Programme

P.33 -- Poster, VCTP-46

Date: Tuesday, 5 October 2021

Time: 08:30 - 10:00

Examination of α-induced fusion reactions relevant to the production of p-nuclei

N. Nhu Le (1), N. Ngoc Duy (2), N. Quang Hung (3), (4)

(1) Faculty of Physics, University of Education, Hue University, 34 Le Loi, Hue City 530000, Vietnam (2) Department of Physics, Sungkyunkwan University, Suwon 16419, South Korea (3) Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam (4) Faculty of Natural Sciences, Duy Tan University, Danang City 550000, Vietnam

The present paper examines the effect of temper ature-dependent repulsive core potential on the fusion reac- tions of the α particle relevant to the production of p-nuclei such as 154 Sm, 162 Dy, 166 Er, and 197 Au. For this purpose, the α-nucleus potentials making use of the double folding model with the density-dependent CDM3Y3 interaction plus the temperature-dependent repulsion (CDM3Y3+Repulsion) are employed. In addition, three nuclear level density (NLD) models of Fermi-Gas (FG), Hartree–Fock BCS (HFBCS), and exact pairing plus independent-particle model (EP+IPM) are used to describe the temperature-dependent excitation energy of the compound nucleus produced in the fusion reac- tion. The results obtained show that temperature has a signifi- cant effect on the repulsive core potential, and different NLD models predict different fusion potentials, especially at high temperatures and near the center point (origin) of the interac- tion. Going further away from the origin, the repulsive core potential decreases to approximately zero near the barrier region, while at sufficiently far distances, it is least affected by nuclear temperature. The calculated fusion cross sections using the CDM3Y3+Repulsion potential are only affected by the diffuseness parameter of the repulsive potential arep. in the region above the Coulomb barrier, and a good agree- ment with the experimental data is found at arep. = 0.35 fm. Hence, the effect of repulsive potential on the α-induced reac- tions is only justified as a correction term, which is added to resolve the Pauli principle problem. This conclusion is in line with those reported previously using similar formalism but for other fusion reactions of heavy nuclei.

Presenter: Nguyen Nhu Le