Microscopic Calculations of Weak Interaction Rates of Nuclei in Stellar Environment for A = 18 to 100
J. -U. Nabi, H. V. Klapdor-Kleingrothaus
Abstract
We report here the microscopic calculation of weak interaction rates in stellar matter for 709 nuclei with A = 18 to 100 using a generalized form of proton-neutron quasiparticle RPA model with separable Gamow-Teller forces. This is the first ever extensive microscopic calculation of weak rates calculated over a wide temperature-density grid which includes 107 ≤ T(K) ≤ 30 × 109 and 10 ≤ ρYe (gcm-3) ≤ 1011, and over a larger mass range. Particle emission processes from excited states, previously ignored, are taken into account, and are found to significantly affect some β decay rates. The calculated capture and decay rates take into consideration the latest experimental energy levels and ft value compilations. Our calculation of electron capture and β-decay rates, in the fp-shell, show considerable differences with a recently reported shell model diagonalization approach calculation.
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