Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-12-14
AIP Conf.Proc.381:129-140,1999
Physics
Nuclear Physics
Nuclear Theory
12 pages, LaTeX with aipproc2.sty (included) and epsf.sty; Invited talk at Nuclear Structure 98, Gatlinburg, Tennessee, Aug. 1
Scientific paper
10.1063/1.59543
Superallowed $0^+ \to 0^+$ nuclear beta decay provides a direct measure of the weak vector coupling constant, $\GV$. We survey current world data on the nine accurately determined transitions of this type, which range from the decay of $^{10}$C to that of $^{54}$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, $\delta_C$, 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.
Hardy J. C.
Towner Ian S.
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