Validity of Brink Axel Hypothesis for calculations of allowed stellar weak rates of heavy nuclei

Abstract

The knowledge of beta decay transitional probabilities and GamowTeller (GT) strength functions from highly excited states of nuclides is of particular importance for applications to astrophysical network calculations of nucleosynthesis in explosive stellar events. These quantities are challenging to achieve from measurements or computations using various nuclear models. Due to unavailability of feasible alternatives, many theoretical studies often rely on the Brink Axel (BA) hypothesis, that is, the response of strength functions depends merely on the transition energy of the parent nuclear ground state and is independent of the underlying details of the parent state, for the calculation of stellar rates. BA hypothesis has been used in many applications from nuclear structure determination to nucleosynthesis yield in the astrophysical matter.

29 Pages, 8Figures 5 Tables

References in corpus (7)

• Stellar electron-capture rates calculated with the finite-temperature relativistic random-phase approximation
• Nuclear level densities and gamma-ray strength functions in 44,45Sc
• Modification of the Brink-Axel Hypothesis for High Temperature Nuclear Weak Interactions
• Unblocking of stellar electron capture for neutron-rich $N=50$ nuclei at finite temperature
• Weak-interaction mediated rates on iron isotopes for presupernova evolution of massive stars
• Gamow-Teller transitions from 24Mg and its impact on the electron capture rates in the O + Ne + Mg cores of stars
• Nickel isotopes in stellar matter

Cited by in corpus (1)

• Impact of the Brink Axel Hypothesis on Unique First Forbidden \b{eta} transitions for r process nuclei