Stellar weak interaction rates and shape coexistence for 68Se and 72Kr waiting points

Abstract

Beyond-mean-field results on stellar beta-decay and continuum electron capture rates for the rp-process waiting point nuclei 68Se and 72Kr at densities ρYe = 104−107 mol/cm3 and temperatures T = 108−1010 K are presented. The structure of the even-even parent and odd-odd daughter nuclei dominated by shape coexistence and mixing is self-consistently described within the complex Excited Vampir model using realistic effective interactions in rather large model spaces. The influence of the shape mixing in the structure of the low-lying parent states as well as in the independently calculated daughter states on the stellar weak interaction rates is discussed.