The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
F. Glück - One of the best experts on this subject based on the ideXlab platform.
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Impact of Neutron Decay Experiments on non-Standard Model Physics
Physics Beyond the Standard Models of Particles Cosmology and Astrophysics, 2011Co-Authors: G Konrad, W Heil, D Pocanic, S. Baeßler, F. GlückAbstract:This paper gives a brief overview of the present and expected future limits on physics beyond the Standard Model (SM) from Neutron beta Decay, which is described by two parameters only within the SM. Since more than two observables are accessible, the problem is over-determined. Thus, precise measurements of correlations in Neutron Decay can be used to study the SM as well to search for evidence of possible extensions to it. Of particular interest in this context are the search for right-handed currents or for scalar and tensor interactions. Precision measurements of Neutron Decay observables address important open questions of particle physics and cosmology, and are generally complementary to direct searches for new physics beyond the SM in high-energy physics. Free Neutron Decay is therefore a very active field, with a number of new measurements underway worldwide. We present the impact of recent developments.Comment: 13 pages, 6 figures; Proceedings of the 5th International BEYOND 2010 Conference, Cape Town, South Africa (2010), World Scientific, accepted for publication; Corrected typo
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impact of Neutron Decay experiments on non standard model physics
arXiv: Nuclear Experiment, 2010Co-Authors: G Konrad, S Baesler, W Heil, D Pocanic, F. GlückAbstract:This paper gives a brief overview of the present and expected future limits on physics beyond the Standard Model (SM) from Neutron beta Decay, which is described by two parameters only within the SM. Since more than two observables are accessible, the problem is over-determined. Thus, precise measurements of correlations in Neutron Decay can be used to study the SM as well to search for evidence of possible extensions to it. Of particular interest in this context are the search for right-handed currents or for scalar and tensor interactions. Precision measurements of Neutron Decay observables address important open questions of particle physics and cosmology, and are generally complementary to direct searches for new physics beyond the SM in high-energy physics. Free Neutron Decay is therefore a very active field, with a number of new measurements underway worldwide. We present the impact of recent developments.
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Measuring the proton spectrum in Neutron Decay—Latest results with aSPECT
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2009Co-Authors: M. Simson, F. Glück, G Konrad, S. Baeßler, F. Ayala Guardia, M. Borg, W. Heil, I. Konorov, R. Muñoz Horta, K.k.h. LeungAbstract:The retardation spectrometer aSPECT was built to measure the shape of the proton spectrum in free Neutron Decay with high precision. This allows us to determine the antineutrino electron angular correlation coefficient a. We aim for a precision more than one order of magnitude better than the present best value, which is Delta_a /a = 5%. In a recent beam time performed at the Institut Laue-Langevin during April / May 2008 we reached a statistical accuracy of about 2% per 24 hours measurement time. Several systematic effects were investigated experimentally. We expect the total relative uncertainty to be well below 5%.Comment: Accepted for publication in the Conference Proceedings of the International Workshop on Particle Physics with Slow Neutrons 2008 held at the ILL, France. To be published in Nuclear Instruments and Methods in Physics Research, Section
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First measurements with the Neutron Decay spectrometer a SPECT
The European Physical Journal A, 2008Co-Authors: S. Baeßler, F. Glück, G Konrad, F. Ayala Guardia, M. Borg, W. Heil, I. Konorov, R. Muñoz Horta, G. Petzoldt, D. RichAbstract:The Neutron Decay spectrometer a SPECT has been built to perform a precise measurement of the proton spectrum shape in the Decay of free Neutrons. Such a measurement allows a determination of the neutrino electron angular-correlation coefficient a . The present best experiments have an uncertainty of Δ a / a = 5% and since the seventies there is no substantial improvement. With a SPECT, we aim for an uncertainty which is lower by more than an order of magnitude, thus enabling us to perform several precise tests of the Standard Model. In our first beam time at the particle physics beam MEPHISTO at the ForschungsNeutronenquelle Heinz Maier-Leibnitz, we studied the properties of the spectrometer. The most serious problem turned out to be the situation- and time-dependent behavior of the background. From the data sets from this beam time in which a background problem was not obvious, we could extract a value of a = - 0.1151±0.0040^stat , but we could not quantify the background uncertainty. We show ways to deal with the background and other problems for future beam times.
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Measurement of the neutrino asymmetry parameter B in Neutron Decay.
Physical review letters, 2007Co-Authors: Marc Schumann, Bastian Markisch, Torsten Soldner, Marc Deissenroth, F. Glück, J. Krempel, M. Kreuz, D. Mund, A. Petoukhov, Hartmut AbeleAbstract:A new measurement of the neutrino asymmetry parameter B in Neutron Decay, the angular correlation between Neutron spin and antineutrino momentum, is presented. The result, B=0.9802(50), confirms earlier measurements but features considerably smaller corrections. It agrees with the standard model expectation and permits updated tests on "new physics" in Neutron Decay.
S. O. Ifedili - One of the best experts on this subject based on the ideXlab platform.
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SOLAR Neutron Decay INJECTION OF PROTONS INTO THE RADIATION BELT
Solar Physics, 1997Co-Authors: S. O. IfediliAbstract:Solar flare Neutron measurements are used to normalize the results of the calculation of Claflin and White (1970) for injection of protons into the Earth's radiation belt by solar Neutron Decay. Our results indicate that solar Neutron Decay injection of protons from solar flare Neutrons is the major source of protons (E > 30 MeV) at L ≳ 2 in the radiation belt.
Akio Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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Data Assimilation Using Subcritical Measurement of Prompt Neutron Decay Constant
Nuclear Science and Engineering, 2020Co-Authors: Tomohiro Endo, Akio YamamotoAbstract:The prompt Neutron Decay constant α in a steady-state subcritical system can be directly measured using a reactor noise analysis method such as the Feynman- α method. To reduce the nuclear data–ind...
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Sensitivity analysis of prompt Neutron Decay constant using perturbation theory
Journal of Nuclear Science and Technology, 2018Co-Authors: Tomohiro Endo, Akio YamamotoAbstract:ABSTRACTExperimental results of prompt Neutron Decay constant α is useful information to validate numerical results of ω-eigenvalue for spatial and energetic fundamental mode. In order to accomplis...
G Konrad - One of the best experts on this subject based on the ideXlab platform.
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NoMoS: Beyond the Standard Model Physics in Neutron Decay
Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2015), 2016Co-Authors: G KonradAbstract:The newly established New Frontiers Group ’NoMoS: Beyond the Standard Model Physics in Neutron Decay’ of the Austrian Academy of Sciences aims to search for traces of new physics in Neutron beta Decay with novel experimental techniques. The NoMoS group is hosted at the Stefan-Meyer-Institute for Subatomic Physics in Vienna. Precision measurements in Neutron Decay allow searching for physics beyond the Standard Model of particle physics. An accuracy of 10−4 in the observables corresponds to energy scales of 1−100 TeV for new particles and interactions. In order to achieve this accuracy, a new experimental technique is developed: R×B spectroscopy. An R×B spectrometer measures the momentum of charged particles by their drift in a circular magnetic field. This new, accurate method of spectroscopy will be applied to determine several correlation coefficients in Neutron Decay. The construction of the first R×B spectrometer, NoMoS, is part of the New Frontiers Group. For measurements at ultimate statistics, the R×B spectrometer will be installed at PERC, a new facility at the FRM II in Garching/Germany that collects electrons and protons from a large Neutron Decay volume. A final goal is to measure or to set limits on the Fierz interference term. This term is forbidden in the Standard Model and has not yet been measured with Neutrons. A non-zero value would indicate that yet unknown charged Higgs bosons, sleptons, or leptoquarks were exchanged instead of the Standard Model W boson. Besides the physics motivation, the measurement concept and physics programme of NoMoS are presented in this paper.
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Impact of Neutron Decay Experiments on non-Standard Model Physics
Physics Beyond the Standard Models of Particles Cosmology and Astrophysics, 2011Co-Authors: G Konrad, W Heil, D Pocanic, S. Baeßler, F. GlückAbstract:This paper gives a brief overview of the present and expected future limits on physics beyond the Standard Model (SM) from Neutron beta Decay, which is described by two parameters only within the SM. Since more than two observables are accessible, the problem is over-determined. Thus, precise measurements of correlations in Neutron Decay can be used to study the SM as well to search for evidence of possible extensions to it. Of particular interest in this context are the search for right-handed currents or for scalar and tensor interactions. Precision measurements of Neutron Decay observables address important open questions of particle physics and cosmology, and are generally complementary to direct searches for new physics beyond the SM in high-energy physics. Free Neutron Decay is therefore a very active field, with a number of new measurements underway worldwide. We present the impact of recent developments.Comment: 13 pages, 6 figures; Proceedings of the 5th International BEYOND 2010 Conference, Cape Town, South Africa (2010), World Scientific, accepted for publication; Corrected typo
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impact of Neutron Decay experiments on non standard model physics
arXiv: Nuclear Experiment, 2010Co-Authors: G Konrad, S Baesler, W Heil, D Pocanic, F. GlückAbstract:This paper gives a brief overview of the present and expected future limits on physics beyond the Standard Model (SM) from Neutron beta Decay, which is described by two parameters only within the SM. Since more than two observables are accessible, the problem is over-determined. Thus, precise measurements of correlations in Neutron Decay can be used to study the SM as well to search for evidence of possible extensions to it. Of particular interest in this context are the search for right-handed currents or for scalar and tensor interactions. Precision measurements of Neutron Decay observables address important open questions of particle physics and cosmology, and are generally complementary to direct searches for new physics beyond the SM in high-energy physics. Free Neutron Decay is therefore a very active field, with a number of new measurements underway worldwide. We present the impact of recent developments.
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Measuring the proton spectrum in Neutron Decay—Latest results with aSPECT
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2009Co-Authors: M. Simson, F. Glück, G Konrad, S. Baeßler, F. Ayala Guardia, M. Borg, W. Heil, I. Konorov, R. Muñoz Horta, K.k.h. LeungAbstract:The retardation spectrometer aSPECT was built to measure the shape of the proton spectrum in free Neutron Decay with high precision. This allows us to determine the antineutrino electron angular correlation coefficient a. We aim for a precision more than one order of magnitude better than the present best value, which is Delta_a /a = 5%. In a recent beam time performed at the Institut Laue-Langevin during April / May 2008 we reached a statistical accuracy of about 2% per 24 hours measurement time. Several systematic effects were investigated experimentally. We expect the total relative uncertainty to be well below 5%.Comment: Accepted for publication in the Conference Proceedings of the International Workshop on Particle Physics with Slow Neutrons 2008 held at the ILL, France. To be published in Nuclear Instruments and Methods in Physics Research, Section
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First measurements with the Neutron Decay spectrometer a SPECT
The European Physical Journal A, 2008Co-Authors: S. Baeßler, F. Glück, G Konrad, F. Ayala Guardia, M. Borg, W. Heil, I. Konorov, R. Muñoz Horta, G. Petzoldt, D. RichAbstract:The Neutron Decay spectrometer a SPECT has been built to perform a precise measurement of the proton spectrum shape in the Decay of free Neutrons. Such a measurement allows a determination of the neutrino electron angular-correlation coefficient a . The present best experiments have an uncertainty of Δ a / a = 5% and since the seventies there is no substantial improvement. With a SPECT, we aim for an uncertainty which is lower by more than an order of magnitude, thus enabling us to perform several precise tests of the Standard Model. In our first beam time at the particle physics beam MEPHISTO at the ForschungsNeutronenquelle Heinz Maier-Leibnitz, we studied the properties of the spectrometer. The most serious problem turned out to be the situation- and time-dependent behavior of the background. From the data sets from this beam time in which a background problem was not obvious, we could extract a value of a = - 0.1151±0.0040^stat , but we could not quantify the background uncertainty. We show ways to deal with the background and other problems for future beam times.
J. A. Winger - One of the best experts on this subject based on the ideXlab platform.
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Study of the beta -delayed Neutron Decay of 18N.
Physical review. C Nuclear physics, 1994Co-Authors: K. W. Scheller, D. J. Morrissey, B. M. Sherrill, Joachim Görres, J. G. Ross, Michael Wiescher, R. Harkewicz, M. Steiner, N. A. Orr, J. A. WingerAbstract:The \ensuremath{\beta}-delayed Neutron Decay of $^{18}\mathrm{N}$ has been studied using a time-of-flight array with high efficiency. The $^{18}\mathrm{N}$ ions were produced by fragmentation of a E/A=75 MeV $^{22}\mathrm{Ne}$ beam. Transitions to nine Neutron unbound states have been observed with a total branching ratio of 2.2\ifmmode\pm\else\textpm\fi{}0.4%. The results are compared with measurements of the Decay to \ensuremath{\gamma}- and \ensuremath{\alpha}-emitting states and the differences between the present results and a recent measurement of the ${\mathit{P}}_{\mathit{n}}$ value are discussed.
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Neutron Decay of 10Li produced by fragmentation.
Physical review. C Nuclear physics, 1993Co-Authors: R. A. Kryger, Aaron Galonsky, Michael Thoennessen, A. Azhari, J. H. Kelley, R. Pfaff, E. Ramakrishnan, D. Sackett, B. M. Sherrill, J. A. WingerAbstract:The Neutron Decay of [sup 10]Li, produced in the reaction of 80 MeV/nucleon [sup 18]O + [sup nat]C, was studied by the coincidence detection of Neutrons and [sup 9]Li nuclei in a collinear geometry. An analysis of the relative velocity spectrum indicates the presence of a [sup 10]Li state which Decays by very low energy Neutron emission. This state corresponds to either the ground state of [sup 10]Li, in which case it is probably an [ital s]-wave resonance, or an excited state at [ital E][sub [ital x]][approx]2.5 MeV.