EPJ Web Conf.
Volume 260, 2022The 16th International Symposium on Nuclei in the Cosmos (NIC-XVI)
|Number of page(s)||8|
|Published online||24 February 2022|
Description of weak-interaction rates within the relativistic energy density functional theory
1 Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
2 Physics Department, Faculty of Science and Letters, Yildiz Technical University, TR-34220, Esenler/Istanbul, Turkey
3 School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
4 Dipartimento di Fisica, Università degli Studi di Milano, Milano, Italy and INFN, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
5 Institut de Physique Nuclèaire, Universitè Paris-Sud, IN2P3-CNRS, Universitè Paris-Saclay, F-91406 Orsay Cedex, France
* e-mail: firstname.lastname@example.org
Published online: 24 February 2022
A new theoretical framework has been established and applied in the calculation of electron capture (EC) and β-decay rates in stellar environment, characterized by high density and temperature. For the description of the nuclear properties, the finite-temperature Hartree Bardeen-Cooper-Schrie_er (FTHBCS) theory based on the relativistic derivative-coupling D3C* interaction is employed. In order to describe the charge-exchange transitions, the finitetemperature proton-neutron quasi-particle random-phase approximation is developed (FT-PNRQRPA) which includes both temperature and pairing correlations. In the FT-HBCS calculations, only the isovector pairing is included, while in the residual interaction of the FT-PNRQRPA both the isovector and isoscalar pairing contribute. In this work, results for EC and β-decay rates are presented in the temperature interval T = 0–1.5 MeV and stellar density ρYe = 107 and 109 g/cm3. Both allowed 0+, 1+ and first-forbidden transitions 0−, 1− and 2− are included in the calculations. It is shown that interplay between pairing correlations and finite-temperature effects can lead to significant changes in rates. It is also important to include de-excitations, i.e. transitions with negative Q-value, that become increasingly significant at higher temperatures especially for p f -shell nuclei.
© The Authors, published by EDP Sciences, 2022
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