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

作　　者：张松 陈金辉 马余刚 许长补 蔡翔舟 马国亮 钟晨 

机构地区：[1]Shanghai Institute of Applied Physics,the Chinese Academy of Sciences [2]Brookhaven National Laboratory,Upton,New York,11973,USA

出　　处：《Chinese Physics C》2011年第8期741-746,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (Y155017011,10775167,10875159,10905085,11035009,11047116);Knowledge Innovation Project of Chinese Academy of Sciences (KJCX2-EW-N01)

摘　　要：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.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.

关 键 词：HYPERON HYPERNUCLEI dynamic coalescence 

分 类 号：O572.243[理学—粒子物理与原子核物理]