Neutrino energy loss rates and positron capture rates on ${}^{55}$Co for presupernova and supernova physics

Abstract

Proton-neutron quasi-particle random phase approximation (pn-QRPA) theory has recently being used for calculation of stellar weak interaction rates of $fp$-shell nuclide with success. Neutrino losses from proto-neutron stars play a pivotal role to decide if these stars would be crushed into black holes or explode as supernovae. The product of abundance and positron capture rates on ${}^{55}$Co is substantial and as such can play a role in fine tuning of input parameters of simulation codes specially in the presupernova evolution. Recently we introduced our calculation of capture rates on ${}^{55}$Co, in a luxurious model space of $7\hslash \omega$, employing the pn-QRPA theory with a separable interaction. Simulators, however, may require these rates on a fine scale. Here we present for the first time an expanded calculation of the neutrino energy loss rates and positron capture rates on ${}^{55}$Co on an extensive temperature-density scale. These type of scale is appropriate for interpolation purposes and of greater utility for simulation codes. The pn-QRPA calculated neutrino energy loss rates are enhanced roughly up to two orders of magnitude compared with the large-scale shell model calculations and favor a lower entropy for the core of massive stars.

27 pages, 6 figures, 5 tables

References in corpus (3)

• Comparative study of Gamow-Teller strength distributions in the odd-odd nucleus 50V and its impact on electron capture rates in astrophysical environments
• Gamow-Teller transitions from 24Mg and its impact on the electron capture rates in the O + Ne + Mg cores of stars
• Uncertainties in the $0\nu \beta \beta$--decay nuclear matrix elements

Cited by in corpus (12)

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• Stellar ${\beta }^{\pm }$ decay rates of iron isotopes and its implications in astrophysics
• Stellar neutrino energy loss rates due to ${}^{24}$Mg suitable for O+Ne+Mg core simulations
• Study of Gamow-Teller transitions in isotopes of titanium within the quasi particle random phase approximation
• Nuclear structure and weak rates of heavy waiting point nuclei under rp-process conditions
• Neutrino and antineutrino energy loss rates in massive stars due to isotopes of titanium
• $\beta$-decay of key titanium isotopes in stellar environment
• Lepton capture rates due to isotopes of vanadium in astrophysical environment
• $\beta$-decay properties of some astrophysically important Sc-isotopes
• Lepton emission rates of 43-64V isotopes under stellar conditions