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Stellar electron-capture rates on nuclei based on a microscopic Skyrme functional
F. Fantina A., Khan E., Colò G., Paar N., Vretenar D.
Physical Review C 86 (2012) 035805 - http://hal.in2p3.fr/in2p3-00744447
Physique/Astrophysique/Astrophysique stellaire et solaire
Planète et Univers/Astrophysique/Astrophysique stellaire et solaire
Physique/Physique Nucléaire Théorique
Stellar electron-capture rates on nuclei based on a microscopic Skyrme functional
A. F. Fantina, E. Khan1, G. Colò, N. Paar, D. Vretenar
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
We compute electron-capture rates for 54,56Fe and Ge isotopes using a self-consistent microscopic approach. The single-nucleon basis and the occupation factors in the target nucleus are calculated in the finite-temperature Skyrme Hartree-Fock model, and the Jπ=0±, 1±, 2± charge-exchange transitions are determined in the finite-temperature random-phase approximation (RPA). The scheme is self-consistent; i.e., both the Hartree-Fock and the RPA equations are based on the same Skyrme functional. Several interactions are used in order to provide a theoretical uncertainty on the electron-capture rates for different astrophysical conditions. Comparing electron-capture rates obtained either with different Skyrme sets or with different available models indicates that differences up to one to two orders of magnitude can arise.

Articles dans des revues avec comité de lecture
2012
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)
86
035805