Liu, W.
; Wang, Y.
; Guo, B.
; Tang, X.
; Zeng, S.
(Ed.)
β − decay lifetimes are essential ingredients for r -process yield calculations. In N≈126 r -process waiting point nuclei first-forbidden and allowed β decays are expected to compete. Recent experiments performed at CERN/ISOLDE showed that 207,208 Hg decay predominantly via first-forbidden decays. In addition, following on a high statistics study of the β + / EC decay of 208 At, it is suggested that the Z>82, N<126 nuclei provide an excellent testing ground for global calculations addressing the competition between first-forbidden and allowed β decays.
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