Beta-decay coupling constants

1965 ◽  
Vol 36 (2) ◽  
pp. 523-532 ◽  
Author(s):  
Y. S. Kim
Keyword(s):  
Beta Decay ◽  
Coupling Constants

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.

THE ELECTRON ASYMMETRY IN THE BETA DECAY OF POLARIZED NEUTRONS

1961 ◽  
Vol 39 (1) ◽  
pp. 13-21 ◽  
Author(s):  
M. A. Clark ◽  
J. M. Robson
Keyword(s):  
Angular Correlation ◽  
Beta Decay ◽  
Axial Vector ◽  
Coupling Constants ◽  
Neutron Spin ◽  
Neutron Decay ◽  
Vector Coupling ◽  
Polarized Neutrons ◽  
Spin Direction

The coefficient of the angular correlation between the electron direction and the neutron spin direction in the beta decay of the neutron has been measured using a beam of polarized neutrons. The coefficient of this correlation is −0.09 ± 0.05. This implies that CA/CV, the ratio of the axial vector to vector coupling constants in neutron decay, is equal to −1.20 ± 0.12.

Mesonic Corrections to the Beta-Decay Coupling Constants

1954 ◽  
Vol 95 (6) ◽  
pp. 1695-1697 ◽  
Author(s):  
R. J. Finkelstein ◽  
S. A. Moszkowski
Keyword(s):  
Beta Decay ◽  
Coupling Constants

Vibrational and thermal averaging of the indirect nuclear spin-spin coupling constants of CH4, SiH4, GeH4 and SnH4

1997 ◽  
Vol 91 (5) ◽  
pp. 897-907 ◽  
Author(s):  
SHEELA KIRPEKAR ◽  
THOMAS ENEVOLDSEN ◽  
JENS ODDERSHEDE ◽  
WILLIAM RAYNES
Keyword(s):  
Nuclear Spin ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

$\mathit{Ab\!-\!initio}$ Determination of Magnetic Interface Coupling Constants for Magnetic Multilayers

1997 ◽  
Vol 7 (11) ◽  
pp. 1299-1304 ◽  
Author(s):  
P. Weinberger ◽  
C. Sommers ◽  
U. Pustogowa ◽  
L. Szunyogh ◽  
B. Újfalussy
Keyword(s):  
Ab Initio ◽  
Magnetic Multilayers ◽  
Coupling Constants ◽  
Interface Coupling
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