New ${}^{63}$Ga(p,$\gamma$)${}^{64}$Ge and ${}^{64}$Ge(p,$\gamma$)${}^{65}$As reaction rates corresponding to the temperature regime of thermonuclear X-ray bursts

Abstract

We compute the ${}^{63}$Ga(p,$\gamma$)${}^{64}$Ge and ${}^{64}$Ge(p,$\gamma$)${}^{65}$As thermonuclear reaction rates using the latest experimental input supplemented with theoretical nuclear spectroscopic information. The experimental input consists of the latest proton thresholds of ${}^{64}$Ge and ${}^{65}$As, and the nuclear spectroscopic information of ${}^{65}$As, whereas the theoretical nuclear spectroscopic information for ${}^{64}$Ge and ${}^{65}$As are deduced from the full pf-shell space configuration-interaction shell-model calculations with the GXPF1A Hamiltonian. Both thermonuclear reaction rates are determined with known uncertainties at the energies that correspond to the Gamow windows of the temperature regime relevant to Type I X-ray bursts, covering the typical temperature range of the thermonuclear runaway of the GS 1826$-$24 periodic bursts and SAX J1808.4$-$3658 photospheric radius expansion bursts.

Comments: Accepted by Physical Review C on 7 Nov 2024 with minor correction, finalized version, 40 pages, 7 main figures (colorblind-friendly colors), 8 tables, data availability: https://doi.org/10.5281/zenodo.13901500