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Microscopic calculations of weak interaction rates of nuclei in stellar environment for A = 18 to 100

  • J.-U. Nabi
  • H.V. Klapdor-Kleingrothaus
Interdisciplinary topics

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 ≤ρ Ye (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.

PACS: 23.40.-s β decay; double β 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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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • J.-U. Nabi
    • 1
  • H.V. Klapdor-Kleingrothaus
    • 1
  1. 1.Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, GermanyDE

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