arXiv:nucl-ex/0608032·v1·Nuclear Experiment
Branching ratios for the beta decay of 21Na
V.E. Iacob🇺🇸 · J.C. Hardy🇺🇸 · C.A. Gagliardi🇺🇸 · J. Goodwin🇺🇸 · N. Nica🇺🇸 · H.I. Park🇺🇸 · G. Tabacaru🇺🇸 · L. Trache🇺🇸 · R. Tribble🇺🇸 · Y. Zhai🇺🇸 · I.S. Towner (Texas A&M)🇺🇸
Abstract
We have measured the beta-decay branching ratio for the transition from 21Na to the first excited state of 21Ne. A recently published test of the standard model, which was based on a measurement of the beta-nu correlation in the decay of 21Na, depended on this branching ratio. However, until now only relatively imprecise (and, in some cases, contradictory) values existed for it. Our new result, 4.74(4)%, reduces but does not remove the reported discrepancy with the standard model.
Comments: Revtex4, 2 figs