Experimental Validation of the Largest Calculated Isospin-Symmetry-Breaking Effect in a Superallowed Fermi Decay
Nuclear Experiment
2015-05-30 v2 Nuclear Theory
Abstract
A precision measurement of the gamma yields following the beta decay of 32Cl has determined its isobaric analogue branch to be (22.47^{+0.21}_{-0.19})%. Since it is an almost pure Fermi decay, we can also determine the amount of isospin-symmetry breaking in this superallowed transition. We find a very large value, delta_C=5.3(9)%, in agreement with a shell-model calculation. This result sets a benchmark for isospin-symmetry-breaking calculations and lends support for similarly-calculated, yet smaller, corrections that are currently applied to 0+ -> 0+ transitions for tests of the Standard Model.
Keywords
Cite
@article{arxiv.1108.5312,
title = {Experimental Validation of the Largest Calculated Isospin-Symmetry-Breaking Effect in a Superallowed Fermi Decay},
author = {D. Melconian and S. Triambak and C. Bordeanu and A. García and J. C. Hardy and V. E. Iacob and N. Nica and H. I. Park and G. Tabacaru and L. Trache and I. S. Towner and R. E. Tribble and Y. Zhai},
journal= {arXiv preprint arXiv:1108.5312},
year = {2015}
}