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Title: Deformed shell effects in Ca 48 + Bk 249 quasifission fragments

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: 48Ca + 249Bk collisions are studied with the time-dependent Hartree-Fock approach for a range of angular momenta and orientations. Results: Unlike similar reactions with a 238U target, no significant shell effects which could be attributed to the 208Pb “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.

Authors:
 [1]; ORCiD logo [1];  [2]
  1. Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy
  2. Australian National Univ., Canberra, ACT (Australia). Research School of Physics and Engineering, Dept. of Theoretical Physics and Dept. of Nuclear Physics
Publication Date:
Research Org.:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1558011
Alternate Identifier(s):
OSTI ID: 1556832
Grant/Contract Number:  
SC0013847
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Godbey, K., Umar, A. S., and Simenel, C. Deformed shell effects in Ca48+Bk249 quasifission fragments. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.024610.
Godbey, K., Umar, A. S., & Simenel, C. Deformed shell effects in Ca48+Bk249 quasifission fragments. United States. doi:10.1103/PhysRevC.100.024610.
Godbey, K., Umar, A. S., and Simenel, C. Mon . "Deformed shell effects in Ca48+Bk249 quasifission fragments". United States. doi:10.1103/PhysRevC.100.024610.
@article{osti_1558011,
title = {Deformed shell effects in Ca48+Bk249 quasifission fragments},
author = {Godbey, K. and Umar, A. S. and Simenel, C.},
abstractNote = {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: 48Ca + 249Bk collisions are studied with the time-dependent Hartree-Fock approach for a range of angular momenta and orientations. Results: Unlike similar reactions with a 238U target, no significant shell effects which could be attributed to the 208Pb “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.},
doi = {10.1103/PhysRevC.100.024610},
journal = {Physical Review C},
number = 2,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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