Tuesday, April 9, 2013

1304.2155 (P. Sarriguren)

Stellar electron-capture rates in pf-shell nuclei from quasiparticle
random-phase approximation calculations

P. Sarriguren
Electron-capture rates at different density and temperature conditions are evaluated for a set of pf-shell nuclei representative of the constituents in presupernova formations. The nuclear structure part of the problem is described within a quasiparticle random-phase approximation based on a deformed Skyrme Hartree-Fock selfconsistent mean field with pairing correlations and residual interactions in particle-hole and particle-particle channels. The energy distributions of the Gamow-Teller strength are evaluated and compared to benchmark shell-model calculations and experimental data extracted from charge-exchange reactions. The model dependence of the weak rates are discussed and the various sensitivities to both density and temperature are analyzed.
View original: http://arxiv.org/abs/1304.2155

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