Eur. Phys. J. A (2015) 51: 133
https://doi.org/10.1140/epja/i2015-15133-9

Regular Article - Theoretical Physics

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

National Institute for Physics and Nuclear Engineering, R-077125, Bucharest, Romania

^* e-mail: spetro@nipne.ro

Received: 27 April 2015
Revised: 6 October 2015
Accepted: 7 October 2015
Published online: 28 October 2015

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 ρY _e = 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.