Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

Details Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

2009-11-02

arxiv.org/abs/0911.0303v1

Phys.Rev.C81:015804,2010

Physics

Nuclear Physics

Nuclear Theory

16 pages, 9 figures

Scientific paper

10.1103/PhysRevC.81.015804

We propose a new method to calculate stellar weak-interaction rates. It is based on the Thermo-Field-Dynamics formalism and allows the calculation of the weak-interaction response of nuclei at finite temperatures. The thermal evolution of the GT$_+$ distributions is presented for the sample nuclei $^{54, 56}$Fe and ~$^{76,78,80}$Ge. For Ge we also calculate the strength distribution of first-forbidden transitions. We show that thermal effects shift the GT$_+$ centroid to lower excitation energies and make possible negative- and low-energy transitions. In our model we demonstrate that the unblocking effect for GT$_+$ transitions in neutron-rich nuclei is sensitive to increasing temperature. The results are used to calculate electron capture rates and are compared to those obtained from the shell model.

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