Skip to main content
1–5 Jul 2024
Dubna, Russia
Europe/Moscow timezone

Appearance of the hindrance to complete fusion in heavy-ion collisions

2 Jul 2024, 13:20
20m
Conference Hall (FLNR)

Conference Hall

FLNR

second floor, Chairman: Adamian G.

Speaker

Avazbek Nasirov (Joint Institute for Nuclear Research)

Description

The hindrance to complete fusion is studied as a function of the charge asymmetry of colliding nuclei and orbital angular momentum of the collision. The formation of a dinuclear system (DNS) in the heavy ion collisions is calculated dynamically and its evolution is considered as multinucleon transfer between its fragments. The results prove that a hindrance at formation of a compound nucleus (CN) is related with the quasifission process which is breakup of the DNS into products instead to reach the equilibrated state of the CN. The role of the angular momentum in the charge (mass) distribution evolution for the given mass asymmetry of the colliding nuclei has been demonstrated. The results of this work have been compared with the measured data for the quasifission yields in the 12C+204Pb and 48Ca+168Er reactions to show the dependence of the hindrance on the mass asymmetry of the entrance channel [1]. The new mechanism of the incomplete fusion [2] and the analysis of the mixing of the quasifission yields with the ones of the very asymmetric fusion-fission processes [3] allow us to conclude that complete fusion occurs due to multinucleon transfer through the window (neck) between interacting DNS nuclei. The isotopes 272Ds and 280Ds are formed in the cold 64Ni+208Pb and hot 48Ca+232Th fusion reactions, respectively. In spite of the small fusion probability 105 in the former reaction, the ER cross section is large σER=15 pb due to small excitation energy ECN=12.7 MeV [4] and large fission barrier of 272Ds. Though the hindrance to complete fusion small for the hot 48Ca+232Th fusion reaction, the maximal value 0.7 pb of the ER cross section was observed for the 4n channel [5] since fission barrier is 3.29 MeV for the CN 280Ds.

  1. A.K. Nasirov, E.D. Khusanov, M.M. Nishonov, arXiv:2403.08489v1 [nucl-th], https://doi.org/10.48550/arXiv.2403.08489 (accepted to Phys. Rev. C) (2024).
  2. A.K. Nasirov, B.M. Kayumov, O.K. Ganiev, G.A. Yuldasheva, Phys. Lett. B 842, 137976 (2023).
  3. Shruti, B. R. Behera, N. Saneesh, A. K. Nasirov et al., Eur. Phys. Jour. A 59, 238 (2023).
  4. G. Giardina et al., Eur. Phys.Jour. A 8, 205 (2000).
  5. Yu. Ts. Oganessian et al., Phys. Rev. C 108, 024611 (2023).
Section Experimental and theoretical studies of nuclear reactions

Author

Avazbek Nasirov (Joint Institute for Nuclear Research)

Co-authors

Dr Bahodir Kayumov (New Uzbekistan University) Mr Elzod Khusanov (Institute of Nuclear Physics) Mr Azimboy Yusupov (Institute of Nuclear Physics)

Presentation materials

There are no materials yet.