Gamow-Teller excitations at finite temperature: Competition between pairing and temperature effects
| Autor: | Yüksel, E., Paar, N., Colò, G., Khan, E., Niu, Y. F. |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 101, 044305 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.101.044305 |
| Popis: | 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. Comment: 15 pages, 6 figures, published in Physical Review C |
| Databáze: | arXiv |
| Externí odkaz: |
|