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• W3100127565 abstract "Electron capture on $^{20}$Ne is critically important for the final stage of evolution of stars with the initial masses of 8 - 10 $M_{odot}$. In the present paper, we evaluate electron capture rates for a forbidden transition $^{20}$Ne (0$_{g.s.}^{+}$) $rightarrow$ $^{20}$F (2$_{g.s.}^{+}$) in stellar environments by the multipole expansion method with the use of shell-model Hamiltonians. These rates have not been accurately determined in theory as well as in experiments. Our newly evaluated rates are compared with those obtained by a prescription that treats the transition as an allowed Gamow-Teller (GT) transition with the strength determined from a recent $beta$-decay experiment for $^{20}$F (2$_{g.s.}^{+}$) $rightarrow$ $^{20}$Ne (0$_{g.s.}^{+}$) citep{Kirsebom}. We find that different electron energy dependence of the transition strengths between the two methods leads to sizable differences in the weak rates of the two methods. We also find that the Coulomb effects, that is, the effects of screening on ions and electrons are non-negligible. We apply our e-capture rates on $^{20}$Ne to the calculation of the evolution of high-density O-Ne-Mg cores of 8 - 10 $M_{odot}$ stars. We find that our new rates affect the abundance distribution and the central density at the final stage of evolution." @default.
• W3100127565 created "2020-11-23" @default.
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• W3100127565 date "2019-08-13" @default.
• W3100127565 modified "2023-10-14" @default.
• W3100127565 title "Electron-capture Rates in ²⁰Ne for a Forbidden Transition to the Ground State of ²⁰F Relevant to the Final Evolution of High-density O–Ne–Mg Cores" @default.
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• W3100127565 doi "https://doi.org/10.3847/1538-4357/ab2b93" @default.
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