Deformed shell effects in Ca48+Bk249 quasifission fragments

Godbey, K.; Umar, A. S.; Simenel, C.

doi:10.1103/PhysRevC.100.024610

Title: Deformed shell effects in ${}^{48}{Ca} + {}^{249}{Bk}$ 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:

Godbey, K. ^[1];

^[1]; Simenel, C. ^[2]

Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy
Australian National Univ., Canberra, ACT (Australia). Research School of Physics and Engineering, Dept. of Theoretical Physics and Dept. of Nuclear Physics

Publication Date:: 2019-08-12

Research Org.:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

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.

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                    Godbey, K., Umar, A. S., & Simenel, C. Deformed shell effects in Ca48+Bk249 quasifission fragments.  United States.  https://doi.org/10.1103/PhysRevC.100.024610

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                    Godbey, K., Umar, A. S., and Simenel, C. Mon .  
"Deformed shell effects in Ca48+Bk249 quasifission fragments".  United States.  https://doi.org/10.1103/PhysRevC.100.024610.  https://www.osti.gov/servlets/purl/1558011.

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@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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FIG. 1: Schematic representation of the initial configuration for an impact parameter b and a velocity vector v_∞ defining the collision plane and the collision axis. The orientation of the target is defined by the angles β (rotation around the axis perpendicular to the reaction plane) and α (rotation aroundmore »

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Works referencing / citing this record:

New procedure to determine the mass-angle correlation of quasifission
journal, December 2019

Schmitt, C.; Mazurek, K.; Nadtochy, P. N.
Physical Review C, Vol. 100, Issue 6
DOI: 10.1103/physrevc.100.064606

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Title: Deformed shell effects in ${}^{48}{Ca} + {}^{249}{Bk}$ quasifission fragments

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journal, January 2018

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journal, November 2014

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journal, May 2015

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journal, April 2001

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journal, May 2019

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journal, April 2012

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journal, January 2018

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journal, March 1983

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journal, May 2019

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journal, August 2008

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journal, April 2018

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journal, February 2018

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journal, November 2013

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journal, August 2017

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journal, March 1996

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journal, January 1999

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journal, November 2012

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journal, January 2013

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journal, May 2014

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journal, June 2007

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journal, December 1978

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journal, April 1996

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journal, March 2019

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journal, May 2011

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journal, April 2019

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journal, October 2017

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journal, October 2010

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