Hypertriton and light nuclei production at A-production subthreshold energy in heavy-ion collisions

High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coales- cence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron （d）, triton （t）, helion （3He）, and hypertriton （~H） at subthreshold energy of A production...

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Published in中国物理C：英文版 Vol. 35; no. 8; pp. 741 - 746
Main Author 张松 陈金辉 马余刚 许长补 蔡翔舟 马国亮 钟晨
Format Journal Article
LanguageEnglish
Published 01.08.2011
Subjects
反应系统
发光模型
惩罚因子
模型预测
能源生产
轻原子核
阈值能量
高能重离子碰撞
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/35/8/008

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Summary:High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coales- cence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron （d）, triton （t）, helion （3He）, and hypertriton （~H） at subthreshold energy of A production （= 1 GeV per nucleon）. We study the dependence on the reaction system size of the coalescence penalty factor per additional nucleon and entropy per nucleon. The Strangeness Population Factor （S3 =3H/（3He ×∧/p）） shows an extra suppression of hypertriton comparing to light clusters of the same mass number. This model predicts a hypertriton production cross-section of a few μb in ^36Ar＋^36Ar, ^40Ca＋^40Ca and ^56Ni＋^56Ni in 1 A GeV reactions. The production rate is as high as a few hypertritons per million collisions, which shows that the fixed-target heavy-ion collisions at CSR （Lanzhou/China） at A subthreshold energy are suitable for breaking new ground in hypernuclear physics.
Bibliography:ZHANG Song, CHEN Jin-Hui, MA Yu-Gang, XU Zhang-Bu,CAI Xiang-Zhou, MA Guo-Liang,ZHONG Chen（1 Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800 2 Brookhaven National Laboratory, Upton, New York, 11973, USA）
hyperon, hypernuclei, dynamic coalescence
11-5641/O4
High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coales- cence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron （d）, triton （t）, helion （3He）, and hypertriton （~H） at subthreshold energy of A production （= 1 GeV per nucleon）. We study the dependence on the reaction system size of the coalescence penalty factor per additional nucleon and entropy per nucleon. The Strangeness Population Factor （S3 =3H/（3He ×∧/p）） shows an extra suppression of hypertriton comparing to light clusters of the same mass number. This model predicts a hypertriton production cross-section of a few μb in ^36Ar＋^36Ar, ^40Ca＋^40Ca and ^56Ni＋^56Ni in 1 A GeV reactions. The production rate is as high as a few hypertritons per million collisions, which shows that the fixed-target heavy-ion collisions at CSR （Lanzhou/China） at A subthreshold energy are suitable for breaking new ground in hypernuclear physics.
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/35/8/008