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arXiv 1304.2155nucl-thastro-ph.SR
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准粒子无规相位近似计算PF壳层核中恒星电子俘获率

Stellar electron-capture rates in pf-shell nuclei from quasiparticle random-phase approximation calculations

P. Sarriguren

摘要:

在不同的密度和温度条件下的电子捕获率进行了评估的一组PF壳核代表的成分在前超新星形成。该问题的原子核结构部分描述在一个准粒子随机相位近似的基础上变形Skyrme Hartree-Fock自洽平均场与配对相关和剩余相互作用的粒子-空穴和粒子-粒子通道。的伽莫夫-泰勒强度的能量分布进行评估和比较基准壳模型计算和实验数据提取的电荷交换反应。讨论了弱速率的模型依赖性,并分析了密度和温度的各种敏感性。

英文摘要:

Electron-capture rates at different density and temperature conditions are evaluated for a set of pf-shell nuclei representative of the constituents in presupernova formations. The nuclear structure part of the problem is described within a quasiparticle random-phase approximation based on a deformed Skyrme Hartree-Fock selfconsistent mean field with pairing correlations and residual interactions in particle-hole and particle-particle channels. The energy distributions of the Gamow-Teller strength are evaluated and compared to benchmark shell-model calculations and experimental data extracted from charge-exchange reactions. The model dependence of the weak rates are discussed and the various sensitivities to both density and temperature are analyzed.

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