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

C. Simenel; D. J. Hinde; R. du Rietz; M. Dasgupta; M. Evers; C. J. Lin; D. H. Luong; A. Wakhle

doi:10.1016/j.physletb.2012.03.063

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

C. Simenel^*, D. J. Hinde, R. du Rietz, M. Dasgupta, M. Evers, C. J. Lin, D. H. Luong, A. Wakhle

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

112 Citations (Scopus)

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 ⁴⁰Ca+ ²⁰⁸Pb 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.

Original language	English
Pages (from-to)	607-611
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	710
Issue number	4-5
DOIs	https://doi.org/10.1016/j.physletb.2012.03.063
Publication status	Published - 20 Apr 2012

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title = "Influence of entrance-channel magicity and isospin on quasi-fission",

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 40Ca+ 208Pb 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.",

keywords = "Heavy-element formation, Nuclear fusion, Quasi-fission, Time-dependent Hartree-Fock theory",

author = "C. Simenel and Hinde, {D. J.} and {du Rietz}, R. and M. Dasgupta and M. Evers and Lin, {C. J.} and Luong, {D. H.} and A. Wakhle",

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doi = "10.1016/j.physletb.2012.03.063",

language = "English",

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T1 - Influence of entrance-channel magicity and isospin on quasi-fission

AU - Simenel, C.

AU - Hinde, D. J.

AU - du Rietz, R.

AU - Dasgupta, M.

AU - Evers, M.

AU - Lin, C. J.

AU - Luong, D. H.

AU - Wakhle, A.

PY - 2012/4/20

Y1 - 2012/4/20

N2 - 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 40Ca+ 208Pb 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.

AB - 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 40Ca+ 208Pb 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.

KW - Heavy-element formation

KW - Nuclear fusion

KW - Quasi-fission

KW - Time-dependent Hartree-Fock theory

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VL - 710

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EP - 611

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 4-5

ER -

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

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