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Note: This page contains sample records for the topic "muon anomalous magnetic" from the National Library of EnergyBeta (NLEBeta).
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1

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

2

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

3

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

4

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

5

Lattice Determination of the Anomalous Magnetic Moment of the Muon  

E-Print Network [OSTI]

We compute the leading hadronic contribution to the anomalous magnetic moment of the muon a_mu^HLO using two dynamical flavours of non-perturbatively O(a) improved Wilson fermions. By applying partially twisted boundary conditions we are able to improve the momentum resolution of the vacuum polarisation, an important ingredient for the determination of the leading hadronic contribution. We check systematic uncertainties by studying several ensembles, which allows us to discuss finite size effects and lattice artefacts. The chiral behavior of a_mu^HLO turns out to be non-trivial, especially for small pion masses.

Michele Della Morte; Benjamin Jäger; Andreas Jüttner; Hartmut Wittig

2011-11-09T23:59:59.000Z

6

THE MUON ANOMALOUS MAGNETIC MOMENT Updated July 2011 by A. Hoecker (CERN), and W.J. Marciano  

E-Print Network [OSTI]

� 1� THE MUON ANOMALOUS MAGNETIC MOMENT Updated July 2011 by A. Hoecker (CERN), and W.J. Marciano (BNL). The Dirac equation predicts a muon magnetic moment, M = g� e 2m� S, with gyromagnetic ratio g muon g - 2 reviews, see Refs. [3,4]. The E821 experiment at Brookhaven National Lab (BNL) studied

7

THE MUON ANOMALOUS MAGNETIC MOMENT Updated July 2011 by A. Hoecker (CERN), and W.J. Marciano  

E-Print Network [OSTI]

­ 1­ THE MUON ANOMALOUS MAGNETIC MOMENT Updated July 2011 by A. Hoecker (CERN), and W.J. Marciano (BNL). The Dirac equation predicts a muon magnetic moment, M = gµ e 2mµ S, with gyromagnetic ratio gµ muon g - 2 reviews, see Refs. [3,4]. The E821 experiment at Brookhaven National Lab (BNL) studied

8

Precise Measurement of the Positive Muon Anomalous Magnetic Moment  

E-Print Network [OSTI]

A precise measurement of the anomalous g value, a_mu=(g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a_mu^+=11 659 202(14)(6) X 10^{-10} (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a_mu(SM)=11 659 159.6(6.7) X 10^{-10} (0.57 ppm) and a_mu(exp)-a_mu(SM)=43(16) X 10^{-10} in which a_mu(exp) is the world average experimental value. This difference may be due to physics beyond the standard model.

Brown, H N; Carey, R M; Cushman, P B; Danby, G T; Debevec, P T; Deile, M; Deng, H; Deninger, W J; Dhawan, S K; Druzhinin, V P; Duong, L; Efstathiadis, E F; Farley, Francis J M; Fedotovich, G V; Giron, S; Gray, F; Grigoriev, D; Grosse-Perdekamp, M; Grossmann, A; Hare, M; Hertzog, D W; Hughes, V W; Iwasaki, M; Jungmann, Klaus; Kawall, D; Kawamura, M; Khazin, B I; Kindem, J; Krienen, F; Kronkvist, I J; Larsen, R; Lee, Y Y; Logashenko, I B; McNabb, R; Meng, W; Mi, J; Miller, J P; Morse, W M; Nikas, D; Onderwater, Gerco; Orlov, Yu F; Ozben, C S; Paley, J M; Polly, C; Pretz, J; Prigl, R; zu Putlitz, Gisbert; Redin, S I; Rind, O; Roberts, B L; Ryskulov, N M; Sedykh, S N; Semertzidis, Y K; Shatunov, Yu M; Sichtermann, E P; Solodov, E P; Sossong, M; Steinmetz, A; Sulak, Lawrence R; Timmermans, C; Trofimov, A V; Urner, D; Von Walter, P; Warburton, D; Winn, D; Yamamoto, A; Zimmerman, D

2001-01-01T23:59:59.000Z

9

Pion Pole Contribution to Hadronic Light-By-Light Scattering and Muon Anomalous Magnetic Moment  

Science Journals Connector (OSTI)

We derive an analytic result for the pion pole contribution to the light-by-light scattering correction to the anomalous magnetic moment of the muon, a?=(g?-2)/2. Using the vector meson dominance model for the pion transition form factor, we obtain a?LBL,?0=+56×10-11.

Ian Blokland; Andrzej Czarnecki; Kirill Melnikov

2002-01-31T23:59:59.000Z

10

Hadronic contributions to the muon anomalous magnetic moment Workshop. $(g-2)_?$: Quo vadis? Workshop. Mini proceedings  

E-Print Network [OSTI]

We present the mini-proceedings of the workshops Hadronic contributions to the muon anomalous magnetic moment: strategies for improvements of the accuracy of the theoretical prediction and $(g-2)_{\\mu}$: Quo vadis?, both held in Mainz from April 1$^{\\rm rst}$ to 5$^{\\rm th}$ and from April 7$^{\\rm th}$ to 10$^{\\rm th}$, 2014, respectively.

Maurice Benayoun; Johan Bijnens; Tom Blum; Irinel Caprini; Gilberto Colangelo; Henryk Czy?; Achim Denig; Cesareo A. Dominguez; Simon Eidelman; Christian S. Fischer; Paolo Gauzzi; Yuping Guo; Andreas Hafner; Masashi Hayakawa; Gregorio Herdoiza; Martin Hoferichter; Guangshun Huang; Karl Jansen; Fred Jegerlehner; Benedikt Kloss; Bastian Kubis; Zhiqing Liu; William Marciano; Pere Masjuan; Harvey B. Meyer; Tsutomu Mibe; Andreas Nyffeler; Vladimir Pascalutsa; Vladyslav Pauk; Michael R. Pennington; Santiago Peris; Christoph F. Redmer; Pablo Sanchez-Puertas; Boris Shwartz; Evgeny Solodov; Dominik Stoeckinger; Thomas Teubner; Marc Unverzagt; Marc Vanderhaeghen; Magnus Wolke

2014-07-14T23:59:59.000Z

11

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

12

Muon Anomalous Magnetic Moment and Gauge Symmetry in the Standard Model  

E-Print Network [OSTI]

No gauge invariant regularization is available for the perturbative calculation of the standard model. One has to add finite counter terms to restore gauge symmetry for the renormalized amplitudes. The muon anomalous magnetic moment can be accurately measured but the experimental result does not entirely agree with the theoretical calculation from the standard model. This paper is to compute the contributions to the muon gyromagnetic ratio $g_{\\mu}$ due to the finite counter terms. The result obtained is found to be far from sufficient to explain the discrepancy between theory and experiment.

Tsai, Er-Cheng

2014-01-01T23:59:59.000Z

13

Muon anomalous magnetic moment in a $SU(4) \\otimes U(1)_N$ model without exotic electric charges  

E-Print Network [OSTI]

We study an electroweak gauge extension of the standard model, so called 3-4-1 model, which does not contain exotic electric charges and it is anomaly free. We discuss phenomenological constraints of the model and compute all the corrections to the muon magnetic moment. Mainly, we discuss different mass regimes and their impact on this correction, deriving for the first time direct limits on the masses of the neutral fermions and charged vector bosons. Interestingly, the model could address the reported muon anomalous magnetic moment excess, however it would demands a rather low scale of symmetry breaking, far below the current electroweak constraints on the model. Thus, if this excess is confirmed in the foreseeable future by the g-2 experiment at FERMILAB, this 3-4-1 model can be decisively ruled out since the model cannot reproduce a sizeable and positive contribution to the muon anomalous magnetic moment consistent with current electroweak limits.

Cogollo, D

2014-01-01T23:59:59.000Z

14

Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment reexamined  

Science Journals Connector (OSTI)

We discuss the hadronic light-by-light scattering contribution to the muon anomalous magnetic moment a?lbl, paying particular attention to the consistent matching between the short- and the long-distance behavior of the light-by-light scattering amplitude. We argue that short-distance QCD imposes strong constraints on this amplitude overlooked in previous analyses. We find that accounting for these constraints leads to approximately 50% increase in the central value of a?lbl, compared to commonly accepted estimates (see, e.g., [M. Davier, S. Eidelman, A. Hocker, and Z. Zhang, Eur. Phys. J. C 31, 503 (2003).]). The hadronic light-by-light scattering contribution becomes a?lbl=136(25)×10-11, thereby shifting the standard model prediction closer to the experimental value.

Kirill Melnikov and Arkady Vainshtein

2004-12-03T23:59:59.000Z

15

The Muon Anomalous Magnetic Moment in the Reduced Minimal 3-3-1 Model  

E-Print Network [OSTI]

We study the muon anomalous magnetic moment $(g-2)_{\\mu}$ in the context of the reduced minimal 3-3-1 model recently proposed in the literature. In particular, its spectrum contains a doubly charged scalar ($H^{\\pm \\pm}$) and gauge boson ($U^{\\pm \\pm}$), new singly charged vectors ($V^{\\pm}$) and a $Z^{\\prime}$ boson, each of which might give a sizeable contribution to the $(g-2)_{\\mu}$. We compute the 1-loop contributions from all these new particles to the $(g-2)_{\\mu}$. We conclude that the doubly charged vector boson provides the dominant contribution, and by comparing our results with the experimental constraints we derive an expected value for the scale of $SU(3)_L\\otimes U(1)_N$ symmetry breaking $v_{\\chi} \\sim 2$ TeV. We also note that, if the discrepancy in the anomalous moment is resolved in the future without this model then the constraints will tighten to requiring $v_\\chi > 2.7$ TeV with current precision, and will entirely rule out the model if the expected precision is achieved by the future experiment at Fermilab.

Chris Kelso; P. R. D. Pinheiro; Farinaldo S. Queiroz; William Shepherd

2013-11-30T23:59:59.000Z

16

Strange and charm quark contributions to the anomalous magnetic moment of the muon  

E-Print Network [OSTI]

We describe a new technique to determine the contribution to the anomalous magnetic moment of the muon coming from the hadronic vacuum polarization using lattice QCD. Our method reconstructs the Adler function, using Pad\\'{e} approximants, from its derivatives at $q^2=0$ obtained simply and accurately from time-moments of the vector current-current correlator at zero spatial momentum. We test the method using strange quark correlators on large-volume gluon field configurations that include the effect of up and down (at physical masses), strange and charm quarks in the sea at multiple values of the lattice spacing and multiple volumes and show that 1% accuracy is achievable. For the charm quark contributions we use our previously determined moments with up, down and strange quarks in the sea on very fine lattices. We find the (connected) contribution to the anomalous moment from the strange quark vacuum polarization to be $a_\\mu^s = 53.41(59) \\times 10^{-10}$, and from charm to be $a_\\mu^c = 14.42(39)\\times 10^{-10}$. These are in good agreement with flavour-separated results from non-lattice methods, given caveats about the comparison. The extension of our method to the light quark contribution and to that from the quark-line disconnected diagram is straightforward.

Bipasha Chakraborty; C. T. H. Davies; G. C. Donald; R. J. Dowdall; J. Koponen; G. P. Lepage; T. Teubner

2014-03-07T23:59:59.000Z

17

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

18

New Physics Contributions to the Muon Anomalous Magnetic Moment: A Numerical Code  

E-Print Network [OSTI]

We consider the contributions of individual new particles to the anomalous magnetic moment of the muon, utilizing the generic framework of simplified models. We also present analytic results for all possible one-loop contributions, allowing easy application of these results for more complete models which predict more than one particle capable of correcting the muon magnetic moment. Additionally, we provide a Mathematica code to allow the reader straightforwardly compute any 1-loop contribution. Furthermore, we derive bounds on each new particle considered, assuming either the absence of other significant contributions to $a_\\mu$ or that the anomaly has been resolved by some other mechanism. The simplified models we consider are constructed without the requirement of $SU(2)_L$ invariance, but appropriate chiral coupling choices are also considered. In summary, we found the following particles capable of explaining the current discrepancy, assuming unit couplings: $2$~TeV ($0.3$~TeV) neutral scalar with pure scalar (chiral) couplings, $4$~TeV doubly charged scalar with pure pseudoscalar coupling, $0.3-1$~TeV neutral vector boson depending on what couplings are used (vector, axial, or mixed), $0.5-1$~TeV singly-charged vector boson depending on which couplings are chosen, and $3$~TeV doubly-charged vector-coupled bosons. We also derive the following $1\\sigma$ lower bounds on new particle masses assuming unit couplings and that the experimental anomaly has been otherwise resolved: a doubly charged pseudo-scalar must be heavier than $7$~TeV, a neutral scalar than $3$~TeV, a vector-coupled new neutral boson $600$~GeV, an axial-coupled neutral boson $1.5$~TeV, a singly-charged vector-coupled $W^\\prime$ $1$~TeV, a doubly-charged vector-coupled boson $5$~TeV, scalar leptoquarks $10$~TeV, and vector leptoquarks $10$~TeV.

Farinaldo S. Queiroz; William Shepherd

2014-03-10T23:59:59.000Z

19

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

20

The strange and charm quark contributions to the anomalous magnetic moment of the muon from lattice QCD  

E-Print Network [OSTI]

We describe a new technique (published in Phys. Rev. D89 114501) to determine the contribution to the anomalous magnetic moment of the muon coming from the hadronic vacuum polarisation using lattice QCD. Our method uses Pad\\'e approximants to reconstruct the Adler function from its derivatives at $q^2=0$. These are obtained simply and accurately from time-moments of the vector current-current correlator at zero spatial momentum. We test the method using strange quark correlators calculated on MILC Collaboration's $n_f = 2+1+1$ HISQ ensembles at multiple values of the lattice spacing, multiple volumes and multiple light sea quark masses (including physical pion mass configurations). We find the (connected) contribution to the anomalous moment from the strange quark vacuum polarisation to be $a^s_\\mu=53.41(59)\\times 10^{-10}$, and the contribution from charm quarks to be $a^c_\\mu=14.42(39)\\times 10^{-10}$ - 1% accuracy is achieved for the strange quark contribution. The extension of our method to the light quar...

Koponen, Jonna; Davies, Christine T H; Donald, Gordon; Dowdall, Rachel; de Oliveira, Pedro Goncalves; Lepage, G Peter; Teubner, Thomas

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "muon anomalous magnetic" 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 strange and charm quark contributions to the anomalous magnetic moment of the muon from lattice QCD  

E-Print Network [OSTI]

We describe a new technique (published in Phys. Rev. D89 114501) to determine the contribution to the anomalous magnetic moment of the muon coming from the hadronic vacuum polarisation using lattice QCD. Our method uses Pad\\'e approximants to reconstruct the Adler function from its derivatives at $q^2=0$. These are obtained simply and accurately from time-moments of the vector current-current correlator at zero spatial momentum. We test the method using strange quark correlators calculated on MILC Collaboration's $n_f = 2+1+1$ HISQ ensembles at multiple values of the lattice spacing, multiple volumes and multiple light sea quark masses (including physical pion mass configurations). We find the (connected) contribution to the anomalous moment from the strange quark vacuum polarisation to be $a^s_\\mu=53.41(59)\\times 10^{-10}$, and the contribution from charm quarks to be $a^c_\\mu=14.42(39)\\times 10^{-10}$ - 1% accuracy is achieved for the strange quark contribution. The extension of our method to the light quark contribution and to that from the quark-line disconnected diagram is straightforward.

Jonna Koponen; Bipasha Chakraborty; Christine T. H. Davies; Gordon Donald; Rachel Dowdall; Pedro Goncalves de Oliveira; G. Peter Lepage; Thomas Teubner

2014-11-03T23:59:59.000Z

22

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

23

Leading-order hadronic contribution to the anomalous magnetic moment of the muon from N_f=2+1+1 twisted mass fermions  

SciTech Connect (OSTI)

We present results for the leading order QCD correction to the anomalous magnetic moment of the muon including the first two generations of quarks as dynamical degrees of freedom. Several light quark masses are examined in order to yield a controlled extrapolation to the physical pion mass. We analyse ensembles for three different lattice spacings and several volumes in order to investigate lattice artefacts and finite-size effects, respectively. We also provide preliminary results for this quantity for two flavours of mass-degenerate quarks at the physical value of the pion mass.

Burger, Florian [Humboldt U. Berlin; Feng, Xu [KEK; Hotzel, Grit [Humboldt U. Berlin; Jansen, Karl [DESY; Petschlies, Marcus [The Cyprus Institute; Renner, Dru B. [JLAB

2013-11-01T23:59:59.000Z

24

Leading-order hadronic contribution to the anomalous magnetic moment of the muon from N_f=2+1+1 twisted mass fermions  

E-Print Network [OSTI]

We present results for the leading order QCD correction to the anomalous magnetic moment of the muon including the first two generations of quarks as dynamical degrees of freedom. Several light quark masses are examined in order to yield a controlled extrapolation to the physical pion mass. We analyse ensembles for three different lattice spacings and several volumes in order to investigate lattice artefacts and finite-size effects, respectively. We also provide preliminary results for this quantity for two flavours of mass-degenerate quarks at the physical value of the pion mass.

Florian Burger; Xu Feng; Grit Hotzel; Karl Jansen; Marcus Petschlies; Dru B. Renner

2013-11-15T23:59:59.000Z

25

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

26

The strange and charm quark contributions to the anomalous magnetic moment (g -2) of the muon from current-current correlators  

E-Print Network [OSTI]

We describe a new technique (presented in arXiv:1403.1778) to determine the contribution to the anomalous magnetic moment (g-2) of the muon coming from the hadronic vacuum polarisation using lattice QCD. Our method uses Pad\\'{e} approximants to reconstruct the Adler function from its derivatives at $q^2=0$. These are obtained simply and accurately from time-moments of the vector current-current correlator at zero spatial momentum. We test the method using strange quark correlators calculated on MILC Collaboration's $n_f$ = 2+1+1 HISQ ensembles at multiple values of the lattice spacing, multiple volumes and multiple light sea quark masses (including physical pion mass configurations).

Chakraborty, Bipasha; Donald, Gordon; Dowdall, Rachel; de Oliveira, Pedro Gonçalves; Koponen, Jonna; Lepage, G Peter; Teubner, T

2014-01-01T23:59:59.000Z

27

The strange and charm quark contributions to the anomalous magnetic moment (g -2) of the muon from current-current correlators  

E-Print Network [OSTI]

We describe a new technique (presented in arXiv:1403.1778) to determine the contribution to the anomalous magnetic moment (g-2) of the muon coming from the hadronic vacuum polarisation using lattice QCD. Our method uses Pad\\'{e} approximants to reconstruct the Adler function from its derivatives at $q^2=0$. These are obtained simply and accurately from time-moments of the vector current-current correlator at zero spatial momentum. We test the method using strange quark correlators calculated on MILC Collaboration's $n_f$ = 2+1+1 HISQ ensembles at multiple values of the lattice spacing, multiple volumes and multiple light sea quark masses (including physical pion mass configurations).

Bipasha Chakraborty; Christine Davies; Gordon Donald; Rachel Dowdall; Pedro Gonçalves de Oliveira; Jonna Koponen; G. Peter Lepage; T. Teubner

2014-10-30T23:59:59.000Z

28

Magnets for Muon 6D Cooling Channels  

SciTech Connect (OSTI)

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

29

Anomalous Lagrangians and the radiative muon capture in hydrogen  

E-Print Network [OSTI]

The structure of an anomalous Lagrangian of the pi-rho-omega-a_1 system is investigated within the hidden local SU(2)_R x SU(2)_L symmetry approach. The interaction of the external electromagnetic and weak vector and axial-vector fields with the above hadron system is included. The Lagrangian of interest contains the anomalous Wess-Zumino term following from the well known Wess-Zumino-Witten action and six independent homogenous terms. It is characterized by four constants that are to be determined from a fit to the data on various elementary reactions. Present data allows one to extract the constants with a good accuracy. The homogenous part of the Lagrangian has been applied in the study of anomalous processes that could enhance the high energy tail of the spectrum of photons, produced in the radiative muon capture in hydrogen. It should be noted that recently, an intensive search for such enhancement processes has been carried in the literature, in an attempt to resolve the so called "g_P puzzle": an about 50 % difference between the theoretical prediction of the value of the induced pseudoscalar constant g_P and its value extracted from the high energy tail of the photon spectrum, measured in the precision TRIUMF experiment. Here, more details on the studied material are presented and new results, obtained by using the Wess-Zumino term, are provided.

J. Smejkal; E. Truhlik; F. C. Khanna

2005-04-29T23:59:59.000Z

30

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

31

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

32

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

33

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

34

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

35

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

36

The investigation of anomalous magnetization in the Raft River valley,  

Open Energy Info (EERE)

investigation of anomalous magnetization in the Raft River valley, investigation of anomalous magnetization in the Raft River valley, Idaho Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: The investigation of anomalous magnetization in the Raft River valley, Idaho Details Activities (1) Areas (1) Regions (0) Abstract: Cassia County Idaho; clastic sediments; economic geology; exploration; geophysical methods; geophysical surveys; geothermal energy; gravel; ground methods; Idaho; isothermal remanent magnetization; magnetic anomalies; magnetic methods; magnetic properties; magnetic susceptibility; magnetization; paleomagnetism; Raft River basin; remanent magnetization; sediments; surveys; United States Author(s): Anderson, L.A.; Mabey, D.R. Published: Abstracts - Society of Exploration Geophysicists International

37

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

38

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

39

Correcting Aberrations in Complex Magnet Systems for Muon Cooling Channels  

SciTech Connect (OSTI)

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

40

Analytical eighth-order light-by-light QED contributions from leptons with heavier masses to the anomalous magnetic moment of electron  

Science Journals Connector (OSTI)

The important consequences of the recent results of the numerical evaluations of eighth- and tenth-order QED contributions to the anomalous magnetic moment of electrons are commented upon on this paper. The correctness of the results of the numerical evaluation of the new eighth-order QED corrections to the electron anomaly are supported by the demonstration of their consistency with the presented in this work analytical expressions QED contributions to ae from the diagrams with fourth-order light-by-light scattering muon and tau-lepton loops. The consistency of similar analytical and numerical results is demonstrated in the case of eighth-order mass-dependent contributions to the muon’s anomalous magnetic moment.

A. L. Kataev

2012-07-16T23:59:59.000Z

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

E-Print Network 3.0 - anomalous magnetic ordering Sample Search...  

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

on phenomenological modeling of magnetic reconnection based on anomalous... of magnetic field lines for (a) uniform resistivity model (j ... Source: Yokoyama Takaaki - Department...

42

Anomalous skin effects in a weakly magnetized degenerate electron plasma  

SciTech Connect (OSTI)

Fully relativistic analysis of anomalous skin effects for parallel propagating waves in a weakly magnetized degenerate electron plasma is presented and a graphical comparison is made with the results obtained using relativistic Maxwellian distribution function [G. Abbas, M. F. Bashir, and G. Murtaza, Phys. Plasmas 18, 102115 (2011)]. It is found that the penetration depth for R- and L-waves for degenerate case is qualitatively small in comparison with the Maxwellian plasma case. The quantitative reduction due to weak magnetic field in the skin depth in R-wave for degenerate plasma is large as compared to the non-degenerate one. By ignoring the ambient magnetic field, previous results for degenerate field free case are salvaged [A. F. Alexandrov, A. S. Bogdankevich, and A. A. Rukhadze, Principles of Plasma Electrodynamics (Springer-Verlag, Berlin/Heidelberg, 1984), p. 90].

Abbas, G., E-mail: gohar.abbas@gcu.edu.pk; Sarfraz, M. [Department of Physics, GC University Lahore, Katchery Road, Lahore 54000 (Pakistan); Shah, H. A. [Forman Christian College University, Farozpur Road, Lahore 54600 (Pakistan)

2014-09-15T23:59:59.000Z

43

Search for anomalous production of prompt like-sign muon pairs and constraints on physics beyond the Standard Model with the ATLAS detector  

E-Print Network [OSTI]

An inclusive search for anomalous production of two prompt, isolated muons with the same electric charge is presented. The search is performed in a data sample corresponding to 1.6 fb^-1 of integrated luminosity collected in 2011 at sqrt(s) = 7 TeV with the ATLAS detector at the LHC. Muon pairs are selected by requiring two isolated muons of the same electric charge with pT > 20 GeV and abs(eta) < 2.5. Minimal requirements are placed on the rest of the event activity. The distribution of the invariant mass of the muon pair m(mumu) is found to agree well with the background expectation. Upper limits on the cross section for anomalous production of two muons with the same electric charge are placed as a function of m(mumu) within a fiducial region defined by the event selection. The fiducial cross- section limit constrains the like-sign top-quark pair-production cross section to be below 3.7 pb at 95% confidence level. The data are also analyzed to search for a narrow like-sign dimuon resonance as predicted ...

Aad, Georges; Abdallah, Jalal; Abdelalim, Ahmed Ali; Abdesselam, Abdelouahab; Abdinov, Ovsat; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Acerbi, Emilio; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Addy, Tetteh; Adelman, Jahred; Aderholz, Michael; Adomeit, Stefanie; Adragna, Paolo; Adye, Tim; Aefsky, Scott; Aguilar-Saavedra, Juan Antonio; Aharrouche, Mohamed; Ahlen, Steven; Ahles, Florian; Ahmad, Ashfaq; Ahsan, Mahsana; Aielli, Giulio; Akdogan, Taylan; ?kesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Akiyama, Kunihiro; Alam, Mohammad; Alam, Muhammad Aftab; Albert, Justin; Albrand, Solveig; Aleksa, Martin; Aleksandrov, Igor; Alessandria, Franco; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Aliev, Malik; Alimonti, Gianluca; Alison, John; Aliyev, Magsud; Allport, Phillip; Allwood-Spiers, Sarah; Almond, John; Aloisio, Alberto; Alon, Raz; Alonso, Alejandro; Alvarez Gonzalez, Barbara; Alviggi, Mariagrazia; Amako, Katsuya; Amaral, Pedro; Amelung, Christoph; Ammosov, Vladimir; Amorim, Antonio; Amorós, Gabriel; Amram, Nir; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Andrieux, Marie-Laure; Anduaga, Xabier; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonaki, Ariadni; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoun, Sahar; Aperio Bella, Ludovica; Apolle, Rudi; Arabidze, Giorgi; Aracena, Ignacio; Arai, Yasuo; Arce, Ayana; Archambault, John-Paul; Arfaoui, Samir; Arguin, Jean-Francois; Arik, Engin; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnault, Christian; Artamonov, Andrei; Artoni, Giacomo; Arutinov, David; Asai, Shoji; Asfandiyarov, Ruslan; Ask, Stefan; ?sman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astbury, Alan; Astvatsatourov, Anatoli; Aubert, Bernard; Auge, Etienne; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Avramidou, Rachel Maria; Axen, David; Ay, Cano; Azuelos, Georges; Azuma, Yuya; Baak, Max; Baccaglioni, Giuseppe; Bacci, Cesare; Bach, Andre; Bachacou, Henri; Bachas, Konstantinos; Bachy, Gerard; Backes, Moritz; Backhaus, Malte; Badescu, Elisabeta; Bagnaia, Paolo; Bahinipati, Seema; Bai, Yu; Bailey, David; Bain, Travis; Baines, John; Baker, Oliver Keith; Baker, Mark; Baker, Sarah; Banas, Elzbieta; Banerjee, Piyali; Banerjee, Swagato; Banfi, Danilo; Bangert, Andrea Michelle; Bansal, Vikas; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barashkou, Andrei; Barbaro Galtieri, Angela; Barber, Tom; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Bardin, Dmitri; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnett, Bruce; Barnett, Michael; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Barrillon, Pierre; Bartoldus, Rainer; Barton, Adam Edward; Bartsch, Valeria; Bates, Richard; Batkova, Lucia; Batley, Richard; Battaglia, Andreas; Battistin, Michele; Bauer, Florian; Bawa, Harinder Singh; Beale, Steven; Beare, Brian; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Sebastian; Beckingham, Matthew; Becks, Karl-Heinz; Beddall, Andrew; Beddall, Ayda; Bedikian, Sourpouhi; Bednyakov, Vadim; Bee, Christopher; Begel, Michael; Behar Harpaz, Silvia; Behera, Prafulla; Beimforde, Michael; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellina, Francesco; Bellomo, Massimiliano; Belloni, Alberto; Beloborodova, Olga; Belotskiy, Konstantin; Beltramello, Olga; Ben Ami, Sagi; Benary, Odette; Benchekroun, Driss; Benchouk, Chafik; Bendel, Markus; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Benoit, Mathieu; Bensinger, James; Benslama, Kamal; Bentvelsen, Stan; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Berglund, Elina; Beringer, Jürg; Bernat, Pauline; Bernhard, Ralf; Bernius, Catrin; Berry, Tracey; Bertella, Claudia; Bertin, Antonio; Bertinelli, Francesco; Bertolucci, Federico; Besana, Maria Ilaria; Besson, Nathalie; Bethke, Siegfried; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Bierwagen, Katharina; Biesiada, Jed; Biglietti, Michela; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien; Bingul, Ahmet; Bini, Cesare; Biscarat, Catherine; Bitenc, Urban; Black, Kevin

2012-01-01T23:59:59.000Z

44

Limit on the Muon Neutrino Magnetic Moment And A Measurement of the CCPIP to CCQE Cross Section Ratio.  

E-Print Network [OSTI]

??A search for the muon neutrino magnetic moment was conducted using the Mini- BooNE low energy neutrino data. The analysis was performed by analyzing the… (more)

Ouedraogo, Serge Arisitde

2008-01-01T23:59:59.000Z

45

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

46

A Novel Method for Transport and Cooling of a Muon Beam Based on Magnetic Insulation  

SciTech Connect (OSTI)

Unwanted field emission is a well known problem for high-gradient accelerating structures as it can cause damage and initiate breakdown. Recent experiments indicated that the deleterious effects of field-emission are greatly enhanced in the presence of external magnetic fields. In the context of designing a muon accelerator this imposes numerous constraints since rf cavities need to operate within strong magnetic fields in order to successfully transport the beam. Here, a novel design of a magnetically insulated cavity in which the walls are parallel to the magnetic field lines is presented. We show that with magnetic insulation, damage from field emission can be significantly suppressed. Effects of coil positioning errors on the cavity performance are discussed and the required magnetic field strength to achieve insulation is estimated. We present a conceptual design of a muon collider cooling lattice with magnetic insulated cavities and cross-check its performance to the one with pillbox cavities. Finally an experiment to test magnetic insulation is described.

Stratakis, Diktys; Gallardo, Juan C.; Palmer, Robert B. [Department of Physics, Brookhaven National Laboratory, Upton, NY 11973 (United States)

2010-11-04T23:59:59.000Z

47

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

48

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

49

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

50

Leading-order hadronic contributions to the electron and tau anomalous magnetic moments  

E-Print Network [OSTI]

The leading hadronic contributions to the anomalous magnetic moments of the electron and the $\\tau$-lepton are determined by a four-flavour lattice QCD computation with twisted mass fermions. The continuum limit is taken and systematic uncertainties are quantified. Full agreement with results obtained by phenomenological analyses is found.

Burger, Florian; Jansen, Karl; Petschlies, Marcus

2015-01-01T23:59:59.000Z

51

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

52

A novel precision measurement of muon g - 2 and EDM at J-PARC  

SciTech Connect (OSTI)

We propose a new experiment to measure the muon anomalous magnetic moment g - 2 and electric dipole moment with a novel technique called ultra-slow muon beam at J-PARC. Precision measurement of these dipole moments plays an important role in fundamental physics to search for a new physics beynd standard model. The concept of the experiment and its current status is described.

Saito, Naohito [1-1 Oho, Tsukuba, Ibaraki, 305-0801 (Japan); Collaboration: J-PARC g-2 /EDM Collaboration

2012-07-27T23:59:59.000Z

53

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

54

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

55

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

56

Anomalous behaviour of magnetic coercivity in graphene oxide and reduced graphene oxide  

SciTech Connect (OSTI)

In this report, we present the temperature dependence of the magnetic coercivity of graphene oxide (GO) and reduced graphene oxide (RGO). We observe an anomalous decrease in coercivity of GO and RGO with decreasing temperature. The observation could be understood by invoking the inherent presence of wrinkles on graphene oxide due to presence of oxygen containing groups. Scanning electron microscopic image reveals high wrinkles in GO than RGO. We observe higher coercivity in RGO than in GO. At room temperature, we observe antiferromagnetic and ferromagnetic behaviours in GO and RGO, respectively. Whereas, at low temperatures (below T?=?60–70?K), both materials show paramagnetic behaviour.

Bagani, K.; Bhattacharya, A.; Kaur, J.; Rai Chowdhury, A.; Ghosh, B.; Banerjee, S., E-mail: sangam.banerjee@saha.ac.in [Saha Institute of Nuclear Physics, Surface Physics Division, 1/AF Bidhannagar, Kolkata 700064 (India); Sardar, M. [Material Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)

2014-01-14T23:59:59.000Z

57

Magnetic excitations and anomalous spin-wave broadening in multiferroic FeV2O4  

SciTech Connect (OSTI)

We report on the different roles of two orbital-active Fe2+ at the A site and V3+ at the B site in the magnetic excitations and on the anomalous spin-wave broadening in FeV2O4. FeV2O4 exhibits three structural transitions and successive paramagnetic (PM)–collinear ferrimagnetic (CFI)–noncollinear ferrimagnetic (NCFI)/ferroelectric transitions. The high-temperature tetragonal/PM–orthorhombic/CFI transition is accompanied by the appearance of a large energy gap in the magnetic excitations due to strong spin-orbit-coupling-induced anisotropy at the Fe2+ site. While there is no measurable increase in the energy gap from the orbital ordering of V3+ at the orthorhombic/CFI–tetragonal/NCFI transition, anomalous spin-wave broadening is observed in the orthorhombic/CFI state due to V3+ spin fluctuations at the B site. The spin-wave broadening is also observed at the zone boundary without softening in the NCFI/ferroelectric phase, which is discussed in terms of magnon-phonon coupling. Our study also indicates that the Fe2+ spins without the frustration at the A site may not play an important role in inducing ferroelectricity in the tetragonal/NCFI phase of FeV2O4.

Zhang, Qiang [Ames Laboratory; Ramazanoglu, Mehmet [Ames Laboratory; Chi, Songxue [Oak Ridge National Laboratory; Liu, Yong [Ames Laboratory; Lograsso, Thomas A. [Ames Laboratory; Vaknin, David [Ames Laboratory

2014-06-01T23:59:59.000Z

58

Muon spin relaxation studies of incommensurate magnetism and superconductivity in stage-4 La2CuO4.11 and La1.88Sr0.12CuO4  

E-Print Network [OSTI]

Muon spin relaxation studies of incommensurate magnetism and superconductivity in stage-4 La2CuO4-0011, Japan Received 1 February 2002; published 16 July 2002 We report muon spin relaxation ( SR) measurements, zero-field SR measurements show muon spin precession below the Ne´el temperature TN with frequency 3

59

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

60

Synthesis and anomalous magnetic properties of hexagonal CoO nanoparticles  

SciTech Connect (OSTI)

Highlights: {yields} The as-synthesized CoO nanoparticles are of pyramid configuration with hcp structure. {yields} The hexagonal CoO particles do not exhibit antiferromagnetic transition around 300 K. {yields} The CoO particles have relative large saturation magnetization and coercivity at 5 K. {yields} The shift of hysteresis loops is consistent with the result of multisublattice model. {yields} The particles contain intrinsic antiferromagnetic structure and uncompensated spins. -- Abstract: CoO nanoparticles in the 38-93 nm range have been prepared by thermal decomposition. The particles were characterized to be pyramid shape with a hexagonal close-packed structure. Their anomalous magnetic behavior includes: (i) vanishing of antiferromagnetic transition around 300 K; (ii) creation of hysteresis below a blocking temperature of 6-11 K; (iii) presence of relatively large moments and coercivities accompany with specific loop shifts at 5 K; and (iv) appearance of an additional small peak located in low field in the electron spin resonance spectrum. Further, the present results provide evidence for the existence of uncompensated surface spins. The coercivity and exchange bias decrease with increasing particle size, indicating a distinct size effect. These observations can be explained by the multisublattice model, in which the reduced coordination of surface spins causes a fundamental change in the magnetic order throughout the total CoO particle.

He, Xuemin [Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 (China)] [Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 (China); Shi, Huigang, E-mail: shihuig@lzu.edu.cn [Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 (China)] [Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 (China)

2011-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

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

62

Muon Muon Collider: Feasibility Study  

SciTech Connect (OSTI)

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

63

Metal-insulator transition in Si:X (X=P,B): Anomalous response to a magnetic field  

Science Journals Connector (OSTI)

The zero-temperature magnetoconductivity of just-metallic Si:P scales with magnetic field H and dopant concentration n lying on a single universal curve: ?(n,H)/?(n,0)=G[H-??n] with a magnetic-field crossover exponent ??2. We note that Si:P, Si:B, and Si:As all have unusually large crossover exponents near 2, and suggest that this anomalously weak response to a magnetic field, ?nc?H?, is a common feature of uncompensated doped semiconductors.

M. P. Sarachik; D. Simonian; S. V. Kravchenko; S. Bogdanovich; V. Dobrosavljevic; G. Kotliar

1998-09-15T23:59:59.000Z

64

Anomalous peak at low fields in the magnetization versus temperature curve in bulk ceramic high-temperature superconductors  

Science Journals Connector (OSTI)

When a bulk ceramic high-temperature superconductor is cooled in a small field and the magnetic moment of the sample is measured as the sample is warmed, an anomalous peak in the magnetic moment is observed. This peak can be as high as 50% of the low-temperature moment for fields less than 1 Oe, but it rapidly decreases as the magnetic field increases. We show that this anomaly is due to the interrelationship between flux trapping by intergranular weak links and the irreversible flux trapping properties of the superconducting grains as recently described by Hao and Clem.

J. P. Wang and W. C. H. Joiner

1994-07-01T23:59:59.000Z

65

Papers on Muon Colliders  

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

66

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

67

A magnetic spectrometer measurement of the charge ratio of energetic cosmic ray muons  

E-Print Network [OSTI]

" of 35 Bev. Th, . " periment has been carried out with a magnetic momentum spectrometer-telescope consisting of two separate solid- izon magnets in conjun tinn iwith detectors of penetrating ionizing particles. The incident particles recorded were... directions of the particles as they entered the top magnet and the exit directions from the lower magnet. The magnitudes and directions of the deflections in the known magnetic field have then been used to determine the moments and charges...

Bateman, Benjamin Jefferson

2012-06-07T23:59:59.000Z

68

Science is measurement: muons, money and the Nobel Prize  

Science Journals Connector (OSTI)

This article investigates the difference in measurement methods between contemporary particle physics and economics. The book Measurement in Economics: A Handbook, (Boumans, 2007), is used to present the current state of measurement technique in economics. These views are compared with the measurement of the anomalous magnetic moment of the muon. Particle physics is realist in measurement while economics is not. The reality check on theory that measurement provides in particle physics is conspicuously absent in economics. However, the nature of the social world precludes the use of the same measurement approach.

Jeffrey David Turk

2011-01-01T23:59:59.000Z

69

Holographic calculation of hadronic contributions to muon g-2  

E-Print Network [OSTI]

Using the gauge/gravity duality, we compute the leading order hadronic (HLO) contribution to the anomalous magnetic moment of muon, amu(HLO). Holographic renormalization is used to obtain a finite vacuum polarization. We find amu(HLO) =470.5 x 10^{-10} in AdS/QCD with two light flavors, which is compared with the currently revised BABAR data estimated from e^+ e^- -> pi^+ pi^- events, amu(HLO)[pipi]=(514.1 +- 3.8) x 10^{-10}.

Deog Ki Hong; Doyoun Kim; Shinya Matsuzaki

2009-11-03T23:59:59.000Z

70

The Neutrino Factory and Muon Collider Collaboration MERIT 15-T Pulsed Solenoid Magnet  

E-Print Network [OSTI]

insulation. · Ice buildup on magnet connections. · Liquefaction of oxygen. · LN2 filling and draining. Kirk T

McDonald, Kirk

71

Strongly anomalous diffusion in sheared magnetic configurations E. Vanden Eijnden and R. Balescu  

E-Print Network [OSTI]

. In the latter case, the magnetic field is completely stochastic and a single magnetic line fills a three The statistical behavior of magnetic lines in a sheared magnetic configuration with reference surface x 0 of motion of the stochastic magnetic lines. After averaging over an ensemble of realizations, it yields

Van Den Eijnden, Eric

72

E-Print Network 3.0 - anomalous magnetic behavior Sample Search...  

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

of Physics, University of Maryland at College Park Collection: Engineering ; Materials Science 3 Probing the magnetic microstructure of an amorphous GdFe system with magnetic...

73

Effect of Field Errors in Muon Collider IR Magnets on Beam Dynamics  

SciTech Connect (OSTI)

In order to achieve peak luminosity of a Muon Collider (MC) in the 10{sup 35} cm{sup -2}s{sup -1} range very small values of beta-function at the interaction point (IP) are necessary ({beta}* {le} 1 cm) while the distance from IP to the first quadrupole can not be made shorter than {approx}6 m as dictated by the necessity of detector protection from backgrounds. In the result the beta-function at the final focus quadrupoles can reach 100 km making beam dynamics very sensitive to all kind of errors. In the present report we consider the effects on momentum acceptance and dynamic aperture of multipole field errors in the body of IR dipoles as well as of fringe-fields in both dipoles and quadrupoles in the ase of 1.5 TeV (c.o.m.) MC. Analysis shows these effects to be strong but correctable with dedicated multipole correctors.

Alexahin, Y.; Gianfelice-Wendt, E.; Kapin, V.V.; /Fermilab

2012-05-01T23:59:59.000Z

74

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

75

Muon systems  

SciTech Connect (OSTI)

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

76

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

77

Anomalous thickness-dependent strain states and strain-tunable magnetization in Zn-doped ferrite epitaxial films  

SciTech Connect (OSTI)

A series of Zn{sub x}Fe{sub 3?x}O{sub 4} (ZFO, x?=?0.4) thin films were epitaxially deposited on single-crystal (001)-SrTiO{sub 3} (STO) substrates by radio frequency magnetron sputtering. The anomalous thickness-dependent strain states of ZFO films were found, i.e., a tensile in-plane strain exists in the thinner ZFO film and which monotonously turns into compressive in the thicker films. Considering the lattice constant of bulk ZFO is bigger than that of STO, this strain state cannot be explained in the conventional framework of lattice-mismatch-induced strain in the hetero-epitaxial system. This unusual phenomenon is proposed to be closely related to the Volmer-Weber film growth mode in the thinner films and incorporation of the interstitial atoms into the island's boundaries during subsequent epitaxial growth of the thicker films. The ZFO/STO epitaxial film is found in the nature of magnetic semiconductor by transport measurements. The in-plane magnetization of the ZFO/STO films is found to increase as the in-plane compressive strain develops, which is further proved in the (001)-ZFO/PMN-PT film where the film strain state can be in situ controlled with applied electric field. This compressive-strain-enhanced magnetization can be attributed to the strain-mediated electric-field-induced in-plane magnetic anisotropy field enhancement. The above results indicate that strain engineering on magnetic oxide semiconductor ZFO films is promising for novel oxide-electronic devices.

Yang, Y. J.; Bao, J.; Gao, C., E-mail: zlluo@ustc.edu.cn, E-mail: cgao@ustc.edu.cn [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026 (China); CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); Yang, M. M.; Luo, Z. L., E-mail: zlluo@ustc.edu.cn, E-mail: cgao@ustc.edu.cn; Hu, C. S.; Chen, X. C.; Pan, G. Q. [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026 (China); Huang, H. L. [CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); Zhang, S.; Wang, J. W.; Li, P. S.; Liu, Y.; Zhao, Y. G. [Department of Physics and State Key Laboratory of New Ceramics, Fine Processing, Tsinghua University, Beijing 100084 (China); Jiang, T.; Liu, Y. K.; Li, X. G. [Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science, Technology of China, Hefei, Anhui 230026 (China)

2014-05-07T23:59:59.000Z

78

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

79

An ultra-precise storage ring for the muon g -- 2 measurement  

SciTech Connect (OSTI)

An ultra precise 3 GeV/c storage ring with a 14.5 kG super-ferric magnet is under construction at the Brookhaven AGS for the measurement of the muon anomalous magnetic moment to 0.35 ppM accuracy. This requires a magnetic field with is constant to {approx} 1 ppM and is known sufficiently well that the magnetic field integral averaged over the muon orbits can be calculated to 0.1 ppM. First the magnetic field will be statically shimmed by various techniques. Pole face winding will be used for final small static and dynamic corrections. Very elaborate NMR field monitoring techniques are required. A movable trolley'' located inside the vacuum chamber and the electrostatic focusing quadrupoles will measure the field throughout the muon storage volume. The trolley siding'' is 180{degree} from the injection point where no electric quadrupoles are located. Injection can be interrupted so the trolley can circle the ring. Also {approx}200 NMR probes located outside the vacuum chamber monitor the field during physics running and control the pole face windings. The very large ({approx}15 m diameter) superconducting coils (SC) are designed. Test winding will soon commence. Orders for the magnet steel can now be placed. R and D on various pulsed and SC dc injection methods is ongoing. 4 refs., 4 figs., 4 tabs.

Brown, D.; DeWinter, T.; Hazen, E.; Heisey, C.; Kerosky, B.; Krienen, F.; Loomba, D.; McIntyre, E.; Magaud, D.; Meng, W.; Miller, J.; Posnick, L.; Roberts, B.; Stassinopoulos, D.; Sulak, L.; Worstell, W.; Bunce, G.; Brown, H.; Chertok, B.; Cottingham, G.; Cullen, J.; Danby, G.; Jackson, J.; May, M.; Mills, J.; Pai, C.; Pendzick, A.; Polk, I.; Prodell, A.; Snydstrup, L.; Shutt, R.; Woodle, K.; Becker, K.; Lubell, M.; Kinoshita, T.

1989-01-01T23:59:59.000Z

80

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

Efficiency enhancement of anomalous-Doppler electron cyclotron masers with tapered magnetic field  

SciTech Connect (OSTI)

The efficiency of slow-wave electron cyclotron masers (ECM) is usually low, thus limiting the practical applications. Here, a method of tapered magnetic field is introduced for the efficiency enhancement of the slow-wave ECM. The numerical calculations show that the tapered magnetic-field method can enhance the efficiency of slow-wave ECM significantly. The effect of beam electron velocity spread on the efficiency has also been studied. Although the velocity spread reduces the efficiency, a great enhancement of efficiency can still be obtained by the tapered magnetic field method.

Xie, Chao-Ran; Hou, Zhi-Ling [Beijing Key Laboratory of Harmful Chemicals Analysis and School of Science, Beijing University of Chemical Technology, Beijing 100029 (China)] [Beijing Key Laboratory of Harmful Chemicals Analysis and School of Science, Beijing University of Chemical Technology, Beijing 100029 (China); Kong, Ling-Bao, E-mail: konglingbao@gmail.com, E-mail: pkliu@pku.edu.cn [School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China) [School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China); Beijing Key Laboratory of Harmful Chemicals Analysis and School of Science, Beijing University of Chemical Technology, Beijing 100029 (China); Liu, Pu-Kun, E-mail: konglingbao@gmail.com, E-mail: pkliu@pku.edu.cn; Du, Chao-Hai [School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China)] [School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China); Jin, Hai-Bo [School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China)] [School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China)

2014-02-15T23:59:59.000Z

82

Anomalous diffusion of field lines and charged particles in Arnold-Beltrami-Childress force-free magnetic fields  

SciTech Connect (OSTI)

The cosmic magnetic fields in regions of low plasma pressure and large currents, such as in interstellar space and gaseous nebulae, are force-free in the sense that the Lorentz force vanishes. The three-dimensional Arnold-Beltrami-Childress (ABC) field is an example of a force-free, helical magnetic field. In fluid dynamics, ABC flows are steady state solutions of the Euler equation. The ABC magnetic field lines exhibit a complex and varied structure that is a mix of regular and chaotic trajectories in phase space. The characteristic features of field line trajectories are illustrated through the phase space distribution of finite-distance and asymptotic-distance Lyapunov exponents. In regions of chaotic trajectories, an ensemble-averaged variance of the distance between field lines reveals anomalous diffusion—in fact, superdiffusion—of the field lines. The motion of charged particles in the force-free ABC magnetic fields is different from the flow of passive scalars in ABC flows. The particles do not necessarily follow the field lines and display a variety of dynamical behavior depending on their energy, and their initial pitch-angle. There is an overlap, in space, of the regions in which the field lines and the particle orbits are chaotic. The time evolution of an ensemble of particles, in such regions, can be divided into three categories. For short times, the motion of the particles is essentially ballistic; the ensemble-averaged, mean square displacement is approximately proportional to t{sup 2}, where t is the time of evolution. The intermediate time region is defined by a decay of the velocity autocorrelation function—this being a measure of the time after which the collective dynamics is independent of the initial conditions. For longer times, the particles undergo superdiffusion—the mean square displacement is proportional to t{sup ?}, where ??>?1, and is weakly dependent on the energy of the particles. These super-diffusive characteristics, both of magnetic field lines and of particles moving in these fields, strongly suggest that theories of transport in three-dimensional chaotic magnetic fields need a shift from the usual paradigm of quasilinear diffusion.

Ram, Abhay K. [Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Dasgupta, Brahmananda [Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, Alabama 35805 (United States); Krishnamurthy, V. [Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, Virginia 22030 (United States); Mitra, Dhrubaditya [Nordita, KTH Royal Institute of Technology and Stockholm University, 10691 Stockholm (Sweden)

2014-07-15T23:59:59.000Z

83

Magnetic Field Line Transport in Anisotropic Magnetic Turbulence: Anomalous, Quasilinear, and Percolative Regimes Versus the Kubo Number  

Science Journals Connector (OSTI)

The transport of plasma and of energetic particles because of magnetic turbulence is relevant to many space plasmas, ranging from the planetary magnetospheres to the solar corona and to the heliosphere. Variou...

Gaetano Zimbardo; Pierluigi Veltri; Pierre Pommois

84

Muon Collider  

SciTech Connect (OSTI)

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

85

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

86

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

87

Long-wavelength anomalous diffusion mode in the two-dimensional XY dipole magnet  

E-Print Network [OSTI]

omega similar to k(y)(Delta y) and i omega similar to k(x)(Delta x), where Delta(y)=47/27 and Delta(x)=47/36. The low-frequency response to the external magnetic field is found....

Abanov, Artem; Kashuba, A.; Pokrovsky, Valery L.

1997-01-01T23:59:59.000Z

88

Muon (g-2) from the bulk neutrino field in a warped extra dimensional model  

E-Print Network [OSTI]

In the Randall-Sundrum model, a bulk neutrino field in the 5-dimensional space-time can give rise to tiny Dirac masses to neutrinos. In such a scenario, we have computed the contribution of the bulk neutrino field to the anomalous magnetic moment $(g-2)_\\mu$ of muon. We have computed this contribution in the 't Hooft-Feynman gauge and have found that the contribution has the right sign to fit the current discrepancy between the experiment and the standard model value of $(g-2)_\\mu$. We have also studied possible constraints on the model parameters by including contributions to $(g-2)_\\mu$ from other sources such as bulk gravitons.

R. S. Hundi; Sourov Roy; Soumitra SenGupta

2012-06-22T23:59:59.000Z

89

Magnetic excitations and anomalous spin wave broadening in multiferroic FeV2O4  

SciTech Connect (OSTI)

FeV2O4 is found to show three structural transitions and successive paramagnetic(PM)- collinear ferrimagnetic(CFI)-nocollinear ferrimagnetic(NCFI) magnetic transitions. The tetragonal- orthorhombic structural transition associated with PM-CFI transition is accompanied by the ap- pearance of an energy gap with a high magnitude in the magnetic excitation spectrum, which is a consequence of the strong spin-orbital coupling induced anisotropy at Fe2+ A site. The comparison of Fe spin waves at CFI and noncollinear ferrimagnetic/ferroelectric phases shows no signicant spin frustration of Fe2+ spins at A site, suggesting A-site Fe2+ spins may not play a main role in the appearance of the ferroelectricity. Spin wave damping shows a rapid increase when NCFI transforms to CFI phase, indicating a possible V3+ spin uctuations at B site prior to their true canting in the NCFI phase. The spin wave broadening is also observed at the zone boundary without the spin wave softening, which is discussed in terms of the eect of magnon-phonon coupling. Understanding the

Zhang, Qiang [Ames Laboratory and Iowa State University; Ramazanoglu, Mehmet [Ames Laboratory; Chi, Songxue [ORNL; Liu, Yong [Ames Laboratory; Lograsso, Thomas [Ames Laboratory; Vaknin, David [Ames Laboratory

2014-01-01T23:59:59.000Z

90

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

91

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

92

LINACS FOR FUTURE MUON FACILITIES  

SciTech Connect (OSTI)

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

93

Anomalous-viscosity current drive  

DOE Patents [OSTI]

The present invention relates to a method and apparatus for maintaining a steady-state current for magnetically confining the plasma in a toroidal magnetic confinement device using anomalous viscosity current drive. A second aspect of this invention relates to an apparatus and method for the start-up of a magnetically confined toroidal plasma.

Stix, T.H.; Ono, M.

1986-04-25T23:59:59.000Z

94

First Observation of Accelerator Muon Antineutrinos in MINOS  

SciTech Connect (OSTI)

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

95

Superconductivity and fluctuating magnetism in quasi-two-dimensional {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br probed with implanted muons.  

SciTech Connect (OSTI)

A muon-spin relaxation ({mu}{sup +}SR) investigation is presented for the molecular superconductor {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br. Evidence is found for low-temperature phase separation throughout the bulk of the material, with only a fraction of the sample showing a superconducting signal, even for slow cooling. Rapid cooling reduces the superconducting fraction still further. For the superconducting phase, the in-plane penetration depth is measured to be {lambda}{parallel} = 0.47(1) {micro}m, and evidence is seen for a vortex decoupling transition in applied fields above 40 mT. The magnetic fluctuations in the normal state produce a precipitous drop in relaxation rate above 100 K, and we discuss the possible causes for the unusual relaxation that we observe for T > T{sub c}.

Lancaster, T.; Blundel, S. J.; Pratt, F. L.; Schlueter, J. A.; Materials Science Division; Rutherford Appleton Lab.; Oxford Univ.

2011-01-19T23:59:59.000Z

96

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

97

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

98

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

99

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

100

The leading hadronic contribution to (g-2) of the muon: The chiral behavior using the mixed representation method  

E-Print Network [OSTI]

We extend our analysis of the leading hadronic contribution to the anomalous magnetic moment of the muon using the mixed representation method to study its chiral behavior. We present results derived from local-conserved two-point lattice vector correlation functions, computed on a subset of light two-flavor ensembles made available to us through the CLS effort with pion masses as low as 190 MeV. The data is analyzed also using the more standard four-momentum method. Both methods are systematically compared as the calculations approach the physical point.

Francis, Anthony; Herdoiza, Gregorio; Horch, Hanno; Jaeger, Benjamin; Meyer, Harvey B; Wittig, Hartmut

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

The leading hadronic contribution to (g-2) of the muon: The chiral behavior using the mixed representation method  

E-Print Network [OSTI]

We extend our analysis of the leading hadronic contribution to the anomalous magnetic moment of the muon using the mixed representation method to study its chiral behavior. We present results derived from local-conserved two-point lattice vector correlation functions, computed on a subset of light two-flavor ensembles made available to us through the CLS effort with pion masses as low as 190 MeV. The data is analyzed also using the more standard four-momentum method. Both methods are systematically compared as the calculations approach the physical point.

Anthony Francis; Vera Guelpers; Gregorio Herdoiza; Hanno Horch; Benjamin Jaeger; Harvey B. Meyer; Hartmut Wittig

2014-10-28T23:59:59.000Z

102

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

103

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

104

Two-flavor QCD correction to lepton magnetic moments at leading-order in the electromagnetic coupling  

SciTech Connect (OSTI)

We present a reliable nonperturbative calculation of the QCD correction, at leading-order in the electromagnetic coupling, to the anomalous magnetic moment of the electron, muon and tau leptons using two-flavor lattice QCD. We use multiple lattice spacings, multiple volumes and a broad range of quark masses to control the continuum, infinite-volume and chiral limits. We examine the impact of the commonly ignored disconnected diagrams and introduce a modification to the previously used method that results in a well-controlled lattice calculation. We obtain 1.513 (43) 10^-12, 5.72 (16) 10^-8 and 2.650 (54) 10^-6 for the leading-order QCD correction to the anomalous magnetic moment of the electron, muon and tau respectively, each accurate to better than 3%.

Dru Renner, Xu Feng, Karl Jansen, Marcus Petschlies

2011-08-01T23:59:59.000Z

105

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

106

MUON STORAGE RINGS FOR 6D PHASE SPACE COOLING.  

SciTech Connect (OSTI)

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

107

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

108

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

109

SNM detection by active muon interrogation  

SciTech Connect (OSTI)

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

110

Study of the influence of a strong magnetic field on the composition of nuclear matter at high densities and zero temperature  

SciTech Connect (OSTI)

Magnetars are neutron stars with a strong surface magnetic field. Observations of soft gamma-ray and anomalous X-ray pulsars pointed out that the surface magnetic field of magnetars is equal or even greater than 10{sup 15} G. In this work we study the influence of a strong magnetic field on the composition of nuclear matter at high densities and zero temperature. We describe the matter through a relativistic mean-field model with eight light baryons (baryon octet), electrons, muons and with magnetic field. As output of the numerical calculations, we obtain the relative population of each species of particles as function of baryon density.

Coelho, Eduardo L.; Chiapparini, Marcelo [Instituto de Fisica, Universidade do Estado do Rio de Janeiro, 20559-900, Rio de Janeiro, RJ (Brazil); Bracco, Mirian E. [Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, 27537-000, Resende, RJ (Brazil)

2013-03-25T23:59:59.000Z

111

Axions and Anomaly-Mediated Interactions: The Green-Schwarz and Wess-Zumino Vertices at Higher Orders and g-2 of the muon  

E-Print Network [OSTI]

We present a study of the mechanism of anomaly cancellation using only transverse invariant amplitudes on anomaly diagrams at higher perturbative orders. The method is the realization of the Green-Schwarz (GS) mechanism at field theory level, which restores the Ward identities by a subtraction of the anomaly pole. Some of the properties of the GS vertex are analyzed both in the context of unitarity and of the organization of the related perturbative expansion. We investigate the role played by the GS and the Wess-Zumino vertices in the anomalous magnetic moment of the muon and in the hyperfine splitting of muonium, which are processes that can be accompanied by the exchange of a virtual anomalous extra Z-prime and an axion-like particle.

Roberta Armillis; Claudio Coriano'; Marco Guzzi; Simone Morelli

2008-08-13T23:59:59.000Z

112

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

113

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

114

Upper Bound on the Hadronic Light-By-Light Contribution to the Muon g-2  

Science Journals Connector (OSTI)

There are indications that hadronic loops in some electroweak observables are almost saturated by parton level effects. Taking this as the hypothesis for this work, we propose a genuine parton level estimate of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon, a?LBL(had). Our quark mass definitions and values are motivated in detail, and the simplicity of our approach allows for a transparent error estimate. For infinitely heavy quarks our treatment is exact, while for asymptotically small quark masses a?LBL(had) is overestimated. Interpolating, this suggests quoting an upper bound. We obtain a?LBL(had)<1.59×10-9 (95% C.L.).

Jens Erler and Genaro Toledo Sánchez

2006-10-18T23:59:59.000Z

115

Anomalous magnetic behavior in the transition metal ions doped Cu{sub 2}O flower-like nanostructures  

SciTech Connect (OSTI)

Cuprous oxide (Cu{sub 2}O) flower-like nanostructures doped with various metal ions i.e. Fe, Co, Ni and Mn have been synthesized by an organic phase solution method. The powder X-ray diffraction study clearly reveals them as single phase simple cubic cuprite lattice. Study of their magnetic properties have shown that these doped samples are ferromagnetic in nature; however, no such property was observed for the undoped Cu{sub 2}O sample. The magnitude of the ferromagnetic behavior was found to be dependent on the dopant metal ions amount, which increased consistently with its increase. As total magnetic moment contribution of the doped metal ions calculated was insignificant, it is believed to have originated from the induced magnetic moments at cation deficiency sites in the material, created possibly due to the disturbance of the crystal lattice by the dopant ions. The existence of the defects has been supported by photoluminescence spectra of the doped samples. -- Graphical abstract: Room temperature ferromagnetic behavior was observed in the Cu{sub 2}O nanoflowers doped with Fe, Co, Ni and Mn ions. Cation deficiencies formed due to dopant ions were possibly responsible for ferromagnetism. Display Omitted

Ahmed, Asar [Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh (India); Gajbhiye, Namdeo S., E-mail: nsg@iitk.ac.i [Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh (India)

2011-01-15T23:59:59.000Z

116

Multi-muon events at CDF  

SciTech Connect (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{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

117

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

118

muon Collider Notes  

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

119

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

120

The Muon Accelerator Program  

SciTech Connect (OSTI)

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

Rare muon processes  

SciTech Connect (OSTI)

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

122

Rare muon processes  

SciTech Connect (OSTI)

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

123

A VERY FAST RAMPING MUON SYNCHROTRON FOR A NEUTRINO FACTORY.  

SciTech Connect (OSTI)

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

124

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

125

Anomalous - viscosity current drive  

DOE Patents [OSTI]

An apparatus and method for maintaining a steady-state current in a toroidal magnetically confined plasma. An electric current is generated in an edge region at or near the outermost good magnetic surface of the toroidal plasma. The edge current is generated in a direction parallel to the flow of current in the main plasma and such that its current density is greater than the average density of the main plasma current. The current flow in the edge region is maintained in a direction parallel to the main current for a period of one or two of its characteristic decay times. Current from the edge region will penetrate radially into the plasma and augment the main plasma current through the mechanism of anomalous viscosity. In another aspect of the invention, current flow driven between a cathode and an anode is used to establish a start-up plasma current. The plasma-current channel is magnetically detached from the electrodes, leaving a plasma magnetically insulated from contact with any material obstructions including the cathode and anode.

Stix, Thomas H. (Princeton, NJ); Ono, Masayuki (Princeton Junction, NJ)

1988-01-01T23:59:59.000Z

126

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

127

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

128

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

129

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

130

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

131

A Compact and High Performance Muon Capture Channel for Muon Accelerators  

SciTech Connect (OSTI)

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

132

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

133

Competition between magnetism and superconductivity in TmNi{sub 2}B{sub 2}C observed by muon-spin rotation  

SciTech Connect (OSTI)

We report muon-spin-rotation measurements of the internal field in the rare-earth nickel boride carbide superconductor TmNi{sub 2}B{sub 2}C from 100 mK up to well above the superconducting transition temperature ({ital T}{sub {ital c}}=9.5 K). An oscillatory muon response indicates that the muon is affected by a quasistatic local field that follows a {ital T}{sup {minus}1} dependence over a wide temperature range and without interruption at the superconducting transition. The corresponding relaxation rate remains constant in the normal state, but begins to rise very sharply with decreasing temperature below {ital T}{sub {ital c}} scaling approximately with the local field down to its maximum at 2.5 K. The quasistatic internal field may be attributed to a spiral structure or slow three-dimensional correlations of the Tm moments. Decoupling experiments reveal a dynamic depolarization mechanism which may tentatively be ascribed to fast two-dimensional correlations of the Ni moments, slowed by the onset of superconductivity.

Cooke, D.W.; Smith, J.L. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Blundell, S.J.; Chow, K.H.; Pattenden, P.A.; Pratt, F.L. [Clarendon Laboratory, Parks Road, Oxford OX1 3PU (United Kingdom)] [Clarendon Laboratory, Parks Road, Oxford OX1 3PU (United Kingdom); Cox, S.F.J.; Brown, S.R. [ISIS, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX (United Kingdom)] [ISIS, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX (United Kingdom); Morrobel-Sosa, A. [California Polytechnic State University, San Luis Obispo, California 93407 (United States)] [California Polytechnic State University, San Luis Obispo, California 93407 (United States); Lichti, R.L. [Department of Physics, Texas Tech University, Lubbock, Texas 79409 (United States)] [Department of Physics, Texas Tech University, Lubbock, Texas 79409 (United States); Gupta, L.C.; Nagarajan, R.; Hossain, Z. [Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005 (India)] [Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005 (India); Mazumdar, C. [Indian Institute of Technology, Powai, Bombay 400 076 (India)] [Indian Institute of Technology, Powai, Bombay 400 076 (India); Godart, C. [UPR-209, Centre National de la Recherche Scientifique, 92195 Meudon Cedex (France)] [UPR-209, Centre National de la Recherche Scientifique, 92195 Meudon Cedex (France)

1995-08-01T23:59:59.000Z

134

Muon Collider Progress: Accelerators  

SciTech Connect (OSTI)

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

135

The Muon Collider  

SciTech Connect (OSTI)

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

136

Hadronic light-by-light scattering in the muon g-2: A Dyson-Schwinger equation approach  

Science Journals Connector (OSTI)

We determine the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon using the framework of Dyson-Schwinger and Bethe-Salpeter equations of QCD. Our result for the pseudoscalar (?0,?,??) meson-exchange diagram is commensurate with previous calculations. In our calculation of the quark-loop contribution we improve upon previous approaches by explicitly implementing constraints due to gauge invariance. The impact of transverse contributions, presumably dominated by vector-meson poles, are only estimated at this stage. As a consequence, our value a?LBL;quarkloop=(136±59)×10-11 is significantly larger. Taken at face value, this then leads to a revised estimate of the total a?=116?591?891.0(105.0)×10-11.

Tobias Goecke; Christian S. Fischer; Richard Williams

2011-05-04T23:59:59.000Z

137

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

138

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

139

Towards a Muon Collider  

SciTech Connect (OSTI)

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

140

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

142

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

143

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

144

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

145

Muon Reconstruction and Identification in CMS  

SciTech Connect (OSTI)

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

146

The muon g -2: the role of hadronic effects and first lessons from the LHC  

E-Print Network [OSTI]

The muon g - 2: the role of hadronic effects and first lessons from the LHC Fred Jegerlehner fjeger + aµ) Dirac: gµ = 2 , aµ = 2 + · · · muon anomaly (q) µ(p ) µ(p) = (-ie) ¯u(p ) µ F1(q2 ) + i µq 2mµ F.00005) F. Jegerlehner Oberw¨olz, September 2012 3 #12;In a uniform magnetic field, as in muon g - 2

Röder, Beate

147

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

148

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

149

Muon Beam Helical Cooling Channel Design  

SciTech Connect (OSTI)

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

150

Muon Collider Machine-Detector Interface  

SciTech Connect (OSTI)

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

151

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

152

Muon spin rotation in heavy-electron pauli-limit superconductors  

SciTech Connect (OSTI)

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

153

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET  

E-Print Network [OSTI]

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET (IPAC13, THPFI092) The baseline target concept for a Muon Collider or Neutrino Factory is a free 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

McDonald, Kirk

154

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

155

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

156

Role of momentum dependent dressing functions and vector meson dominance in hadronic light-by-light contributions to the muon g-2  

Science Journals Connector (OSTI)

We present a refined calculation of the quark-loop contribution to hadronic light-by-light scattering that focuses upon the impact of the transverse components of the quark-photon vertex. These structures are compared and contrasted with those found within the extended Nambu-Jona-Lasinio models. We discuss similarities and differences between the two approaches and further clarify the important role of momentum dependent dressing functions. As expected, we find that the transverse structures of the quark-photon vertex lead to a suppression of the quark-loop contribution to the anomalous magnetic moment of the muon. However, we find evidence that this suppression is overestimated within models with simple approximations for the quark-photon interaction.

Tobias Goecke; Christian S. Fischer; Richard Williams

2013-02-08T23:59:59.000Z

157

Investigation of the solar influence on the cosmic muon flux using WILLI detector  

SciTech Connect (OSTI)

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

158

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

159

Muon capture for the front end of a muon collider  

SciTech Connect (OSTI)

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

160

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

Modeling Relativistic Muons in Electromagnetic Storage Rings via Object Oriented Techniques  

E-Print Network [OSTI]

.4 Integrator Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.5 The Numerical Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 Documentation-conducting magnet which is used as a muon storage ring. Since it is impossible to control the momentum and location

Oliva, Aude

162

Muon Collider design status  

SciTech Connect (OSTI)

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

163

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

164

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

165

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

166

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

167

Muon colliders and neutrino factories  

SciTech Connect (OSTI)

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

168

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

169

muon_collider  

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

170

Muon Acceleration R and D  

SciTech Connect (OSTI)

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

171

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

172

From Neutrino Factory to Muon Collider  

SciTech Connect (OSTI)

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

173

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

174

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

175

MUON g -2: A MINI REVIEW LAL, Universite Paris-Sud et IN2P3/CNRS,  

E-Print Network [OSTI]

MUON g - 2: A MINI REVIEW Z. Zhang LAL, Universit´e Paris-Sud et IN2P3/CNRS, BP34, 91898 Orsay of the anoma- lous magnetic moment of the muon aµ is briefly reviewed. The emphasis is put on the evalu- ation the experimental one. 1 Introduction For a charged elementary particle with 1/2 intrinsic spin such as muon, its

Boyer, Edmond

176

Hydrogen-filled RF Cavities for Muon Beam Cooling  

SciTech Connect (OSTI)

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

177

Muon Spin Rotation Spectroscopy - Utilizing Muons in Solid State Physics  

SciTech Connect (OSTI)

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

178

An Overview on Muon Physics  

SciTech Connect (OSTI)

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

179

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

180

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

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


181

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

182

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

183

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

184

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

185

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

186

Intense Muon Beams for Experiments at Project X  

SciTech Connect (OSTI)

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

187

Multipass Arc Lattice Design for Recirculating Linac Muon Accelerators  

SciTech Connect (OSTI)

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

188

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

189

Research and Development of Future Muon Collider  

SciTech Connect (OSTI)

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

190

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.

191

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

192

Contribución de leptones exóticos del modelo 331 (ß=-1/?3)al momento magnético anómalo del muón / Contribution of exotic leptons of 331 (ß=-1/?3)model to the anomalous magnetic moment at the muon.  

E-Print Network [OSTI]

??Raba Páez, Ángela Mercedes (2010) Contribución de leptones exóticos del modelo 331 (ß=-1/?3)al momento magnético anómalo del muón / Contribution of exotic leptons of 331… (more)

Raba Páez, Ángela Mercedes

2010-01-01T23:59:59.000Z

193

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

194

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

195

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

196

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

197

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

198

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

199

Pulsed source of ultra low energy positive muons for near-surface ?SR studies  

Science Journals Connector (OSTI)

We have produced a pulsed beam of low energy (ultra slow) polarized positive muons (LE-?+) and performed several demonstration muon spin rotation/relaxation (?SR) experiments at ISIS RIKEN-RAL muon facility in UK. The energy of the muons implanted into a sample is tuneable between 0.1 keV and 18 keV. This allows us to use muons as local magnetic microprobes on a nanometre scale. The control over the implantation depth is from several nanometres to hundreds of nanometres depending on the sample density and muon energy. The LE-?+ are produced by two-photon resonant laser ionization of thermal muonium atoms. Currently ?15 LE-?+/s with 50% spin polarization are transported to the ?SR sample position, where they are focused to a small spot with a diameter of only 4 mm. The overall LE-?+ generation efficiency of 3 × 10?5 is comparable to that obtained when moderating the muon beam to epithermal energies in simple van der Waals bound solids. In contrast to other methods of LE-?+ generation, the implantation of the muons into the sample can be externally triggered with the duration of the LE-?+ pulse being only 7.5 ns. This allows us to measure spin rotation frequencies of up to 40 MHz.

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

2008-01-01T23:59:59.000Z

200

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

SciTech Connect (OSTI)

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

Fermilab | Science | Particle Physics | Muons  

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

202

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

203

Circularly Inclined Solenoid Channel for 6D Ionization Cooling of Muons  

SciTech Connect (OSTI)

Ionization cooling is essential for realization of Muon Collider, muons beam based neutrino factories and other experiments involving muons. The simplest structure - absorber(s) immersed in alternating solenoidal magnetic field - provides only transverse cooling since the longitudinal motion in the most suitable momentum range (2-300MeV/c) is naturally anti-damped. To overcome this difficulty it is proposed to periodically tilt solenoids so that a rotating transverse magnetic field was created. By choosing the phase advance per period above a multiple of 2{pi} it is possible to ensure that muons with higher momentum make a longer path in the absorber (whether distributed or localized) thus providing longitudinal damping. Basic theory of such channel and results of tracking simulations are presented.

Alexahin, Y.; /Fermilab

2009-05-01T23:59:59.000Z

204

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

SciTech Connect (OSTI)

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

205

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

206

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

207

Muon Colliders: The Next Frontier  

SciTech Connect (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

2009-07-29T23:59:59.000Z

208

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

209

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

210

Muon Collaboration Friday Meetings  

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

211

? + SR studies on Sr2CuO2Cl2, La2CuO4 and Nd2CuO4: 2-d magnetism, local fields and muon sitesSR studies on Sr2CuO2Cl2, La2CuO4 and Nd2CuO4: 2-d magnetism, local fields and muon sites  

Science Journals Connector (OSTI)

We compare the temperature dependence of the zero-field muon spin precession frequency observed in Sr2CuO2Cl2 and La2CuO4...below the Néel temperature with a 2-d Heisenberg model with an additional small anisotro...

L. P. Le; G. M. Luke; B. J. Sternlieb; Y. J. Uemura; J. H. Brewer…

1991-02-01T23:59:59.000Z

212

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

213

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

SciTech Connect (OSTI)

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

214

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

215

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

216

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

217

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

218

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

219

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

220

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

MICE: the Muon Ionization Cooling Experiment. Step I: First Measurement of Emittance with Particle Physics Detectors  

E-Print Network [OSTI]

The Muon Ionization Cooling Experiment (MICE) is a strategic R&D project intended to demonstrate the only practical solution to providing high brilliance beams necessary for a neutrino factory or muon collider. MICE is under development at the Rutherford Appleton Laboratory (RAL) in the United Kingdom. It comprises a dedicated beamline to generate a range of input muon emittances and momenta, with time-of-flight and Cherenkov detectors to ensure a pure muon beam. The emittance of the incoming beam will be measured in the upstream magnetic spectrometer with a scintillating fiber tracker. A cooling cell will then follow, alternating energy loss in Liquid Hydrogen (LH2) absorbers to RF cavity acceleration. A second spectrometer, identical to the first, and a second muon identification system will measure the outgoing emittance. In the 2010 run at RAL the muon beamline and most detectors were fully commissioned and a first measurement of the emittance of the muon beam with particle physics (time-of-flight) detectors was performed. The analysis of these data was recently completed and is discussed in this paper. Future steps for MICE, where beam emittance and emittance reduction (cooling) are to be measured with greater accuracy, are also presented.

U. Bravar; M. Bogomilov; Y. Karadzhov; D. Kolev; I. Russinov; R. Tsenov; L. Wang; F. Y. Xu; S. X. Zheng; R. Bertoni; M. Bonesini; R. Mazza; V. Palladino; G. Cecchet; A. de Bari; M. Capponi; A. Iaciofano; D. Orestano; F. Pastore; L. Tortora; S. Ishimoto; S. Suzuki; K. Yoshimura; Y. Mori; Y. Kuno; H. Sakamoto; A. Sato; T. Yano; M. Yoshida; F. Filthaut; M. Vretenar; S. Ramberger; A. Blondel; F. Cadoux; F. Masciocchi; J. S. Graulich; V. Verguilov; H. Wisting; C. Petitjean; R. Seviour; M. Ellis; P. Kyberd; M. Littlefield; J. J. Nebrensky; D. Forrest; F. J. P. Soler; K. Walaron; P. Cooke; R. Gamet; A. Alecou; M. Apollonio; G. Barber; A. Dobbs; P. Dornan; A. Fish; R. Hare; A. Jamdagni; V. Kasey; M. Khaleeq; K. Long; J. Pasternak; H. Sakamoto; T. Sashalmi; V. Blackmore; J. Cobb; W. Lau; M. Rayner; C. D. Tunnell; H. Witte; S. Yang; J. Alexander; G. Charnley; S. Griffiths; B. Martlew; A. Moss; I. Mullacrane; A. Oats; S. York; R. Apsimon; R. J. Alexander; P. Barclay; D. E. Baynham; T. W. Bradshaw; M. Courthold; R. Edgecock T. Hayler; M. Hills; T. Jones; N. McCubbin; W. J. Murray; C. Nelson; A. Nicholls; P. R. Norton; C. Prior; J. H. Rochford; C. Rogers; W. Spensley; K. Tilley; C. N. Booth; P. Hodgson; R. Nicholson; E. Overton; M. Robinson; P. Smith; D. Adey; J. Back; S. Boyd; P. Harrison; J. Norem; A. D. Bross; S. Geer; A. Moretti; D. Neuffer; M. Popovic; Z. Qian; R. Raja; R. Stefanski; M. A. C. Cummings; T. J. Roberts; A. DeMello; M. A. Green; D. Li; A. M. Sessler; S. Virostek; M. S. Zisman; B. Freemire; P. Hanlet; D. Huang; G. Kafka; D. M. Kaplan; P. Snopok; Y. Torun; Y. Onel; D. Cline; K. Lee; Y. Fukui; X. Yang; R. A. Rimmer; L. M. Cremaldi; T. L. Hart; D. J. Summers; L. Coney; R. Fletcher; G. G. Hanson; C. Heidt; J. Gallardo; S. Kahn; H. Kirk; R. B. Palmer

2011-10-09T23:59:59.000Z

222

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

223

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

224

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

225

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

226

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

227

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

228

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

229

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

230

Magnetism  

Science Journals Connector (OSTI)

Historically, magnetism is related to rock magnetism, due to a few minerals exhibiting spontaneous magnetization. Attractive properties of magnetite were already known in Antiquity and were used for navigation...

Guillaume Morin

1998-01-01T23:59:59.000Z

231

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

232

magnetism  

Science Journals Connector (OSTI)

magnetism [A class of physical phenomena associated with moving electricity, including the mutual mechanical forces among magnets and electric currents] ? Magnetismus m

2014-08-01T23:59:59.000Z

233

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

234

Renewal-anomalous-heterogeneous files  

E-Print Network [OSTI]

Renewal-anomalous-heterogeneous files are solved. A simple file is made of Brownian hard spheres that diffuse stochastically in an effective 1D channel. Generally, Brownian files are heterogeneous: the spheres' diffusion coefficients are distributed and the initial spheres' density is non-uniform. In renewal-anomalous files, the distribution of waiting times for individual jumps is exponential as in Brownian files, yet obeys: {\\psi}_{\\alpha} (t)~t^(-1-{\\alpha}), 0renewal as all the particles attempt to jump at the same time. It is shown that the mean square displacement (MSD) in a renewal-anomalous-heterogeneous file, , obeys, ~[_{nrml}]^{\\alpha}, where _{nrml} is the MSD in the corresponding Brownian file. This scaling is an outcome of an exact relation (derived here) connecting probability density functions of Brownian files and renewal-anomalous files. It is also shown that non-renewal-anomalous files are slower than the corresponding renewal ones.

Ophir Flomenbom

2010-08-13T23:59:59.000Z

235

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

236

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

237

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

238

Simulation of large acceptance LINAC for muons  

SciTech Connect (OSTI)

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

239

Escape patterns, magnetic footprints, and homoclinic tangles due to ergodic magnetic limiters  

E-Print Network [OSTI]

to uniformize these fluxes through the cre- ation of chaotic magnetic field lines near the tokamak wall, which to the particle anomalous diffusion in presence of chaotic magnetic field lines. Approaches based in classical,11 The investigation of anomalous transport in the presence of chaotic magnetic field lines often needs the analysis

Rey Juan Carlos, Universidad

240

ELECTRON MODEL OF AN FFAG MUON ACCELERATOR.  

SciTech Connect (OSTI)

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

242

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

243

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

244

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

245

Magnetism  

Science Journals Connector (OSTI)

... dipoles in applied fields". It deals with the classical (Langevin) theory of para-magnetism, anisotropy fields and magnetic measurements. In the next chapter "Atomic structure" the author ... special relevance to ferrites and the inclusion of a quite lengthy discussion of Pauli para-magnetism and of Stoner's treatment of itinerant electron ferromagnetism, though it does much to ...

E. W. LEE

1972-03-31T23:59:59.000Z

246

Accelerating and Retarding Anomalous Diffusion  

E-Print Network [OSTI]

In this paper Gaussian models of retarded and accelerated anomalous diffusion are considered. Stochastic differential equations of fractional order driven by single or multiple fractional Gaussian noise terms are introduced to describe retarding and accelerating subdiffusion and superdiffusion. Short and long time asymptotic limits of the mean squared displacement of the stochastic processes associated with the solutions of these equations are studied. Specific cases of these equations are shown to provide possible descriptions of retarding or accelerating anomalous diffusion.

Chai Hok Eab; S. C. Lim

2012-01-14T23:59:59.000Z

247

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

248

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

249

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

250

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

251

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

252

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

253

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

254

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

255

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

256

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

257

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

258

The US Muon Accelerator Program (MAP)  

SciTech Connect (OSTI)

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

259

The US Muon Accelerator Program (MAP)  

SciTech Connect (OSTI)

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

260

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

262

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

SciTech Connect (OSTI)

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

263

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

264

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

265

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

266

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

267

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET  

E-Print Network [OSTI]

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET V.B. Graves , Oak is a free 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 beam. Modifications

McDonald, Kirk

268

Depolarization of Negative Muons in Low-Z Muonic Atoms with Nonzero Nuclear Spin  

Science Journals Connector (OSTI)

The decay asymmetries resulting from the residual polarization of negative muons were measured in the components of the ground-state hyperfine doublet of Li6, Li7, Be9, B10, and B11 muonic atoms. The results show a characteristic consequence of the muonmucleus magnetic dipole coupling during the muonic cascade.

D. Favart; F. Brouillard; L. Grenacs; P. Igo-Kemenes; P. Lipnik; P. C. Macq

1970-11-09T23:59:59.000Z

269

A new precision experiment to measure the muon g-2 value  

SciTech Connect (OSTI)

A new measurement of the g-2 value of the muon with a sensitivity of .35 parts per million is being prepared at the Brookhaven National Laboratory Alternate Gradient Synchrotron (BNL AGS). The weak interaction contributes significantly to the magnetic moment anomaly at the planned level of sensitivity. 11 refs., 3 figs.

May, M.

1988-01-01T23:59:59.000Z

270

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

271

Magnetic and Electric Dipole Constraints on Extra Dimensions and Magnetic Fluxes  

E-Print Network [OSTI]

The propagation of charged particles and gauge fields in a compact extra dimension contributes to $g-2$ of the charged particles. In addition, a magnetic flux threading this extra dimension generates an electric dipole moment for these particles. We present constraints on the compactification size and on the possible magnetic flux imposed by the comparison of data and theory of the magnetic moment of the muon and from limits on the electric dipole moments of the muon, neutron and electron.

Aaron J. Roy; Myron Bander

2008-05-10T23:59:59.000Z

272

Cosmic Ray Sun Shadow in Soudan 2 Underground Muon Flux  

E-Print Network [OSTI]

The absorption of cosmic rays by the sun produces a shadow at the earth. The angular offset and broadening of the shadow are determined by the magnitude and structure of the interplanetary magnetic field (IPMF) in the inner solar system. We report the first measurement of the solar cosmic ray shadow by detection of deep underground muon flux in observations made during the entire ten-year interval 1989 to 1998. The sun shadow varies significantly during this time, with a $3.3\\sigma$ shadow observed during the years 1995 to 1998.

Soudan 2 Collaboration

1999-05-24T23:59:59.000Z

273

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

274

Status of Studies of Achromat-based 6D Ionization Cooling Rings for Muons  

SciTech Connect (OSTI)

Six dimensional ionization cooling of muons is needed to achieve the necessary luminosity for a muon collider. If that cooling could occur over multiple turns in a closed ring, there would be significant cost savings over a single-pass cooling channel. We report on the status of a cooling ring with achromatic arcs. The achromatic design permits the design to easily switch between a closed ring and a snaking geometry on injection or extraction from the ring. The ring is designed with sufficient space in each superperiod for injection and extraction magnets. We describe the ring's lattice design, performance, and injection/extraction requirements.

Ding, X.; Kirk, H.; Cline, D.; Garren, A.A.; Berg, J.S.

2011-09-04T23:59:59.000Z

275

Zero-field Spin Depolarization of Low-Energy Muons in Ferromagnetic Nickel and Silver Metal  

Science Journals Connector (OSTI)

We present zero-field muon-spin depolarization measurements in nickel and silver performed using low-energy muon-spin relaxation technique.Ni or Ag are usually used in this depth-resolved technique as a backing material to enable background subtraction when studying small crystals or materials with weak magnetism. The depolarization rate of the asymmetry in silver and that of the slow relaxing part of the asymmetry in nickel are small(? 0.05 ?s?1), and weakly temperature and energy-dependent.

H. Saadaoui; Z. Salman; T. Prokscha; A. Suter; B.M. Wojek; E. Morenzoni

2012-01-01T23:59:59.000Z

276

Magnetism  

Science Journals Connector (OSTI)

... THIS is a good book, and we are glad to see the subject of magnetism fully treated in a popularly written text-book. It is a second edition of ... of importance, accuracy, and exhaustiveness, places the present treatise, as far as terrestrial magnetism is concerned, much before any similar book with which we are acquainted. The correction ...

JAMES STUART

1872-03-07T23:59:59.000Z

277

Recirculating Linac Accelerators For Future Muon Facilities  

SciTech Connect (OSTI)

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

278

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

279

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

280

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

282

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

283

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

284

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

285

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

SciTech Connect (OSTI)

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

286

Muons in minimum bias events from the first CMS data  

SciTech Connect (OSTI)

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

287

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

288

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

289

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

290

From Neutrino Factory to Muon Collider  

SciTech Connect (OSTI)

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

291

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

292

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

293

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

294

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

295

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

296

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

297

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

298

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

299

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

300

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

302

High Field Magnet R&D |Superconducting Magnet Division  

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

High Field Magnet R&D High Field Magnet R&D The Superconducting Magnet Division is developing advanced magnet designs and magnet-related technologies for high field accelerator magnets. We are currently working on magnets for three inter-related programs: High Field Magnets for Muon Collider Papers, Presentations Common Coil Magnets Papers, Presentations Interaction Region Magnets Papers, Presentations High Temperature Superconductor (HTS) Magnets Papers, Presentations This is part of a multi-lab superconducting magnet development program for new accelerator facilities that would be part of the U.S. High Energy Physics program. These programs (@BNL, @FNAL, @LBNL) are quite complimentary to each other, so that magnet designs and technologies developed at one laboratory can be easily transferred to another. The BNL

303

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

304

magnets  

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

I I Painless Physics Articles BEAM COOLING August 2, 1996 By Leila Belkora, Office of Public Affairs ACCELERATION August 16, 1996 By Dave Finley, Accelerator Division Head RF August 30, 1996 By Pat Colestock, Accelerator Division FIXED TARGET PHYSICS September 20, 1996 By Peter H. Garbincius, Physics Section FIXED TARGET PHYSICS PART DEUX October 16, 1996 By Peter H. Garbincius, Physics Section and Leila Belkora, Office of Public Affaris CROSS SECTION November 1, 1996 By Doreen Wackeroth, Theoretical Physics Edited by Leila Belkora, Office of Public Affaris MAGNETS PART I November 15, 1996 By Hank Glass, Technical Support Section Edited by Donald Sena, Office of Public Affairs MAGNETS PART II January 10, 1997 By Hank Glass, Technical Support Section Edited by Donald Sena, Office of Public Affairs

305

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

306

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

307

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

SciTech Connect (OSTI)

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

308

Localized Magnetic States in Graphene  

Science Journals Connector (OSTI)

We examine the conditions necessary for the presence of localized magnetic moments on adatoms with inner shell electrons in graphene. We show that the low density of states at the Dirac point, and the anomalous broadening of the adatom electronic level, lead to the formation of magnetic moments for arbitrarily small local charging energy. As a result, we obtain an anomalous scaling of the boundary separating magnetic and nonmagnetic states. We show that, unlike any other material, the formation of magnetic moments can be controlled by an electric field effect.

Bruno Uchoa; Valeri N. Kotov; N. M. R. Peres; A. H. Castro Neto

2008-07-11T23:59:59.000Z

309

Parametric-resonance ionization cooling of muon beams  

SciTech Connect (OSTI)

Parametric-resonance Ionization Cooling (PIC) is proposed as the final 6D cooling stage of a high-luminosity muon collider. Combining muon ionization cooling with parametric resonant dynamics should allow an order of magnitude smaller final equilibrium transverse beam emittances than conventional ionization cooling alone. In this scheme, a half-integer parametric resonance is induced in a cooling channel causing the beam to be naturally focused with the period of the channel's free oscillations. Thin absorbers placed at the focal points then cool the beam's angular divergence through the usual ionization cooling mechanism where each absorber is followed by RF cavities. A special continuous-field twin-helix magnetic channel with correlated behavior of the horizontal and vertical betatron motions and dispersion was developed for PIC. We present the results of modeling PIC in such a channel using GEANT4/G4beamline. We discuss the challenge of precise beam aberration control from one absorber to another over a wide angular spread.

Morozov, V. S.; Derbenev, Ya. S.; Afanasev, A.; Johnson, R. P.; Erdelyi, B.; Maloney, J. A. [Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States); Muons, Inc., Batavia, Illinois 60510 (United States) and George Washington University, Washington, D.C. 20052 (United States); Muons, Inc., Batavia, Illinois 60510 (United States); Northern Illinois University, DeKalb, Illinois 60115 (United States)

2012-12-21T23:59:59.000Z

310

Parametric-Resonance Ionization Cooling of Muon Beams  

SciTech Connect (OSTI)

Parametric-resonance Ionization Cooling (PIC) is proposed as the final 6D cooling stage of a high-luminosity muon collider. Combining muon ionization cooling with parametric resonant dynamics should allow an order of magnitude smaller final equilibrium transverse beam emittances than conventional ionization cooling alone. In this scheme, a half-integer parametric resonance is induced in a cooling channel causing the beam to be naturally focused with the period of the channel's free oscillations. Thin absorbers placed at the focal points then cool the beam?s angular divergence through the usual ionization cooling mechanism where each absorber is followed by RF cavities. A special continuous-field twin-helix magnetic channel with correlated behavior of the horizontal and vertical betatron motions and dispersion was developed for PIC. We present the results of modeling PIC in such a channel using GEANT4/ G4 beamline. We discuss the challenge of precise beam aberration control from one absorber to another over a wide angular spread.

Morozov, V. S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Derbenev, Ya. S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Afanasev, A. [Muons, Inc., Batavia, IL (United States) and George Washington University, Washington, D.C. (United States); Johnson, R. P. [Muons, Inc., Batavia, IL (United States); Erdelyi, B. [Northern Illinois University, DeKalb, IL (United States); Maloney, J. A. [Northern Illinois University, DeKalb, IL (United States)

2012-12-01T23:59:59.000Z

311

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

312

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

313

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

314

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

315

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

316

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

317

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

318

-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

319

Strongest Pulsed Muon Source at J-PARC MUSE  

SciTech Connect (OSTI)

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

320

Study of high pressure gas filled RF cavities for muon collider  

E-Print Network [OSTI]

Muon collider is a considerable candidate of the next-generation high-energy lepton collider machine. Operating an RF cavity in a multi-Tesla magnet is a critical requirement in a muon accelerator and a cooling channel. However, the maximum RF gradient in a vacuum RF cavity is strongly limited by an external magnetic field. Dense hydrogen gas filled RF cavity has been proposed since it is functional of generating a high RF accelerating gradient in a strong magnetic field and making an ionization cooling process at the same time. A critical issue of the cavity is a beam- induced plasma that consumes a considerable amount of RF power. The gas filled RF test cell was made and measured the RF loading due to a beam-induced plasma by using an intense proton beam at Fermilab. By doping an electronegative gas in dense hydrogen, the plasma loading effect is significantly mitigated. The result shows that the cavity is functional with a muon collider beam. Recent progress is shown in this presentation.

Yonehara, Katsuya

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

322

Studies of muon-induced radioactivity at NuMI  

SciTech Connect (OSTI)

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

323

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

324

Anomalous electron heat transport driven by low frequency electromagnetic turbulence  

SciTech Connect (OSTI)

We consider the anomalous electron and heat transport in a tokamak plasma. The electrons are described by the nonlinear drift-kinetic equation. We analyze transport through the averaged response function in the presence of drift-Alfven wave turbulence. In contrast to recent findings by Terry, Diamond, and Hahm, we conclude that magnetic fluctuations lead to a substantial transport of both parallel and perpendicular energies. The latter, previously neglected, is found to be significant and of the order of the test-particle diffusion.

Thoul, A.A.; Similon, P.L.; Sudan, R.N.

1987-09-28T23:59:59.000Z

325

Anomalous  

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

cyclotron resonant ECR damping of Alfvn waves, viscous damping, 6 stochastic heating, 5,7 ion cyclotron damping of Alfvn waves, 8 heating from slow wave continuua, 9...

326

Numerical study of a bucked-coil system for muon transport and cooling  

SciTech Connect (OSTI)

A Neutrino Factory, which can deliver an intense flux of {approx}10{sup 21} neutrinos per year from a multi-GeV stored muon-beam is seemingly the ideal tool for studying neutrino oscillations and CP-violations for leptons. The front-end of this facility plays a critical role in determining the number of muons that can be accepted by the downstream accelerators. Delivering peak performance requires transporting the muon beams through long sections of a beam channel containing high-gradient rf cavities and strong focusing solenoids. Here, we propose a novel scheme to improve the performance of the cavities, thereby increasing the number of muons within the acceptance of the accelerator chain. The key element of our new scheme is to apply a set of bucked coils along the lattice, thus forcing the external magnetic field to drop substantially within the cavity. We incorporate this idea into a new lattice design for a Neutrino Factory, and detail its performance numerically.

Stratakis, Diktys; Alekou, Androula; Neuffer, David; Pasternak, Jaroslaw; Rogers, Chris T. [Brookhaven National Laboratory, Department of Physics, Upton, NY 11973 (United States); Imperial College London, Blackett Laboratory, Prince Consort Rd, London, SW7 2BW (United Kingdom); Fermi National Acceleartor Laboratory, Batavia, IL 60510 (United States); Imperial College London, Blackett Laboratory, Prince Consort Rd, London, SW7 2BW (United Kingdom) and Rutherford Appleton Laboratory, Chilton, Didcot (United Kingdom); Rutherford Appleton Laboratory, Chilton, Didcot (United Kingdom)

2012-12-21T23:59:59.000Z

327

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

328

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

329

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

330

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

331

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

332

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.

333

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

334

PROTON BEAM REQUIREMENTS FOR A NEUTRINO FACTORY AND MUON COLLIDER  

SciTech Connect (OSTI)

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

335

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

336

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

337

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

338

Muon Fluence Measurements for Homeland Security Applications  

SciTech Connect (OSTI)

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

339

Muon Tracking to Detect Special Nuclear Materials  

SciTech Connect (OSTI)

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

340

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

Fermilab | Muon Collider | Reports and Papers  

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

342

Kinetic studies of anomalous transport  

SciTech Connect (OSTI)

Progress in achieving a physics-based understanding of anomalous transport in toroidal systems has come in large part from investigations based on the proposition that low frequency electrostatic microinstabilities are dominant in the bulk ( confinement'') region of these plasmas. Although the presence here of drift-type modes dependent on trapped particle and ion temperature gradient driven effects appears to be consistent with a number of important observed confinement trends, conventional estimates for these instabilities cannot account for the strong current (I{sub p}) and /or q-scaling frequently found in empirically deduced global energy confinement times for auxiliary-heated discharges. The present paper deals with both linear and nonlinear physics features, ignored in simpler estimates, which could introduce an appreciable local dependence on current. It is also pointed out that while the thermal flux characteristics of drift modes have justifiably been the focus of experimental studies assessing their relevance, other transport properties associated with these microinstabilities should additionally be examined. Accordingly, the present paper provides estimates and discusses the significance of anomalous energy exchange between ions and electrons when fluctuations are present. 19 refs., 3 figs.

Tang, W.M.

1990-11-01T23:59:59.000Z

343

Characterisation of the muon beams for the Muon Ionisation Cooling Experiment  

SciTech Connect (OSTI)

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

344

Magnetic line trapping and effective transport in stochastic magnetic fields  

Science Journals Connector (OSTI)

The transport of collisional particles in stochastic magnetic fields is studied using the decorrelation trajectory method. The nonlinear effect of magnetic line trapping is considered together with particle collisions. The running diffusion coefficient is determined for arbitrary values of the statistical parameters of the stochastic magnetic field and of the collisional velocity. The effect of the magnetic line trapping is determined. New anomalous diffusion regimes are found.

M. Vlad; F. Spineanu; J. H. Misguich; R. Balescu

2003-02-07T23:59:59.000Z

345

Anomalous effects and possible environmental symmetry "violation" in heavy-ion collisions  

E-Print Network [OSTI]

The heavy ion collision provides a unique many-body environment where local domains of strongly interacting chiral medium may occur and in a sense allow environmental symmetry "violation" pheomena. We briefly review recent progress in both the theoretical understanding and experimental search of various anomalous transport effects (such as the Chiral Magnetic Effect, Chiral Separation Effect, Chiral Electric Separation Effect, Chiral Electric/Magnetic Waves, etc) in the hot QCD fluid created by such experiments.

Jinfeng Liao

2014-01-11T23:59:59.000Z

346

Complete Muon Cooling Channel Design and Simulations  

SciTech Connect (OSTI)

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

347

Complete Muon Cooling Channel Design and Simulations  

SciTech Connect (OSTI)

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

348

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

349

Magnetic and Cryogenic Design of the MICE Coupling Solenoid Magnet System  

SciTech Connect (OSTI)

The Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling in a short section of a realistic cooling channel using a muon beam at Rutherford Appleton Laboratory in the UK. The coupling magnet is a superconducting solenoid mounted around four 201MHz RF cavities, which produces magnetic field up to 2.6 T on the magnet centerline to keep muons within the iris of RF cavities windows. The coupling coil with inner radius of 750mm, length of 285mm and thickness of 102.5mm will be cooled by a pair of 1.5 W at 4.2 K small coolers. This paper will introduce the updated engineering design of the coupling magnet made by ICST in China. The detailed analyses on magnetic fields, stresses induced during the processes of winding, cool down and charging, and cold mass support assembly are presented as well.

Wang, Li; Xu, FengYu; Wu, Hong; Liu, XiaoKum; Li, LanKai; Guo, XingLong; Chen, AnBin; Green, Michael A; Li, D.R.; Virostek, Steve; Pan, H.

2008-08-02T23:59:59.000Z

350

Low energy muons as probes of thin films and near surface regions  

Science Journals Connector (OSTI)

Questions involving thin films, multilayered samples, surfaces and interfaces are generally not accessible by the conventional sources delivering muons with kinetic energy ?4 MeV. The muon as a sensitive local magnetic and spin probe with complementary observational time window to other probes and techniques is able to offer unique new insights into these objects of investigations. Low energy muons (LE-?+) with tunable energy between ?0.5 and 30 keV penetrate only to a depth between a few and few hundreds of nm depending on their energy. Hence they provide the desired non-destructive, non-invasive and microscopic probe for local investigations of properties near surfaces and in thin samples. The intensity of the LE-?+ source at PSI and the capability of the sample environment have been steadily evolving over the past years and the flux at the sample has now reached intensities of more than 700 ?+/s. After a summary of the most recent developments we give a brief overview of the experimental program together with some anticipated applications. The measurement of the value of local magnetic fields as a function of position below a surface on a scale of a few nm, which has provided the first direct confirmation of the London formula and has the potential to yield information crucial to understanding the details of the superconducting state, has been used to map films of non-conventional and conventional superconductors. Investigations of magnetic systems range from the first studies of magnetic properties of buried thin films to investigations of dimensional effects in a single spin glass layer and interlayer coupling in magnetic-nonmagnetic systems. The future prospects of this technique are outlined. To optimize the flux of LE-?+ at PSI a new, dedicated surface muon beam line has been designed. It is presently under construction and will be installed in 2003/2004. The predicted intensity increase by a factor of about ten will contribute to the realization of the full potential of polarized muons used as nanoprobes.

E Morenzoni; R Khasanov; H Luetkens; T Prokscha; A Suter; N Garifianov; H Glückler; M Birke; E Forgan; H Keller; J Litterst; Ch Niedermayer; G Nieuwenhuys

2003-01-01T23:59:59.000Z

351

Chapter 12. The Muon Kicker  

E-Print Network [OSTI]

5 meters. An electrostatic kicker needs on the order of 400 kV to accomplish the kick. A magnetic kicker with a current loop requires less than 70 kV if the kicker is divided up to four sections switch, an energy­dissipating resistor and a short transmission line to connect the module to its vacuum

Brookhaven National Laboratory - Experiment 821

352

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

353

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

354

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

355

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

356

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

357

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

358

Anomalous Emission from HII regions  

E-Print Network [OSTI]

Spinning dust appears to be the best explanation for the anomalous emission that has been observed at $\\sim 10-60$ GHz. One of the best examples of spinning dust comes from a HII region in the Perseus molecular cloud. Observations of other HII regions also show tentative evidence for excess emission at frequencies $\\sim 30$ GHz, although at lower emissivity levels. A new detection of excess emission at 31 GHz in the HII region RCW175 has been made. The most plausible explanation again comes from spinning dust. HII regions are a good place to look for spinning dust as long as accurate radio data spanning the $\\sim 5-100$ GHz range is available.

C. Dickinson

2008-08-04T23:59:59.000Z

359

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

360

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

362

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

363

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

364

Feasibility of Injection/Extraction Systems for Muon FFAG Rings in the Neutrino Factory  

SciTech Connect (OSTI)

Non-scaling FFAG rings have been proposed for muon acceleration in a neutrino factory. In order to achieve small orbit excursion and small time of flight variation, lattices with a very compact cell structure and short straight sections are required. The resulting geometry places very challenging constraints on the injection/extraction systems. The feasibility of injection/extraction is discussed and various implementations focusing on minimization of kicker/septum strength are presented. The injection and extraction systems in the nonscaling FFAG for muon acceleration in a neutrino factory were studied in the ring based on FODO lattice. The vertical direction was found to be preferential for both injection and extraction, which allows for lower kicker strengths and facilitates the distribution of kickers due to a lower phase advance per cell in comparison with the horizontal plane. It is possible to design mirror-symmetric schemes in which the kickers can be reused for both signs of muons. The disadvantage of these solutions is a need for special magnets with large aperture in the injection/extraction region due to the large kicked beam oscillations. The strengths of the required kickers are still very challenging and the fields in the septum magnets dictates the need for a superconducting design.

Pasternak, J.; Berg, J.; Aslaninejad, M.; Kelliher, D.; Machida, S.

2010-12-01T23:59:59.000Z

365

Search for anomalous production of multiple leptons in association with $W$ and $Z$ bosons at CDF  

SciTech Connect (OSTI)

This paper presents a search for anomalous production of multiple low-energy leptons in association with a W or Z boson using events collected at the CDF experiment corresponding to 5.1 fb{sup -1} of integrated luminosity. This search is sensitive to a wide range of topologies with low-momentum leptons, including those with the leptons near one another. The observed rates of production of additional electrons and muons are compared with the standard model predictions. No indications of phenomena beyond the standard model are found. A 95% confidence level limit is presented on the production cross section for a benchmark model of supersymmetric hidden-valley Higgs production. Particle identification efficiencies are also provided to enable the calculation of limits on additional models.

Aaltonen, T.; /Helsinki Inst. of Phys.; Alvarez Gonzalez, B.; /Oviedo U. /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U. /Fermilab; Annovi, A.; /Frascati; Antos, J.; /Comenius U.; Apollinari, G.; /Fermilab; Appel, J.A.; /Fermilab; Arisawa, T.; /Waseda U.; Artikov, A.; /Dubna, JINR /Texas A-M

2012-02-01T23:59:59.000Z

366

Anomalous transport through porous and fractured media  

E-Print Network [OSTI]

Anomalous transport, understood as the nonlinear scaling with time of the mean square displacement of transported particles, is observed in many physical processes, including contaminant transport through porous and fractured ...

Kang, Peter Kyungchul

2014-01-01T23:59:59.000Z

367

Perturbative renormalization of staggered fermion operators with stout improvement: Application to the magnetic susceptibility of QCD  

E-Print Network [OSTI]

We calculate the fermion propagator and the quark-antiquark Green's functions for a complete set of ultralocal fermion bilinears, ${{\\cal O}_\\Gamma}$ [$\\Gamma$: scalar (S), pseudoscalar (P), vector (V), axial (A) and tensor (T)], using perturbation theory up to one-loop and to lowest order in the lattice spacing. We employ the staggered action for fermions and the Symanzik Improved action for gluons. From our calculations we determine the renormalization functions for the quark field and for all ultralocal taste-singlet bilinear operators. The novel aspect of our calculations is that the gluon links which appear both in the fermion action and in the definition of the bilinears have been improved by applying a stout smearing procedure up to two times, iteratively. Compared to most other improved formulations of staggered fermions, the above action, as well as the HISQ action, lead to smaller taste violating effects. The renormalization functions are presented in the RI$'$ scheme; the dependence on all stout parameters, as well as on the coupling constant, the number of colors, the lattice spacing, the gauge fixing parameter and the renormalization scale, is shown explicitly. We apply our results to a nonperturbative study of the magnetic susceptibility of QCD at zero and finite temperature. In particular, we evaluate the "tensor coefficient", $\\tau$, which is relevant to the anomalous magnetic moment of the muon.

G. S. Bali; F. Bruckmann; M. Constantinou; M. Costa; G. Endrodi; S. D. Katz; H. Panagopoulos; A. Schafer

2013-11-14T23:59:59.000Z

368

Novel linac structures for low-beta ions and for muons  

SciTech Connect (OSTI)

Development of two innovative linacs is discussed. (1) High-efficiency normal-conducting accelerating structures for ions with beam velocities in the range of a few percent of the speed of light. Two existing accelerator technologies - the H-mode resonator cavities and transverse beam focusing by permanent-magnet quadrupoles (PMQ) - are merged to create efficient structures for light-ion beams of considerable currents. The inter-digital H-mode accelerator with PMQ focusing (IH-PMQ) has the shunt impedance 10-20 times higher than the standard drift-tube linac. Results of the combined 3-D modeling for an IH-PMQ accelerator tank - electromagnetic computations, beam-dynamics simulations, and thermal-stress analysis - are presented. H-PMQ structures following a short RFQ accelerator can be used in the front end of ion linacs or in stand-alone applications like a compact mobile deuteron-beam accelerator up to a few MeV. (2) A large-acceptance high-gradient linac for accelerating low-energy muons in a strong solenoidal magnetic field. When a proton beam hits a target, many low-energy pions are produced almost isotropically, in addition to a small number of high-energy pions in the forward direction. We propose to collect and accelerate copious muons created as the low-energy pions decay. The acceleration should bring muons to a kinetic energy of {approx}200 MeV in about 10 m, where both an ionization cooling of the muon beam and its further acceleration in a superconducting linac become feasible. One potential solution is a normal-conducting linac consisting of independently fed O-mode RF cavities with wide apertures closed by thin metal windows or grids. The guiding magnetic field is provided by external superconducting solenoids. The cavity choice, overall linac design considerations, and simulation results of muon acceleration are presented. Potential applications range from basic research to homeland defense to industry and medicine.

Kurennoy, Sergey S [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

369

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

370

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

371

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

372

Muon RLA - design status and simulations  

SciTech Connect (OSTI)

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

373

MICE Spectrometer Magnet System Progress  

SciTech Connect (OSTI)

The first magnets for the muon ionization cooling experimentwill be the tracker solenoids that form the ends of the MICE coolingchannel. The primary purpose of the tracker solenoids is to provide auniform 4 T field (to better than +-0.3 percent over a volume that is 1meter long and 0.3 meters in diameter) spectrometer magnet field for thescintillating fiber detectors that are used to analyze the muons in thechannel before and after ionization cooling. A secondary purpose for thetracker magnet is the matching of the muon beam between the rest of theMICE cooling channel and the uniform field spectrometer magnet. Thetracker solenoid is powered by three 300 amp power supplies. Additionaltuning of the spectrometer is provided by a pair of 50 amp power suppliesacross the spectrometer magnet end coils. The tracker magnet will becooled using a pair of 4 K pulse tube coolers that each provide 1.5 W ofcooling at 4.2 K. Final design and construction of the tracker solenoidsbegan during the summer of 2006. This report describes the progress madeon the construction of the tracker solenoids.

Green, Michael A.; Virostek, Steve P.

2007-08-27T23:59:59.000Z

374

Recent results from COMPASS muon scattering measurements  

SciTech Connect (OSTI)

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

375

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

376

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

377

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

378

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

379

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

380

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

382

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

383

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

384

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

385

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.

386

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

387

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

388

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

389

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

390

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

391

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

392

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

393

The performance of the MICE muon beam line  

SciTech Connect (OSTI)

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

394

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

395

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

396

Muon Spin Relaxation Studies of Magnetic-Field-Induced Effects...  

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

Pb 2 Sr 2 CaCu 2 O 8 (Bi2212), in which the relaxation can be explained in terms of the penetration depth &21; in the superconducting state. A slight reduction of the relaxation...

397

E-Print Network 3.0 - anomalous gravity-superconductors interactions...  

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

anomalous surface eddy wind field... analysis suggests that the eddy response to the MJO heating drives both an anomalous meridional circulation... that excites the anomalous...

398

Solenoid magnet system for the Fermilab Mu2e experiment  

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

The Fermilab Mu2e experiment seeks to measure the rare process of direct muon to electron conversion in the field of a nucleus. Key to the design of the experiment is a system of three superconducting solenoids; a muon production solenoid (PS) which is a 1.8 m aperture axially graded solenoid with a peak field of 5 T used to focus secondary pions and muons from a production target located in the solenoid aperture; an 'S shaped' transport solenoid (TS) which selects and transports the subsequent muons towards a stopping target; a detector solenoid (DS) which is an axially graded solenoid at the upstream end to focus transported muons to a stopping target, and a spectrometer solenoid at the downstream end to accurately measure the momentum of the outgoing conversion elections. The magnetic field requirements, the significant magnetic coupling between the solenoids, the curved muon transport geometry and the large beam induced energy deposition into the superconducting coils pose significant challenges to the magnetic, mechanical, and thermal design of this system. In this paper a conceptual design for the magnetic system which meets the Mu2e experiment requirements is presented.

Lamm, M J [Fermilab; Andreev, N [Fermilab /Boston U.; Ambrosio, G [Fermilab; Brandt, J [Fermilab; Coleman, R [CERN; Evbota, D [Fermilab; Kashikhin, V V [City Coll., N.Y.; Lopes, M [Fermilab; Miller, J [Fermilab; Nicol, T [KEK; Ostojic, R [Tsukuba

2012-06-08T23:59:59.000Z

399

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

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

400

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

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

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

402

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

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

403

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

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

404

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

405

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

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

406

ON THE SOURCE OF ASTROMETRIC ANOMALOUS REFRACTION  

SciTech Connect (OSTI)

More than a century ago, astronomers using transit telescopes to determine precise stellar positions were hampered by an unexplained periodic shifting of the stars they were observing. With the advent of CCD transit telescopes in the past three decades, this unexplained motion, termed 'anomalous refraction' by these early astronomers, is again being observed. Anomalous refraction is described as a low-frequency, large angular scale ({approx}2 Degree-Sign ) motion of the entire image plane with respect to the celestial coordinate system as observed and defined by astrometric catalogs. These motions, of typically several tenths of an arcsecond amplitude with timescales on the order of 10 minutes, are ubiquitous to ground-based drift-scan astrometric measurements regardless of location or telescopes used and have been attributed to the effect of tilting of equal-density layers of the atmosphere. The cause of this tilting has often been attributed to atmospheric gravity waves, but this cause has never been confirmed. Although theoretical models of atmospheric refraction show that atmospheric gravity waves are a plausible cause of anomalous refraction, an observational campaign specifically directed at defining this relationship provides clear evidence that anomalous refraction is not consistent with the passage of atmospheric gravity waves. The source of anomalous refraction is found to be meter-scale, slowly evolving quasi-coherent dynamical structures in the boundary layer below 60 m above ground level.

Taylor, M. Suzanne [Department of Natural and Environmental Sciences, Western State Colorado University, 128 Hurst Hall, Gunnison, CO 81230 (United States); McGraw, John T.; Zimmer, Peter C. [Department of Physics and Astronomy, University of New Mexico, MSC07 4220, Albuquerque, NM 87131 (United States); Pier, Jeffrey R., E-mail: mstaylor@western.edu [Division of Astronomical Sciences, NSF 4201 Wilson Blvd, Arlington, VA 22230 (United States)

2013-03-15T23:59:59.000Z

407

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

SciTech Connect (OSTI)

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

408

A Lattice for a Hybrid Fast-Ramping Muon Accelerator to 750 GeV  

SciTech Connect (OSTI)

We describe a lattice for accelerating muons from 375 GeV to 750 GeV. The lattice is a fast-ramping synchrotron with a mixture of fixed-field superconducting dipoles and warm dipoles, so as to have a high average bending field while still being able to rapidly change the average bending field as the beam momentum increases. For a 1.5 TeV center of mass muon collider, muons must be rapidly accelerated to 750 GeV. To accomplish this efficiently, we wish to make as many passes through the RF cavities as possible, while keeping the average RF gradients sufficiently high to avoid excess muon decays. A synchrotron where the magnets are very rapidly ramped has been envisioned as one option to accomplish this. The entire acceleration cycle takes place in less than 1 ms, presenting a technological challenge for the magnets. Clearly superconducting magnets cannot be ramped on this time scale, so instead room-temperature magnets will be ramped. To keep losses low, dipoles can use grain-oriented silicon steel, but quadrupoles will probably need to use more conventional steel, giving a lower maximum field for these high ramping rates. If we want to have a large average RF gradient and simultaneously make a large number of passes through the RF cavities, the average bending field must be high. To achieve such a large bending field while rapidly ramping magnets, it has been proposed to use a hybrid lattice consisting of interleaved superconducting dipoles and bipolar ramped dipoles. Due to the large single-bunch current and the relatively small apertures we desire (both because we would like to use high-frequency RF, and because power requirements and heating will be more reasonable for smaller aperture ramped magnets), collective effects are expected to be very significant. To reduce their effects, we propose to have strong synchrotron oscillations (a synchrotron tune of over 1). To have such a high synchrotron tune, a large number of superperiods are needed. Putting together all of these requirements, a set of requirements for a final acceleration stage for a muon collider has been proposed in Table 1. These basic requirements and some basics of the lattice structure for such a machine were decided upon at a workshop in April 2011 at the University of Mississippi, Oxford. Each superperiod consists of 6 arc cells, two sets of 2-cell dispersion suppressors, and three straight cells, for a total of 13 cells. Every cell has a FODO lattice structure. Each cell has a phase advance of {pi}/2 in both the horizontal and vertical planes. The magnets will have their fields ramped with time so as to keep the cell tunes constant. All dipole magnets are rectangular. The quadrupoles are split into two pieces to allow the eventual insertion of sextupoles for chromaticity correction. The arc cell is described, and its lattice functions are plotted. In the arc cells, the fields will be set to keep the on-energy closed orbit centered in the quadrupoles and in the drift at the center of each half cell. The behavior of the off-energy orbits is shown. At the energy extremes, the ramped fields take on the values given in Table 3.

Garren, A.A.; Berg, J.

2011-09-06T23:59:59.000Z

409

Time-space fabric underlying anomalous diffusion  

E-Print Network [OSTI]

This study unveils the time-space transforms underlying anomalous diffusion process. Based on this finding, we present the two hypotheses concerning the effect of fractal time-space fabric on physical behaviors and accordingly derive fractional quantum relationships between energy and frequency, momentum and wavenumber which further give rise to fractional Schrodinger equation. As an alternative modeling approach to the standard fractional derivatives, we introduce the concept of the Hausdorff derivative underlying the Hausdorff dimensions of metric spacetime. And in terms of the proposed hypotheses, the Hausdorff derivative is used to derive a linear anomalous transport-diffusion equation underlying anomalous diffusion process. Its Green's function solution turns out to be a new type of stretched Gaussian distribution and is compared with that from the Richardson's diffusion equation.

W Chen

2005-05-08T23:59:59.000Z

410

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

411

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

412

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

413

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

414

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

415

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

416

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

417

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

418

PHYSICS AT HIGH LUMINOSITY MUON COLLIDERS AND A FACILITY OVERVIEW.  

SciTech Connect (OSTI)

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

419

Magnetized baryonic matter in holographic QCD  

E-Print Network [OSTI]

We investigate the properties of the Sakai-Sugimoto model at finite magnetic field and baryon chemical potentials. We show that in a finite magnetic field, there exists a spatially homogeneous configuration carrying finite baryon number density. At low magnetic field and baryon chemical potential the equation of state of the matter coincides with that obtained from the chiral perturbation theory Lagrangian with an anomalous term. We discuss the behavior of the system at larger magnetic fields.

Ethan G. Thompson; Dam T. Son

2008-06-02T23:59:59.000Z

420

Use of proportional tubes in a muon polarimeter  

SciTech Connect (OSTI)

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

Frictional Cooling Scheme for Use in a Muon Collider  

SciTech Connect (OSTI)

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

422

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

423

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

424

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

425

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

426

Micromegas chambers for the ATLAS Muon Spectrometer Upgrade  

E-Print Network [OSTI]

Micromegas (Micro MEsh Gaseous Structure) chambers have been proven along the years to be reliable fast detectors with an excellent spatial resolution. The ATLAS collaboration at LHC has chosen the micromegas technology along with the small-strip Thin Gap Chambers (sTGC) for the high luminosity upgrade of the inner muon station in the high-rapidity region, the so called New Small Wheel (NSW). It employs eight layers of micromegas detectors and eight layers of sTGC. The NSW project requires fully efficient micromegas chambers with spatial resolution down to $100\\mu m$ over a total active area of $1200 m^2$ with a rate capability up to $10 kHz/cm^2$ and operation in a moderate magnetic field up to B=0.3 T. The required tracking capability is provided by the intrinsic space resolution combined with a mechanical precision at the level of $30 \\mu m$ along the precision coordinate. Moreover together with the precise tracking capability the micromegas chambers should provide a trigger signal. An extensive R&D pr...

Ntekas, Konstantinos; The ATLAS collaboration

2014-01-01T23:59:59.000Z

427

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…

428

Generic Wave-Function Description of Fractional Quantum Anomalous Hall States and Fractional Topological Insulators  

Science Journals Connector (OSTI)

We propose a systematical approach to construct generic fractional quantum anomalous Hall states, which are generalizations of the fractional quantum Hall states to lattice models with zero net magnetic field and full lattice translation symmetry. Local and translationally invariant Hamiltonians can also be constructed, for which the proposed states are unique ground states. Our result demonstrates that generic chiral topologically ordered states can be realized in lattice models, without requiring magnetic translation symmetry and Landau level structure. We further generalize our approach to fractional topological insulators, and provide the first explicit wave-function description of fractional topological insulators in the absence of spin conservation.

Xiao-Liang Qi

2011-09-15T23:59:59.000Z

429

Subsurface conductive isolation of refraction correlative magnetic signals (SCIRCMS)  

E-Print Network [OSTI]

. This is an independently-derived sequence of anomalous values derived from Global Positioning System (GPS) refracted ranges. Detailed application of the Biot-Savart law provides independent anomaly signals to which the magnetic anomalies correlations show great...

Erck, Eric Stephenson

2004-11-15T23:59:59.000Z

430

Magnetic Moment of Electrons near Cosmic Strings  

E-Print Network [OSTI]

We study the effect of background geometry generated by a thin cosmic string on the anomalous magnetic moment of the electron. We find that the magnitude of the quantum correction to the magnetic moment depends on the distance from the cosmic string as well as on the deficit angle.

Takuya Maki; Kiyoshi Shiraishi

2014-01-27T23:59:59.000Z

431

Studies of Anomalous Ionization Edgar Y. Choueiri  

E-Print Network [OSTI]

Laboratory (EPPDyL) Princeton University, Princeton NJ 08544. Hideo Okuda Princeton Plasma Physics LabStudies of Anomalous Ionization Edgar Y. Choueiri Electric Propulsion and Plasma Dynamics., Princeton University Princeton, NJ. 08544 AIAA Paper: AIAA-94-2465 Abstract In order to improve the accuracy

Choueiri, Edgar

432

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

433

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

434

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

435

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

436

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

437

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

438

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

439

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

440

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

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

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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 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

442

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

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

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

443

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

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

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

444

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

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

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

445

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

446

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

447

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

448

Towards a compensatable Muon Collider calorimeter with manageable backgrounds  

SciTech Connect (OSTI)

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

449

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

450

Novel Muon Beam Facilities for Project X at Fermilab  

SciTech Connect (OSTI)

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

451

FFAG LATTICE FOR MUON ACCELERATION WITH DISTRIBUTED RF.  

SciTech Connect (OSTI)

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

452

Nonlinear Simulations of Peeling-Ballooning Modes with Anomalous Electron Viscosity and their Role in Edge Localized Mode Crashes  

SciTech Connect (OSTI)

A minimum set of equations based on the peeling-ballooning (P-B) model with nonideal physics effects (diamagnetic drift, ExB drift, resistivity, and anomalous electron viscosity) is found to simulate pedestal collapse when using the new BOUT++ simulation code, developed in part from the original fluid edge code BOUT. Nonlinear simulations of P-B modes demonstrate that the P-B modes trigger magnetic reconnection, which leads to the pedestal collapse. With the addition of a model of the anomalous electron viscosity under the assumption that the electron viscosity is comparable to the anomalous electron thermal diffusivity, it is found from simulations using a realistic high-Lundquist number that the pedestal collapse is limited to the edge region and the edge localized mode (ELM) size is about 5%-10% of the pedestal stored energy. This is consistent with many observations of large ELMs.

Xu, X. Q.; Umansky, M. V. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Dudson, B.; Wilson, H. [University of York, Heslington, York YO10 5DD (United Kingdom); Snyder, P. B. [General Atomics, San Diego, California 92186 (United States)

2010-10-22T23:59:59.000Z

453

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…

454

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

455

First direct observation of muon antineutrino disappearance  

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

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

456

Anomalous Topological Pumps and Fractional Josephson Effects  

E-Print Network [OSTI]

We discover novel topological pumps in the Josephson effects for superconductors. The phase difference, which is odd under the chiral symmetry defined by the product of time-reversal and particle-hole symmetries, acts as an anomalous adiabatic parameter. These pumping cycles are different from those in the "periodic table", and are characterized by $Z\\times Z$ or $Z_2\\times Z_2$ strong invariants. We determine the general classifications in class AIII, and those in class DIII with a single anomalous parameter. For the $Z_2\\times Z_2$ topological pump in class DIII, one $Z_2$ invariant describes the coincidence of fermion parity and spin pumps whereas the other one reflects the non-Abelian statistics of Majorana Kramers pairs, leading to three distinct fractional Josephson effects.

Fan Zhang; C. L. Kane

2013-10-20T23:59:59.000Z

457

Melvin Schwartz and the Discovery of the Muon Neutrino  

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

458

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

459

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

460

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

462

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

463

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

464

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

465

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

466

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

467

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

468

Fermilab Muon Ring Arrives to a Large Crowd of Fans  

SciTech Connect (OSTI)

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

469

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

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

470

(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

471

Probing anomalous gauge boson couplings at LEP  

SciTech Connect (OSTI)

We bound anomalous gauge boson couplings using LEP data for the Z {yields} {bar {integral}}{integral} partial widths. We use an effective field theory formalism to compute the one-loop corrections resulting from non-standard model three and four gauge boson vertices. We find that measurements at LEP constrain the three gauge boson couplings at a level comparable to that obtainable at LEPII.

Dawson, S. [Brookhaven National Lab., Upton, NY (United States); Valencia, G. [Iowa State Univ., Ames, IA (United States). Dept. of Physics

1994-12-31T23:59:59.000Z

472

Anomalous Doppler effects in phononic band gaps  

Science Journals Connector (OSTI)

Doppler effects in periodic acoustic media were studied theoretically and experimentally. Analytical formulas are derived using the Green’s function formalism. We found that a far field observer cannot hear the sound inside a band gap from a stationary source, but a moving source can be heard even if the frequency is inside the gap, and the Doppler shifts can be inverted or anomalously large.

Xinhua Hu; Zhihong Hang; Jensen Li; Jian Zi; C. T. Chan

2006-01-30T23:59:59.000Z

473

Muon Production in Relativistic Cosmic-Ray Interactions  

SciTech Connect (OSTI)

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

474

Accelerator Preparations for Muon Physics Experiments at Fermilab  

SciTech Connect (OSTI)

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

475

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

476

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

477

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

478

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

479

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…

480

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

Note: This page contains sample records for the topic "muon anomalous magnetic" 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

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

482

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

483

Future Accelerators, Muon Colliders, and Neutrino Factories  

SciTech Connect (OSTI)

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

484

Anomalous Light Absorption by Small Particles  

E-Print Network [OSTI]

A new type of resonant light absorption by a small particle (nanocluster) is reported. The problem cannot be described within the commonly used dipole scattering approximation and should be studied with methods based upon the exact Mie solution. It is shown that the absorption cross-section has giant maxima realized at small values of the imaginary part of the complex dielectric permittivity of the particle. The maxima are situated in the vicinity of the plasmon (polariton) resonances and correspond to the regions where the dissipative damping equals the radiative one. The case is similar to the recently introduced anomalous scattering [PRL vol. 97, 263902 (2006)] and exhibits similar peculiarities.

Michael I. Tribelsky

2009-12-18T23:59:59.000Z

485

Anomalous Hysteresis in Perovskite Solar Cells  

Science Journals Connector (OSTI)

Anomalous Hysteresis in Perovskite Solar Cells ... Even for silicon solar cells, hysteresis in the current-voltage curves can occur if the bias is swept extremely fast, with complete scans performed in less than 2 to 44 ms depending on the precise cell architecture. ... We will discuss the three predominant perovskite solar-cell architectures in this letter: (i) planar heterojunction solar cells with no mesoporous oxide,(7, 17) (ii) perovskite-sensitized solar cells fabricated on mesoporous TiO2,(1, 3) and (iii) meso-superstrutured solar cells (MSSCs) which employ mesoporous Al2O3 as an inert scaffold in place of the TiO2. ...

Henry J. Snaith; Antonio Abate; James M. Ball; Giles E. Eperon; Tomas Leijtens; Nakita K. Noel; Samuel D. Stranks; Jacob Tse-Wei Wang; Konrad Wojciechowski; Wei Zhang

2014-03-24T23:59:59.000Z

486

Fermi surfaces and anomalous transport in quasicrystals  

Science Journals Connector (OSTI)

Electronic transport properties of quasicrystals are discussed theoretically. By means of ab initio linear muffin tin orbitals calculations, electronic band structure and corresponding Fermi surfaces of several quasicrystalline approximants are obtained. A criterion for distinguishing between metallic and anomalous transport properties in intermetallics is proposed. Unconventional temperature dependence of conductivity of quasicrystals and approximants is addressed in a second part. It is shown that power law exponents can be directly deduced from scaling analysis of the Kubo formula. Finally in relation to our results, we briefly summarize actual knowledge on low temperature transport regimes.

S. Roche and T. Fujiwara

1998-11-01T23:59:59.000Z

487

Magnetic moment versus tensor charge  

E-Print Network [OSTI]

We express the baryon magnetic moments in terms of the baryon tensor charges, considering the quarks as relativistic interacting objects. Once tensor charges get measured accurately, the formula for the baryon magnetic moment will serve to extract precise information on the quark anomalous magnetic moment, the quark effective mass and the ratio of the quark constituent mass to the quark effective mass. The analogous formula for the baryon electric dipole moment is of no great use as it gets eventually sizable contributions from various CP- violating sources not necessary associated to the quark electric dipole moment.

M. Mekhfi

2005-05-10T23:59:59.000Z

488

The Magnetism of Neutron States  

E-Print Network [OSTI]

The recent measurement by Bignami and co-workers of the magnetic field of a neutron star for the first time gives a value that differs by about two orders of magnitude from the expected value. The speculation has been that the nuclear matter in the neutron stars exhibits some exotic behaviour. In this note we argue that this exotic behaviour is an anomalous statistics obeyed by the neutrons, and moreover these considerations lead to a value of the magnetic field that agrees with the observation. The same considerations also correctly give the magnetic fields of the earth and Jupiter.

B. G. Sidharth

2003-10-01T23:59:59.000Z

489

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

490

Anomalous radio emission from dust in the Helix  

E-Print Network [OSTI]

A byproduct of experiments designed to map the CMB is the recent detection of a new component of foreground Galactic emission. The anomalous foreground at ~ 10--30 GHz, unexplained by traditional emission mechanisms, correlates with 100um dust emission. We report that in the Helix the emission at 31 GHz and 100um are well correlated, and exhibit similar features on sky images, which are absent in H\\beta. Upper limits on the 250 GHz continuum emission in the Helix rule out cold grains as candidates for the 31 GHz emission, and provide spectroscopic evidence for an excess at 31 GHz over bremsstrahlung. We estimate that the 100um-correlated radio emission, presumably due to dust, accounts for at least 20% of the 31 GHz emission in the Helix. This result strengthens previous tentative interpretations of diffuse ISM spectra involving a new dust emission mechanism at radio frequencies. Very small grains have not been detected in the Helix, which hampers interpreting the new component in terms of spinning dust. The observed iron depletion in the Helix favors considering the identity of this new component to be magnetic dipole emission from hot ferromagnetic grains. The reduced level of free-free continuum we report also implies an electronic temperature of Te=4600\\pm1200K for the free-free emitting material, which is significantly lower than the temperature of 9500\\pm500K inferred from collisionally-excited lines (abridged).

S. Casassus; A. C. S. Readhead; T. J. Pearson; L. -A. Nyman; M. C. Shepherd; L. Bronfman

2003-12-01T23:59:59.000Z

491

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

492

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

493

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

494

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

495

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

496

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

497

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

498

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

499

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

500

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

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