First-forbidden transitions and stellar ?-decay rates of Zn and Ge isotopes
Küçük Resim Yok
Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Iop Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
First-forbidden (FF) charge-changing transitions become relatively important for nuclei as their proton number increases. This is because the strength of allowed Gamow-Teller (GT) transitions decreases with increasing Z. The FF transitions play an important role in reducing the half-lives compared to those calculated from taking the GT transitions alone into account. In this paper we calculate allowed GT as well as 0(+) -> 0(-) and 0(+) -> 2(-) transitions for neutron-rich Zn and Ge isotopes. Two different pn-QRPA models were used with a schematic separable interaction to calculate GT and FF transitions. Half-lives calculated after inclusion of FF transitions were in excellent agreement with the experimental data. Our calculations were also compared to previous QRPA calculations and were found to be in better agreement with measured data. Stellar beta-decay rates were calculated for these nuclei including allowed GT and unique FF transitions for astrophysical applications. Ge-86,Ge-88 has a sizeable contribution to the total stellar rate from unique FF transitions.
Açıklama
21st Nuclear Physics Workshop on Marie and Pierre Curie -- SEP 23-28, 2014 -- Kazimierz Dolny, POLAND
Anahtar Kelimeler
first forbidden beta decay rates, QRPA theory, r-process nucleosynthesis
Kaynak
Physica Scripta
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
90
Sayı
11
