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Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments by Dzhioev, Alan A.; Vdovin, A. I.; Ponomarev, V. Yu.; Wambach, J.; Langanke, K.; Martínez-Pinedo, G. is a scholarly article available to read on EtoBox.

What is Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments about?

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.

Author

Dzhioev, Alan A.; Vdovin, A. I.; Ponomarev, V. Yu.; Wambach, J.; Langanke, K.; Martínez-Pinedo, G.

Published

2009

Language

EN