Isospin dependence of nuclear multifragmentation in statistical model

The evolution of nuclear disintegration mechanisms with increasing excitation energy, from compound nucleus to multifragmentation, has been studied by using the Statistical Multifragmentation Model （SMM） within a micro-canonical ensemble. We discuss the observable characteristics as functions of exc...

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Published inChinese physics C Vol. 35; no. 6; pp. 567 - 571
Main Author 张蕾 谢东珠 张艳萍 高远
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.06.2011
School of Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China%College of Mathematics and Sciences, Shanghai Normal University, Shanghai 200234, China%Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China
Subjects
Decay
Energy (nuclear)
Energy use
Evaporation
Evolution
Excitation
Mathematical models
Nuclei
同位旋
多重碎裂
子系统
微正则系综
激发能量
统计模型
衰减机制
计算结果
statistical model
microcanonical ensemble
multifragmentation
isospin dependence
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Summary:The evolution of nuclear disintegration mechanisms with increasing excitation energy, from compound nucleus to multifragmentation, has been studied by using the Statistical Multifragmentation Model （SMM） within a micro-canonical ensemble. We discuss the observable characteristics as functions of excitation energy in multifragmentation, concentrating on the isospin dependence of the model in its decaying mechanism and break-up fragment configuration by comparing the A0 = 200, Z0 = 78 and A0 = 200, Z0 = 100 systems. The calculations indicate that the neutron-rich system （Z0 = 78） translates to a fission-like process from evaporation later than the symmetric nucleus at a lower excitation energy, but gets a larger average multiplicity as the excitation energy increases above 1.0 MeV/u.
Bibliography:11-5641/O4
ZHANG Lei1, XIE Dong-Zhu, ZHANG Yan-Ping, GAO Yuan（1School of Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China 2 College of Mathematics and Sciences, Shanghai Normal University, Shanghai 200234, China 3 Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China）
statistical model; multifragmentation; microcanonical ensemble; isospin dependence
The evolution of nuclear disintegration mechanisms with increasing excitation energy, from compound nucleus to multifragmentation, has been studied by using the Statistical Multifragmentation Model （SMM） within a micro-canonical ensemble. We discuss the observable characteristics as functions of excitation energy in multifragmentation, concentrating on the isospin dependence of the model in its decaying mechanism and break-up fragment configuration by comparing the A0 = 200, Z0 = 78 and A0 = 200, Z0 = 100 systems. The calculations indicate that the neutron-rich system （Z0 = 78） translates to a fission-like process from evaporation later than the symmetric nucleus at a lower excitation energy, but gets a larger average multiplicity as the excitation energy increases above 1.0 MeV/u.
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1674-1137
0254-3052
2058-6132
DOI:10.1088/1674-1137/35/6/011