Bogoliubov Laboratory of Theoretical Physics

Seminar on Nuclear Theory

Date and Time: Monday, 5 December 2022, at 3:30 PM

Venue: Blokhintsev lecture hall, Bogoliubov Laboratory of Theoretical Physics, online on Zoom

Information about seminar and link to join

Seminar topic: “Exploration of the quasifission, complete, and incomplete fusion mechanisms in heavy ion collisions around the Coulomb barrier energies”

Speaker: A. K. Nasirov

Authors: A. K. Nasirov¹, B. M. Kayumov², O. K. Ganiev ², G. A. Yuldasheva<sup>2

1</sup> – BLTP, JINR
² – Institute of Nuclear Physics, Tashkent, Uzbekistan

Abstract:

Theoretical description of the evaporation residues cross sections, complete and incomplete fusion cross sections and mass (charge) distributions of the binary reaction products allows us to reveal the role of the entrance channel in the competition of the different reaction channels. The large difference in the formation of the evaporation residues of the 2n and 3n channels of the ³⁴S+²⁰⁸Pb and ³⁶S+²⁰⁶Pb reactions has been explained by the difference in the intrinsic fusion barriers related by the potential energy surfaces calculated for these reactions. The new mechanism of the incomplete fusion has been revealed at the description of the measured cross sections of the evaporation residues formed in the complete and incomplete fusion channels of the ¹⁸O+⁹³Nb and ³²S+¹⁵⁴Sm reactions. The incomplete fusion mechanism has been explained as a very asymmetric quasifission of the dinuclear system which forming at the capture of the projectile nucleus by the target nucleus. Due to the use of the incomplete fusion mechanism we have managed to describe yield of the evaporation residues accompanied by alpha-particle at larger values of the excitation energy where the corresponding results of the statistical models strongly decrease.