scholarly journals Determination of the Weak Axial Vector Couplingλ=gA/gVfrom a Measurement of theβ-Asymmetry ParameterAin Neutron Beta Decay

2013 ◽  
Vol 110 (17) ◽  
Author(s):  
D. Mund ◽  
B. Märkisch ◽  
M. Deissenroth ◽  
J. Krempel ◽  
M. Schumann ◽  
...  
Keyword(s):  
Beta Decay ◽  
Axial Vector ◽  
Neutron Beta Decay

scholarly journals Undetected electron backscattering in Perkeo III

2019 ◽  
Vol 219 ◽  
pp. 04005 ◽  
Author(s):  
Christoph Roick ◽  
Heiko Saul ◽  
Hartmut Abele ◽  
Bastian Märkisch
Keyword(s):  
Systematic Error ◽  
Beta Decay ◽  
Systematic Uncertainty ◽  
Electron Spectroscopy ◽  
Axial Vector ◽  
Vector Coupling ◽  
Neutron Beta Decay ◽  
Axial Vector Coupling ◽  
Electron Detection

The beta asymmetry in neutron beta decay is used to determine the ratio of axial-vector coupling to vector coupling most precisely. In electron spectroscopy, backscattering of electrons from detectors can be a major source of systematic error. We present the determination of the correction for undetected backscattering for electron detection with the instrument Perkeo III. For the electron asymmetry, undetected backscattering leads to a fractional correction of 5 × 10−4, i.e. a change by 40% of the total systematic uncertainty.

The mathematical modeling of the experiment on the determination of correlation coefficients in neutron beta-decay

2018 ◽  
Author(s):  
A. P. Serebrov ◽  
O. M. Zherebtsov ◽  
G. N. Klyushnikov
Keyword(s):  
Mathematical Modeling ◽  
Beta Decay ◽  
Correlation Coefficients ◽  
Neutron Beta Decay

scholarly journals Neutron beta decay and the current determination of Vud

2001 ◽  
Vol 500 (1-2) ◽  
pp. 66-74 ◽  
Author(s):  
A. Garcı́a ◽  
J.L. Garcı́a-Luna ◽  
G. López Castro
Keyword(s):  
Beta Decay ◽  
Neutron Beta Decay

scholarly journals The Nab experiment: A precision measurement of unpolarized neutron beta decay

2019 ◽  
Vol 219 ◽  
pp. 04002 ◽  
Author(s):  
J. Fry ◽  
R. Alarcon ◽  
S. Baeßler ◽  
S. Balascuta ◽  
L. Barrón Palos ◽  
...  
Keyword(s):  
Beta Decay ◽  
Nuclear Physics ◽  
Axial Vector ◽  
Electron Neutrino ◽  
Coupling Constants ◽  
Neutron Lifetime ◽  
Large Area ◽  
Vector Coupling ◽  
Oak Ridge ◽  
Neutron Beta Decay

Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, λ = gA/gV, through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameter a with a precision of δa/a = 10−3 and the Fierz interference term b to δb = 3 × 10−3 in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio λ with a precision of δλ/λ = 0.03% that will allow an evaluation of Vud and sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects.

Beta-decay of polarized Λ hyperons II. Determination of the vector and axial vector form factors

1971 ◽  
Vol 37 (5) ◽  
pp. 535-537 ◽  
Author(s):  
K.H. Althoff ◽  
R.M. Brown ◽  
D. Freytag ◽  
K.S. Heard ◽  
J. Heintze ◽  
...  
Keyword(s):  
Beta Decay ◽  
Axial Vector ◽  
Form Factors ◽  
Vector Form

scholarly journals Corrections of order O(Ee2∕mN2), caused by weak magnetism and proton recoil, to the neutron lifetime and correlation coefficients of the neutron beta decay

2021 ◽  
pp. 103806
Author(s):  
A.N. Ivanov ◽  
R. Höllwieser ◽  
N.I. Troitskaya ◽  
M. Wellenzohn ◽  
Ya.A. Berdnikov
Keyword(s):  
Beta Decay ◽  
Correlation Coefficients ◽  
Neutron Lifetime ◽  
Neutron Beta Decay ◽  
Weak Magnetism ◽  
Proton Recoil
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