Mesonic enhancement of the weak axial charge and its effect on the half-lives and spectral shapes of first-forbidden J+↔J− decays
Abstract
The effects of the enhancement of the axial-charge matrix element γ5 were studied in medium heavy
and heavy nuclei for first-forbidden J+ ↔ J− decay transitions using the nuclear shell model. Noticeable
dependence on the enhancement MEC of the axial-charge matrix element, as well as on the value of the
axial-vector coupling constant gA was found in the spectral shapes of 93Y, 95Sr, and 97Y. The importance
of the spectrum of 138Cs in the determination of gA is discussed. Half-life analyses in the A ≈ 95 and
A ≈ 135 regions were done, and consistent results gA ≈ 0.90, 0.75, and 0.65, corresponding to the three
enhancement scenarios MEC = 1.4, 1.7, and 2.0, were obtained. Connection to the reactor-antineutrino
anomaly is pointed out.
Main Authors
Format
Articles
Research article
Published
2018
Series
Subjects
Publication in research information system
Publisher
Elsevier B.V.
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-201805072485Use this for linking
Review status
Peer reviewed
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2018.02.053
Language
English
Published in
Physics Letters B
Citation
- Kostensalo, J., & Suhonen, J. (2018). Mesonic enhancement of the weak axial charge and its effect on the half-lives and spectral shapes of first-forbidden J+↔J− decays. Physics Letters B, 781, 480-484. https://doi.org/10.1016/j.physletb.2018.02.053
License
Copyright© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.