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

Hypertriton and light nuclei production at Λ-production subthreshold energy in heavy-ion collisions
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重离子碰撞中 α 产生亚阈值能量的超氚核和轻核产生

DOI:
10.1088/1674-1137/35/8/008
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发表时间:
2011-08
期刊:
影响因子:
3.6
通讯作者:
--
中科院分区:
物理与天体物理3区
文献类型:
--
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高能重离子碰撞产生丰富的超子和核子。采用动力学聚结模型和ART模型相结合的方法,研究了在A产生的亚阈值能量(约为每核子1GeV)下,轻团簇、重离子(D)、Triton(T)、氦离子((3)He)和超三子((3)(A)H)的产生几率。我们研究了每附加核子的聚结惩罚因子和每核子的熵对反应体系大小的依赖关系。奇异布居因子(S(3)=(3)(A)H/((3)He×A/p))比相同质量数的轻团簇显示出额外的超强子抑制。该模型预测了在1AGeV反应中,(36)Ar+(36)Ar,(40)Ca+(40)Ca和(56)Ni+(56)Ni中几个µb的超电子产生截面。它的产生率高达每百万次碰撞几个超微子,这表明CSR(兰州/中国)在A亚阈值能量下的固定靶重离子碰撞适合于在超核物理中取得新的突破。
High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coalescence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron (d), triton (t), helion ((3)He), and hypertriton ((3)(A)H) at subthreshold energy of A production (approximate to 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 (S(3) =(3)(A)H/((3)He x A/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 mu b in (36)Ar+(36)Ar, (40)Ca+(40)Ca and (56)Ni+(56)Ni 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.
通过超核和重子奇异性相关性寻找解禁闭的开始
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