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Gamow-Teller excitations at finite temperature: Competition between pairing and temperature effects

机译：有限温度的Gamow-Teller激动：配对和温度效应之间的竞争

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摘要

The relativistic and nonrelativistic finite temperature proton-neutron quasiparticle random phase approximation (FT-PNQRPA) methods are developed to study the interplay of the pairing and temperature effects on the Gamow-Teller excitations in open-shell nuclei, as well as to explore the model dependence of the results by using two rather different frameworks for effective nuclear interactions. The Skyrme-type functional SkM* is employed in the nonrelativistic framework, while the density-dependent meson-exchange interaction DD-ME2 is implemented in the relativistic approach. Both the isoscalar and isovector pairing interactions are taken into account within the FT-PNQRPA. Model calculations show that below the critical temperatures the Gamow-Teller excitations display a sensitivity to both the finite temperature and pairing effects, and this demonstrates the necessity for implementing both in the theoretical framework. The established FT-PNQRPA opens perspectives for the future complete and consistent description of astrophysically relevant weak interaction processes in nuclei at finite temperature such as beta decays, electron capture, and neutrino-nucleus reactions.
机译：开发了相对论和非椭圆的有限温度质子中子Quasipartics Quasiparticle Qualipartics Qualiparticle Qualiparticle Qualiparticle Qualiparticle近似（FT-PNQRPA）方法，以研究配对和温度效应对开壳核中的Gamow-Teller激发的相互作用，以及探索模型结果通过使用两个相当不同的框架进行有效核相互作用的依赖性。 Skyrme型功能SKM *在非椭圆形框架中采用，而依赖于密度的Meson-Exchange交互DD-ME2以相对论的方法实现。在FT-PNQRPA内考虑ISOSCALAR和IsoVector配对相互作用。模型计算显示，Gamow-Teller激励的临界温度低于有限温度和配对效果的敏感性，这证明了在理论框架中实施的必要性。已建立的FT-PNQRPA为未来的核心和一致地描述核，例如β衰减，电子捕获和中性细胞核反应的有限温度的天体物理相关弱相互作用过程的透视。

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