ИСТИНА

R-process is a nucleosynthesis mechanism that poses a great interest to modern nuclear physics as it is regarded to be the main source of heavy isotopes in the Universe. Taking place at extreme temperatures and stellar medium densities, r-process is believed to occur in such astrophysical scenarios as supernova blast or compact objects (neutron starts and black holes) collisions. With the help of the SkyNet library [1] we have implemented a numeric model of the r-process at the temperature of 1.2 GK to study the impact of nuclear mass model choice on the neutron-reach terbium isotopes yields [2]. Mass model is a crucial parameter for astrophysical computations as it defines reaction thresholds and energy levels densities. It is impossible to evaluate these values experimentally for most of nuclei, taking part in mechanisms of explosive nucleosynthesis. In this research we used different mass models, such as the macro-microscopic models FRDM [3] and WS4 [4], the Skyrme interaction-based HFB mass model [5], and the new mass evaluation based on local mass relations [6], to complete astrophysical neutron capture rate libraries that were subsequently used in r-process simulation. To accomplish these calculations we have used the TALYS package [7]. Results of r-process calculation with different mass models were compared to each other in the interval of A = 60 - 220 to get an idea of r-process model sensitivity to nuclear mass model choice. References [1] Lippuner J., Roberts L.F. ApJS. 2017. 1. 233. [2] Negrebetskiy V.V., Stopani K.A. Moscow Univ. Phys. Bull. 2021. 76. 22. [3] Möller P., Nix J.R. et al. ADNDT. 1995. 59. 185. [4] Goriely S., Chamel N., Pearson J.M. Phys. Rev. Lett. 2017. 102. 152503. [5] Na-Na Ma, Hai-Fei Zhang et al. 2019 Chinese Phys. C. 2019. 43. 044105. [6] Vladimirova E.V., Simonov M.V., Tretyakova T.Yu. Proceedings of AYSS-2020, Dubna, Russia, 9-13 Nov. 2020 (in print) [7] Koning A.J., Rochman D. et al. Nucl. D. Sheets. 2019. 1. 155.