Investigation of Gamow Teller Transition Properties in 56-64Ni Isotopes Using QRPA Methods

Abstract

Weak rates in nickel isotopes play an integral role in the dynamics of supernovae. Electron capture and $\beta$-decay of nickel isotopes, dictated by Gamow-Teller transitions, significantly alter the lepton fraction of the stellar matter. In this paper we calculate Gamow-Teller (GT) transitions for isotopes of nickel, ${}^{56-64}$Ni, using QRPA methods. The GT strength distributions were calculated using four different QRPA models. Our results are also compared with previous theoretical calculations and measured strength distributions wherever available. Our investigation concluded that amongst all RPA models, the pn-QRPA(C) model best described the measured GT distributions (including total GT strength and centroid placement). It is hoped that the current investigation of GT properties would prove handy and may lead to a better understanding of the presupernova evolution of massive stars.

arXiv comment33 Pages, 12 Figures, 7 Tables

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Cited by in corpus (3)

• Impact of complex many-body correlations on electron capture in thermally excited nuclei around ${}^{78}$Ni
• Competition of deformation and neutron-proton pairing in Gamow-Teller transitions for ${}^{56,58}$Ni and ${}^{62,64}$Ni
• Neutrino cooling rates due to nickel isotopes for presupernova evolution of massive stars