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arXiv 1012.2543nucl-th
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恒星环境中中微子-核非弹性散射的热效应

Thermal effects on neutrino-nucleus inelastic scattering in stellar environments

Alan A. Dzhioev, A. I. Vdovin, V. Yu. Ponomarev, J. Wambach

摘要:

研究了铁区偶偶核对中微子-核非弹性散射的热效应。准粒子随机相位近似内,扩展到有限的温度内的热场动力学形式主义的截面的允许和第一禁止的贡献计算。计算了样品核$^{54}$ Fe在有限温度下的GT $_0$强度分布。计算了超新星核心坍缩过程中中性流中微子-核非弹性截面。激发态的热布居显著增强了低中微子能量下的截面。与使用大尺度壳模型方法的研究一致,增强主要是由于在有限温度下的中微子上散射。

英文摘要:

Thermal effects for inelastic neutrino-nucleus scattering off even-even nuclei in the iron region are studied. Allowed and first-forbidden contributions to the cross sections are calculated within the quasiparticle random phase approximation, extended to finite temperatures within the Thermo-Field-Dynamics formalism. The GT$_0$ strength distribution at finite temperatures is calculated for the sample nucleus $^{54}$Fe. The neutral-current neutrino-nucleus inelastic cross section is calculated for relevant temperatures during the supernova core collapse. The thermal population of the excited states significantly enhances the cross section at low neutrino energies. In agreement with studies using a large scale shell-model approach the enhancement is mainly due to neutrino up-scattering at finite temperatures.

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