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arXiv 1402.0793astro-ph.HEnucl-exnucl-th
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选定$A=20$和$A=24$核的天体物理弱相互作用率

Astrophysical weak-interaction rates for selected $A=20$ and $A=24$ nuclei

G. Martínez-Pinedo, Y. H. Lam, K. Langanke, R. G. T. Zegers, C. Sullivan

摘要:

我们计算了$M=8$-12 M $_\odot$在与恒星演化后期有关的温度和密度条件下,$^{20}$ Ne,$^{20}$ F,$^{24}$ Mg,$^{24}$ Na的电子俘获率以及$^{20}$ F和$^{24}$ Na的$β$衰变率.速率是基于最近的实验数据和大规模壳模型计算。我们表明,$^{20}$ Ne,$^{24}$ Mg和$^{20}$ F,$^{24}$ Na $β$ -衰减率的电子捕获率是基于在这个天体物理范围内的数据,除了对$^{20}$ Ne,我们预测有一个主要的贡献,从第二禁戒之间的过渡$^{20}$ Ne和$^{20}$ F基态的密度范围$\log ρY_e (\mathrm{g~cm}^{-3}) = 9.3$-9.6的捕获率。少数个别过渡的主导地位,使我们能够在相关的天体物理条件下,通过解析表达式来呈现各种速率。我们还得到了筛选率的校正。

英文摘要:

We have evaluated the electron capture rates on $^{20}$Ne, $^{20}$F, $^{24}$Mg, $^{24}$Na and the $β$ decay rates for $^{20}$F and $^{24}$Na at temperature and density conditions relevant for the late-evolution stages of stars with $M=8$-12 M$_\odot$. The rates are based on recent experimental data and large-scale shell model calculations. We show that the electron capture rates on $^{20}$Ne, $^{24}$Mg and the $^{20}$F, $^{24}$Na $β$-decay rates are based on data in this astrophysical range, except for the capture rate on $^{20}$Ne, which we predict to have a dominating contribution from the second-forbidden transition between the $^{20}$Ne and $^{20}$F ground states in the density range $\log ρY_e (\mathrm{g~cm}^{-3}) = 9.3$-9.6. The dominance of a few individual transitions allows us to present the various rates by analytical expressions at the relevant astrophysical conditions. We also derive the screening corrections to the rates.

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