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Title: Superallowed fermi beta decay and Coulomb mixing in nuclei

Abstract

Superallowed 0{sup +}{yields}0{sup +} nuclear beta decay provides a direct measure of the weak vector coupling constant, G{sub v}. We survey current world data on the nine accurately determined transitions of this type, which range from the decay of {sup 10}C to that of {sup 54}Co, and demonstrate that the results confirm conservation of the weak vector current (CVC) but differ at the 98% confidence level from the unitarity condition for the Cabibbo-Kobayashi-Maskawa (CKM) matrix. We examine the reliability of the small calculated corrections that have been applied to the data, and conclude that there are no evident defects although the Coulomb correction, {delta}{sub C}, depends sensitively on nuclear structure and thus needs to be constrained independently. The potential importance of a result in disagreement with unitarity, clearly indicates the need for further work to confirm or deny the discrepancy. We examine the options and recommend priorities for new experiments and improved calculations. Some of the required experiments depend upon the availability of intense radioactive beams. Others are possible with existing facilities. (c) 1999 American Institute of Physics.

Authors:
 [1];  [2]
  1. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
  2. Physics Department, Queen's University, Kingston, Ontario K7L 3N6, (Canada)
Publication Date:
OSTI Identifier:
20216635
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 481; Journal Issue: 1; Other Information: PBD: 2 Sep 1999; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CARBON 10; COBALT 54; FERMI INTERACTIONS; BETA DECAY; KOBAYASHI-MASKAWA MATRIX; FT VALUE; OXYGEN 14; VANADIUM 46; THEORETICAL DATA

Citation Formats

Hardy, J. C., and Towner, I. S. Superallowed fermi beta decay and Coulomb mixing in nuclei. United States: N. p., 1999. Web. doi:10.1063/1.59543.
Hardy, J. C., & Towner, I. S. Superallowed fermi beta decay and Coulomb mixing in nuclei. United States. doi:10.1063/1.59543.
Hardy, J. C., and Towner, I. S. Thu . "Superallowed fermi beta decay and Coulomb mixing in nuclei". United States. doi:10.1063/1.59543.
@article{osti_20216635,
title = {Superallowed fermi beta decay and Coulomb mixing in nuclei},
author = {Hardy, J. C. and Towner, I. S.},
abstractNote = {Superallowed 0{sup +}{yields}0{sup +} nuclear beta decay provides a direct measure of the weak vector coupling constant, G{sub v}. We survey current world data on the nine accurately determined transitions of this type, which range from the decay of {sup 10}C to that of {sup 54}Co, and demonstrate that the results confirm conservation of the weak vector current (CVC) but differ at the 98% confidence level from the unitarity condition for the Cabibbo-Kobayashi-Maskawa (CKM) matrix. We examine the reliability of the small calculated corrections that have been applied to the data, and conclude that there are no evident defects although the Coulomb correction, {delta}{sub C}, depends sensitively on nuclear structure and thus needs to be constrained independently. The potential importance of a result in disagreement with unitarity, clearly indicates the need for further work to confirm or deny the discrepancy. We examine the options and recommend priorities for new experiments and improved calculations. Some of the required experiments depend upon the availability of intense radioactive beams. Others are possible with existing facilities. (c) 1999 American Institute of Physics.},
doi = {10.1063/1.59543},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 481,
place = {United States},
year = {1999},
month = {9}
}