Deformed shell effects in Ca48+Bk249 quasifission fragments

K. Godbey, A. S. Umar, and C. Simenel
Phys. Rev. C 100, 024610 – Published 12 August 2019

Abstract

Background: Quasifission is the main reaction channel hindering the formation of superheavy nuclei (SHN). Its understanding will help to optimize entrance channels for SHN studies. Quasifission also provides a probe to understand the influence of shell effects in the formation of the fragments.

Purpose: Investigate the role of shell effects in quasifission and their interplay with the orientation of the deformed target in the entrance channel.

Methods: Ca48+Bk249 collisions are studied with the time-dependent Hartree-Fock approach for a range of angular momenta and orientations.

Results: Unlike similar reactions with a U238 target, no significant shell effects which could be attributed to the Pb208 “doubly magic” nucleus are found. However, the octupole deformed shell gap at N=56 seems to strongly influence quasifission in the most-central collisions.

Conclusions: Shell effects similar to those observed in fission affect the formation of quasifission fragments. Mass-angle correlations could be used to experimentally isolate the fragments influenced by N=56 octupole shell gaps.

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  • Received 18 June 2019

DOI:https://doi.org/10.1103/PhysRevC.100.024610

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

K. Godbey* and A. S. Umar

  • Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA

C. Simenel

  • Department of Theoretical Physics and Department of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia

  • *kyle.s.godbey@vanderbilt.edu
  • umar@compsci.cas.vanderbilt.edu
  • cedric.simenel@anu.edu.au

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Issue

Vol. 100, Iss. 2 — August 2019

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