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
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
(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.
PACS
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
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