{ "id": "2501.00796", "version": "v1", "published": "2025-01-01T10:24:41.000Z", "updated": "2025-01-01T10:24:41.000Z", "title": "Stellar Weak Rates and Mass Fractions of 20 Most Important $fp$-shell Nuclei with $A < 65$", "authors": [ "Asim Ullah", "Jameel-Un Nabi" ], "comment": "26 pages, 9 Tables, 2 Figures", "journal": "Brazilian Journal of Physics, 52:13 (2022)", "doi": "10.1007/s13538-021-01024-0", "categories": [ "astro-ph.SR", "nucl-th" ], "abstract": "This work presents stellar weak rates and mass fractions of 20 most important electron capture (ec) and beta decay (bd) nuclei with $A < 65$ according to a recent study during the presupernova evolution of massive stars. The mass fractions of these nuclei were calculated using the Sahas equation which assumes nuclear statistical equilibrium for a set of initial conditions ($T_9$, $\\rho$ and $Y_e$) that represents the trajectory which a massive stars central region takes after its silicon core burns. Our computed mass fractions were found in decent comparison in most cases, and up to a factor 4 difference was noted when compared with the Independent Particle Model results. The weak interaction (ec and bd) rates were calculated in a totally microscopic fashion using the proton neutron quasiparticle random phase ap proximation model and without assuming the Brink Axel hypothesis. The rates were computed for a wide range of density ($10$-$10^{11}$) g/cm$^3$ and temperature (0.01-30) GK. In comparison with large scale shell model, our computed rates were found bigger at high values of core temperature. The current study may contribute in a more realistic simu lation of stellar evolution processes and modeling of core collapse supernovae.", "revisions": [ { "version": "v1", "updated": "2025-01-01T10:24:41.000Z" } ], "analyses": { "keywords": [ "stellar weak rates", "mass fractions", "shell nuclei", "random phase ap proximation", "phase ap proximation model" ], "tags": [ "journal article" ], "publication": { "publisher": "Springer" }, "note": { "typesetting": "TeX", "pages": 26, "language": "en", "license": "arXiv", "status": "editable" } } }