We compute electron-capture rates for Fe-54,Fe-56 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 J(pi) = 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.
Stellar electron-capture rates on nuclei based on a microscopic Skyrme functional / A.F. Fantina, E. Khan, G. Colò, N. Paar, D. Vretenar. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 86:3(2012), pp. 035805.1-035805.9. [10.1103/PhysRevC.86.035805]
Stellar electron-capture rates on nuclei based on a microscopic Skyrme functional
G. Colò;
2012
Abstract
We compute electron-capture rates for Fe-54,Fe-56 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 J(pi) = 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.File | Dimensione | Formato | |
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