Investigation of the 121 Sb(α,γ) 125 I reaction cross-section calculations at astrophysical energies

Proton-rich nuclei are synthesized via photodisintegration and reverse reactions. To examine this mechanism and reproduce the observed p-nucleus abundances, it is crucial to know the reaction rates and thereby the reaction cross sections of many isotopes. Given that the number of experiments on the reactions in astrophysical energy regions is very rare, the reaction cross sections are determined by theoretical methods whose accuracy should be tested. In this study, given that ^121 Sb is a stable seed isotope located in the region of medium-mass p-nuclei, we investigated the cross sections and reaction rates of the ^121 Sb( α , γ ) ^125 I reaction using the TALYS computer code with 432 different combinations of input parameters (OMP, LDM, and SFM). The optimal model combinations were determined using the threshold logic unit method. The theoretical reaction cross-sectional results were compared with the experimental results reported in the literature. The reaction rates were determined using the two input parameter sets most compatible with the measurements, and they were compared with the reaction rate databases: STARLIB and REACLIB.