Using the thermal quasiparticle random-phase approximation, we study the process of neutrino and antineutrino capture on hot nuclei in supernova environments. For the sample nuclei Fe-56 and Ge-82 we perform a detailed analysis of thermal effects on the strength distribution of allowed Gamow-Teller (GT) transitions which dominate low-energy charged-current neutrino reactions. The finite-temperature cross sections are calculated taking into account the contributions of both allowed and forbidden transitions. The enhancement of the low-energy cross sections is explained by considering thermal effects on the GT(+/-) strength. For Fe-56 we compare the calculated finite-temperature cross sections with those obtained from large-scale shell-model calculations.
Neutrino absorption by hot nuclei in supernova environments
Wambach, J.
2015-01-01
Abstract
Using the thermal quasiparticle random-phase approximation, we study the process of neutrino and antineutrino capture on hot nuclei in supernova environments. For the sample nuclei Fe-56 and Ge-82 we perform a detailed analysis of thermal effects on the strength distribution of allowed Gamow-Teller (GT) transitions which dominate low-energy charged-current neutrino reactions. The finite-temperature cross sections are calculated taking into account the contributions of both allowed and forbidden transitions. The enhancement of the low-energy cross sections is explained by considering thermal effects on the GT(+/-) strength. For Fe-56 we compare the calculated finite-temperature cross sections with those obtained from large-scale shell-model calculations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.