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Nuclear Experiment

arXiv:1111.2849 (nucl-ex)
[Submitted on 11 Nov 2011 (v1), last revised 26 Mar 2012 (this version, v2)]

Title:Influence of entrance-channel magicity and isospin on quasi-fission

Authors:Cédric Simenel (DNP, SPhN), D. J. Hinde (DNP), R. Du Rietz (DNP), M. Dasgupta (DNP), M. Evers (DNP), C. J. Lin (DNP), D. H. Luong (DNP), A. Wakhle (DNP)
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Abstract:The role of spherical quantum shells in the competition between fusion and quasi-fission is studied for reactions forming heavy elements. Measurements of fission fragment mass distributions for different reactions leading to similar compound nuclei have been made near the fusion barrier. In general, more quasi-fission is observed for reactions with non-magic nuclei. However, the $^{40}$Ca+$^{208}$Pb reaction is an exception, showing strong evidence for quasi-fission, though both nuclei are doubly magic. Time-dependent Hartree-Fock calculations predict fast equilibration of $N/Z$ in the two fragments early in the collision. This transfer of nucleons breaks the shell effect, causing this reaction to behave more like a non-magic one in the competition between fusion and quasi-fission. Future measurements of fission in reactions with exotic beams should be able to test this idea with larger $N/Z$ asymmetries.
Comments: accepted for publication in Physics Letters B
Subjects: Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
Cite as: arXiv:1111.2849 [nucl-ex]
  (or arXiv:1111.2849v2 [nucl-ex] for this version)
  https://doi.org/10.48550/arXiv.1111.2849
Journal reference: Physics Letters B 710 (2012) 607
Related DOI: https://doi.org/10.1016/j.physletb.2012.03.063

Submission history

From: Cedric Simenel [view email] [via CCSD proxy]
[v1] Fri, 11 Nov 2011 20:42:55 UTC (2,086 KB)
[v2] Mon, 26 Mar 2012 07:29:58 UTC (253 KB)
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