Naslov
Stellar electron-capture rates on nuclei based on a microscopic Skyrme functional

Autori
Fantina, A.F ; Khan, Elias ; Colo, Gianluca ; Paar, Nils ; Vretenar, Dario

Izvornik
Physical review C (0556-2813) 86 (2012), 3; 035805-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
stellar elecetron capture rates; skyrme energy density functional; random phase approximation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA