The cross section calculation of 112Sn(α,γ)116Te reaction with different nuclear models at the astrophysical energy range

Abstract

The theoretical cross section calculations for the astrophysical p process are needed because the most of the related reactions are technically very difficult to be measured in the laboratory. Even if the reaction was measured, most of the measured reactions have been carried out at the higher energy range from the astrophysical energies. Therefore, almost all cross sections needed for p process simulation has to be theoretically calculated or extrapolated to the astrophysical energies. The 112 Sn(α,γ) 116 Te is an important reaction for the p process nucleosynthesis. The theoretical cross section of the 112 Sn(α,γ) 116 Te reaction was investigated for different global optical model potentials, level density and strength function models at the astrophysically interested energies. Astrophysical S factors were calculated and compared with experimental data available in EXFOR database. The calculation with the optical model potential of the dispersive model by Demetriou et al., and Back-shifted Fermi gas level density model and Brink-Axel Lorentzian strength function model best served to reproduce experimental results at astrophysically relevant energy region. The reaction rates were calculated with these model parameters at the p process temperature and compared with the current version of the reaction rate library Reaclib and Starlib.

Calculation of microscopic nuclear level densities based on covariant density functional theory

“…Nuclear level density (NLD) is the basic physics input for nuclear reactions. It is the key ingredient for the calculation of reaction cross sections relevant for nucleosynthesis [1][2][3][4][5][6]. The study of NLDs can date back to 1930's with Bethe's pioneering work [7].…”