$\beta $-decay properties of some astrophysically important Sc isotopes

Autor: Fakeha Farooq, Ramoona Shehzadi, Jameel-Un Nabi
Rok vydání: 2021
Předmět:
Zdroj: Astrophysics and Space Science. 366
ISSN: 1572-946X
0004-640X
DOI: 10.1007/s10509-021-03990-y
Popis: In late progressive-stages of heavy stars, electron capture and $\beta^{\pm}$ -decay are the governing processes. The weak rates are essential inputs for the modeling of the stages of high-mass stars before supernova explosions. As per results obtained from previous simulations, weak rates of scandium isotopes contribute substantially in changing the lepton-to-baryon ratio ( $\text{Y}_{e}$ ) of the nuclear matter of core. In the present analysis, we have reported some important $\beta $ -decay properties of crucial Sc isotopes in an astrophysical environment having $49 \le \text{A}\le 54$ . The investigation includes GT-strength distributions, terrestrial half-lives and stellar rates of electron capture (EC) and $\beta^{-}$ -decay reactions. The calculations are performed in a microscopic way by using the proton–neutron (pn) quasi-particle random phase approximation (QRPA) model over a wide temperature $(10^{7}\text{--}3\times10^{10})~\text{K}$ and density $(10\text{--}10^{11})~\text{g/cm}^{3}$ domains. In addition, a comparison of our calculated results have been done with experimental and theoretical data, where available. Good agreement between our half-lives calculations and experimentally measured results is observed. Our calculated weak $\beta^{-}$ -decay and EC rates have been compared with earlier computed rates of Independent-Particle Model (IPM) and Large-Scale Shell Model (LSSM). At high stellar temperature and density conditions, our calculated rates of $\beta^{-}$ -decay are smaller than those from the other models. The decrement in our rates approaches up to 1–3 orders of magnitude. In contrast, our EC rates are larger at high temperature by up to 1–2 orders of magnitude.
Databáze: OpenAIRE
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