minimum. Among other reasons, this led to the development of the Fisk field. This approach is highly debated and could not be ruled out with magnetic field measurements so far. A promising method to trace this magnetic field structure is to model the propagation of electrons in the energy range of a few MeV. Employing three-dimensional and time-dependent simulations of the propagation of energetic electrons, this work shows that the influence of a Fisk-type field on the particle transport in the heliosphere leads to characteristic variations of the electron intensities on the timescale of a solar rotation. For the first time it is shown that the Ulysses count rates of 2.5-7 MeV electrons contain the imprint of a Fisk-type heliospheric magnetic field structure. From a comparison of simulation results and the Ulysses count rates, realistic parameters for the Fisk theory are derived. Furthermore, these parameters are used to investigate the modeled relative amplitudes of protons and electrons, including the effects of drifts.

Sternal, O.; Heber, B.; Kopp, A. [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, Leibnizstr. 11, 24118 Kiel (Germany); Engelbrecht, N. E.; Burger, R. A.; Ferreira, S. E. S.; Potgieter, M. S. [Center for Space Research, North-West University, 2520 Potchefstroom, South Africa. (South Africa); Fichtner, H.; Scherer, K., E-mail: oliver.sternal@rub.de [Institut fuer Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universitaet Bochum, 44780 Bochum, Germany. (Germany)

2011-11-01T23:59:59.000Z

253

A design for a combined function superconducting dipole for a muon collider FFAG accelerator  

E-Print Network (OSTI)

A muon at rest (the muon rest mass energy Br = 106 Me V) hasacceleration of the muons from their energy in the coolingaccelerator. As the energy of the muon beam increases, the

Green, M.A.

2011-01-01T23:59:59.000Z

254

Search for the Standard Model Higgs Boson Produced in Association with a Z Boson in the Electron-Muon Final State and the Higgs Boson Decaying into Bottom Quarks.  

E-Print Network (OSTI)

??A search for the standard model Higgs boson is presented in the associated production channel Z(??)H(bb) where each tau decays leptonically, one to an electron,… (more)

Bartek, Rachel A.

2013-01-01T23:59:59.000Z

255

Muon anomalous magnetic moment due to the brane-stretching effect  

E-Print Network (OSTI)

We investigate the contribution of extra dimensions to the muon anomalous magnetic moment by using an ADD-type 6-dimensional model. This approach analyzes the extent of the influence of classical brane fluctuations on the magnetic moment. When we consider that the brane fluctuations are static in time, they add new potential terms to the Schr{\\"o}dinger equation through the induced vierbein. This paper shows that the brane fluctuation is responsible for the brane-stretching effect. This effect would be capable of reproducing the appropriate order for recent Brookhaven National Laboratory measurements of the muon (g-2) deviation.

Konosuke Sawa

2005-06-20T23:59:59.000Z

256

Muon-Proton Scattering and Possible Anomalous Interaction of the Muon  

Science Journals Connector (OSTI)

It is argued that a possible anomalous interaction of the muon of the form if?¯????? can be large enough to account for the ?-pe-p cross-section ratio and yet it is not inconsistent with the present comparison for the theoretical and experimental values of the anomalous magnetic moment of the muon.

D. Kiang and S. H. Ng

1970-11-01T23:59:59.000Z

257

s-Channel Higgs Boson Production at a Muon-Muon Collider  

Science Journals Connector (OSTI)

High luminosity muon-muon colliders would provide a powerful new probe of Higgs boson physics through s-channel resonance production. We discuss the prospects for detection of Higgs bosons and precision measurements of their masses and widths at such a machine.

V. Barger; M. S. Berger; J. F. Gunion; T. Han

1995-08-21T23:59:59.000Z

258

The muon charge ratio in cosmic ray air showers  

E-Print Network (OSTI)

The muon charge ratio of the lateral muon density distributions in single EAS is studied by simulations, in context of recent proposals to measure this observable in coincidence with EAS observations. While effects of the hadronic interaction do not lead to significant differences of the total muon plus and muon minus content, the differences of the azimuthal variation of the muon densities of opposite charges and the azimuthal variation of the muon charge ratio appear to be very much pronounced, dependent on the direction of EAS incidence. This is due to the influence of the geomagnetic field which induces related effects in radio emission from extended air showers.

H. Rebel; O. Sima; A. Haungs; C. Manailescu; B. Mitrica; C. Morariu

2008-06-29T23:59:59.000Z

259

Passive Imaging of Warhead-Like Configurations Using Cosmic-Ray Muons  

SciTech Connect

Cosmic-Muon-Based Interrogation has untapped potential for national security. This presentation describes muons-based passive interrogation techniques.

Schwellenbach, D.

2012-07-17T23:59:59.000Z

260

Electron  

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

Electron thermal transport within magnetic islands in the reversed-field pinch a... H. D. Stephens, 1,b D. J. Den Hartog, 1,3 C. C. Hegna, 1,2 and J. A. Reusch 1 1 Department of...

Note: This page contains sample records for the topic "types electron muon" 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

Prospects for ultra-low-energy muon beam at J-PARC  

Science Journals Connector (OSTI)

Spin-polarized ultra-low-energy muons (LE-?+) with energies in eV–keV range provide a sensitive magnetic microprobe for studying near-surface regions, thin-film samples, multi-layered materials, etc. with depth resolution on a nanometer scale. Yet, worldwide there is currently only one (continuous) source of low-energy muons that is routinely used for such measurements. A pulsed source with many unique parameters (such as low-energy resolution of ?14 eV, time resolution of 7 ns, low background and spot size of just 4 mm) has been demonstrated at RIKEN-RAL muon facility at ISIS, but its use is limited by a rate of only 15 ?+/s. The method of low-energy muon generation is based on a resonant laser ionization of thermal energy muonium and is ideally suited for a pulsed muon source such as J-PARC MUSE, since the pulse structure of the generated LE-?+ is then determined by the laser pulse duration. The double pulse structure of the surface muon beam can, therefore, be converted to a single LE-?+ pulse with a pulse duration that can be as short as 1 ns and can also be externally triggered. J-PARC is designed to deliver surface muon beam with rates up to 4×108 ?+/s and direct transfer of the same laser technology from RIKEN-RAL to J-PARC would provide a LE-?+ beam with rates comparable to the existing continuous LE-?+ beam at PSI (?104 LE-?+/s). An improvement in the laser pulse energy could lead to a higher efficiency and higher rates up to 106 LE-?+/s may be possible. Construction of an intense LE-?+ beamline at J-PARC MUSE would open up the possibility to do routine depth-dependent ?SR measurements with thin film samples, with the muon implantation depth as low as 1 nm. In addition, the unique capability to synchronize the muon implantation with the sample excitation (e.g. by another laser or rf pulse) would allow to carry out pump-probe-type experiments.

Pavel Bakule; Yasuyuki Matsuda; Yasuhiro Miyake; Kanetada Nagamine; Koichiro Shimomura; Patrick Strasser; Shunshuke Makimura; Masahiko Iwasaki

2009-01-01T23:59:59.000Z

262

Self-Doping, O2-Stable, n-Type Interfacial Layer for Organic Electronics  

SciTech Connect

Solid films of a water-soluble dicationic perylene diimide salt, perylene bis(2-ethyltrimethylammonium hydroxide imide), Petma{sup +}OH{sup -}, are strongly doped n-type by dehydration and reversibly de-doped by hydration. The hydrated films consist almost entirely of the neutral perylene diimide, PDI, while the dehydrated films contain {approx}50% PDI anions. The conductivity increases by five orders of magnitude upon dehydration, probably limited by film roughness, while the work function decreases by 0.74 V, consistent with an n-type doping density increase of {approx}12 orders of magnitude. Remarkably, the PDI anions are stable in dry air up to 120 C. The work function of the doped film, {phi} (3.96 V vs. vacuum), is unusually negative for an O{sub 2}-stable contact. Petma{sup +} OH{sup -} is also characterized as an interfacial layer, IFL, in two different types of organic photovoltaic cells. Results are comparable to state of the art cesium carbonate IFLs, but may improve if film morphology can be better controlled. The films are stable and reversible over many months in air and light. The mechanism of this unusual self-doping process may involve the change in relative potentials of the ions in the film caused by their deshielding and compaction as water is removed, leading to charge transfer when dry.

Reilly, T. H. III; Hains, A. W.; Chen, H. Y.; Gregg, B. A.

2012-04-01T23:59:59.000Z

263

Protection from muons in high energy proton accelerators  

Science Journals Connector (OSTI)

A generalization of the works on muon shielding in proton accelerators is carried out. Coulomb scattering of muons, energy losses in ionization and excitation of atoms, ... p-nuclear interaction. Results of compu...

V. I. Gurentsov; L. R. Kimel'; O. N. Salimov

1972-04-01T23:59:59.000Z

264

Energy measurement of muons above 1 TeV  

Science Journals Connector (OSTI)

Pair production and bremsstrahlung cross-sections have sufficient magnitude and energy-dependence for muons above 1 TeV to suggest the use of these cross-sections for measurement of muon energies. A series of Mon...

M. K. Moe

1970-03-11T23:59:59.000Z

265

Muon-induced backgrounds in the CUORICINO experiment  

E-Print Network (OSTI)

code simulated the muon energy and angular distribution inthe direction and energy of the muons underground. The rangemuon and bolometer counts / 1 keV Low LowEnergyRegion Energy

Andreotti, E.

2010-01-01T23:59:59.000Z

266

Low-energy muons in extensive air showers (EAS)  

Science Journals Connector (OSTI)

A small air shower array of 21 detectors in conjunction with two shielded muon magnetic spectrographs has been operated for detection of muons of momentum in the range (2÷500...o...45? N at North Bengal Universit...

D. K. Basak; N. Chaudhuri; S. Sarkar; B. Bhattacharya; B. Ghosh

267

Low energy muons as probes of thin films and surfaces  

Science Journals Connector (OSTI)

Polarized muons with kinetic energies of a few eV (epithermal ?+...) can be generated by slowing down energetic muons in appropriate moderators consisting of a thin ... on a substrate. The availability of polariz...

E. Morenzoni

1997-07-01T23:59:59.000Z

268

Temperature variations in the flux of high-energy muons  

Science Journals Connector (OSTI)

The flux of high-energy muons (threshold energy, 220 GeV) as a function of ... the correlation coefficient between the counting rate of muons and the temperature of the atmosphere at...

M. G. Kostyuk; V. B. Petkov…

2011-06-01T23:59:59.000Z

269

The Anomalous Magnetic Moment of the Muon: A Theoretical Introduction  

Science Journals Connector (OSTI)

In February 2001, the Muon (g-2) Collaboration of the E821 experiment at the Brookhaven AGS released a new value of the anomalous magnetic moment of the muon a ? , mea...

Marc Knecht

2004-01-01T23:59:59.000Z

270

Muon States in Polycrystalline and Amorphous Silicon [and Discussion  

Science Journals Connector (OSTI)

15 February 1995 research-article Muon States in Polycrystalline and Amorphous Silicon [and Discussion] E. A. Davis A. Singh S. F. J. Cox A. M. Stoneham M. Symons Muons implanted into polycrystalline and amorphous silicon have been...

1995-01-01T23:59:59.000Z

271

Muon Diagnostics: A New Technique of Heliosphere Investigations  

Science Journals Connector (OSTI)

A new technique of remote monitoring of dynamic processes in the heliosphere (muon diagnostics) has been presented. The approach ... analysis of spatial-angular and temporal variations of muon flux detected at th...

A. A. Petrukhin

2009-04-01T23:59:59.000Z

272

-mixing, the e+ vs puzzle and the muon g -2  

E-Print Network (OSTI)

- mixing, the e+ e- vs puzzle and the muon g - 2 Fred Jegerlehner HU Berlin/DESY Zeuthen, fjeger. Consequences for the muon g - 2 are discussed. Work in collaboration with Robert Szafron [e-Print: arXiv:1101

Röder, Beate

273

Strongest Pulsed Muon Source at J-PARC MUSE  

SciTech Connect

The muon science facility (MUSE, abbreviation of MUon Science Establishment), along with the neutron, hadron, and neutrino facilities, is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. On the November, 2009 beam cycle, we achieved extraction of the world's strongest pulsed muon beam at J-PARC MUSE by beam tuning at the Decay-Surface muon beam line (D-line). Surface muons ({mu}{sup +}) as much as 1.8x10{sup 6}/s were extracted with the use of 120 kW of protons from the Rapid Cycle Synchrotron (RCS), which corresponds to 1.5x10{sup 7}/s surface muons when a future proton beam reached at the intensity of 1MW. These intensities, at the future 1 MW operation, will correspond to more than ten times those at the RIKEN-RAL Muon facility.

Miyake, Y.; Shimomura, K.; Kawamura, N.; Strasser, P.; Koda, A.; Fujimori, H.; Makimura, S.; Nakahara, K.; Kato, M.; Takeshita, S.; Nishiyama, K.; Kobayashi, Y.; Kojima, K.; Kadono, R. [Meson Science Laboratory, High Energy Accelerator Research Organization, Ibaraki 305-0801 (Japan); Muon Section, Materials and Life Science Division, J-PARC Center, Ibaraki 319-1195 (Japan); Higemoto, W.; Ito, T.; Ninomiya, K. [Muon Section, Materials and Life Science Division, J-PARC Center, Ibaraki 319-1195 (Japan); Japan Atomic Energy Research Center (JAEA), Ibaraki 319-1195 (Japan); Hiraishi, M.; Miyazaki, M. [Department of Materials Structure Science, Graduate University for Advanced Studies (Japan); Kubo, K. [Graduate School Division of Natural Sciences, International Christian University, Mitaka, Tokyo (Japan)

2011-10-06T23:59:59.000Z

274

Electron  

Science Journals Connector (OSTI)

Absolute grand total cross sections (TCSs) for electron-disilane (Si2H6) scattering have been measured over the energy range from 1 to 370 eV in a linear transmission experiment. The low-energy TCS is dominated by a broad resonant-like enhancement. In the region of the maximum the present grand TCS values appeared to be distinctly lower than previously reported integral elastic cross section data. A comparison of total electron scattering cross sections for the two simplest silicon hydrides and relevant hydrocarbons is given.

Czeslaw Szmytkowski; Pawel Mozejko; Grzegorz Kasperski

2001-01-01T23:59:59.000Z

275

Muon-Catalyzed Nuclear Fusion for Energy Production  

Science Journals Connector (OSTI)

The physics of muon-catalyzed fusion is summarized and discussed in the perspective of energy production.

S. Eliezer

1987-01-01T23:59:59.000Z

276

Studies of muon-induced radioactivity at NuMI  

SciTech Connect

The JASMIN Collaboration has studied the production of radionuclides by muons in the muon alcoves of the NuMI beamline at Fermilab. Samples of aluminum and copper are exposed to the muon field and counted on HpGe detectors when removed to determine their content of radioactive isotopes. We compare the results to MARS simulations and discuss the radiological implications for neutrino factories and muon colliders.

Boehnlein, David j.; Leveling, A.F.; Mokhov, N.V.; Vaziri, K.; /Fermilab; Iwamoto, Y.; Kasugai, Y.; Matsuda, N.; Nakashima, H.; Sakamoto, Y.; /JAEA, Ibaraki; Hagiwara, M.; Iwase, Hiroshi; /KEK, Tsukuba /Kyoto U., KURRI /Pohang Accelerator Lab. /Shimizu, Tokyo /Tohoku U.

2009-12-01T23:59:59.000Z

277

Muon Figures: 2001/04/19 Chris Waltham  

E-Print Network (OSTI)

Muon Figures: 2001/04/19 Chris Waltham Hanging Wall 65 Looking o o ~25 S of W Fault Line r=2730 r) and replaced with back#12;ll. The grid is 1000' (#25;300m) square. p Muon Track Light from Muon Xf PSUP Impact Parameter at time Tf Muon leaves PSUP V h Cherenkov Cone Figure 3: Fitting Diagram 2 #12; ) (degrees) fit v

Learned, John

278

Muon spin relaxation in CeCu2Si2 and muon knight shift in various heavy-fermion systems  

Science Journals Connector (OSTI)

Positive muon spin precession has been observed in various...2.1Si2, the relaxation rate of muon spins increases rapidly with decreasing temperature below...C.... This is interpreted as the results of the inhomog...

Y. J. Uemura; W. J. Kossler; B. Hitti; J. R. Kempton…

1986-12-01T23:59:59.000Z

279

The Production of Prompt Cosmic Ray Muons and Neutrinos  

Science Journals Connector (OSTI)

......observed. Direct measurements of the muon energy spectrum at sea-level have been...from D-meson, we get the prompt muon energy spectrum. And the spectrum is...Figure 5 compares the integral muon energy spectra at sea level of conven......

Hiroshi Inazawa; Keizo Kobayakawa

1983-04-01T23:59:59.000Z

280

Energy spectrum of cosmic-ray muons at sea level  

Science Journals Connector (OSTI)

The integral energy spectrum of cosmic-ray muons at sea level in the energy range (200÷7500) GeV is deduced ... this, the effect of fluctuations in the energy losses of muons is taken into account. The deduced muon

S. Miyake; V. S. Narasimham; P. V. Ramana Murthy

1964-01-16T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

COMPUTATIONAL MODELING OF MUONS PASSING THROUGH GAS PRESSURED RF CAVITIES  

E-Print Network (OSTI)

of muons passing through matter. PHYSICAL MODEL We start our study with a classical scattering of muonsCOMPUTATIONAL MODELING OF MUONS PASSING THROUGH GAS PRESSURED RF CAVITIES A. Samolov, A. Godunov, and to validate a technical design of these new accelerating facilities, accu- rate and comprehensive simulations

Godunov, Alexander L.

282

PROTON BEAM REQUIREMENTS FOR A NEUTRINO FACTORY AND MUON COLLIDER  

SciTech Connect

Both a Neutrino Factory and a Muon Collider place stringent demands on the proton beam used to generate the desired beam of muons. Here we discuss the advantages and challenges of muon accelerators and the rationale behind the requirements on proton beam energy, intensity, bunch length, and repetition rate. Example proton driver configurations that have been considered in recent years are also briefly indicated.

Zisman, Michael S.

2009-12-11T23:59:59.000Z

283

A Muon and Neutron Study of Multiferroic Materials  

E-Print Network (OSTI)

A Muon and Neutron Study of Multiferroic Materials Heather Joanne Lewtas University of Oxford #12;A Muon and Neutron Study of Multiferroic Materials Heather Joanne Lewtas Linacre College performed to try and identify muon stopping sites. The family of rare earth chromites have been studied

Boothroyd, Andrew

284

Muon-spin-rotation studies of organic magnets  

Science Journals Connector (OSTI)

...organized by P. Day and A. E. Underhill Muon-spin-rotation studies of organic magnets...Laboratory, Parks Road, Oxford OX1 3PU, UK A muon is an unstable spin- particle with a lifetime...s. Beams of spin-polarized positive muons can be prepared at accelerator facilities...

1999-01-01T23:59:59.000Z

285

Atlas Muon MDT Readout 06 December 2000 Thei Wijnen 1  

E-Print Network (OSTI)

Atlas Muon MDT Readout 06 December 2000 Thei Wijnen 1 "Slow controls" of MROD · System overview/Strobe Separator S 1 18 CSM 18 x TDC #18 #12;Atlas Muon MDT Readout 06 December 2000 Thei Wijnen 2 06 December 2000-bus" Network #12;Atlas Muon MDT Readout 06 December 2000 Thei Wijnen 3 06 December 2000 T. Wijnen 5 Memory

van Suijlekom, Walter

286

Summary of Muon Working Group B. Lee Roberts  

E-Print Network (OSTI)

BOSTON UNIVERSITY Summary of Muon Working Group Report on ¡ ¢ £ , EDM and ¤¦¥ B. Lee Roberts UNIVERSITY The Program of Muon Physics: § ¨© experiment to 0.05 ppm. § Muon EDM to cm. § Limit, Kyoto, September 2002 ­ p.3/25 #12;BOSTON UNIVERSITY Machine Requirements These experiments (except

Roberts, B. Lee

287

Muon (g-2) Technical Design Report  

E-Print Network (OSTI)

The Muon (g-2) Experiment, E989 at Fermilab, will measure the muon anomalous magnetic moment a factor-of-four more precisely than was done in E821 at the Brookhaven National Laboratory AGS. The E821 result appears to be greater than the Standard-Model prediction by more than three standard deviations. When combined with expected improvement in the Standard-Model hadronic contributions, E989 should be able to determine definitively whether or not the E821 result is evidence for physics beyond the Standard Model. After a review of the physics motivation and the basic technique, which will use the muon storage ring built at BNL and now relocated to Fermilab, the design of the new experiment is presented. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-2/3 approval.

J. Grange; V. Guarino; P. Winter; K. Wood; H. Zhao; R. M. Carey; D. Gastler; E. Hazen; N. Kinnaird; J. P. Miller; J. Mott; B. L. Roberts; J. Benante; J. Crnkovic; W. M. Morse; H. Sayed; V. Tishchenko; V. P. Druzhinin; B. I. Khazin; I. A. Koop; I. Logashenko; Y. M. Shatunov; E. Solodov; M. Korostelev; D. Newton; A. Wolski; R. Bjorkquist; N. Eggert; A. Frankenthal; L. Gibbons; S. Kim; A. Mikhailichenko; Y. Orlov; D. Rubin; D. Sweigart; D. Allspach; G. Annala; E. Barzi; K. Bourland; G. Brown; B. C. K. Casey; S. Chappa; M. E. Convery; B. Drendel; H. Friedsam; T. Gadfort; K. Hardin; S. Hawke; S. Hayes; W. Jaskierny; C. Johnstone; J. Johnstone; V. Kashikhin; C. Kendziora; B. Kiburg; A. Klebaner; I. Kourbanis; J. Kyle; N. Larson; A. Leveling; A. L. Lyon; D. Markley; D. McArthur; K. W. Merritt; N. Mokhov; J. P. Morgan; H. Nguyen; J-F. Ostiguy; A. Para; C. C. Polly M. Popovic; E. Ramberg; M. Rominsky; D. Schoo; R. Schultz; D. Still; A. K. Soha; S. Strigonov; G. Tassotto; D. Turrioni; E. Villegas; E. Voirin; G. Velev; D. Wolff; C. Worel; J-Y. Wu; R. Zifko; K. Jungmann; C. J. G. Onderwater; P. T. Debevec; S. Ganguly; M. Kasten; S. Leo; K. Pitts; C. Schlesier; M. Gaisser; S. Haciomeroglu; Y-I. Kim; S. Lee; M-J Lee; Y. K. Semertzidis; K. Giovanetti; V. A. Baranov; V. N. Duginov; N. V. Khomutov; V. A. Krylov; N. A. Kuchinskiy; V. P. Volnykh; C. Crawford; R. Fatemi; W. P. Gohn; T. P. Gorringe; W. Korsch; B. Plaster; A. Anastasi; D. Babusci; S. Dabagov; C. Ferrari; A. Fioretti; C. Gabbanini; D. Hampai; A. Palladino; G. Venanzoni; T. Bowcock; J. Carroll; B. King; S. Maxfield; K. McCormick; A. Smith; T. Teubner; M. Whitley; M. Wormald; R. Chislett; S. Kilani; M. Lancaster; E. Motuk; T. Stuttard; M. Warren; D. Flay; D. Kawall; Z. Meadows; T. Chupp; R. Raymond; A. Tewlsey-Booth; M. J. Syphers; D. Tarazona; C. Ankenbrandt; M. A. Cummings; R. P. Johnson; C. Yoshikawa; S. Catalonotti; R. Di Stefano; M. Iacovacci; S. Mastroianni; S. Chattopadhyay; M. Eads; M. Fortner; D. Hedin; N. Pohlman; A. de Gouvea; H. Schellman; L. Welty-Rieger; T. Itahashi; Y. Kuno; K. Yai; F. Azfar; S. Henry; G. D. Alkhazov; V. L. Golovtsov; P. V. Neustroev; L. N. Uvarov; A. A. Vasilyev; A. A. Vorobyov; M. B. Zhalov; L. Cerrito; F. Gray; G. Di Sciascio; D. Moricciani; C. Fu; X. Ji; L. Li; H. Yang; D. Stöckinger; G. Cantatore; D. Cauz; M. Karuza; G. Pauletta; L. Santi; S. Bae\\ssler; M. Bychkov; E. Frlez; D. Pocanic; L. P. Alonzi; M. Fertl; A. Fienberg; N. Froemming; A. Garcia; D. W. Hertzog J. Kaspar; P. Kammel; R. Osofsky; M. Smith; E. Swanson; T. van Wechel; K. Lynch

2015-01-27T23:59:59.000Z

288

Muon (g-2) Technical Design Report  

E-Print Network (OSTI)

The Muon (g-2) Experiment, E989 at Fermilab, will measure the muon anomalous magnetic moment a factor-of-four more precisely than was done in E821 at the Brookhaven National Laboratory AGS. The E821 result appears to be greater than the Standard-Model prediction by more than three standard deviations. When combined with expected improvement in the Standard-Model hadronic contributions, E989 should be able to determine definitively whether or not the E821 result is evidence for physics beyond the Standard Model. After a review of the physics motivation and the basic technique, which will use the muon storage ring built at BNL and now relocated to Fermilab, the design of the new experiment is presented. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-2/3 approval.

Grange, J; Winter, P; Wood, K; Zhao, H; Carey, R M; Gastler, D; Hazen, E; Kinnaird, N; Miller, J P; Mott, J; Roberts, B L; Benante, J; Crnkovic, J; Morse, W M; Sayed, H; Tishchenko, V; Druzhinin, V P; Khazin, B I; Koop, I A; Logashenko, I; Shatunov, Y M; Solodov, E; Korostelev, M; Newton, D; Wolski, A; Bjorkquist, R; Eggert, N; Frankenthal, A; Gibbons, L; Kim, S; Mikhailichenko, A; Orlov, Y; Rubin, D; Sweigart, D; Allspach, D; Annala, G; Barzi, E; Bourland, K; Brown, G; Casey, B C K; Chappa, S; Convery, M E; Drendel, B; Friedsam, H; Gadfort, T; Hardin, K; Hawke, S; Hayes, S; Jaskierny, W; Johnstone, C; Johnstone, J; Kashikhin, V; Kendziora, C; Kiburg, B; Klebaner, A; Kourbanis, I; Kyle, J; Larson, N; Leveling, A; Lyon, A L; Markley, D; McArthur, D; Merritt, K W; Mokhov, N; Morgan, J P; Nguyen, H; Ostiguy, J-F; Para, A; Popovic, C C Polly M; Ramberg, E; Rominsky, M; Schoo, D; Schultz, R; Still, D; Soha, A K; Strigonov, S; Tassotto, G; Turrioni, D; Villegas, E; Voirin, E; Velev, G; Wolff, D; Worel, C; Wu, J-Y; Zifko, R

2015-01-01T23:59:59.000Z

289

Muon Tracking to Detect Special Nuclear Materials  

SciTech Connect

Previous experiments have proven that nuclear assemblies can be imaged and identified inside of shipping containers using vertical trajectory cosmic-ray muons with two-sided imaging. These experiments have further demonstrated that nuclear assemblies can be identified by detecting fission products in coincidence with tracked muons. By developing these technologies, advanced sensors can be designed for a variety of warhead monitoring and detection applications. The focus of this project is to develop tomographic-mode imaging using near-horizontal trajectory muons in conjunction with secondary particle detectors. This will allow imaging in-situ without the need to relocate the objects and will enable differentiation of special nuclear material (SNM) from other high-Z materials.

Schwellenbach, D. [NSTec; Dreesen, W. [NSTec; Green, J. A. [NSTec; Tibbitts, A. [NSTec; Schotik, G. [NSTec; Borozdin, K. [LANL; Bacon, J. [LANL; Midera, H. [LANL; Milner, C. [LANL; Morris, C. [LANL; Perry, J. [LANL; Barrett, S. [UW; Perry, K. [UW; Scott, A. [UW; Wright, C. [UW; Aberle, D. [NSTec

2013-03-18T23:59:59.000Z

290

Muon Capture on the Proton and Deuteron  

E-Print Network (OSTI)

By measuring the lifetime of the negative muon in pure protium (hydrogen-1), the MuCap experiment determines the rate of muon capture on the proton, from which the proton's pseudoscalar coupling g_p may be inferred. A precision of 15% for g_p has been published; this is a step along the way to a goal of 7%. This coupling can be calculated precisely from heavy baryon chiral perturbation theory and therefore permits a test of QCD's chiral symmetry. Meanwhile, the MuSun experiment is in its final design stage; it will measure the rate of muon capture on the deuteron using a similar technique. This process can be related through pionless effective field theory and chiral perturbation theory to other two-nucleon reactions of astrophysical interest, including proton-proton fusion and deuteron breakup.

Frederick Gray

2008-08-11T23:59:59.000Z

291

Fermilab | Muon Collider | Reports and Papers  

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

Reports and Papers Reports and Papers Comprehensive Reports J. Gallardo, R. Palmer, A. Tollestrup, A. Sessler, A. Skrinsky et al., "μ+ μ- Collider: A Feasibility Study," DPF/DPB Summer Study on New Directions for High Energy Physics, Snow- mass, Colorado, 25 Jun - 12 Jul 1996, BNL - 52503, Fermilab - Conf - 96 - 092, LBNL - 38946, http://www.cap.bnl.gov/mumu/pubs/snowmass96.html C. Ankenbrandt et al.,"Status of muon collider research and development and future plans," Phys. Rev. ST Accel. Beams 2 (1999) 081001, http://prst-ab.aps.org/abstract/PRSTAB/v2/i8/e081001 M. M. Alsharo'a et al., "Recent progress in neutrino factory and muon collider research within the Muon Collaboration," Phys. Rev. ST Accel. Beams 6 (2003) 081001, http://prst-ab.aps.org/abstract/PRSTAB/v6/i8/e081001

292

Characterisation of the muon beams for the Muon Ionisation Cooling Experiment  

SciTech Connect

A novel single-particle technique to measure emittance has been developed and used to characterise seventeen different muon beams for the Muon Ionisation Cooling Experiment (MICE). The muon beams, whose mean momenta vary from 171 to 281 MeV/c, have emittances of approximately 1.5--2.3 \\pi mm-rad horizontally and 0.6--1.0 \\pi mm-rad vertically, a horizontal dispersion of 90--190 mm and momentum spreads of about 25 MeV/c. There is reasonable agreement between the measured parameters of the beams and the results of simulations. The beams are found to meet the requirements of MICE.

Adams, D.; et al.,

2013-10-01T23:59:59.000Z

293

Complete Muon Cooling Channel Design and Simulations  

SciTech Connect

Considerable progress has been made in developing promising subsystems for muon beam cooling channels to provide the extraordinary reduction of emittances required for an energy-frontier muon collider. However, it has not yet been demonstrated that the various proposed cooling subsystems can be consolidated into an integrated end-to-end design. Presented here are concepts to address the matching of transverse emittances between subsystems through an extension of the theoretical framework of the Helical Cooling Channel (HCC), which allows a general analytical approach to guide the transition from one set of cooling channel parameters to another.

C. Y. Yoshikawa, C.M. Ankenbrandt, R.P. Johnson, Y.S. Derbenev, V.S. Morozov, D.V. Neuffer, K. Yonehara

2012-07-01T23:59:59.000Z

294

Complete Muon Cooling Channel Design and Simulations  

SciTech Connect

Considerable progress has been made in developing promising subsystems for muon beam cooling channels to provide the extraordinary reduction of emittances required for an energy-frontier muon collider. However, it has not yet been demonstrated that the various proposed cooling subsystems can be consolidated into an integrated end-to-end design. Presented here are concepts to address the matching of transverse emittances between subsystems through an extension of the theoretical framework of the Helical Cooling Channel (HCC), which allows a general analytical approach to guide the transition from one set of cooling channel parameters to another.

Neuffer, D.V.; /Fermilab; Ankenbrandt, C.M.; Johnson, R.P.; Yoshikawa, C.Y.; /MUONS Inc., Batavia; Derbenev, Y.S.; Morozov, V.S.; /Jefferson Lab

2012-05-01T23:59:59.000Z

295

Muon-induced luminescence in KBr  

Science Journals Connector (OSTI)

The energy spectrum of the luminescence induced by positive muons stopped in KBr has been obtained. This spectrum shows a Gaussian line shape with the peak located at 2.82(2) eV [FWHM, 0.56(5) eV], which is shifted considerably from the 2.28-eV luminescence line due to the lowest triplet state of self-trapped excitons (STE’s). This result, together with the temperature dependences of its lifetime and yield, strongly suggests that the initial state of the observed luminescence is a triplet STE state that is specific to the muon(ium)-KBr system.

R. Kadono; A. Matsushita; K. Nishiyama; K. Nagamine

1992-10-01T23:59:59.000Z

296

Muon multiplicity at high energy proton-nuclei collisions  

E-Print Network (OSTI)

Estimation of multiplicity of muons and pions production at high energy proton-nuclei collisions is given. Both QED and QCD contributions are considered for peripheral kinematics of muon pair and $\\sigma$-meson production, keeping in mind it's final conversion to muons. An attempt to explain the excess of positive charged muons compared to negative one in cosmic muon showers is given. We derive the dependence of cross-section of $n$ pairs as a function of $n$ at large n as $d^n(n!n^2)^{-1}$.

E. A. Kuraev; S. Bakmaev; V. Bytev; E. Kokoulina

2007-06-29T23:59:59.000Z

297

First Observation of Accelerator Muon Antineutrinos in MINOS  

SciTech Connect

We report the first direct observation of muon antineutrinos in the MINOS Far Detector in the current muon-neutrino dominated beam. The magnetic field of the detector is utilized to separate muon neutrinos and antineutrinos event-by-event by identifying the charge sign of the muon created in charged-current interactions. We present preliminary results on the {bar {nu}}{sub {mu}} oscillation parameters as well as limit on the fraction of neutrinos that disappear and reappear as antineutrinos. We also discuss the prospect of the measurement when the polarity of the magnetic focusing horns will be reversed to create a dedicated muon antineutrino beam.

Danko, Istvan

2009-10-01T23:59:59.000Z

298

Alpha-muon sticking and chaos in muon-catalysed "in flight" d-t fusion  

E-Print Network (OSTI)

We discuss the alpha-muon sticking coefficient in the muon-catalysed ``in flight" d-t fusion in the framework of the Constrained Molecular Dynamics model. Especially the influence of muonic chaotic dynamics on the sticking coefficient is brought into focus. The chaotic motion of the muon affects not only the fusion cross section but also the $\\mu-\\alpha$ sticking coefficient. Chaotic systems lead to larger enhancements with respect to regular systems because of the reduction of the tunneling region. Moreover they give smaller sticking probabilities than those of regular events. By utilizing a characteristic of the chaotic dynamics one can avoid losing the muon in the $\\mu$CF cycle. We propose the application of the so-called ``microwave ionization of a Rydberg atom" to the present case which could lead to the enhancement of the reactivation process by using X-rays.

Sachie Kimura; Aldo Bonasera

2006-05-24T23:59:59.000Z

299

Low-energy muon [LEM] study of Zn-phthalocyanine and ZnO thin films  

Science Journals Connector (OSTI)

Implantation of low-energy muons in zinc-phthalocyanine (ZnPc) thin-films leads to the formation of muoniated radical states, the fast decaying of the ? SR signal at low fields being a clear indication of muonium formation. The formation probability of these paramagnetic states is independent of the implantation depth and amounts, as in the bulk, to approximately 100% of all muons. In these molecular crystals the formation of muonium is a highly local effect and is fairly independent of crystalline structure and defects in the sample. In contrast to that, in vapour-grown ZnO films the paramagnetic signal known from bulk experiments is not observed, even for the deeper implantations. We suggest that in this case muonium is not formed due to the low concentration of free electrons. In these strongly distorted films, electrons are captured at defects and are not available for muonium formation.

H.V. Alberto; J. Piroto Duarte; A. Weidinger; R.C. Vilão; J.M. Gil; N. Ayres de Campos; K. Fostiropoulos; T. Prokscha; A. Suter; E. Morenzoni

2009-01-01T23:59:59.000Z

300

Neutrinos from Decaying Muons, Pions, Kaons and Neutrons in Gamma Ray Bursts  

E-Print Network (OSTI)

In the internal shock model of gamma ray bursts ultrahigh energy muons, pions, neutrons and kaons are likely to be produced in the interactions of shock accelerated relativistic protons with low energy photons (KeV-MeV). These particles subsequently decay to high energy neutrinos/antineutrinos and other secondaries. In the high internal magnetic fields of gamma ray bursts, the ultrahigh energy charged particles ($\\mu^+$, $\\pi^+$, $K^+$) lose energy significantly due to synchrotron radiations before decaying into secondary high energy neutrinos and antineutrinos. The relativistic neutrons decay to high energy antineutrinos, protons and electrons. We have calculated the total neutrino flux (neutrino and antineutrino) considering the decay channels of ultrahigh energy muons, pions, neutrons and kaons. We have shown that the total neutrino flux generated in neutron decay can be higher than that produced in $\\mu^+$ and $\\pi^+$ decay. The charged kaons being heavier than pions, lose energy slowly and their secondary total neutrino flux is more than that from muons and pions at very high energy. Our detailed calculations on secondary particle production in $p\\gamma$ interactions give the total neutrino fluxes and their flavour ratios expected on earth. Depending on the values of the parameters (luminosity, Lorentz factor, variability time, spectral indices and break energy in the photon spectrum) of a gamma ray burst the contributions to the total neutrino flux from the decay of different particles (muon, pion, neutron and kaon) may vary and they would also be reflected on the neutrino flavour ratios.

Reetanjali Moharana; Nayantara Gupta

2012-05-27T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

NEUTRINO RADIATION CHALLENGES AND PROPOSED SOLUTIONS FOR MANY-TEV MUON COLLIDERS  

SciTech Connect

Neutrino radiation is expected to impose major design and siting constraints on many-TeV muon colliders. Previous predictions for radiation doses at TeV energy scales are briefly reviewed and then modified for extension to the many-TeV energy regime. The energy-cubed dependence of lower energy colliders is found to soften to an increase of slightly less than quadratic when averaged over the plane of the collider ring and slightly less than linear for the radiation hot spots downstream from straight sections in the collider ring. Despite this, the numerical values are judged to be sufficiently high that any many-TeV muon colliders will likely be constructed on large isolated sites specifically chosen to minimize or eliminate human exposure to the neutrino radiation. It is pointed out that such sites would be of an appropriate size scale to also house future proton-proton and electron-positron colliders at the high energy frontier, which naturally leads to conjecture on the possibilities for a new world laboratory for high energy physics. Radiation dose predictions are also presented for the speculative possibility of linear muon colliders. These have greatly reduced radiation constraints relative to circular muon colliders because radiation is only emitted in two pencil beams directed along the axes of the opposing linacs.

KING,B.J.

2000-05-05T23:59:59.000Z

302

Mitigating Radiation Impact on Superconducting Magnets of the Higgs Factory Muon Collider  

E-Print Network (OSTI)

Recent discovery of a Higgs boson boosted interest in a low-energy medium-luminosity Muon Collider as a Higgs Factory (HF). A preliminary design of the HF storage ring (SR) is based on cos-theta Nb3Sn superconducting (SC) magnets with the coil inner diameter ranging from 50 cm in the interaction region to 16 cm in the arc. The coil cross-sections were chosen based on the operation margin, field quality and quench protection considerations to provide an adequate space for the beam pipe, helium channel and inner absorber (liner). With the 62.5-GeV muon energy and 2 x 10^12 muons per bunch, the electrons from muon decays deposit about 300 kW in the SC magnets, or unprecedented 1 kW/m dynamic heat load, which corresponds to a multi-MW room temperature equivalent. Based on the detailed MARS15 model built and intense simulations, a sophisticated protection system was designed for the entire SR to bring the peak power density in the SC coils safely below the quench limit and reduce the dynamic heat load to the cold ...

Mokhov, Nikolai; Kashikhin, Vadim V; Striganov, Sergei I; Tropin, Igor S; Zlobin, Alexander V

2015-01-01T23:59:59.000Z

303

Observation of Muon Trident Production in Lead and the Statistics of the Muon  

Science Journals Connector (OSTI)

We have observed the production of muon tridents in lead with an effective cross section of 51 ± 7 nb per nucleus, in agreement with the predictions of quantum electrodynamics. This measurement is sufficiently accurate that the interference term due to the presence of two identical muons in the final state is seen. The size of the measured interference term is 1.15 ± 0.25 times the value predicted for Fermi statistics.

J. J. Russell; R. C. Sah; M. J. Tannenbaum; W. E. Cleland; D. G. Ryan; D. G. Stairs

1971-01-04T23:59:59.000Z

304

Calculation of two-centre two-electron integrals over Slater-type orbitals revisited. I. Coulomb and hybrid integrals  

E-Print Network (OSTI)

In this paper, which constitutes the first part of the series, we consider calculation of two-centre Coulomb and hybrid integrals over Slater-type orbitals (STOs). General formulae for these integrals are derived with no restrictions on the values of the quantum numbers and nonlinear parameters. Direct integration over the coordinates of one of the electrons leaves us with the set of overlap-like integrals which are evaluated by using two distinct methods. The first one is based on the transformation to the ellipsoidal coordinates system and the second utilises a recursive scheme for consecutive increase of the angular momenta in the integrand. In both methods simple one-dimensional numerical integrations are used in order to avoid severe digital erosion connected with the straightforward use of the alternative analytical formulae. It is discussed that the numerical integration does not introduce a large computational overhead since the integrands are well-behaved functions, calculated recursively with decent...

Lesiuk, Micha?

2014-01-01T23:59:59.000Z

305

Muon Collider Physics at Very High Energies  

E-Print Network (OSTI)

Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.

M. S. Berger

2000-01-03T23:59:59.000Z

306

Multi-muon events at CDF  

SciTech Connect

We report a study of multi-muon events produced at the Fermilab Tevatron collider and recorded by the CDF II detector. In a data set acquired with a dedicated dimuon trigger and corresponding to an integrated luminosity of 2100 pb{sup -1}, we isolate a significant sample of events in which at least one of the identified muons has large impact parameter and is produced outside the beam pipe of radius 1.5 cm. We are unable to fully account for the number and properties of the events through standard model processes in conjunction with our current understanding of the CDF II detector, trigger and event reconstruction. Several topological and kinematic properties of these events are also presented. In contrast, the production cross section and kinematics of events in which both muon candidates are produced inside the beam pipe are successfully modeled by known QCD processes which include heavy flavor production. The presence of these anomalous multi-muon events offers a plausible resolution to long-standing inconsistencies related to b{bar b} production and decay.

Ptochos, F.; /Cyprus U.

2009-07-01T23:59:59.000Z

307

Geophysical muon imaging: feasibility and limits  

Science Journals Connector (OSTI)

......Gaussian with mean N and standard deviation N. However...interval is obtained through standard procedure and we have...made very constructive reviews of a former version of...2010. Muon tomography: plans for observations in the...measurements with application in mining geophysics, Geophysics......

N. Lesparre; D. Gibert; J. Marteau; Y. Déclais; D. Carbone; E. Galichet

2010-12-01T23:59:59.000Z

308

Muon decay in a laser field  

Science Journals Connector (OSTI)

We investigate the change in the decay rate of a muon caused by embedding it in the field of a laser. A previous paper found that the change could be large, as much as an order of magnitude. We find the more intuitive result that the change is small and give analytic expressions for the small corrections.

Duane A. Dicus; Arsham Farzinnia; Wayne W. Repko; Todd M. Tinsley

2009-01-12T23:59:59.000Z

309

The Weak Interactions of the Muon  

Science Journals Connector (OSTI)

20 April 1965 research-article The Weak Interactions of the Muon R. H. Dalitz The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access to Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences. www.jstor.org

1965-01-01T23:59:59.000Z

310

Muon Collider Machine-Detector Interface  

SciTech Connect

In order to realize the high physics potential of a Muon Collider (MC) a high luminosity of {mu}{sup +}{mu}{sup -}-collisions at the Interaction Point (IP) in the TeV range must be achieved ({approx}10{sup 34} cm{sup -2}s{sup -1}). To reach this goal, a number of demanding requirements on the collider optics and the IR hardware - arising from the short muon lifetime and from relatively large values of the transverse emittance and momentum spread in muon beams that can realistically be obtained with ionization cooling should be satisfied. These requirements are aggravated by limitations on the quadrupole gradients as well as by the necessity to protect superconducting magnets and collider detectors from muon decay products. The overall detector performance in this domain is strongly dependent on the background particle rates in various sub-detectors. The deleterious effects of the background and radiation environment produced by the beam in the ring are very important issues in the Interaction Region (IR), detector and Machine-Detector Interface (MDI) designs. This report is based on studies presented very recently.

Mokhov, Nikolai V.; /Fermilab

2011-08-01T23:59:59.000Z

311

Multi-muon events at CDF  

E-Print Network (OSTI)

We report a study of multi-muon events produced at the Fermilab Tevatron collider and recorded by the CDF II detector. In a data set acquired with a dedicated dimuon trigger and corresponding to an integrated luminosity of 2100 pb$^{-1}$, we isolate a significant sample of events in which at least one of the identified muons has large impact parameter and is produced outside the beam pipe of radius 1.5 cm. We are unable to fully account for the number and properties of the events through standard model processes in conjunction with our current understanding of the CDF II detector, trigger and event reconstruction. Several topological and kinematic properties of these events are also presented. In contrast, the production cross section and kinematics of events in which both muon candidates are produced inside the beam pipe are successfully modeled by known QCD processes which include heavy flavor production. The presence of these anomalous multi-muon events offers a plausible resolution to long-standing inconsistencies related to $b\\bar{b}$ production and decay.

F. Ptochos

2009-07-01T23:59:59.000Z

312

Atmospheric muon background in the ANTARES detector  

E-Print Network (OSTI)

An evaluation of the background due to atmospheric muons in the ANTARES high energy neutrino telescope is presented. Two different codes for atmospheric shower simulation have been used. Results from comparisons between these codes at sea level and detector level are presented. The first results on the capability of ANTARES to reject this class of background are given.

S. Cecchini; E. Korolkova; A. Margiotta; L. Thompson

2005-10-28T23:59:59.000Z

313

Measurement of electron neutrino CCQE-like cross-section in MINERvA  

E-Print Network (OSTI)

The electron-neutrino charged-current quasi-elastic (CCQE) cross-section on nuclei is an important input parameter to appearance-type neutrino oscillation experiments. Current experiments typically work from the muon neutrino cross-section and apply corrections from theoretical arguments to obtain a prediction for the electron neutrino cross-section, but to date there has been no experimental verification of the estimates for this channel at an energy scale appropriate to such experiments. We present a preliminary result from the MINERvA experiment on the first measurement of an exclusive reaction in few-GeV electron neutrino interactions, namely, the cross-section for a CCQE-like process. The result is given both as differential cross-sections vs. the electron energy, electron angle, and $Q^{2}$, as well as a total cross-section vs. neutrino energy.

Wolcott, Jeremy

2015-01-01T23:59:59.000Z

314

nuSTORM - Neutrinos from STORed Muons: Letter of Intent to the Fermilab Physics Advisory Committee  

SciTech Connect

The idea of using a muon storage ring to produce a high-energy ({approx_equal} 50 GeV) neutrino beam for experiments was first discussed by Koshkarev in 1974. A detailed description of a muon storage ring for neutrino oscillation experiments was first produced by Neuffer in 1980. In his paper, Neuffer studied muon decay rings with E{sub {mu}} of 8, 4.5 and 1.5 GeV. With his 4.5 GeV ring design, he achieved a figure of merit of {approx_equal} 6 x 10{sup 9} useful neutrinos per 3 x 10{sup 13} protons on target. The facility we describe here ({nu}STORM) is essentially the same facility proposed in 1980 and would utilize a 3-4 GeV/c muon storage ring to study eV-scale oscillation physics and, in addition, could add significantly to our understanding of {nu}{sub e} and {nu}{sub {mu}} cross sections. In particular the facility can: (1) address the large {Delta}m{sup 2} oscillation regime and make a major contribution to the study of sterile neutrinos, (2) make precision {nu}{sub e} and {bar {nu}}{sub e} cross-section measurements, (3) provide a technology ({mu} decay ring) test demonstration and {mu} beam diagnostics test bed, and (4) provide a precisely understood {nu} beam for detector studies. The facility is the simplest implementation of the Neutrino Factory concept. In our case, 60 GeV/c protons are used to produce pions off a conventional solid target. The pions are collected with a focusing device (horn or lithium lens) and are then transported to, and injected into, a storage ring. The pions that decay in the first straight of the ring can yield a muon that is captured in the ring. The circulating muons then subsequently decay into electrons and neutrinos. We are starting with a storage ring design that is optimized for 3.8 GeV/c muon momentum. This momentum was selected to maximize the physics reach for both oscillation and the cross section physics. See Fig. 1 for a schematic of the facility.

Kyberd, P.; Smith, D.R.; /Brunel U.; Coney, L.; /UC, Riverside; Pascoli, S.; /Durham U., IPPP; Ankenbrandt, C.; Brice, S.J.; Bross, A.D.; Cease, H.; Kopp, J.; Mokhov, N.; Morfin, J.; /Fermilab /Yerkes Observ. /Glasgow U. /Imperial Coll., London /Valencia U. /Jefferson Lab /Kyoto U. /Northwestern U. /Osaka U.

2012-06-01T23:59:59.000Z

315

Muon energy reconstruction in the ANTARES detector  

Science Journals Connector (OSTI)

The energy reconstruction of both neutrino-induced muons from neutrino interactions in the vicinity of the detector and of muons from cosmic ray air showers contributes indispensable information for a broad range of physics analyses, e.g. by increasing the sensitivity in neutrino point source searches or in offering access to observables such as the atmospheric neutrino spectrum. Currently, four energy reconstruction methods are implemented in the ANTARES data analysis framework, ranging from estimates based on photon counting and the total charge deposited in the detector to methods based on probability density functions and Artificial Neural Networks. These four methods, their performance and systematic studies of the energy resolution capabilities of the ANTARES detector are presented.

Jutta Schnabel

2013-01-01T23:59:59.000Z

316

An update of muon capture on hydrogen  

E-Print Network (OSTI)

The successful precision measurement of the rate of muon capture on a proton by the MuCap Collaboration allows for a stringent test of the current theoretical understanding of this process. Chiral perturbation theory, which is a low-energy effective field theory that preserves the symmetries and the pattern of symmetry breaking in the underlying theory of QCD, offers a systematic framework for describing $\\mu p$ capture and provides a basic test of QCD at the hadronic level. We describe how this effective theory with no free parameters reproduces the measured capture rate. A recent study has addressed new sources of uncertainties that were not considered in the previous works, and we review to what extent these uncertainties are now under control. Finally, the rationale for studying muon capture on the deuteron and some recent theoretical developments regarding this process are discussed.

S. Pastore; F. Myhrer; K. Kubodera

2014-05-06T23:59:59.000Z

317

Photonuclear Interactions of High-Energy Muons  

Science Journals Connector (OSTI)

A calculation of the photonuclear energy-loss coefficient bn is made by extrapolating recent SLAC inelastic muon scattering data to the 1012-eV energy region. Previous methods of calculation are discussed, and attention is drawn to the q2 dependence of the inelastic cross section. It is also noted that bn should be A dependent. This is predicted from vector dominance and indicated by the SLAC data on photoproduction off complex nuclei. The value of bn obtained is 0.21×10-6 g-1 cm2. The relationship of bn to observed cosmic-ray muon intensities is discussed, along with the implications of higher bn values than are predicted here.

G. L. Cassiday

1971-03-01T23:59:59.000Z

318

Muon RLA - design status and simulations  

SciTech Connect

The Neutrino Factory baseline design involves a complex chain of accelerators beginning with a linac. This first pre-linac follows the capture and bunching section and accelerates the muons from about 244 to 900 MeV and must accept a high emittance beam about 30 cm wide with a 10% energy spread. It uses counterwound, shielded superconducting solenoids and 201 MHz superconducting cavities, and currently consists of 24 3 m and 24 5 m long cryomodules. The next stage is a 1st dogbone-shaped RLA that takes the total energy from 900 MeV to 3.6 GeV in 4.5 passes, followed by a 2nd RLA that takes the energy from 3.6 to 12.6 GeV in 4.5 passes. Simulations are in progress to optimize the optics and determine the radiation loads from beam loss and muon decay.

Beard, Kevin B. [Muons, Inc., Batavia, IL (United States); Bogacz, Slawomir A. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Morozov, Vasiliy S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Roblin, Yves R. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

2013-02-01T23:59:59.000Z

319

Tests of a calorimetric technique for measuring the energy of cosmic ray muons in the TeV energy range  

Science Journals Connector (OSTI)

Previous energy measurements of cosmic ray muons have used magnetic spectrometers to measure the momentum of muons. Measurements using magnets fail for muons in the TeV range because at ultra-high muon energies, ...

A. P. Chikkatur; L. Bugel; A. Alton…

1997-06-01T23:59:59.000Z

320

A Multi-MW Proton/Electron Linac at KEK  

E-Print Network (OSTI)

It is proposed that a multi-MW superconducting proton/electron linac (SCL) and a proton injector (PI) be built at KEK. The 3 GeV PI would serve both as an injector to the SCL and a source of proton beams that could be used to copiously produce neutrons and muons. Protons accelerated by the SCL to 20 GeV would be transferred through the KEK Tristan ring in order to create neutrino, kaon and muon beams for fixed-target experiments. At a later stage, a 60 GeV proton synchrotron could be installed inside the Tristan ring. The SCL, comprising 1.3 GHZ superconducting ILC-type rf cavities, could also accelerate polarized or unpolarized electron beams. After acceleration, electrons may traverse an XFEL undulator, or could be used to produce polarized positrons. An SCL-based synchrotron light source for applications in materials science and medicine is also envisaged. The proposed facility would be constructed using the existing KEK accelerator infrastructure.

Belusevic, Radoje

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Comparison of crystal growth and thermoelectric properties of n-type Bi-Se-Te and p-type Bi-Sb-Te nanocrystalline thin films: Effects of homogeneous irradiation with an electron beam  

SciTech Connect

The effects of homogenous electron beam (EB) irradiation on the crystal growth and thermoelectric properties of n-type Bi-Se-Te and p-type Bi-Sb-Te thin films were investigated. Both types of thin films were prepared by flash evaporation, after which homogeneous EB irradiation was performed at an acceleration voltage of 0.17?MeV. For the n-type thin films, nanodots with a diameter of less than 10?nm were observed on the surface of rice-like nanostructures, and crystallization and crystal orientation were improved by EB irradiation. The resulting enhancement of mobility led to increased electrical conductivity and thermoelectric power factor for the n-type thin films. In contrast, the crystallization and crystal orientation of the p-type thin films were not influenced by EB irradiation. The carrier concentration increased and mobility decreased with increased EB irradiation dose, possibly because of the generation of defects. As a result, the thermoelectric power factor of p-type thin films was not improved by EB irradiation. The different crystallization behavior of the n-type and p-type thin films is attributed to atomic rearrangement during EB irradiation. Selenium in the n-type thin films is more likely to undergo atomic rearrangement than the other atoms present, so only the crystallinity of the n-type Bi-Se-Te thin films was enhanced.

Takashiri, Masayuki, E-mail: takashiri@tokai-u.jp; Imai, Kazuo; Uyama, Masato; Nishi, Yoshitake [Department of Materials Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 (Japan); Hagino, Harutoshi; Miyazaki, Koji [Department of Mechanical and Control Engineering, Kyushu Institute of Technology, 1-1 Sensui, Tobata-ku, Kitakyushu 804-8550 (Japan); Tanaka, Saburo [Department of Mechanical Engineering, College of Engineering, Nihon University, Nakagawara, Tokusada, Tamuramachi, Koriyama, Fukushima 963-8642 (Japan)

2014-06-07T23:59:59.000Z

322

Recent results from COMPASS muon scattering measurements  

SciTech Connect

A sample of recent results in muon scattering measurements from the COMPASS experiment at CERN will be reviewed. These include high energy processes with longitudinally polarised proton and deuteron targets. High energy polarised measurements provide important constraints for studying the nucleon spin structure and thus permit to test the applicability of the theoretical framework of factorisation theorems and perturbative QCD. Specifically, latest results on longitudinal quark polarisation, quark helicity densities and gluon polarisation will be reviewed.

Capozza, Luigi [Irfu/SPhN - CEA Saclay, 91190 Gif-sur-Yvette (France); Collaboration: COMPASS Collaboration

2012-10-23T23:59:59.000Z

323

High-energy cosmic-ray muons at ground level and below ground level  

Science Journals Connector (OSTI)

Cosmic-ray muon interactions have been studied in an analysis of very recent measurements of cosmic-ray muons at sea-level and large depths underground ... By starting with the very carefully measured vertical muon

C. R. Paul; N. Chaudhuri

1977-01-11T23:59:59.000Z

324

Study of High pT Muons in IceCube  

E-Print Network (OSTI)

be determined from the muon energy (measured by dE/dx) andthe incident nucleon. The muon energy and p T can be relatedshowers. Most of the high-energy muons that are visible in

Gerhardt, Lisa; IceCube Collaboration

2009-01-01T23:59:59.000Z

325

Sensitivity of the icecube detector to astrophysical sources of high energy muon neutrinos  

E-Print Network (OSTI)

as a function of muon energy and angle of incidence. WeKopp and Voss [38] (for muon energies smaller than 10 5.5and Stanev [33] (for muon energies greater than 10 5.5 GeV).

2004-01-01T23:59:59.000Z

326

STUDY OF RARE PROCESSES INDUCED BY 209-GeV MUONS  

E-Print Network (OSTI)

^ for the effect of muon energy loss in each magnet segment.virtual photon and beam muon energy- loss v. f = l°g (Pj. )o n of the laboratory muon energy re- N and considering only

Smith, W.H.

2010-01-01T23:59:59.000Z

327

Nuclear Interaction of Very High Energy Muons at Large Momentum Transfer  

Science Journals Connector (OSTI)

......Nuclear Interaction of Very High Energy Muons at Large Momentum Transfer Kimio...nuclear interaction of very high energy muons with large energy transfers of...Nuclear Interaction of Very High Energy Muons at Large Mlomentum Transfer Kimio......

Kimio Fujimura

1965-07-01T23:59:59.000Z

328

Studying High pT muons in Cosmic-Ray Air Showers  

E-Print Network (OSTI)

threshold is about 500 GeV Muon energy, E µ is measured byabout 30 m [6]. With the muon energy and distance from the7]. 3) Uncertainty in the muon energy and posi- tion, due to

Klein, Spencer R.

2006-01-01T23:59:59.000Z

329

Distribution of Four-Momentum Transfer in Multiple Meson Productions by High Energy Muons  

Science Journals Connector (OSTI)

......Multiple Meson Productions by High Energy Muons S. Higashi T. Kitamura Y. Mishima...Multiple Meson Productions by High Energy Muons S. Higashi, T. Kitamura, Y...production. Provided that the high energy muon-nucleon inter- actions occur......

S. Higashi; T. Kitamura; Y. Mishima; S. Miyamoto; H. Shibata; Y. Watase; K. Daiyasu; K. Kobayakawa; T. Murota; T. Nakano

1964-01-01T23:59:59.000Z

330

Search for muon neutrinos from Gamma-Ray Bursts with the IceCube neutrino telescope  

E-Print Network (OSTI)

of California. Search for muon neutrinos from Gamma-RaySearch for muon neutrinos from Gamma-Ray Bursts with theof searches for high-energy muon neutrinos from 41 gamma-

Abbasi, R.

2010-01-01T23:59:59.000Z

331

Muon-Induced Backgrounds in Double Chooz Emily Conover  

E-Print Network (OSTI)

to scintillator 8 MeV n capture energy, 30µs backgrounds due to muons remain E¯e = Ee+ + 10-40keV En + 1.8MeMuon-Induced Backgrounds in Double Chooz Emily Conover University of Chicago Second Thesis and Stopped Muons 9Li and 8He 3. Double Chooz Results 4. Conclusions Timeline/Future work Emily Conover (Univ

332

MUON STORAGE RINGS FOR 6D PHASE SPACE COOLING.  

SciTech Connect

We describe several storage ring designs for reducing the 6-dimensional phase space of circulating muon beams. These rings utilize quadrupole and dipole magnets as well as wedge-shaped, liquid-hydrogen, energy-loss absorbers and energy compensating rf cavities. We obtain evaluations of their cooling performance by particle tracking simulation. Such rings are potentially useful for future Neutrino Factories or Muon Colliders as well as for existing facilities in which cooled, intense muon beams could enhance their physics programs.

KIRK,H.CLINE,D.FUKUI,Y.GARREN,A.

2003-05-12T23:59:59.000Z

333

Improvement of windowed type environmental-cell transmission electron microscope for in situ observation of gas-solid interactions  

SciTech Connect

We have developed an improved, windowed type environmental-cell (E-cell) transmission electron microscope (TEM) for in situ observation of gas-solid interactions, such as catalytic reactions at atmospheric pressure. Our E-cell TEM includes a compact E-cell specimen holder with mechanical stability, resulting in smoother introduction of the desired gases compared with previous E-cell TEMs. In addition, the gas control unit was simplified by omitting the pressure control function of the TEM pre-evacuation chamber. This simplification was due to the successful development of remarkably tough thin carbon films as the window material. These films, with a thickness of <10 nm, were found to withstand pressure differences >2 atm. Appropriate arrangement of the specimen position inside the E-cell provided quantitatively analyzable TEM images, with no disturbances caused by the windowed films. As an application, we used this E-cell TEM to observe the dynamic shape change in a catalytic gold nanoparticle supported on TiO{sub 2} during the oxidation of CO gas.

Kawasaki, Tadahiro [Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603 (Japan); PRESTO-JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan); Ueda, Kouta [Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603 (Japan); Ichihashi, Mikio; Tanji, Takayoshi [EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 (Japan)

2009-11-15T23:59:59.000Z

334

Muon Beam Helical Cooling Channel Design  

SciTech Connect

The Helical Cooling Channel (HCC) achieves effective ionization cooling of the six-dimensional (6d) phase space of a muon beam by means of a series of 21st century inventions. In the HCC, hydrogen-pressurized RF cavities enable high RF gradients in strong external magnetic fields. The theory of the HCC, which requires a magnetic field with solenoid, helical dipole, and helical quadrupole components, demonstrates that dispersion in the gaseous hydrogen energy absorber provides effective emittance exchange to enable longitudinal ionization cooling. The 10-year development of a practical implementation of a muon-beam cooling device has involved a series of technical innovations and experiments that imply that an HCC of less than 300 m length can cool the 6d emittance of a muon beam by six orders of magnitude. We describe the design and construction plans for a prototype HCC module based on oxygen-doped hydrogen-pressurized RF cavities that are loaded with dielectric, fed by magnetrons, and operate in a superconducting helical solenoid magnet.

Johnson, Rolland; Ankenbrandt, Charles; Flanagan, G.; Kazakevich, G.M.; Marhauser, Frank; Neubauer, Michael; Roberts, T.; Yoshikawa, C.; Derbenev, Yaroslav; Morozov, Vasiliy; Kashikhin, V.S.; Lopes, Mattlock; Tollestrup, A.; Yonehara, Katsuya; Zloblin, A.

2013-06-01T23:59:59.000Z

335

Tests of CPT and Lorentz symmetry from muon anomalous magnetic dipole moment  

E-Print Network (OSTI)

We derive the relativistic factor for splitting of the $g$-factors of a fermion and its anti-fermion partner, which is important for placing constraints on dimension-5, $CPT$-odd and Lorentz-invariance-violating interactions from experiments performed in a cyclotron. From existing data, we extract limits (1$\\sigma$) on the coupling strengths of the temporal component, $f^0$, of a background field (including the field amplitude), which is responsible for such $g$-factor splitting, with an electron, proton, and muon: $|f^0_e|muon: $| {d}_e^{\\perp} | \\lesssim 10^{-9} ~\\mu_{\\textrm{B}}$, $| {d}_p^{\\perp} | \\lesssim 10^{-9} ~\\mu_{\\textrm{B}}$, $| {d}_n^{\\perp} | \\lesssim 10^{-10} ~\\mu_{\\textrm{B}}$, and $| {d}_\\mu^{\\perp} | \\lesssim 10^{-9} ~\\mu_{\\textrm{B}}$, respectively, in the laboratory frame.

Y. V. Stadnik; B. M. Roberts; V. V. Flambaum

2014-07-22T23:59:59.000Z

336

Energy calibration of large underwater detectors using stopping muons  

E-Print Network (OSTI)

We propose to use stopping cosmic-ray muons in the energy calibration of planned and deployed large underwater detectors. The method is based on the proportionality between the incident muon energy and the length of the muon path before it stops. Simultaneous measurements of the muon path and the amplitude of the signal from the photomultiplier tubes allow a relation between the energy deposited in the sensitive volume of the detector and the observed signal to be derived, and also provide a test of detector simulations. We describe the proposed method and present the results of simulations.

V. A. Kudryavtsev; R. A. Brook; S. L. Cartwright; J. E. McMillan; N. J. C. Spooner; L. F. Thompson

2000-10-21T23:59:59.000Z

337

Muons and Neutrinos at High-Energy Accelerators  

Science Journals Connector (OSTI)

Background levels in detectors and radiation problems at future colliders — whether pp, e + e - or ?+ ?- are in large part determined by the presence of muons. Neutrinos ...

N. Mokhov; S. Striganov; A. Van Ginneken

2001-01-01T23:59:59.000Z

338

Energy calibration of large underwater detectors using stopping muons  

Science Journals Connector (OSTI)

We propose to use stopping cosmic-ray muons in the energy calibration of planned and deployed large underwater detectors. The method is based on the proportionality between the incident muon energy and the length of the muon path before it stops. Simultaneous measurements of the muon path and the amplitude of the signal from the photomultiplier tubes allow a relation between the energy deposited in the sensitive volume of the detector and the observed signal to be derived, and also provide a test of detector simulations. We describe the proposed method and present the results of simulations.

V.A. Kudryavtsev; R.A. Brook; S.L. Cartwright; J.E. McMillan; N.J.C. Spooner; L.F. Thompson

2000-01-01T23:59:59.000Z

339

On muons of energy ?150 Gev in association with EAS  

Science Journals Connector (OSTI)

Preliminary results of an investigation on energetic penetrating particles (muons) of energy ?150 Gev are reported. These particles...4–105 particles.

B. Chowdhury; Y. C. Saxena

1971-02-01T23:59:59.000Z

340

Time correlations of high energy muons in an underground detector  

E-Print Network (OSTI)

We present the result of a search for correlations in the arrival times of high energy muons collected from 1995 till 2000 with the streamer tube system of the complete MACRO detector at the underground Gran Sasso Lab. Large samples of single muons (8.6 million), double muons (0.46 million) and multiple muons with multiplicities from 3 to 6 (0.08 million) were selected. These samples were used to search for time correlations of cosmic ray particles coming from the whole upper hemisphere or from selected space cones. The results of our analyses confirm with high statistics a random arrival time distribution of high energy cosmic rays.

Y. Becherini; S. Cecchini; T. Chiarusi; M. Cozzi; H. Dekhissi; J. Derkaoui; L. S. Esposito; G. Giacomelli; M. Giorgini; N. Giglietto; F. Maaroufi; G. Mandrioli; A. Margiotta; S. Manzoor; A. Moussa; L. Patrizii; V. Popa; M. Sioli; G. Sirri; M. Spurio; V. Togo

2005-02-12T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Local Fermi gas in inclusive muon capture from nuclei  

E-Print Network (OSTI)

We compare local Fermi gas and shell model in muon capture in nuclei in order to estimate the effect of finite nuclear size in low energy weak reactions.

J. E. Amaro; J. Nieves; M. Valverde; C. Maieron

2006-05-20T23:59:59.000Z

342

Toroidal magnetic detector for high resolution measurement of muon momenta  

DOE Patents (OSTI)

A muon detector system including central and end air-core superconducting toroids and muon detectors enclosing a central calorimeter/detector. Muon detectors are positioned outside of toroids and all muon trajectory measurements are made in a nonmagnetic environment. Internal support for each magnet structure is provided by sheets, located at frequent and regularly spaced azimuthal planes, which interconnect the structural walls of the toroidal magnets. In a preferred embodiment, the shape of the toroidal magnet volume is adjusted to provide constant resolution over a wide range of rapidity. 4 figs.

Bonanos, P.

1992-01-07T23:59:59.000Z

343

The performance of the MICE muon beam line  

SciTech Connect

The Muon Ionization Cooling Experiment is one lattice cell of a cooling channel suitable for conditioning the muon beam at the front end of a Neutrino Factory or Muon Collider. The beam line designed to transport muons into MICE has been installed, and data was collected in 2010. In this paper the method of reconstructing longitudinal momentum and transverse trace space using two timing detectors is discussed, and a preliminary simulation of the performance of a measured beam in the cooling channel is presented.

Rayner, Mark Alastair [University of Oxford (United Kingdom)

2011-10-06T23:59:59.000Z

344

Toroidal magnetic detector for high resolution measurement of muon momenta  

DOE Patents (OSTI)

A muon detector system including central and end air-core superconducting toroids and muon detectors enclosing a central calorimeter/detector. Muon detectors are positioned outside of toroids and all muon trajectory measurements are made in a nonmagnetic environment. Internal support for each magnet structure is provided by sheets, located at frequent and regularly spaced azimuthal planes, which interconnect the structural walls of the toroidal magnets. In a preferred embodiment, the shape of the toroidal magnet volume is adjusted to provide constant resolution over a wide range of rapidity.

Bonanos, Peter (East Brunswick, NJ)

1992-01-01T23:59:59.000Z

345

Muon Spin Relaxation Study of the Spin Transition Compound [Fe(Phen)2(NCS)2  

Science Journals Connector (OSTI)

The muons enter the sample with their polarization antiparallel to the beam direction, chosen as the z direction, and decay with a mean lifetime of 2.2 ?s, emitting positrons preferentially along the muon spin direction that are detected by scintillation detectors which surround the sample. ... In these expts., implanted muons were used to study the magnitude, distribution and dynamics of the local field at the muon site. ... (11)?Muon Science:? Muons in Physics, Chemistry and Solids. ...

Y. Garcia; V. Ksenofontov; S. J. Campbell; J. S. Lord; Y. Boland; P. Gütlich

2004-10-22T23:59:59.000Z

346

Muon–alpha-particle sticking probability in muon-catalyzed fusion  

Science Journals Connector (OSTI)

The Green’s-function Monte Carlo method is used to calculate the ground-state wave function of the muonic-molecular ion composed of a negative muon bound to a deuteron and a triton. Using the sudden approximation, the probability that the muon will remain bound to the escaping alpha particle after fusion occurs is found to be 0.90%, about 25% smaller than previous estimates based on the Born-Oppenheimer approximation. The numerical method for determining the wave function is discussed in detail.

D. Ceperley and B. J. Alder

1985-04-01T23:59:59.000Z

347

Possible role of coronal streamer as magnetically-closed structure in shock-induced energetic electrons and metric type II radio bursts  

E-Print Network (OSTI)

Two solar type II radio bursts, separated by ~24 hours in time, are examined together. Both events are associated with coronal mass ejections (CMEs) erupting from the same active region (NOAA 11176) beneath a well-observed helmet streamer. We find that the type II emissions in both events ended once the CME/shock fronts passed the white-light streamer tip, which is presumably the magnetic cusp of the streamer. This leads us to conjecture that the closed magnetic arcades of the streamer may play a role in electron acceleration and type II excitation at coronal shocks. To examine such a conjecture, we conduct a test-particle simulation for electron dynamics within a large-scale partially-closed streamer magnetic configuration swept by a coronal shock. We find that the closed field lines play the role of an electron trap, via which the electrons are sent back to the shock front for multiple times, and therefore accelerated to high energies by the shock. Electrons with an initial energy of 300eV can be accelerate...

Kong, Xiangliang; Guo, Fan; Feng, Shiwei; Wang, Bing; Du, Guohui; Li, Gang

2014-01-01T23:59:59.000Z

348

E-Print Network 3.0 - altitude muons deconvolved Sample Search...  

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

Search Powered by Explorit Topic List Advanced Search Sample search results for: altitude muons deconvolved Page: << < 1 2 3 4 5 > >> 1 Muon pair production by photons in...

349

E-Print Network 3.0 - atlas muon endcap Sample Search Results  

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

First Result of Global Commissioning of the ATALS Endcap Muon Trigger System in ATLAS Cavern Summary: The First Result of Global Commissioning of the ATALS Endcap Muon Trigger...

350

E-Print Network 3.0 - atlas 1st-level muon Sample Search Results  

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

First Result of Global Commissioning of the ATALS Endcap Muon Trigger System in ATLAS Cavern Summary: The First Result of Global Commissioning of the ATALS Endcap Muon Trigger...

351

E-Print Network 3.0 - atlas high-level muon Sample Search Results  

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

Pontecorvo, Installation and Commissioning of the ATLAS MUON... recorded in the ATLAS cavern with two muon ... Source: Ecole Polytechnique, Centre de mathmatiques Collection:...

352

E-Print Network 3.0 - atlas mdt muon Sample Search Results  

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

First Result of Global Commissioning of the ATALS Endcap Muon Trigger System in ATLAS Cavern Summary: The First Result of Global Commissioning of the ATALS Endcap Muon Trigger...

353

The cosmic muon flux in the ATLAS Detector at the Large Hadron Collider.  

E-Print Network (OSTI)

??Many ATLAS analyses study events with muons in them including those searching for the Higgs boson and new physics. Cosmics muons, however, can also occasionally… (more)

Hill, Ewan Chin

2011-01-01T23:59:59.000Z

354

E-Print Network 3.0 - avec des muons Sample Search Results  

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

Mathematics 66 Implementation and Performance of the Event Filter Muon Selection for the ATLAS experiment at LHC Summary: Implementation and Performance of the Event Filter Muon...

355

Nuclear excitation energy in muon capture: A reply  

Science Journals Connector (OSTI)

The parametrization of total muon capture rates in terms of a mean nuclear excitation energy E¯?, recently proposed by Christillin, Dellafiore, and Rosa-Clot, is reexamined in view of recent criticisms. The previously obtained results are reconfirmed.NUCLEAR REACTIONS ?-+A(N, Z)??+A(N+1, Z-1); muon capture; closure approximation; mean nuclear excitation energies.

P. Christillin, A. Dellafiore, and M. Rosa-Clot

1975-08-01T23:59:59.000Z

356

Detectors for Neutrino Physics at the First Muon Collider  

E-Print Network (OSTI)

We consider possible detector designs for short-baseline neutrino experiments using neutrino beams produced at the First Muon Collider complex. The high fluxes available at the muon collider make possible high statistics deep-inelastic scattering neutrino experiments with a low-mass target. A design of a low-energy neutrino oscillation experiment on the ``tabletop'' scale is also discussed.

Deborah A. Harris; Kevin S. McFarland

1998-04-20T23:59:59.000Z

357

Muon Spin Relaxation Studies on High-Tc Superconductors  

Science Journals Connector (OSTI)

The AGS proton synchrotron at Brookhaven National Laboratory facilitates a medium-intensity polarized muon channel. Muon spin relaxation (?SR) experiments on single...1.85Sr0.15)CuO4 and YBa2Cu3O7...have been car...

W. J. Kossler; J. R. Kempton; A. Moodenbaugh; D. Opie; H. Schone…

1987-01-01T23:59:59.000Z

358

MODELING THE MUON COOLING CHANNEL USING MOMENTS B. A. Shadwick  

E-Print Network (OSTI)

to reach the luminosity goals demanded by high- energy physics applications [3]. Furthermore, this cooling Using a moment formalism [1, 2] we model beam trans- port in the muon collider cooling channel. This model con- tains much of the physics we believe to be relevant to muon cooling such as ionization energy

Wurtele, Jonathan

359

PHYSICS AT HIGH LUMINOSITY MUON COLLIDERS AND A FACILITY OVERVIEW.  

SciTech Connect

Physics potentials at future colliders including high luminosity {mu}{sup +}{mu}{sup -} colliders are discussed. Luminosity requirement, estimates for Muon collider energies of interest (0.1 TeV to 100 TeV) are calculated. Schematics and an overview of Muon Collider facility concept are also included.

PARSA,Z.

2001-07-01T23:59:59.000Z

360

Performance of Muon-Based Triggers at the CMS High Level Trigger  

E-Print Network (OSTI)

The trigger systems of the CERN LHC detectors play a crucial role in determining the physics capabilities of the experiments. A reduction of several orders of magnitude of the event rate is needed to reach values compatible with the detector readout, offline storage and analysis capabilities. The CMS experiment has been designed with a two-level trigger system: the Level 1 (L1) Trigger, implemented on custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the CMS reconstruction and analysis software running on a computer farm. Here we will present the design and performance of the main muon triggers used during the Run I data taking. We will show how these triggers contributed to the 2012 physics results. We will then present the improvements foreseen to meet the challenges of the Run II data taking. We will discuss the improvements being made at L1, and at various stages in the HLT reconstruction, ranging from the local drift tube and cathode strip chamber reconstruction, to L2 muon tracks, to the final L3 muons.

Juliette Alimena

2014-09-17T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Use of proportional tubes in a muon polarimeter  

SciTech Connect

A prototype muon polarimeter was built to study the feasibility of measuring the positive muon polarization in the decay K/sub L/ ..-->.. ..mu../sup +/..mu../sup /minus//. The system consisted of alternating layers of extruded aluminum gas proportional tubes and polarization-retaining absorber plates of either aluminum or marble. Longitudinally polarized positive muons from the Stopped Muon Channel at the Clinton P. Anderson Meson Physics Facility (LAMPF) were stopped in the absorber plates where they precessed in a field of 60 gauss. Decay times were recorded in 100 ns first-in-first-out memories for all wires hit during a 12.8 ..mu..s period centered about the muon stop trigger. The performance of the system was studied for different beam rates and absorber thicknesses. The value of imposing time and spacial cuts on track data to enhance the precession signal was also investigated. 7 refs., 4 figs., 1 tab.

Kenney, C.J.; Eckhause, M.; Ginkel, J.F.; Guss, P.P.; Kane, J.R.; Vulcan, W.F.; Welsh, R.E.; Whyley, R.J.; Bilskie, J.; Hart, G.W.

1988-01-01T23:59:59.000Z

362

Frictional Cooling Scheme for Use in a Muon Collider  

SciTech Connect

The Muon Group at the MPI for Physics, Munich is investigating frictional cooling as a fast muon-beam emittance reduction scheme for a muon collider. A new simulation package, CoolSim, based on Geant4 has been developed for the simulation of low-energy beam cooling. New physics processes for low energy muons and protons have been implemented in the Geant4 framework. The group's Frictional Cooling Demonstration experiment aims to verify the principle of the cooling scheme. For this purpose, a 10-cm-long cooling cell has been constructed to test simulation of the energy loss and scattering mechanisms at low energy. This paper contains an introduction to a muon-collider frictional cooling scheme and the status of the demonstration experiment.

Greenwald, Daniel; Caldwell, Allen [Max-Planck-Insitut fuer Physik, Foehringer Ring 6, 80805 Munich (Germany); Bao, Yu [Max-Planck-Insitut fuer Physik, Foehringer Ring 6, 80805 Munich (Germany); Institute of High Energy Physics, Chinese Academy of Sciences, Beijing (China)

2010-03-30T23:59:59.000Z

363

A precision measurement of the muon decay parameter delta  

E-Print Network (OSTI)

The muon decay parameter delta characterizes momentum dependence of the parity-violating muon decay asymmetry. A new measurement of delta has been performed using the first physics data recorded by the TWIST experiment at TRIUMF. The obtained value, delta=0.74964+-0.00066(stat.)+-0.00112(syst.), is consistent with the Standard Model expectation delta=3/4. This is the first determination of delta performed using a blind analysis technique. Combined with other data, the measurement sets new model-independent limits on effective right-handed couplings of the muon. Improved limits on the product of another muon decay parameter, xi, and the muon polarization in pion decay, Pmu, are obtained in the form: 0.9960Pmu*xi<=xi<1.0040, at 90% confidence level. Implications for left-right symmetric models are discussed.

Gaponenko, Andrei

2011-01-01T23:59:59.000Z

364

A precision measurement of the muon decay parameter delta  

E-Print Network (OSTI)

The muon decay parameter delta characterizes momentum dependence of the parity-violating muon decay asymmetry. A new measurement of delta has been performed using the first physics data recorded by the TWIST experiment at TRIUMF. The obtained value, delta=0.74964+-0.00066(stat.)+-0.00112(syst.), is consistent with the Standard Model expectation delta=3/4. This is the first determination of delta performed using a blind analysis technique. Combined with other data, the measurement sets new model-independent limits on effective right-handed couplings of the muon. Improved limits on the product of another muon decay parameter, xi, and the muon polarization in pion decay, Pmu, are obtained in the form: 0.9960Pmu*xi<=xi<1.0040, at 90% confidence level. Implications for left-right symmetric models are discussed.

Andrei Gaponenko

2011-04-14T23:59:59.000Z

365

Muon Collider: Plans, Progress and Challenges  

E-Print Network (OSTI)

We in the physics community expect the LHC to uncover new physics in the next few years. The character and energy scale of the new physics remain unclear, but it is likely that data from the LHC will need to be complemented by information from a lepton collider which can provide for precise examination of new phenomena. We describe the concept, accelerator design, and detector R&D for a high energy Muon Collider as well as the challenges associated with the machine and its detector environment.

Lipton, Ronald

2012-01-01T23:59:59.000Z

366

Electroweak Radiative Corrections to Muon Capture  

E-Print Network (OSTI)

Electroweak radiative corrections to muon capture on nuclei are computed and found to be sizable. They enhance the capture rates for hydrogen and helium by 2.8% and 3.0% respectively. As a result, the value of the induced pseudoscalar coupling, g_P^exp, extracted from a recent hydrogen 1S singlet capture experiment is increased by about 21% to g_P^exp = 7.3 +/- 1.2 and brought into good agreement with the prediction of chiral perturbation theory, g_P^theory=8.2 +/- 0.2. Implications for helium capture rate predictions are also discussed.

A. Czarnecki; W. J. Marciano; A. Sirlin

2007-04-30T23:59:59.000Z

367

Measurement of the K ? /K ? ratio for muon alpha sticking X-rays in muon catalyzed d-t fusion at the RIKEN-RAL Muon Facility  

Science Journals Connector (OSTI)

At the RIKEN-RAL Muon Facility, ?- to ? sticking K ? X-rays were observed for the first time taking advantage of the pulsed beam structure. The precision of the...

S.N. Nakamura; K. Nagamine; T. Matsuzaki; K. Ishida; N. Kawamura…

368

COSMIC-RAY MUON TOMOGRAPHY AND ITS APPLICATION TO THE DETECTION OF HIGH-Z MATERIALS  

E-Print Network (OSTI)

. The mean energy of the muons at the ground is about 4 GeV. The integral 1 #12;intensity of vertical muons change their directions due to the multiple scattering, lose their energy and finally get stopped. A muonCOSMIC-RAY MUON TOMOGRAPHY AND ITS APPLICATION TO THE DETECTION OF HIGH-Z MATERIALS Konstantin

Kurien, Susan

369

A Possible Mechanism of Direct Production of Muon Pairs at High Energies  

Science Journals Connector (OSTI)

......significant fraction of cosmic ray muons with energies greater than several TeVis produced...separation much greater than twice the muon rest energy, the probability of muon pair...meson produc- tion by very high energy muons.7) It should be noted that......

Satio Hayakawa; Ken Kikuchi

1969-02-01T23:59:59.000Z

370

Muon (g – 2): Renormalization at Work, All the Way Down to the Weak Scale  

Science Journals Connector (OSTI)

......sufficient proton-beam energy made it possible...pions, and thus muons, in the laboratory...the maximum allowed energy in the muon rest frame, Emax...decay, the highest-energy positrons are emitted parallel to the muon spin in the muon......

B. Lee Roberts

2007-05-01T23:59:59.000Z

371

High Energy Gamma-Rays in the Atmosphere and Muons Underground and Underwater  

Science Journals Connector (OSTI)

......production rate of the E-component. 2 2. Muons The energy spectrum of muons below 100 GeV has been measured directly by means...However, the size of the burst produced by a muon of given energy fluctuates so much that the muon spectrum can......

Satio Hayakawa; Jun Nishimura; Yoshiaki Yamamoto

1964-04-01T23:59:59.000Z

372

RADIOGRAPHIC IMAGING BELOW A VOLCANIC CRATER FLOOR WITH COSMIC-RAY MUONS  

E-Print Network (OSTI)

horizontally-arriving cosmic ray muon with energy of 1 TeV can penetrate 2.6 km of water. Thus, cosmic-ray muon that uncertainty on the shape and amplitude of the energy spectrum of the muon source is within a few percentRADIOGRAPHIC IMAGING BELOW A VOLCANIC CRATER FLOOR WITH COSMIC-RAY MUONS HIROYUKI K.M. TANAKA

Aoki, Yosuke

373

Studies of Muon-Induced Radioactivity at NuMIRadioactivity at NuMI  

E-Print Network (OSTI)

Studies of Muon-Induced Radioactivity at NuMIRadioactivity at NuMI David Boehnlein Fermi National JASMIN Experiment · JASMIN ­ Japanese & American Study of Muon Interactions and Neutron DetectionMuonMIprogress to study activation at the NuMI muon alcoves. July 24, 2009 NuFact09 - David Boehnlein 3NuFact09 - David

McDonald, Kirk

374

The MUON System in the HERA-B Experiment ITEP, B. Cheremushkinskaya,25 Moscow 117259, Russia  

E-Print Network (OSTI)

The MUON System in the HERA-B Experiment M.Titov 1 ITEP, B. Cheremushkinskaya,25 Moscow 117259, Russia Representing the HERA-B Muon collaboration Abstract The HERA-B experiment is designed to study CP with an internal target. The muon system serves to identify muons with momenta greater than 5 GeV/c. Unambiguous

375

E-Print Network 3.0 - atlas muon chambers Sample Search Results  

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

chambers Search Powered by Explorit Topic List Advanced Search Sample search results for: atlas muon chambers...

376

Muon Simulations for Super-Kamiokande, KamLAND and CHOOZ  

E-Print Network (OSTI)

Muon backgrounds at Super-Kamiokande, KamLAND and CHOOZ are calculated using MUSIC. A modified version of the Gaisser sea level muon distribution and a well-tested Monte Carlo integration method are introduced. Average muon energy, flux and rate are tabulated. Plots of average energy and angular distributions are given. Implications on muon tracker design for future experiments are discussed.

Alfred Tang; Glenn Horton-Smith; Vitaly A. Kudryavtsev; Alessandra Tonazzo

2006-04-07T23:59:59.000Z

377

E-Print Network 3.0 - atmospheric muon neutrino Sample Search...  

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

neutrino Search Powered by Explorit Topic List Advanced Search Sample search results for: atmospheric muon neutrino...

378

E-Print Network 3.0 - atlas muon chamber Sample Search Results  

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

chamber Search Powered by Explorit Topic List Advanced Search Sample search results for: atlas muon chamber...

379

E-Print Network 3.0 - atmospheric muon neutrinos Sample Search...  

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

neutrinos Search Powered by Explorit Topic List Advanced Search Sample search results for: atmospheric muon neutrinos...

380

Muon Detector stacking order performance comparison Richard Lee and Deborah Robinson  

E-Print Network (OSTI)

Muon Detector stacking order performance comparison Richard Lee and Deborah Robinson 08/02/2012 Abstract Four muon detectors have been studied. Detectors were stacked in varying orders top to bottom of the particles in cosmic radiation is the muon. Muons can be detected using a scintillator plastic block

California at Santa Cruz, University of

Note: This page contains sample records for the topic "types electron muon" 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

Accelerator Physics of a Muon Collider Kirk T. McDonald  

E-Print Network (OSTI)

.edu October 20, 1998 Seminar at the Princeton Plasma Physics Laboratory Muon Collider main page: http(Some) Accelerator Physics of a Muon Collider Kirk T. McDonald Princeton U. mcdonald@puphep.princeton.html Princeton Muon Collider page: http://puhep1.princeton.edu/mumu/ 1 #12; What is a Muon Collider

McDonald, Kirk

382

Accelerator Physics of a Muon Collider Kirk T. McDonald  

E-Print Network (OSTI)

.edu October 20, 1998 Seminar at the Princeton Plasma Physics Laboratory Muon Collider main page: http(Some) Accelerator Physics of a Muon Collider Kirk T. McDonald Princeton U. mcdonald@puphep.princeton.html Princeton Muon Collider page: http://puhep1.princeton.edu/mumu/ 1 #12;What is a Muon Collider

McDonald, Kirk

383

Periodicity faults in chain silicates: A new type of planar lattice fault observed with high resolution electron microscopy  

Science Journals Connector (OSTI)

The existence of errors in the periodicity of the tetrahedral chains in pyroxenes and pyroxenoids is predicted. With high resolution electron microscopy of rhodonite, (Mn, Ca)5[Si5O15], and pyroxmangite, (Mn,Fe,C...

M. Czank; F. Liebau

1980-07-01T23:59:59.000Z

384

Micromegas Detectors for the Muon Spectrometer Upgrade of the ATLAS Experiment  

E-Print Network (OSTI)

The Micromegas (MICRO MEsh GAseous Structure) have been proven along the years to be reliable detectors with excellent space resolution and high rate capability. Large area Micromegas will be employed for the first time in high-energy physics for the Muon Spectrometer upgrade of the ATLAS experiment at CERN LHC. A total surface of about 150 m$^2$ of the forward regions of the Muon Spectrometer will be equipped with 8 layers of Micromegas modules. Each module covers a surface from 2 to 3 m$^2$ for a total active area of 1200 m$^2$. Together with the small-strips Thin Gap Chambers, they will compose the two New Small Wheels, which will replace the innermost stations of the ATLAS Endcap Muon tracking system in the 2018/19 shutdown. The breakthroughs and developments of this type of Micro Pattern Gas Detector will be reviewed, along with the path towards the construction of the modules, which will take place in several production sites starting in 2015. An overview of the detector performances obtained in the rec...

Iodice, Mauro; The ATLAS collaboration

2014-01-01T23:59:59.000Z

385

Micromegas Detectors for the Muon Spectrometer Upgrade of the ATLAS Experiment  

E-Print Network (OSTI)

The Micromegas (MICRO MEsh GAseous Structure) chambers have been proven along the years to be reliable detectors with excellent space resolution and high rate capability. Large area Micromegas will be employed for the first time in high-energy physics for the Muon Spectrometer upgrade of the ATLAS experiment at CERN LHC. A total surface of about 150 m2 of the forward regions of the Muon Spectrometer will be equipped with 8 layers of Micromegas modules. Each module covers a surface from 2 to 3 m2 for a total active area of 1200 m2. Together with the small-strips Thin Gap Chambers, they will compose the two New Small Wheels, which will replace the innermost stations of the ATLAS Endcap Muon tracking system in the 2018/19 shutdown. The principles of operation and recent developments of this type of Micro Pattern Gas Detector will be reviewed, along with our plans towards the construction of the modules, which will take place in several production sites. An overview of the detector performances obtained in the re...

Iodice, M; The ATLAS collaboration

2014-01-01T23:59:59.000Z

386

Muon Spin Relaxation Study of Spinel Lithium Manganese Oxides  

Science Journals Connector (OSTI)

Muons can be implanted into any material, and the direction of the muon spin at the instant of decay (?+ ? e+ + ?e + ???, lifetime = 2.179 ?s) provides information on the dynamics of the muon during its lifetime and on the static and fluctuating magnetic fields from neighboring nuclear and atomic moments. ... On the other hand, the shape of the H+-MnO2 spectrum at 100 K shows two Gaussian components, which indicates the existence of at least two different depolarization rates that can be due to muons at two different muon sites. ... Therefore, these results indicate that the temperature for onset of Li+ ion diffusion decreases with an increase in the amount of lithium in the spinel manganese oxide, which is not incompatible with a higher Li+ diffusion coefficient on LiMn2O4 than on Li1.33Mn1.67O4 found from NMR experiments,21 since NMR data will average over all Li nuclei whereas muons only interact with those Li nearest to the muon. ...

María J. Ariza; Deborah J. Jones; Jacques Rozière; James S. Lord; Didier Ravot

2003-05-28T23:59:59.000Z

387

Laboratory tests of Lorentz and CPT symmetry with muons  

Science Journals Connector (OSTI)

The prospects are explored for testing Lorentz and CPT symmetry in the muon sector via the spectroscopy of muonium and various muonic atoms, and via measurements of the anomalous magnetic moments of the muon and antimuon. The effects of Lorentz-violating operators of both renormalizable and nonrenormalizable dimensions are included. We derive observable signals, extract first constraints from existing data on a variety of coefficients for Lorentz and CPT violation, and estimate sensitivities attainable in forthcoming experiments. The potential of Lorentz violation to resolve the proton radius puzzle and the muon anomaly discrepancy is discussed.

André H. Gomes; V. Alan Kostelecký; Arnaldo J. Vargas

2014-10-21T23:59:59.000Z

388

FFAG LATTICE FOR MUON ACCELERATION WITH DISTRIBUTED RF.  

SciTech Connect

A future muon collider or neutrino factory requires fast acceleration to minimize muon decay. We have previously described an FFAG ring that accelerated muons from 10 to 20 GeV in energy. The ring achieved its large momentum acceptance using a low-emittance lattice with a small dispersion. In this paper, we present an update on that ring. We have used design tools that more accurately represent the ring's behavior at large momentum offsets. We have also improved the dynamic aperture from the earlier design.

COURANT,E.D..TRBOJEVIC,D.BERG,S.J.BLASKIEWICZ,M.COURANT,E.D..TRBOJEVIC,D.BERG,S.J.BLASKIEWICZ,M.M.PALMER,R.GARREN,A.

2003-05-12T23:59:59.000Z

389

Muon catalyzed fusion and muon to 3He transfer in solid T2 studied by X-ray and neutron detection  

Science Journals Connector (OSTI)

X-ray and neutron measurements were carried out for muon catalyzed fusion and related phenomena in solid...2. The X-ray originated from the ?- to ? sticking in muon catalyzed fusion; t + t + ? - ...

T. Matsuzaki; K. Nagamine; K. Ishida; S.N. Nakamura; N. Kawamura…

390

Ordinary Muon Capture in Hydrogen Reexamined  

E-Print Network (OSTI)

The rate of muon capture in a muonic hydrogen atom is calculated in heavy-nucleon chiral perturbation theory up to next-to-next-to leading order. To this order, we present the systematic evaluation of all the corrections due to the QED and electroweak radiative corrections and the proton-size effect. Since the low-energy constants involved can be determined from other independent sources of information, the theory has predictive power. For the hyperfine-singlet $\\mu p$ capture rate $\\Gamma_0$, our calculation gives $\\Gamma_0=710 \\,\\pm 5\\,s^{-1}$, which is in excellent agreement with the experimental value obtained in a recent high-precision measurement by the MuCap Collaboration.

U. Raha; F. Myhrer; K. Kubodera

2013-06-03T23:59:59.000Z

391

Muon g-2: a mini review  

E-Print Network (OSTI)

The current status of the experimental measurements and theoretical predictions of the anomalous magnetic moment of the muon $a_\\mu$ is briefly reviewed. The emphasis is put on the evaluation of the hadronic contribution to $a_\\mu$ as it has the largest uncertainty among all Standard Model contributions. The precision of the hadronic contribution is driven by the input e+e- data predominantly from the \\pi+pi- channel. Including the latest experimental data on e+e- annihilation into hadronsfrom CMD2 and SND for the \\pi+\\pi- channel and BaBar for multihadron final states, the updated Standard Model prediction disagrees with the measurement dominated by BNL by 3.3 standard deviations, with the theoretical precision exceeding the experimental one.

Zhiqing Zhang

2008-01-31T23:59:59.000Z

392

First direct observation of muon antineutrino disappearance  

This letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ??? production, accumulating an exposure of 1.71 x 1020 protons on target. In the Far Detector, 97 charged current ??? events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3?. The best fit to oscillation yields |?m?2| = (3.36-0.40 +0.46(stat.) ± 0.06(syst.)) x 10-3 eV2, sin2(2 ??) = 0.86-0.12+0.11 (stat.) ± 0.01(syst.). The MINOS ?? and ??? measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.

Adamson, P [Fermilab; Andreopoulos, C [Rutherford; Auty, D J [Sussex U.; Ayres, D S [Argonne; Backhouse, C [Oxford U.; Barr, G [Oxford U.; Bishai, M [Brookhaven; Blake, A [Cambridge U.; Bock, G J [Fermilab; Boehnlein, D J [/Fermilab; Bogert, D [Fermilab; Harvard U., Phys. Dept.

2011-07-05T23:59:59.000Z

393

Melvin Schwartz and the Discovery of the Muon Neutrino  

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

Melvin Schwartz and the Discovery of the Muon Neutrino Melvin Schwartz and the Discovery of the Muon Neutrino Resources with Additional Information Melvin Schwartz Courtesy Brookhaven National Laboratory Melvin Schwartz was the co-winner of the 1988 Nobel Prize in Physics "for the neutrino beam method and the demonstration of the doublet structure of the leptons through the discovery of the muon neutrino". 'In 1962, Schwartz, with Leon Lederman and Jack Steinberger ... discovered the muon neutrino at the Alternating Gradient Synchrotron (AGS), the then brand-new accelerator at the U.S. Department of Energy's Brookhaven National Laboratory. ... First coming to Brookhaven in 1955, Schwartz performed his Ph.D. thesis research through 1956 at the Laboratory's first accelerator, the Cosmotron. While finishing his thesis, he was employed by the Laboratory from 1956-58.

394

The cosmic ray muon energy spectum via ?erenkov radiation  

E-Print Network (OSTI)

In this thesis, I designed and constructed a basic Cerenkov detector to measure the energy spectrum of cosmic ray muons for use in the graduate experimental physics courses, 8.811/2. The apparatus consists of a light-tight ...

Quintero, Eric Antonio

2010-01-01T23:59:59.000Z

395

Range-energy relation for ultra-relativistic muons  

Science Journals Connector (OSTI)

A range-energy relation for ultra-relativistic muons is calculated: 1) extending the calculation...4...GeV; 2) emploing the Murota-Ueda-Tanaka theory, for the pair production energy loss; 3) utilizing for the nuc...

C. Castagnoli; A. De Maeco; R. Scrimaglio

1964-01-01T23:59:59.000Z

396

Radiative energy loss of muons in the MINOS Far Detector.  

E-Print Network (OSTI)

??Higher energy (>100GeV)muons lose their energy preferentially through radiativemethods such as Bremsstrahlung, Pair-production and Photo-production. Because the radiative loss of the energy is a stochastic… (more)

Bhattarai, Prabhat

2010-01-01T23:59:59.000Z

397

Muons of very and ultra-high energy cosmic rays  

Science Journals Connector (OSTI)

In many cosmic rays experiments at very and ultra-high energies, an excess of muons (including those of very high energy, >100 TeV) is observed that cannot ... compositions, and especially the observed excesses o...

A. G. Bogdanov; R. P. Kokoulin…

2013-11-01T23:59:59.000Z

398

Muon Inelasticity in High-Energy Neutrino Interaction  

Science Journals Connector (OSTI)

......Copyright (c) 1972 Progress of Theoretical Physics December 1972 research-article Letters to the Editor Muon Inelasticity in High-Energy Neutrino Interaction Yoshitaka Okumura Research Institute for Fundamental Physics, Kyoto University, Kyoto......

Yoshitaka Okumura

1972-12-01T23:59:59.000Z

399

Multiple-pion production by high-energy muons  

Science Journals Connector (OSTI)

By the use of two cloud chambers containing lead plates and iron plates, we observed 133 events of the penetrating showers produced by muons in the energy range from about 10 GeV to a ... . The behaviours of the ...

S. Higashi; T. Kitamura; Y. Mishima; S. Miyamoto; Y. Watase…

1965-01-01T23:59:59.000Z

400

Change of energy profiles for muons upon lattice relaxation  

Science Journals Connector (OSTI)

Systematic calculations of potentials for muons and protons in various simple metals have...?SR are discussed. The modification of the energy profiles with lattice relaxation is studied in...

S. Estreicher; P. F. Meier

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Standard Model Prediction of the Muon Anomalous Magnetic Moment  

E-Print Network (OSTI)

I review the present Standard Model prediction of the muon anomalous magnetic moment. The discrepancy with its experimental determination is (25.5 +- 8.0) x 10^-10, i.e., 3.2 standard deviations.

Joaquim Prades

2010-02-18T23:59:59.000Z

402

Muon diagnostics of the Earth’s atmosphere and magnetosphere  

Science Journals Connector (OSTI)

A method of distant monitoring of the Earth’s magnetosphere and atmosphere is described, which is based on the close correlation between the modulations in the flux of atmospheric muons detected at the Earth’s su...

N. S. Barbashina; V. V. Borog…

2007-07-01T23:59:59.000Z

403

Automatic measurement of the mean lifetime of the muon  

Science Journals Connector (OSTI)

This paper describes a microcomputer?based apparatus for the measurement of the mean lifetime of the muon. The equipment exposes the student to many modern experimental techniques and is suitable for an advanced undergraduatephysics laboratory.

Roger J. Lewis

1982-01-01T23:59:59.000Z

404

Fermilab Muon Ring Arrives to a Large Crowd of Fans  

SciTech Connect

A very large group of people gathered to watch the muon g-2 ring on its last leg of the big move from Brookhaven National Laboratory in Long Island, NY to Fermilab in Batavia, IL.

None

2013-08-15T23:59:59.000Z

405

Muon Physics: A Pillar of the Standard Model  

E-Print Network (OSTI)

Since its discovery in the 1930s, the muon has played an important role in our quest to understand the sub-atomic theory of matter. The muon was the first second-generation standard-model particle to be discovered, and its decay has provided information on the (Vector -Axial Vector) structure of the weak interaction, the strength of the weak interaction, G_F, and the conservation of lepton number (flavor) in muon decay. The muon's anomalous magnetic moment has played an important role in restricting theories of physics beyond the standard standard model, where at present there is a 3.4 standard-deviation difference between the experiment and standard-model theory. Its capture on the atomic nucleus has provided valuable information on the modification of the weak current by the strong interaction which is complementary to that obtained from nuclear beta decay.

B. Lee Roberts

2007-04-18T23:59:59.000Z

406

Fermilab | Newsroom | Press Releases | May 8, 2013: Muon g-2...  

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

Muon g-2 Experiment Images and Videos Click on links below images for medium and high-resolution jpeg images. When using these images, please credit each photo as indicated. Press...

407

The muon anomalous magnetic moment, a view from the lattice  

E-Print Network (OSTI)

We review some of the issues that arise in attempts to compute the hadronic corrections to the muon anomalous magnetic moment using Lattice QCD. We concentrate on the dominant contribution, which requires an accurate evaluation of the hadronic vacuum polarization.

Christopher Aubin; Thomas Blum; Maarten Golterman; Kim Maltman; Santiago Peris

2013-11-21T23:59:59.000Z

408

(ATLAS Muon TDC version 1 & 2) User's Manual  

E-Print Network (OSTI)

1 AMT-1 & 2 (ATLAS Muon TDC version 1 & 2) User's Manual Yasuo Arai KEK, National High Energy Accelerator Research Organization 1-1 Oho, Tsukuba, Ibaraki 305, Japan yasuo.arai@kek.jp, http://atlas

van Suijlekom, Walter

409

SU?C?105?05: Reference Dosimetry of High?Energy Electron Beams with a Farmer?Type Ionization Chamber  

SciTech Connect

Purpose: To investigate gradient effects and provide Monte Carlo calculated beam quality conversion factors to characterize the Farmer?type NE2571 ion chamber for high?energy reference dosimetry of clinical electron beams. Methods: The EGSnrc code system is used to calculate the absorbed dose to water and to the gas in a fully modeled NE2571 chamber as a function of depth in a water phantom. Electron beams incident on the surface of the phantom are modeled using realistic BEAMnrc accelerator simulations and electron beam spectra. Beam quality conversion factors are determined using calculated doses to water and to air in the chamber in high?energy electron beams and in a cobalt?60 reference field. Calculated water?to?air stopping power ratios are employed for investigation of the overall ion chamber perturbation factor. Results: An upstream shift of 0.3–0.4 multiplied by the chamber radius, r-cav, both minimizes the variation of the overall ion chamber perturbation factor with depth and reduces the difference between the beam quality specifier (R{sub 5} {sub 0}) calculated using ion chamber simulations and that obtained with simulations of dose?to?water in the phantom. Beam quality conversion factors are obtained at the reference depth and gradient effects are optimized using a shift of 0.2r-cav. The photon?electron conversion factor, k-ecal, amounts to 0.906 when gradient effects are minimized using the shift established here and 0.903 if no shift of the data is used. Systematic uncertainties in beam quality conversion factors are investigated and amount to between 0.4 to 1.1% depending on assumptions used. Conclusion: The calculations obtained in this work characterize the use of an NE2571 ion chamber for reference dosimetry of high?energy electron beams. These results will be useful as the AAPM continues to review their reference dosimetry protocols.

Muir, B; Rogers, D [Carleton University, Ottawa, ON (Canada)] [Carleton University, Ottawa, ON (Canada)

2013-06-15T23:59:59.000Z

410

A VERY FAST RAMPING MUON SYNCHROTRON FOR A NEUTRINO FACTORY.  

SciTech Connect

A 4600 Hz fast ramping synchrotron is studied as an economical way of accelerating muons from 4 to 20 GeV/c for a neutrino factory. Eddy current losses are minimized by the low machine duty cycle plus thin grain oriented silicon steel laminations and thin copper wires. Combined function magnets with high gradients alternating within single magnets form the lattice. Muon survival is 83%.

SUMMERS,D.J.BERG,J.S.PALMER,R.B.GARREN,A.A.

2003-05-12T23:59:59.000Z

411

Muon Production in Relativistic Cosmic-Ray Interactions  

SciTech Connect

Cosmic-rays with energies up to 3x1020 eV have been observed. The nuclear composition of these cosmic rays is unknown but if the incident nuclei are protons then the corresponding center of mass energy is sqrt snn = 700 TeV. High energy muons can be used to probe the composition of these incident nuclei. The energy spectra of high-energy (> 1 TeV) cosmic ray induced muons have been measured with deep underground or under-ice detectors. These muons come from pion and kaon decays and from charm production in the atmosphere. Terrestrial experiments are most sensitive to far-forward muons so the production rates aresensitive to high-x partons in the incident nucleus and low-x partons in the nitrogen/oxygen targets. Muon measurements can complement the central-particle data collected at colliders.This paper will review muon production data and discuss some non-perturbative (soft) models that have been used to interpret the data. I will show measurements of TeV muon transverse momentum (pT) spectra in cosmic-ray air showers fromMACRO, and describe how the IceCube neutrino observatory and the proposed Km3Net detector will extend these measurements to a higher pT region where perturbative QCD should apply. With a 1 km2 surface area, the full IceCube detector should observe hundreds of muons/year with pT in the pQCD regime.

Klein, Spencer

2009-07-27T23:59:59.000Z

412

Measurement of CNGS muon neutrino speed with Borexino  

E-Print Network (OSTI)

We have measured the speed of muon neutrinos with the Borexino detector using short-bunch CNGS beams. The final result for the difference in time-of-flight between a =17 GeV muon neutrino and a particle moving at the speed of light in vacuum is {\\delta}t = 0.8 \\pm 0.7stat \\pm 2.9sys ns, well consistent with zero.

Borexino Collaboration

2012-07-30T23:59:59.000Z

413

A New High-intensity, Low-momentum Muon Beam for the Generation of Low-energy Muons at PSI  

Science Journals Connector (OSTI)

At the Paul Scherrer Institute (PSI, Villigen, Switzerland) a new high-intensity muon beam line with momentum p...< 40 MeV/c is currently being commissioned. The beam line is especially designed to serve the need...

T. Prokscha; E. Morenzoni; K. Deiters; F. Foroughi; D. George…

2004-12-01T23:59:59.000Z

414

A New High-Intensity, Low-Momentum Muon Beam for the Generation of Low-Energy Muons at PSI  

Science Journals Connector (OSTI)

At the Paul Scherrer Institute (PSI, Villigen, Switzerland) a new high-intensity muon beam line with momentum p...< 40 MeV/c is currently being commissioned. The beam line is especially designed to serve the need...

T. Prokscha; E. Morenzoni; K. Deiters; F. Foroughi; D. George; R. Kobler…

2005-01-01T23:59:59.000Z

415

Time?differential radio?frequency muon spin resonance (TD?RF?SR) technique at a pulsed muon beam  

Science Journals Connector (OSTI)

Longitudinal?field ?SR methods, e.g., radio?frequency ?+...spin resonance (RF?SR), are well suited to investigate dynamic processes that destroy the phase coherence of the muon spin ensemble. Additional informati...

R. Scheuermann; J. Schmidl; A. Seeger; Th. Stammler; D. Herlach…

416

Performance of numerical approximation on the calculation of two-center two-electron integrals over non-integer Slater-type orbitals using elliptical coordinates  

E-Print Network (OSTI)

The two-center two-electron Coulomb and hybrid integrals arising in relativistic and nonrelativistic ab-initio calculations of molecules are evaluated over the non-integer Slater-type orbitals via ellipsoidal coordinates. These integrals are expressed through new molecular auxiliary functions and calculated with numerical Global-adaptive method according to parameters of non-integer Slatertype orbitals. The convergence properties of new molecular auxiliary functions are investigated and the results obtained are compared with results found in the literature. The comparison for two-center twoelectron integrals is made with results obtained from one-center expansions by translation of wavefunction to same center with integer principal quantum number and results obtained from the Cuba numerical integration algorithm, respectively. The procedures discussed in this work are capable of yielding highly accurate two-center two-electron integrals for all ranges of orbital parameters.

Ali Ba?c?; Philip E. Hoggan

2014-05-21T23:59:59.000Z

417

Limits on a muon flux from neutralino annihilations in the Sun with the IceCube 22-string detector  

E-Print Network (OSTI)

rect searches [21, 22]. A muon energy threshold of 1 GeV wasangular error ?, the mean muon energy , the e?ectivetices the mean energy of simulated signal muons ranges from

Klein, Spencer; IceCube Collaboration

2009-01-01T23:59:59.000Z

418

Limits on a muon flux from neutralino annihilations in the Sun with the IceCube 22-string detector  

E-Print Network (OSTI)

California. APS/123-QED Limits on a muon ?ux from neutralinoLimits on a muon flux from neutralino annihilations in theApril 28, 2009) A search for muon neutrinos from neutralino

Klein, Spencer; IceCube Collaboration

2009-01-01T23:59:59.000Z

419

e/a classification of Hume–Rothery Rhombic Triacontahedron-type approximants based on all-electron density functional theory calculations  

SciTech Connect

There are three key electronic parameters in elucidating the physics behind the Hume–Rothery electron concentration rule: the square of the Fermi diameter (2kF)2, the square of the critical reciprocal lattice vector and the electron concentration parameter or the number of itinerant electrons per atom e/a. We have reliably determined these three parameters for 10 Rhombic Triacontahedron-type 2/1–2/1–2/1 (N?=?680) and 1/1–1/1–1/1 (N?=?160–162) approximants by making full use of the full-potential linearized augmented plane wave-Fourier band calculations based on all-electron density-functional theory. We revealed that the 2/1–2/1–2/1 approximants Al13Mg27Zn45 and Na27Au27Ga31 belong to two different sub-groups classified in terms of equal to 126 and 109 and could explain why they take different e/a values of 2.13 and 1.76, respectively. Among eight 1/1–1/1–1/1 approximants Al3Mg4Zn3, Al9Mg8Ag3, Al21Li13Cu6, Ga21Li13Cu6, Na26Au24Ga30, Na26Au37Ge18, Na26Au37Sn18 and Na26Cd40Pb6, the first two, the second two and the last four compounds were classified into three sub-groups with ?=?50, 46 and 42; and were claimed to obey the e/a?=?2.30, 2.10–2.15 and 1.70–1.80 rules, respectively.

Mizutani, U.; Inukai, M.; Sato, H.; Zijlstra, E.S.; Lin, Q.

2014-05-16T23:59:59.000Z

420

A technique for predicting the muon induced upset cross section in submicron MOS devices using proton tests and simulation.  

E-Print Network (OSTI)

??Muons produced by cosmic rays in the upper atmosphere can induce single event upsets in modern technology nodes. Consequently, errors caused by muons have become… (more)

Trippe, James Michael

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Future Accelerators, Muon Colliders, and Neutrino Factories  

SciTech Connect

Particle physics is driven by five great topics. Neutrino oscillations and masses are now at the fore. The standard model with extensions to supersymmetry and a Higgs to generate mass explains much of the field. The origins of CP violation are not understood. The possibility of extra dimensions has raised tantalizing new questions. A fifth topic lurking in the background is the possibility of something totally different. Many of the questions raised by these topics require powerful new accelerators. It is not an overstatement to say that for some of the issues, the accelerator is almost the experiment. Indeed some of the questions require machines beyond our present capability. As this volume attests, there are parts of the particle physics program that have been significantly advanced without the use of accelerators such as the subject of neutrino oscillations and many aspects of the particle-cosmology interface. At this stage in the development of physics, both approaches are needed and important. This chapter first reviews the status of the great accelerator facilities now in operation or coming on within the decade. Next, midrange possibilities are discussed including linear colliders with the adjunct possibility of gamma-gamma colliders, muon colliders, with precursor neutrino factories, and very large hadron colliders. Finally visionary possibilities are considered including plasma and laser accelerators.

Richard A Carrigan, Jr.

2001-12-19T23:59:59.000Z

422

Assessment of Solder Interconnect Integrity in Dismantled Electronic Components from N57 and B61 Tube-Type Radars  

SciTech Connect

Aging analyses were performed on solder joints from two radar units: (1) a laboratory, N57 tube-type radar unit and (2) a field-returned, B61-0, tube-type radar unit. The cumulative temperature environments experienced by the units during aging were calculated from the intermetallic compound layer thickness and the mean Pb-rich phase particle size metrics for solder joints in the units, assuming an aging time of 35 years for both radars. Baseline aging metrics were obtained from a laboratory test vehicle assembled at AS/FM and T; the aging kinetics of both metrics were calculated from isothermal aging experiments. The N57 radar unit interconnect board solder joints exhibited very little aging. The eyelet solder joints did show cracking that most likely occurred at the time of assembly. The eyelet, SA1126 connector solder joints, showed some delamination between the Cu pad and underlying laminate. The B61 field-returned radar solder joints showed a nominal degree of aging. Cracking of the eyelet solder joints was observed. The Pb-rich phase particle measurements indicated additional aging of the interconnects as a result of residual stresses. Cracking of the terminal pole connector, pin-to-pin solder joint was observed; but it was not believed to jeopardize the electrical functionality of the interconnect. Extending the stockpile lifetime of the B61 tube-type radar by an additional 20 years would not be impacted by the reliability of the solder joints with respect to further growth of the intermetallic compound layer. Additional coarsening of the Pb-rich phase will increase the joints' sensitivity to thermomechanical fatigue.

Rejent, J.A.; Vianco, P.T.; Woodrum, R.A.

1999-07-01T23:59:59.000Z

423

Muon-neutrino carbon charged-current interaction near the muon threshold  

Science Journals Connector (OSTI)

A measurement of the muon-neutrino carbon charged-current cross section, C12(??,?-)X, was performed using the in-flight pion-decay neutrino source at the LAMPF accelerator. At an average interacting neutrino energy of 202 MeV an inclusive cross section of (15.9±2.6±3.7)×10-39 cm2 was measured. This value is in best agreement with the Fermi-gas model and is in disagreement with a previous experiment and subsequent calculations that yielded substantially lower cross sections. However, the muon energy spectrum shows a marked depletion of events at high energies compared to the Fermi-gas model. From a small sample of events in which the final-state nucleus was in the ground state of N12, a cross section for the reaction C12(??,?-)12N(g.s.) of (1.7±0.8±0.3)×10-39 cm2 or about 11±5 % of the total event rate was obtained.

D. D. Koetke et al.

1992-12-01T23:59:59.000Z

424

Electron CoolingElectron Cooling Sergei Nagaitsev  

E-Print Network (OSTI)

Electron CoolingElectron Cooling Sergei Nagaitsev FNAL - AD April 28, 2005 #12;Electron Cooling methods must "get around the theorem" e.g. by pushing phase-space around. #12;Electron Cooling - Nagaitsev 3 TodayToday''s Menus Menu What is cooling? Types of beam cooling Electron cooling Conclusions #12

Fermilab

425

An Electromagnetic Calorimeter for Spectroscopy of TeV Cosmic Rays Muons  

Science Journals Connector (OSTI)

In principle, the energy of muons from cosmic rays can be deduced from the frequency and the energy of secondary showers, produced by the muons in thick absorber layers. The main interaction processes of high-energy

I. M. Brâncu?; H. J. Mathes; J. Wentz; H. Bozdog…

1994-01-01T23:59:59.000Z

426

Interaction of high energy muons in association with EAS, with rock and lead  

Science Journals Connector (OSTI)

An investigation on the interaction of high energy muons, associated with EAS and having energies greater than several hundred GeV, has been ... together with a scintillator detector to observe the muons and acco...

B Chowdhuri; Y C Saxena

1975-09-01T23:59:59.000Z

427

Energy spectrum and angular distribution of prompt cosmic-ray muons  

Science Journals Connector (OSTI)

The energy spectrum and angular distribution of atmospheric prompt muons are calculated by using an integral solution ... production of charmed particles, their decay and muon transport in the atmosphere. Current...

C. Castagnoli; P. Picchi; A. Castellina; B. D’Ettorre Piazzoli…

1984-01-01T23:59:59.000Z

428

Studying High $p_T$ Muons in Cosmic-Ray Air Showers  

E-Print Network (OSTI)

Most cosmic-ray air shower arrays have focused on detecting electromagnetic shower particles and low energy muons. A few groups (most notably MACRO + EASTOP and SPASE + AMANDA) have studied the high energy muon component of showers. However, these experiments had small solid angles, and did not study muons far from the core. The IceTop + IceCube combination, with its 1 km$^2$ muon detection area can study muons far from the shower core. IceCube can measure their energy loss ($dE/dx$), and hence their energy. With the energy, and the known distribution of production heights, the transverse momentum ($p_T$) spectrum of high $p_T$ muons can be determined. The production of these muons is calculable in perturbative QCD, so the measured muon spectra can be used to probe the composition of incident cosmic-rays.

Spencer R. Klein

2006-12-02T23:59:59.000Z

429

A semi Monte Carlo calculation of the flux of high-energy muons in air showers  

Science Journals Connector (OSTI)

A semi Monte Carlo method has been used to calculate the flux of muons of energy ?180 GeV associated with air showers at ... of nucleon and pion interactions at ultra-high energies. Various aspects of these muons

Siddheshwar Lal

1967-03-21T23:59:59.000Z

430

Energy spectrum of cosmic ray muons above 10 TeV according to BUST data  

Science Journals Connector (OSTI)

The energy spectrum of cosmic ray muons in the range of several TeV to ... obtained through the analysis of multiple interactions of muons (the pair meter technique) in the ... are compared with prior BUST data o...

A. G. Bogdanov; R. P. Kokoulin…

2011-03-01T23:59:59.000Z

431

Born-Oppenheimer expansion: From muon distribution to dissipation in fission  

Science Journals Connector (OSTI)

It is shown that a consistent treatment of momentum translation by a muon in the problem of the distribution of muons among prompt-fission fragments modifies the nonadiabatic transition operator in the Born-Oppenheimer

F. F. Karpeshin

2000-05-01T23:59:59.000Z

432

Muon content of ultrahigh-energy air showers: Yakutsk data versus simulations  

Science Journals Connector (OSTI)

A sample of 33 extensive air showers (EASs) with estimated primary energies above 2 × 1019 eV and high-quality muon data recorded by the Yakutsk EAS array is analyzed. The observed muon density is compared event-...

A. V. Glushkov; I. T. Makarov; M. I. Pravdin; I. E. Sleptsov…

2008-04-01T23:59:59.000Z

433

E-Print Network 3.0 - alice muon spectrometer Sample Search Results  

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

Search Sample search results for: alice muon spectrometer Page: << < 1 2 3 4 5 > >> 1 (LHC) , 2750 . ALICE, Summary: ., "Stations 4 and 5 of the ALICE muon spectrometer: modular...

434

Electron Model Of A Dogbone RLA With Multi-Pass Arcs  

SciTech Connect

The design of a dogbone Recirculated Linear Accelerator, RLA, with linear-field multi-pass arcs was earlier developed [1] for accelerating muons in a Neutrino Factory and a Muon Collider. It allows for efficient use of expensive RF while the multi-pass arc design based on linear combined-function magnets exhibits a number of advantages over separate-arc or pulsed-arc designs. Such an RLA may have applications going beyond muon acceleration. This paper describes a possible straightforward test of this concept by scaling a GeV scale muon design for electrons. Scaling muon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.5 MeV electron beam is injected at the middle of a 3 MeV/pass linac with two double-pass return arcs and is accelerated to 18 MeV in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, which arises from scaling the 200 MHz muon RF to the frequency readily available at CEBAF: 1.5 GHz. The footprint of a complete RLA fits in an area of 25 by 7 m. The scheme utilizes only fixed magnetic fields including injection and extraction. The hardware requirements are not very demanding, making it straightforward to implement

Beard, Kevin B. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States) and MUONS Inc., Batavia, IL (United States); Roblin, Yves R. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Morozov, Vasiliy [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Bogacz, Slawomir Alex [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Krafft, Geoffrey A. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

2012-09-01T23:59:59.000Z

435

CMS PAPER CFT-09-005 Measurement of the Muon Stopping Power in Lead  

E-Print Network (OSTI)

is exploited to measure the specific energy loss of muons in the lead tungstate (PbWO4) of the elec with low-momentum muons. The muon critical energy in PbWO4 is measured to be 160+5 -6 ±8 GeV, in agree is the total muon energy, x is the thickness of the traversed material, commonly mea- sured in mass per unit

Roma "La Sapienza", Università di

436

RELATIVE CYTOGENETIC EFFICIENCY OF MUONS AND ?- MESONS IN ZEA MAYS (L.)  

Science Journals Connector (OSTI)

...mesons and left the muons essentially unchanged...for about a 1-GeV energy loss. With about 2...to 5000 rads. The energy transfer of muons and 7r- mesons is known to be different. Muons deposit energy primarily through ionization...

Alexander Micke; Harold H. Smith; Robert G. Woodley; Alfred Mashke

1964-01-01T23:59:59.000Z

437

Muon Colliders: New Prospects for Precision Physics and the High Energy Frontier  

E-Print Network (OSTI)

An overview is given of muon collider technology and of the current status of the muon collider research program. The exciting potential of muon colliders for both neutrino physics and collider physics studies is then described and illustrated using self-consistent collider parameter sets at 0.1 TeV to 100 TeV center-of-mass energies.

Bruce J. King

1999-08-08T23:59:59.000Z

438

R-Axion: A New LHC Physics Signature Involving Muon Pairs  

Science Journals Connector (OSTI)

......decays into a pair of muons and leaves a displaced...Ibe M. J. High Energy Phys. (2009) 03...T. T. J. High Energy Phys. (2009) 04...Signature Involving Muon Pairs~) Hock-Seng...Signature Involving Muon Pairs 29 2. Interactions...sectors, the low energy effective theory......

Hock-Seng Goh; Masahiro Ibe

2009-04-01T23:59:59.000Z

439

A Proposal of the Method for Energy Measurements of Muons over 10 TeV  

Science Journals Connector (OSTI)

......energy determination method of high energy muons, which is based upon an observation...TeV. The uncertainty of the muon energy to be measured can be reduced if...the Editor paratus when a high energy muon in TeV region traverses through......

Tomonori Wada; Takashi Kitamura

1969-06-01T23:59:59.000Z

440

The muon g-2: what does it tell us? Fred Jegerlehner  

E-Print Network (OSTI)

The muon g-2: what does it tell us? Fred Jegerlehner Institute of Physics, University of Silesia and prospects of physics of the muon anomalous magnetic mo- ment and its role it may play in the LHC era/Humboldt University Berlin F. Jegerlehner KWW LHC 2009, Warsaw, May 2010 #12;The muon anomalous magnetic moment 1. aµ

Röder, Beate

Note: This page contains sample records for the topic "types electron muon" 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

MuON: Epidemic Based Mutual Anonymity Neelesh Bansod Ashish Malgi Byung Kyu Choi  

E-Print Network (OSTI)

MuON: Epidemic Based Mutual Anonymity Neelesh Bansod Ashish Malgi Byung Kyu Choi Jean Mayo Michigan investigation. This paper presents MuON, a protocol to achieve mu- tual anonymity in unstructured P2P networks. MuON lever- ages epidemic-style data dissemination to deal with the high churn (changes in system

Choi, Byung K.

442

MUON DECAY PARAMETERS Revised June 2011 by W. Fetscher and H.-J. Gerber (ETH  

E-Print Network (OSTI)

­ 1­ MUON DECAY PARAMETERS Revised June 2011 by W. Fetscher and H.-J. Gerber (ETH Z¨urich). Introduction: All measurements in direct muon decay, µ- e- + 2 neutrals, and its inverse, µ + e- µ- + neutral on muon decay are valid for the leptonic tau decays + + ¯e with the replacements mµ m , me m

443

Muon Collider R&D at Princeton Shoibal Chakravarty (graduate student)  

E-Print Network (OSTI)

Muon Collider R&D at Princeton Shoibal Chakravarty (graduate student) Hulya Guler (undergraduate) Changguo Lu Kirk McDonald Eric Prebys Sven Vahsen (graduate student) [Members of the Muon Collider Advisory Council Meeting Princeton Muon Collider page: http://puhep1.princeton.edu/mumu/ 1 #12; What

McDonald, Kirk

444

Muon Life*me Study Ben Fox-Shapiro and Chase Cummings  

E-Print Network (OSTI)

Muon Life*me Study Ben Fox-Shapiro and Chase Cummings #12;Research Ques*ons What is the average life*me of a muon? Is the measured life*me the same for all filler materials and detector configura*ons? #12;Experiment · The average life*me of a muon

California at Santa Cruz, University of

445

THE MUON CONTENT OF EXTENSIVE AIR SHOWERS WITH E 2 x 10 17  

E-Print Network (OSTI)

HE 3.4-7 THE MUON CONTENT OF EXTENSIVE AIR SHOWERS WITH E 2 x 10 17 EV. G.L. Cassiday, R. Cooper, S and the Michigan muon array are operating in coincidence, simultaneously measuring the energy, depth of shower maximum, and muon content of high energy (E 2 x 10 17 eV) extensive air showers. We present

446

MUON DECAY PARAMETERS Revised August 2009 by W. Fetscher and H.-J. Gerber (ETH  

E-Print Network (OSTI)

­ 1­ MUON DECAY PARAMETERS Revised August 2009 by W. Fetscher and H.-J. Gerber (ETH Z¨urich). Introduction: All measurements in direct muon decay, - e- + 2 neutrals, and its inverse, + e- - + neutral on muon decay are valid for the leptonic tau decays + + ¯e with the replacements m m , me m

447

Muon g -2 from and e+ a simple exercise in effective field theory  

E-Print Network (OSTI)

Muon g - 2 from and e+ e- data ­ a simple exercise in effective field theory ­ Fred Jegerlehner HU function discrepancy. Consequences for the muon g - 2 are discussed. F. Jegerlehner CALC 2012, JINR Dubna, July 29, 2012 #12;Outline of Talk: O Prelude: The hadronic vacuum polarization contribution to the muon

Röder, Beate

448

MUON DECAY PARAMETERS Revised January 2012 by W. Fetscher and H.-J. Gerber (ETH  

E-Print Network (OSTI)

­ 1­ MUON DECAY PARAMETERS Revised January 2012 by W. Fetscher and H.-J. Gerber (ETH Z¨urich). Introduction: All measurements in direct muon decay, µ- e- + 2 neutrals, and its inverse, µ + e- µ- + neutral on muon decay are valid for the leptonic tau decays + + ¯e with the replacements mµ m , me m

449

MUON COLLIDER PROGRESS Robert B. Palmer (BNL, Upton, Long Island, New York)  

E-Print Network (OSTI)

MUON COLLIDER PROGRESS Robert B. Palmer (BNL, Upton, Long Island, New York) Abstract A complete scheme for muon production, cooling, ac- celeration and storage in a collider ring is presented. Pa- rameters for two muon colliders are given. Both start with pion production on a mercury target. A capture

McDonald, Kirk

450

Intense Muon Beams for Experiments at Project X  

SciTech Connect

A coherent approach for providing muon beams to several experiments for the intensity-frontier program at Project X is described. Concepts developed for the front end of a muon collider/neutrino factory facility, such as phase rotation and ionization cooling, are applied, but with significant differences. High-intensity experiments typically require high-duty-factor beams pulsed at a time interval commensurate with the muon lifetime. It is challenging to provide large RF voltages at high duty factor, especially in the presence of intense radiation and strong magnetic fields, which may preclude the use of superconducting RF cavities. As an alternative, cavities made of materials such as ultra-pure Al and Be, which become very good –but not super– conductors at cryogenic temperatures, can be used.

C.M. Ankenbrandt, R.P. Johnson, C. Y. Yoshikawa, V.S. Kashikhin, D.V. Neuffer, J. Miller, R.A. Rimmer

2011-03-01T23:59:59.000Z

451

R&D Toward a Neutrino Factory and Muon Collider  

SciTech Connect

There is considerable interest in the use of muon beams to create either an intense source of decay neutrinos aimed at a detector located 3000-7500 km away (a Neutrino Factory), or a Muon Collider that produces high-luminosity collisions at the energy frontier. R&D aimed at producing these facilities has been under way for more than 10 years. This paper will review experimental results from MuCool, MERIT, and MICE and indicate the extent to which they will provide proof-of-principle demonstrations of the key technologies required for a Neutrino Factory or Muon Collider. Progress in constructing components for the MICE experiment will also be described.

Zisman, Michael S

2009-04-29T23:59:59.000Z

452

Nuclear Waste Imaging and Spent Fuel Verification by Muon Tomography  

E-Print Network (OSTI)

This paper explores the use of cosmic ray muons to image the contents of shielded containers and detect high-Z special nuclear materials inside them. Cosmic ray muons are a naturally occurring form of radiation, are highly penetrating and exhibit large scattering angles on high Z materials. Specifically, we investigated how radiographic and tomographic techniques can be effective for non-invasive nuclear waste characterization and for nuclear material accountancy of spent fuel inside dry storage containers. We show that the tracking of individual muons, as they enter and exit a structure, can potentially improve the accuracy and availability of data on nuclear waste and the contents of Dry Storage Containers (DSC) used for spent fuel storage at CANDU plants. This could be achieved in near real time, with the potential for unattended and remotely monitored operations. We show that the expected sensitivity, in the case of the DSC, exceeds the IAEA detection target for nuclear material accountancy.

Jonkmans, G; Jewett, C; Thompson, M

2012-01-01T23:59:59.000Z

453

A Staged Muon Accelerator Facility For Neutrino and Collider Physics  

E-Print Network (OSTI)

Muon-based facilities offer unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders. They rely on a novel technology with challenging parameters, for which the feasibility is currently being evaluated by the Muon Accelerator Program (MAP). A realistic scenario for a complementary series of staged facilities with increasing complexity and significant physics potential at each stage has been developed. It takes advantage of and leverages the capabilities already planned for Fermilab, especially the strategy for long-term improvement of the accelerator complex being initiated with the Proton Improvement Plan (PIP-II) and the Long Baseline Neutrino Facility (LBNF). Each stage is designed to provide an R&D platform to validate the technologies required for subsequent stages. The rationale and sequence of the staging process and the critical issues to be addressed at each stage, are presented.

Delahaye, Jean-Pierre; Brice, Stephen; Bross, Alan David; Denisov, Dmitri; Eichten, Estia; Holmes, Stephen; Lipton, Ronald; Neuffer, David; Palmer, Mark Alan; Bogacz, S Alex; Huber, Patrick; Kaplan, Daniel M; Snopok, Pavel; Kirk, Harold G; Palmer, Robert B; Ryne, Robert D

2015-01-01T23:59:59.000Z

454

Multipass Arc Lattice Design for Recirculating Linac Muon Accelerators  

SciTech Connect

Recirculating linear accelerators (RLA) are the most likely means to achieve rapid acceleration of short-lived muons to multi-GeV energies required for Neutrino Factories and TeV energies required for Muon Colliders. A drawback of this scheme is that a separate return arc is required for each passage of the muons through the linac. In the work described here, a novel arc optics based on a Non-Scaling Fixed Field Alternating Gradient (NSFFAG) lattice is developed, which would provide sufficient momentum acceptance to allow multiple passes (two or more consecutive energies) to be transported in one string of magnets. An RLA with significantly fewer arcs will reduce the cost. We will develop the optics and technical requirements to allow the maximum number of passes by using an adjustable path length to accurately control the returned beam to synchronize with the linac RF phase.

G.M. Wang, R.P. Johnson, S.A. Bogacz, D. Trbojevic

2009-05-01T23:59:59.000Z

455

Progress on a Cavity with Beryllium Walls for Muon Ionization Cooling Channel R&D.  

SciTech Connect

The Muon Accelerator Program (MAP) collaboration is working to develop an ionization cooling channel for muon beams. An ionization cooling channel requires the operation of high-gradient, normal-conducting RF cavities in multi-Tesla solenoidal magnetic fields. However, experiments conducted at Fermilab?s MuCool Test Area (MTA) show that increasing the solenoidal field strength reduces the maximum achievable cavity gradient. This gradient limit is characterized by an RF breakdown process that has caused significant damage to copper cavity interiors. The damage may be caused by field-emitted electrons, focused by the solenoidal magnetic field onto small areas of the inner cavity surface. Local heating may then induce material fatigue and surface damage. Fabricating a cavity with beryllium walls would mitigate this damage due to beryllium?s low density, low thermal expansion, and high electrical and thermal conductivity. We address the design and fabrication of a pillbox RF cavity with beryllium walls, in order to evaluate the performance of high-gradient cavities in strong magnetic fields.

Bowring, D.L.; DeMello, A.J.; Lambert, A.R.; Li, D.; Virostek,, S.; Zisman, M.; Kaplan, D.; Palmer, R.B.

2012-05-20T23:59:59.000Z

456

R&D Proposal for the National Muon Acccelerator Program  

SciTech Connect

This document contains a description of a multi-year national R&D program aimed at completing a Design Feasibility Study (DFS) for a Muon Collider and, with international participation, a Reference Design Report (RDR) for a muon-based Neutrino Factory. It also includes the supporting component development and experimental efforts that will inform the design studies and permit an initial down-selection of candidate technologies for the ionization cooling and acceleration systems. We intend to carry out this plan with participants from the host national laboratory (Fermilab), those from collaborating U.S. national laboratories (ANL, BNL, Jlab, LBNL, and SNAL), and those from a number of other U.S. laboratories, universities, and SBIR companies. The R&D program that we propose will provide the HEP community with detailed information on future facilities based on intense beams of muons - the Muon Collider and the Neutrino Factory. We believe that these facilities offer the promise of extraordinary physics capabilities. The Muon Collider presents a powerful option to explore the energy frontier and the Neutrino Factory gives the opportunity to perform the most sensitive neutrino oscillation experiments possible, while also opening expanded avenues for the study of new physics in the neutrino sector. The synergy between the two facilities presents the opportunity for an extremely broad physics program and a unique pathway in accelerator facilities. Our work will give clear answers to the questions of expected capabilities and performance of these muon-based facilities, and will provide defensible ranges for their cost. This information, together with the physics insights gained from the next-generation neutrino and LHC experiments, will allow the HEP community to make well-informed decisions regarding the optimal choice of new facilities. We believe that this work is a critical part of any broad strategic program in accelerator R&D and, as the P5 panel has recently indicated, is essential for the long-term health of high-energy physics.

Not Available

2010-02-01T23:59:59.000Z

457

R&D PROPOSAL FOR THE NATIONAL MUON ACCELERATOR PROGRAM  

SciTech Connect

This document contains a description of a multi-year national R&D program aimed at completing a Design Feasibility Study (DFS) for a Muon Collider and, with international participation, a Reference Design Report (RDR) for a muon-based Neutrino Factory. It also includes the supporting component development and experimental efforts that will inform the design studies and permit an initial down-selection of candidate technologies for the ionization cooling and acceleration systems. We intend to carry out this plan with participants from the host national laboratory (Fermilab), those from collaborating U.S. national laboratories (ANL, BNL, Jlab, LBNL, and SNAL), and those from a number of other U.S. laboratories, universities, and SBIR companies. The R&D program that we propose will provide the HEP community with detailed information on future facilities based on intense beams of muons--the Muon Collider and the Neutrino Factory. We believe that these facilities offer the promise of extraordinary physics capabilities. The Muon Collider presents a powerful option to explore the energy frontier and the Neutrino Factory gives the opportunity to perform the most sensitive neutrino oscillation experiments possible, while also opening expanded avenues for the study of new physics in the neutrino sector. The synergy between the two facilities presents the opportunity for an extremely broad physics program and a unique pathway in accelerator facilities. Our work will give clear answers to the questions of expected capabilities and performance of these muon-based facilities, and will provide defensible ranges for their cost. This information, together with the physics insights gained from the next-generation neutrino and LHC experiments, will allow the HEP community to make well-informed decisions regarding the optimal choice of new facilities. We believe that this work is a critical part of any broad strategic program in accelerator R&D and, as the P5 panel has recently indicated, is essential for the long-term health of high-energy physics.

Muon Accelerator Program; Zisman, Michael S.; Geer, Stephen

2010-02-24T23:59:59.000Z

458

Muon Bremsstrahlung and Muonic Pair Production in Air Showers  

E-Print Network (OSTI)

The objective of this work is to report on the modifications in air shower development due to muon bremsstrahlung and muonic pair production. In order to do that we have implemented new muon bremsstrahlung and muonic pair production procedures in the AIRES air shower simulation system, and have used it to simulate ultra high energy showers in different conditions. The influence of the mentioned processes in the global development of the air shower is important for primary particles of large zenith angles, while they do not introduce significant changes in the position of the shower maximum.

A. Cillis; S. J. Sciutto

2000-06-08T23:59:59.000Z

459

New facts about muon production in Extended Air Shower simulations  

E-Print Network (OSTI)

Whereas air shower simulations are very valuable tools for interpreting cosmic ray data, there is a long standing problem: is seems to be impossible to accommodate at the same time the longitudinal development of air showers and the number of muons measured at ground. Using a new hadronic interaction model (EPOS) in air shower simulations produces considerably more muons, in agreement with results from the HiRes-MIA experiment. We find that this is mainly due to a better description of baryon-antibaryon production in hadronic interactions. This is a new aspect of air shower physics which has never been considered so far.

T. Pierog; K. Werner

2006-11-09T23:59:59.000Z

460

PROGRESS IN DESIGNING A MUON COOLING RING WITH LITHIUM LENSES.  

SciTech Connect

We discuss particle tracking simulations in a storage ring with lithium lens inserts designed for the six-dimensional phase space cooling of muons by the ionization cooling. The ring design contains one or more lithium lens absorbers for transverse cooling that transmit the beam with very small beta-function values, in addition to liquid-hydrogen wedge-shaped absorbers in dispersive locations for longitudinal cooling. Such a ring could comprise the final component of a cooling system for use in a muon collider. The beam matching between dipole-quadrupole lattices and the lithium lenses is of particular interest.

FUKUI,Y.CLINE,D.B.GARREN,A.A.KIRK,H.G.

2004-03-03T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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

Charge recombination in the muon collider cooling channel  

SciTech Connect

The final stage of the ionization cooling channel for the muon collider must transversely recombine the positively and negatively charged bunches into a single beam before the muons can be accelerated. It is particularly important to minimize any emittance growth in this system since no further cooling takes place before the bunches are collided. We have found that emittance growth could be minimized by using symmetric pairs of bent solenoids and careful matching. We show that a practical design can be found that has transmission {approx}99%, emittance growth less than 0.1%, and minimal dispersion in the recombined bunches.

Fernow, R. C.; Palmer, R. B. [Physics Department, Brookhaven National Laboratory, Upton, NY 11973 (United States)

2012-12-21T23:59:59.000Z

462

Tapered Six-Dimensional Cooling Channel for a Muon Collider  

SciTech Connect

A high-luminosity muon collider requires a reduction of the six-dimensional emittance of the captured muon beam by a factor of {approx} 10{sup 6}. Most of this cooling takes place in a dispersive channel that simultaneously reduces all six phase space dimensions. We describe a tapered 6D cooling channel that should meet the requirements of a muon collider. The parameters of the channel are given and preliminary simulations are shown of the expected performance. A complete scheme for cooling a muon beam sufficiently for use in a muon collider has been previously described. This scheme uses separate 6D ionization cooling channels for the two signs of the particle charge. In each, a channel first reduces the emittance of a train of muon bunches until they can be injected into a bunch-merging system. The single muon bunches, one of each sign, are then sent through a second tapered 6D cooling channel where the transverse emittance is reduced as much as possible and the longitudinal emittance is cooled to a value below that needed for the collider. The beam can then be recombined and sent through a final cooling channel using high-field solenoids that cools the transverse emittance to the required values for the collider while allowing the longitudinal emittance to grow. This paper mainly describes the design of the 6D cooling channel before bunch merging. Cooling efficiency is conveniently measured using a parameter Q, which is defined as the rate of change of 6D emittance divided by the rate of change of the number of muons in the beam. In a given lattice Q starts off small due to losses from initial matching, then rises to a large value (Q {approx} 15 is typical for the channels discussed here), and finally falls as the emittance of the beam approaches its equilibrium value. The idea for the 6D cooling channel described here originated with the RFOFO cooling ring. This design evolved into a helical channel referred to as a 'Guggenheim' in order to avoid serious problems with injection of large emittance beams. We found that good cooling efficiency requires that the channel be tapered. In that case when Q starts to fall off the lattice is modified to reduce the beta function. This ensures that the beam emittance is always large compared with the equilibrium emittance.

Palmer, R.B.; Fernow, R.C.

2011-03-28T23:59:59.000Z

463

Pade approximants and g-2 for the muon  

E-Print Network (OSTI)

The leading hadronic contribution to the muon anomalous magnetic moment is given by a weighted euclidean momentum integral of the hadronic vacuum polarization. This integral is dominated by momenta of order the muon mass. Since in lattice QCD it is difficult to compute the vacuum polarization at a large number of low momenta, a parametrization of the vacuum polarization is required to extrapolate the data. Most fits to date are based on vector meson dominance, which introduces model dependence into the lattice computation of the magnetic moment. Here we introduce a model-independent extrapolation method, and present a few first tests of this new method.

Christopher Aubin; Thomas Blum; Maarten Golterman; Santiago Peris

2012-10-29T23:59:59.000Z

464

Muon g-2 Anomaly and Dark Leptonic Gauge Boson  

SciTech Connect

One of the major motivations to search for a dark gauge boson of MeV-GeV scale is the long-standing muon g-2 anomaly. Because of active searches such as fixed target experiments and rare meson decays, the muon g-2 favored parameter region has been rapidly reduced. With the most recent data, it is practically excluded now in the popular dark photon model. We overview the issue and investigate a potentially alternative model based on the gauged lepton number or U(1)_L, which is under different experimental constraints.

Lee, Hye-Sung [W& M

2014-11-01T23:59:59.000Z

465

Prospects for all-optical ultrafast muon acceleration  

E-Print Network (OSTI)

A scheme for fast, compact, and controllable acceleration of heavy particles in vacuum has been recently proposed [F. Peano et al., New J. Phys. 10 033028 (2008)], wherein two counterpropagating laser beams with variable frequencies drive a beat-wave structure with variable phase velocity, leading to particle trapping and acceleration. The technique allows for fine control over the energy distribution and the total charge of the accelerated beam, to be obtained via tuning of the frequency variation. Here, the theoretical bases of the acceleration scheme are described, and the possibility of applications to ultrafast muon acceleration and to the prompt extraction of cold-muon beams is discussed.

Peano, F; Mulas, R; Coppa, G; Bingham, R; Silva, L O

2008-01-01T23:59:59.000Z

466

Gases for an SSC muon detector  

SciTech Connect

Recent measurements of electron drift velocities as a function of the density-reduced electric field E/N are reported for a number of unitary gases and the mixtures CO{sub 2}/CH{sub 4} and NH{sub 3}/CF{sub 4}/Ar. Calculated values of the mean electron energy as a function of E/N are also reported for unitary gases and mixtures of CO{sub 2}/CH{sub 4}. 7 refs., 5 figs.

Christophorou, L.G.; Datskos, P.G.; Carter, J.G. (Oak Ridge National Lab., TN (USA) Tennessee Univ., Knoxville, TN (USA). Dept. of Physics and Astronomy)

1990-01-01T23:59:59.000Z

467

Design and testing of the New Muon Lab cryogenic system at Fermilab  

SciTech Connect

Fermi National Accelerator Laboratory is constructing a superconducting 1.3 GHz cryomodule test facility located at the New Muon Lab building. The facility will be used for testing and validating cryomodule designs as well as support systems. For the initial phase of the project, a single Type III plus 1.3 GHz cryomodule will be cooled and tested using a single Tevatron style standalone refrigerator. Subsequent phases involve testing as many as two full RF units consisting of up to six 1.3 GHz cryomodules with the addition of a new cryogenic plant. The cryogenic infrastructure consists of the refrigerator system, cryogenic distribution system as well as an ambient temperature pumping system to achieve 2 K operations with supporting purification systems. A discussion of the available capacity for the various phases versus the proposed heat loads is included as well as commissioning results and testing schedule. This paper describes the plans, status and challenges of this initial phase of the New Muon Lab cryogenic system.

Martinez, A.; Klebaner, A.L.; Theilacker, J.C.; DeGraff, B.D.; Leibfritz, J.; /Fermilab

2009-11-01T23:59:59.000Z

468

Muon Spin Spectroscopy of the Nematic Liquid Crystal 4-n-Pentyl-4?-cyanobiphenyl (5CB)  

Science Journals Connector (OSTI)

(22, 23) These techniques involve injecting spin-polarized positive muons into a sample and detecting the positron produced by the decay of each muon. ... The field dependence of the muon polarization due to a ?0 resonance in the I phase is given by(28) where fR is the fraction of muons that have formed the radical; N is the dimension of the spin matrix; ? is the muon spin relaxation rate (1/T1?); and ?r is the ALC transition frequency, which is given by ... Roduner, E. In Muon Science: Muons in Physics, Chemistry and Materials (Scottish Universities Summer School in Physics); Lee, S. L.; Cywinski, R.; Kilcoyne, S. H., Eds.; Taylor and Francis Group: Abingdon, 1999; pp 173? 209. ...

Iain McKenzie; Herbert Dilger; Alexey Stoykov; Robert Scheuermann

2009-07-06T23:59:59.000Z

469

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER  

E-Print Network (OSTI)

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER (IPAC12, WEPPD038) The target station a 15-20 T superconducting magnet. The target itself is a free mercury jet, moving at 20 m/s at an small angle to the magnetic axis, so as later to be collected in a mercury pool/beam dump. The replaceable

McDonald, Kirk

470

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER  

E-Print Network (OSTI)

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER Van Graves , ORNL, Oak Ridge, TN 37830 Factory is a free-stream mercury jet within a 20-T magnetic field being impacted by an 8-GeV proton beam. A pool of mercury serves as a receiving reservoir for the mercury and a dump for the unexpended proton

McDonald, Kirk

471

High-energy muons in extensive air showers  

Science Journals Connector (OSTI)

A study has been made of the density of high-energy muons (10

W. S. Rada; A. C. Smith; T. R. Stewart; M. G. Thompson…

1979-11-21T23:59:59.000Z

472

High-energy cosmic ray muons in the Earth's atmosphere  

SciTech Connect

We present the calculations of the atmospheric muon fluxes at energies 10-10{sup 7} GeV based on a numerical-analytical method for solving the hadron-nucleus cascade equations. It allows the non-power-law behavior of the primary cosmic ray (PCR) spectrum, the violation of Feynman scaling, and the growth of the total inelastic cross sections for hadron-nucleus collisions with increasing energy to be taken into account. The calculations have been performed for a wide class of hadron-nucleus interaction models using directly the PCR measurements made in the ATIC-2 and GAMMA experiments and the parameterizations of the primary spectrum based on a set of experiments. We study the dependence of atmospheric muon flux characteristics on the hadronic interaction model and the influence of uncertainties in the PCR spectrum and composition on the muon flux at sea level. Comparison of the calculated muon energy spectra at sea level with the data from a large number of experiments shows that the cross sections for hadron-nucleus interactions introduce the greatest uncertainty in the energy region that does not include the knee in the primary spectrum.

Kochanov, A. A., E-mail: kochanov@iszf.irk.ru [Russian Academy of Sciences, Siberian Branch, Institute of Solar-Terrestrial Physics (Russian Federation); Sinegovskaya, T. S. [Irkutsk State Railway University (Russian Federation)] [Irkutsk State Railway University (Russian Federation); Sinegovsky, S. I., E-mail: sinegovsky@api.isu.ru [Irkutsk State University (Russian Federation)

2013-03-15T23:59:59.000Z

473

Calculation of low-energy atmospheric muon flux  

Science Journals Connector (OSTI)

We report the results of a three-dimensional Monte Carlo calculation of the low-energy atmospheric muon flux. They agree with the experiments by Allkofer et al. at sea level, but the agreement with the experiments by Conversi at a high altitude is not good, particularly at a very high altitude.

Haeshim Lee and Sidney A. Bludman

1988-11-01T23:59:59.000Z

474

Simulation of neutrons produced by high-energy muons underground  

Science Journals Connector (OSTI)

This article describes the Monte Carlo simulation used to interpret the measurement of the muon-induced neutron flux in the Boulby Underground Laboratory (North Yorkshire, UK), recently performed using a large scintillator veto deployed around the ZEPLIN-II WIMP detector. Version 8.2 of the GEANT4 toolkit was used after relevant benchmarking and validation of neutron production models. In the direct comparison between Monte Carlo and experimental data, we find that the simulation produces a 1.8 times higher neutron rate, which we interpret as over-production in lead by GEANT4. The dominance of this material in neutron production allows us to estimate the absolute neutron yield in lead as (1.31 ± 0.06)×10?3 neutrons/muon/(g/cm2) for a mean muon energy of 260 GeV. Simulated nuclear recoils due to muon-induced neutrons in the ZEPLIN-II target volume (?1-year exposure) showed that, although a small rate of events is expected from this source of background in the energy range of interest for dark matter searches, no event survives an anti-coincidence cut with the veto.

A. Lindote; H.M. Araújo; V.A. Kudryavtsev; M. Robinson

2009-01-01T23:59:59.000Z

475

Nuclear interactions produced by high-energy muons  

Science Journals Connector (OSTI)

Penetrating showers produced in iron plates of a multiplate cloud chamber by muons at 148 m w.e. underground are ... and Kessler. The observed cross-sections for energy transfers in the range (1?8)...?28 cm2 per ...

N. Chaudhuri; M. S. Sinha

1968-01-21T23:59:59.000Z

476

Neutrino factory front-end: muon capture and cooling optimization  

E-Print Network (OSTI)

The neutrino factory is one of the designs proposed for a future intense neutrino beam facility. The layout discussed here focuses on the front-end of the current baseline. The challenges inherent to the cooling of muons are shown together with possible baseline optimization.

Prior, G

2010-01-01T23:59:59.000Z

477

Muon Capture in Hyperfine States of Muonic Deuterium  

Science Journals Connector (OSTI)

......investigation on the weak nuclear exchange current in the muon...I) This is because the nuclear structure is simple, and therefore different nuclear models, such as those with...previous work/) we studied the energy spectrum of the emitted neutron......

Makoto Doi; Toru Sato; Hisao Ohtsubo; Masato Morita

1991-07-01T23:59:59.000Z

478

Standard Model Predictions for the Muon $(g-2)/2$  

E-Print Network (OSTI)

The current status of the Standard Model predictions for the muon anomalous magnetic moment is described. Various contributions expected in the Standard Model are discussed. After the reevaluation of the leading-order hadronic term based on the new \\ep data, the theoretical prediction is more than three standard deviations lower than the experimental value.

S. I. Eidelman

2009-04-21T23:59:59.000Z

479

Muon g-2 ring moving up Illinois river  

SciTech Connect

This clip shows the "Miss Katie" pushing the muon g-2 ring upstream on the Illinois River, and passing through the Peoria Lock and Dam as it travels toward Lemont, where it will be unloaded onto the special Emmert transporter and driven to Fermilab.

none

2013-07-20T23:59:59.000Z

480

Structure of negatively charged muonium in n-type GaAs  

Science Journals Connector (OSTI)

Muon level-crossing resonance and muon-spin-rotation measurements on heavily doped n-type GaAs:Si and GaAs:Te show that the majority of positive muons implanted at room temperature form an isolated diamagnetic muonium center located at a high-symmetry site with Ga neighbors along the ?111? direction(s). These experiments, together with theoretical considerations, imply that negatively charged muonium is at or near the tetrahedral interstitial site with four Ga nearest-neighbor atoms. Except for zero-point energy differences, these results should model negatively charged isolated hydrogen in GaAs.

K.H. Chow; R.F. Kiefl; W.A. MacFarlane; J.W. Schneider; D.W. Cooke; M. Leon; M. Paciotti; T.L. Estle; B. Hitti; R.L. Lichti; S.F.J. Cox; C. Schwab; E.A. Davis; A. Morrobel-Sosa; L. Zavieh

1995-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "types electron muon" 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.


481

Muon Spin Rotation and Mössbauer Investigations of the Spin Transition in [Fe(ptz)6](ClO4)2  

Science Journals Connector (OSTI)

Muon Spin Rotation and Mössbauer Investigations of the Spin Transition in [Fe(ptz)6](ClO4)2? ... The muons decay with a mean lifetime of 2.2 ?s and emit positrons preferentially in the direction of the muon spin. ... (c) Muon Science: Muons in Physics, Chemistry and Solids, (Eds. ...

S. J. Campbell; V. Ksenofontov; Y. Garcia; J. S. Lord; Y. Boland; P. Gütlich

2003-11-26T23:59:59.000Z

482

Investigation of the solar influence on the cosmic muon flux using WILLI detector  

SciTech Connect

A fesibility study to explore the capability of the WILLI detector to observe the solar events/activity by recording the muon intensity at ground level is presented.The WILLI detector, set up in National Institute of Physics and Nuclear Engineering, Bucharest, is a 1 m{sup 2} incident area sampling calorimeter. It can measure simultaneously muon events with the muon energy {>=}0.4 GeV and, if the muons are stopped in the detector, and muon energy between 0.4muons pass the minimum of 2 plates of the detector stack.Taking into account muon events with energy {>=}0.4 GeV, a modulation of the muon intensity as a diurnal variation is observed. Muon events for a smaller energy range (0.4-0.6 GeV) seem to exhibit an aperiodic variation of the muon intensity, which could be correlated with magnetic activity indicated by the planetary K{sub p} index.

Saftoiu, A.; Brancus, I. M.; Duma, M.; Mitrica, B.; Petcu, M.; Toma, G. [National Institute of Physics and Nuclear Engineering Bucharest (Romania); Bercuci, A.; Haungs, A.; Rebel, H. [Institut fuer Kernphysik, Karlsruher Institut fuer Technologie (Germany); Sima, O. [Department of Physics, University of Bucharest (Romania)

2010-11-24T23:59:59.000Z

483

Calculation of two-centre two-electron integrals over Slater-type orbitals revisited. III. Case study of the beryllium dimer  

E-Print Network (OSTI)

In this paper we present results of ab-initio calculations for the beryllium dimer with basis set of Slater-type orbitals (STOs). Nonrelativistic interaction energy of the system is determined using the frozen-core full configuration interaction calculations combined with high-level coupled cluster correction for inner-shell effects. Newly developed STOs basis sets, ranging in quality from double to sextuple zeta, are used in these computations. Principles of their construction are discussed and several atomic benchmarks are presented. Relativistic effects of order ${\\alpha}^2$ are calculated perturbatively by using the Breit-Pauli Hamiltonian and are found to be significant. We also estimate the leading-order QED effects. Influence of the adiabatic correction is found to be negligible. Finally, the interaction energy of the beryllium dimer is determined to be 929.0$\\,\\pm\\,$1.9 $cm^{-1}$, in a very good agreement with the recent experimental value. The results presented here appear to be the most accurate ab-initio calculations for the beryllium dimer available in the literature up to date and probably also one of the most accurate calculations for molecular systems containing more than four electrons.

Micha? Lesiuk; Micha? Przybytek; Monika Musia?; Bogumi? Jeziorski; Robert Moszynski

2014-10-22T23:59:59.000Z

484

Electronic and transport properties of polycrystalline Ba{sub 8}Ga{sub 15}Ge{sub 31} type I clathrate prepared by SPS method  

SciTech Connect

Samples of germanium Ba{sub 8}Ga{sub 15}Ge{sub 31} clathrate of type I were prepared using standard metallurgy methods. The structure, microstructure and phase composition of the prepared samples were analyzed by powder X-ray diffraction XRD and scanning electron microscope SEM combined with energy dispersive X-ray analysis EDX. Scanning thermoelectric microprobe STMP was used to characterize uniformity of Seebeck coefficient distribution at different stages of the material synthesis in order to optimize the synthesis method. Electrical conductivity, Seebeck coefficient and thermal conductivity were measured in the temperature range 20-450 Degree-Sign C. Based on the measured electrical properties and Hall carrier concentration n=5-9{center_dot}10{sup 20} cm{sup -3} at room temperature, electron effective mass m{sup Low-Asterisk} was estimated to be between 2.1-3 m{sub 0}. Preliminary FP-LAPW DFT calculations were performed for two chosen high symmetry superstructures Ba{sub 8}Ga{sub 16}Ge{sub 30} and Ba{sub 8}Ga{sub 6}Ge{sub 40} by means of WIEN2K package. Additionally topological analysis of total electron density according to Bader's Quantum Theory of Atoms in Molecules was carried out. The energy band gaps were calculated to be 0.3 eV for Ba{sub 8}Ga{sub 16}Ge{sub 30} and 0.38 eV for Ba{sub 8}Ga{sub 6}Ge{sub 40} which was close to the experimental results for Ba{sub 8}Ga{sub 16}Ge{sub 30}. The observed electrical properties were compared with the electronic band structure calculations, showing good qualitative correlation between the measured transport properties and the theoretical predictions. - Graphical abstract: Scanning thermoelectric microprobe STMP was used to investigate uniformity of the prepared polycrystalline Ba{sub 8}Ga{sub 15}Ge{sub 31} clathrate samples at different synthesis stages. Maps and histograms of the Seebeck coefficient distribution (presented in the picture) for Ba{sub 8}Ga{sub 15}Ge{sub 31} ingot after the first synthesis stage showed it is not uniform. The Seebeck coefficient distribution in the ingot was bimodal. The same analysis for the sample after annealing and sintering showed that the Seebeck coefficient distribution is unimodal. Compared to the ingot from I synthesis stage a significant improvement of material uniformity was observed. Highlights: Black-Right-Pointing-Pointer Scanning thermoelectric microprobe STMP measurements show important uniformity change during sample annealing. Black-Right-Pointing-Pointer Calculated band gap E{sub g} values are close to the reported E{sub g}. Black-Right-Pointing-Pointer Ga/Ge ratio change doesn't affect significantly the bonding properties. Black-Right-Pointing-Pointer Band structure calculations show that bond's character agrees with the Zintl concept.

Leszczynski, J., E-mail: Juliusz.Leszczynski@agh.edu.pl [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Inorganic Chemistry, Thermoelectric Research Laboratory, Krakow (Poland); Kolezynski, A. [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Silicate Chemistry and Macromolecular Compounds, Krakow (Poland)] [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Silicate Chemistry and Macromolecular Compounds, Krakow (Poland); Wojciechowski, K.T. [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Inorganic Chemistry, Thermoelectric Research Laboratory, Krakow (Poland)] [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Inorganic Chemistry, Thermoelectric Research Laboratory, Krakow (Poland)

2012-09-15T23:59:59.000Z

485

Observation of Muon Pairs in High-Energy Hadron Collisions  

Science Journals Connector (OSTI)

Muon pairs with effective masses between 1 GeV/c2 and 6.5 GeV/c2 have been observed in the collisions of 30-GeV protons with a uranium target. The production cross section was seen to vary smoothly with mass exhibiting no resonant structure. Data were taken at incident proton energies of 22, 25, 28.5, and 29.5 GeV. Within the experimental aperture the total cross section increased with energy by a factor of 5. The experimental results are compared with the predictions of several theoretical models. Limits are presented for the contributions to the signal from both massive muon-pair resonances and antiproton-proton annihilation. Implications are presented for higher-energy accelerators, using current ideas involving scaling.

J. H. Christenson, G. S. Hicks, L. M. Lederman, P. J. Limon, B. G. Pope, and E. Zavattini

1973-10-01T23:59:59.000Z

486

Mean excitation energies in the nuclear muon capture  

Science Journals Connector (OSTI)

The parametrization of the total muon capture rates in terms of a mean nuclear excitation energy E¯?, proposed in a recent letter of Christillin, Dellafiore, and Rosa-Clot (CDR), is examined. We show that this parametrization ignores the importance of the allowed transitions in light nuclei and fails to reproduce the experimentally observed trend of the T> giant resonance energy as a function of nuclear mass number. The removal of contributions due to higher multipoles in heavier nuclei aggravates this discrepancy. The failure of E¯?, extracted by CDR, to correspond to physically meaningful nuclear excitation energies in heavier nuclei is attributable to the intrinsic arbitrariness in its definition, and to the oversimplifying assumption of the nuclear Hamiltonian to be a sum of kinetic energy and Wigner potential alone. A first-order improvement of the Primakoff approximation is discussed.NUCLEAR REACTIONS ?-+A(N,Z)?v+A(N+1,Z-1); muon capture; closure approximation; mean nuclear excitation energies.

Francesco Cannata and Nimai C. Mukhopadhyay

1974-07-01T23:59:59.000Z

487

RECENT PROGRESS TOWARD A MUON RECIRCULATING LINEAR ACCELERATOR  

SciTech Connect

Both Neutrino Factories (NF) and Muon Colliders (MC) require very rapid acceleration due to the short lifetime of muons. After a capture and bunching section, a linac raises the energy to about 900 MeV, and is followed by one or more Recirculating Linear Accelerators (RLA), possibly followed by a Rapid Cycling Synchnotron (RCS) or Fixed-Field Alternating Gradient (FFAG) ring. A RLA reuses the expensive RF linac section for a number of passes at the price of having to deal with different energies within the same linac. Various techniques including pulsed focusing quadruopoles, beta frequency beating, and multipass arcs have been investigated via simulations to improve the performance and reduce the cost of such RLAs.

Slawomir Bogacz, Vasiliy Morozov, Yves Roblin, Kevin Beard

2012-07-01T23:59:59.000Z

488

Radiative muon capture rates and the maximum photon energy  

Science Journals Connector (OSTI)

The differential photon spectrum for radiative muon capture is expanded about the average maximum photon energy km and the correction terms evaluated using for one a modified Thomas-Reiche-Kuhn sum rule, thus extending previous work for ordinary capture. The resulting rate is much less dependent on km than the usual closure result. The ratio km? appropriate for closure calculations, with ? the average neutrino energy, is determined and found to be approximately constant and, when correction terms are included, somewhat higher than values previously used. By similar techniques a consistency relation is derived which can be solved to explicitly estimate "physical" values of km and ?.NUCLEAR REACTIONS Radiative muon capture. Differential photon spectrum, relative rate for Ca40. Dipole sum rules used to correct closure approximation, obtain estimates of mean excitation energy, average maximum photon energy.

R. S. Sloboda and Harold W. Fearing

1978-11-01T23:59:59.000Z

489

Hydrogen-filled RF Cavities for Muon Beam Cooling  

SciTech Connect

Ionization cooling requires low-Z energy absorbers immersed in a strong magnetic field and high-gradient, large-aperture RF cavities to be able to cool a muon beam as quickly as the short muon lifetime requires. RF cavities that operate in vacuum are vulnerable to dark-current- generated breakdown, which is exacerbated by strong magnetic fields, and they require extra safety windows that degrade cooling, to separate RF regions from hydrogen energy absorbers. RF cavities pressurized with dense hydrogen gas will be developed that use the same gas volume to provide the energy absorber and the RF acceleration needed for ionization cooling. The breakdown suppression by the dense gas will allow the cavities to operate in strong magnetic fields. Measurements of the operation of such a cavity will be made as functions of external magnetic field and charged particle beam intensity and compared with models to understand the characteristics of this technology and to develop mitigating strategies if necessary.

CHARLES, Ankenbrandt

2009-04-17T23:59:59.000Z

490

GPD physics with polarized muon beams at COMPASS-II  

SciTech Connect

A major part of the future COMPASS program is dedicated to the investigation of the nucleon structure through Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP). COMPASS will measure DVCS and DVMP reactions with a high intensity muon beam of 160 GeV and a 2.5 m-long liquid hydrogen target surrounded by a new TOF system. The availability of muon beams with high energy and opposite charge and polarization will allow to access the Compton form factor related to the dominant GPD H and to study the x{sub B}-dependence of the t-slope of the pure DVCS cross section and to study nucleon tomography. Projections on the achievable accuracies and preliminary results of pilot measurements will be presented.

Ferrero, Andrea [CEA-Saclay, DSM/Irfu/SpHN, 91191 Gif-sur-Yvette (France); Collaboration: COMPASS Collaboration

2013-04-15T23:59:59.000Z

491

The Case for Muon-based Neutrino Beams  

E-Print Network (OSTI)

For the foreseeable future, high energy physics accelerator capabilities in the US will be deployed to study the physics of the neutrino sector. In this context, it is useful to explore the sensitivities and limiting systematic effects of the planned neutrino oscillation program, so that we can evaluate the issues that must be addressed in order to ensure the success of these efforts. It is only in this way that we will ultimately be able to elucidate the fundamental physics processes involved. We conclude that success can only be guaranteed by, at some point in the future, being able to deploy muon accelerator capabilities. Such capabilities provide the only route to precision neutrino beams with which to study and mitigate, at the sub-percent level, the limiting systematic issues of future oscillation measurements. Thus this analysis argues strongly for maintaining a viable accelerator research program towards future muon accelerator capabilities.

Huber, Patrick; Palmer, Mark

2014-01-01T23:59:59.000Z

492

Reducing backgrounds in the higgs factory muon collider detector  

SciTech Connect

A preliminary design of the 125-GeV Higgs Factory (HF) Muon Collider (MC) has identified an enormous background loads on the HF detector. This is related to the twelve times higher muon decay probability at HF compared to that previously studied for the 1.5-TeV MC. As a result of MARS15 optimization studies, it is shown that with a carefully designed protection system in the interaction region, in the machine-detector interface and inside the detector one can reduce the background rates to a manageable level similar to that achieved for the optimized 1.5-TeV case. The main characteristics of the HF detector background are presented for the configuration found.

Mokhov, N. V.; Tropin, I. S.

2014-06-01T23:59:59.000Z

493

The scattering of muons in low Z materials  

E-Print Network (OSTI)

This paper presents the measurement of the scattering of 172 MeV/c muons in assorted materials, including liquid hydrogen, motivated by the need to understand ionisation cooling for muon acceleration. Data are compared with predictions from the Geant 4 simulation code and this simulation is used to deconvolute detector effects. The scattering distributions obtained are compared with the Moliere theory of multiple scattering and, in the case of liquid hydrogen, with ELMS. With the exception of ELMS, none of the models are found to provide a good description of the data. The results suggest that ionisation cooling will work better than would be predicted by Geant 4.7.0p01.

Attwood, D; Benveniste, S; Bogacz, A; Bull, S; Cline, D; Curtis-Rouse, M; Edgecock, T R; Ellis, M; Fernow, R; Fukui, Y; Gruber, P; Holmes, S; Ishida, K; Jamdagni, A; Lee, K; Lidbury, J; Long, K; Marshall, G M; Matsuda, Y; McKigney, E; McMahon, T; Murray, W J; Nagamine, K; Nakamura, S; Norton, P; Peach, Kenneth J; Pischalnikov, Y; Savage, P; Wilson, J

2006-01-01T23:59:59.000Z

494

Correcting Aberrations in Complex Magnet Systems for Muon Cooling Channels  

SciTech Connect

Designing and simulating complex magnet systems needed for cooling channels in both neutrino factories and muon colliders requires innovative techniques to correct for both chromatic and spherical aberrations. Optimizing complex systems, such as helical magnets for example, is also difficult but essential. By using COSY INFINITY, a differential algebra based code, the transfer and aberration maps can be examined to discover what critical terms have the greatest influence on these aberrations.

J.A. Maloney, B. Erdelyi, A. Afanaciev, R.P. Johnson, Y.S. Derbenev, V.S. Morozov

2011-03-01T23:59:59.000Z

495

Cosmic Ray Muons Timing in the ATLAS Detector  

Science Journals Connector (OSTI)

In this talk I discuss the use of calorimeter timing both for detector commissioning and in searches for new physics. In particular I present real and simulated cosmic ray muons data (2007) results for the ATLAS Tile Calorimeter system. The analysis shows that several detector errors such as imperfect calibrations can be uncovered. I also demonstrate the use of ATLAS Tile Calorimeter’s excellent timing resolution in suppressing cosmic ray fake missing transverse energy (E T ) in searches for supersymmetry.

Bernhard Meirose; ATLAS Tile Calorimeter System

2009-01-01T23:59:59.000Z

496

Muon-induced backgrounds in the CUORICINO experiment  

E-Print Network (OSTI)

To better understand the contribution of cosmic ray muons to the CUORICINO background, 10 plastic scintillator detectors were installed at the CUORICINO site and operated during the final 3 months of the experiment. From these measurements, an upper limit of 0.0021 counts/(keV kg yr) (95% CL) was obtained on the cosmic ray-induced background in the neutrinoless double beta decay region of interest. The measurements were also compared to Geant4 simulations.

E. Andreotti; C. Arnaboldi; F. T. Avignone III; M. Balata; I. Bandac; M. Barucci; J. W. Beeman; F. Bellini; T. Bloxham; C. Brofferio; A. Bryant; C. Bucci; L. Canonica; S. Capelli; L. Carbone; M. Carrettoni; M. Clemenza; O. Cremonesi; R. J. Creswick; S. Di Domizio; M. J. Dolinski; L. Ejzak; R. Faccini; H. A. Farach; E. Ferri; F. Ferroni; E. Fiorini; L. Foggetta; A. Giachero; L. Gironi; A. Giuliani; P. Gorla; E. Guardincerri; T. D. Gutierrez; E. E. Haller; R. Kadel; K. Kazkaz; S. Kraft; L. Kogler; Yu. G. Kolomensky; C. Maiano; R. H. Maruyama; C. Martinez; M. Martinez; L. Mizouni; S. Morganti; S. Nisi; C. Nones; E. B. Norman; A. Nucciotti; F. Orio; M. Pallavicini; V. Palmieri; L. Pattavina; M. Pavan; M. Pedretti; G. Pessina; S. Pirro; E. Previtali; L. Risegari; C. Rosenfeld; C. Rusconi; C. Salvioni; S. Sangiorgio; D. Schaeffer; N. D. Scielzo; M. Sisti; A. R. Smith; C. Tomei; G. Ventura; M. Vignati

2009-12-18T23:59:59.000Z

497

A Precision Measurement of Nuclear Muon Capture on 3He  

E-Print Network (OSTI)

The muon capture rate in the reaction mu- 3He -> nu + 3H has been measured at PSI using a modular high pressure ionization chamber. The rate corresponding to statistical hyperfine population of the mu-3He atom is (1496.0 +- 4.0) s^-1. This result confirms the PCAC prediction for the pseudoscalar form factors of the 3He-3H system and the nucleon.

P. Ackerbauer; D. V. Balin; V. M. Baturin; G. A. Beer; W. H. Breunlich; T. Case; K. Crowe; H. Daniel; J. Deutsch; J. Govaerts; Yu. S. Grigoriev; F. J. Hartmann; P. Kammel; R. King; B. Lauss; E. M. Maev; V. E. Markushin; J. Marton; M. Muehlbauer; C. Petitjean; Th. Petitjean; G. E. Petrov; R. Prieels; W. Prymas; W. Schott; G. G. Semenchuk; Yu. V. Smirenin; A. A. Vorobyov; N. I. Voropaev; P. Wojciechowski

1997-08-29T23:59:59.000Z

498

Search for high-energy muon neutrinos from the "naked-eye" GRB080319B with the IceCube neutrino telescope  

E-Print Network (OSTI)

California. Search for high-energy muon neutrinos from the “Search for high-energy muon neutrinos from the “naked-eye”IceCube detector for high-energy muon neu- trinos from GRB

Abbasi, R.; IceCube Collaboration

2009-01-01T23:59:59.000Z

499

Limits on a muon flux from Kaluza-Klein dark matter annihilations in the Sun from the IceCube 22-string detector  

E-Print Network (OSTI)

Limits on a muon flux from Kaluza-Klein dark matterAPS/123-QED Limits on a muon ?ux from Kaluza-Klein dark23, 2009) A search for muon neutrinos from Kaluza-Klein dark

Abbasi, R.

2010-01-01T23:59:59.000Z

500

Cosmic-ray Muon Radiography of a Volcano Seismo Seminor at Caltech, Nov 5, 2004  

E-Print Network (OSTI)

of the high-energy cosmic-ray muons passing through a mountain. This technique is in principle, based upon) with a mean energy of a few GeV (109 eV). Such high-energy muons have been used to explore the internal. It is also known that horizontally arriving cosmic-ray muons have a strong intensity in the high energy

Heaton, Thomas H.