Pairing correlations within the micro-macroscopic approach for the level density
| Pub type: | Article |
| Citation: | Magner2024 |
| Status: | Published |
| Journal: | The European Physical Journal A |
| Volume: | 60 |
| Number: | 1 |
| Year: | 2024 |
| Month: | Jan |
| Pages: | 6 |
| ISSN: | 1434-601X |
| URL: | https://doi.org/10.1140/epja/s... |
| DOI: | 10.1140/epja/s10050-023-01222-1 |
| Abstract: | Level density {\$}{\$}{\backslash}rho (E,N,Z){\$}{\$}is calculated for the two-component close- and open-shell nuclei with a given energy E, and neutron N and proton Z numbers, taking into account pairing effects within the microscopic-macroscopic approach (MMA). These analytical calculations have been carried out by using semiclassical statistical mean-field approximations beyond the saddle-point method of the Fermi gas model in a low excitation-energies range. The level density {\$}{\$}{\backslash}rho {\$}{\$}, obtained as function of the system entropy S, depends essentially on the condensation energy {\$}{\$}E{\_}{\{}{\backslash}textrm{\{}cond{\}}{\}}{\$}{\$}through the excitation energy U in super-fluid nuclei.The simplest super-fluid approach, based on the BCS theory, accounts for a smooth temperature dependence of the pairing gap {\$}{\$}{\backslash}Delta {\$}{\$}due to particle number fluctuations. Taking into account the pairing effects in magic or semi-magic nuclei, excited below neutron resonances, one finds a notable pairing phase transition. Pairing correlations sometimes improve significantly the comparison with experimental data. |
| Month_val: | 1 |
| Userfields: | day={08}, |
| Sig contrib: | S. Shlomo |
| Authors: | |
| Added by: | [DGM] |
| Total mark: | 0 |
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