Microscopic calculations of weak interaction rates of nuclei in stellar environment for A = 18 to 100
J.-U. Nabi - H.V. Klapdor-Kleingrothaus
Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
Received: 16 April 1999 Communicated by B. Povh
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 (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 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 -decay rates, in the fp-shell, show considerable differences with a recently reported shell model diagonalization approach calculation.
23.40.-s decay; double decay; electron and muon capture - 23.40.Bw Weak-interaction and lepton (including neutrino) aspects - 21.60.Jz Hartree-Fock and random-phase approximations