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

ZHANG Song; CHEN Jin-Hui; MA Yu-Gang; XU Zhang-Bu; CAI Xiang-Zhou; MA Guo-Liang; ZHONG Chen

doi:10.1088/1674-1137/35/8/008

Chinese Physics C> 2011, Vol. 35> Issue(8) : 741-746 DOI: 10.1088/1674-1137/35/8/008

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

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Abstract：
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 (³He), and hypertriton (_Λ³H) at subthreshold energy of Λ 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 / (³He × (Λ/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 Λ subthreshold energy are suitable for breaking new ground in hypernuclear physics.

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ZHANG Song, CHEN Jin-Hui, MA Yu-Gang, XU Zhang-Bu, CAI Xiang-Zhou, MA Guo-Liang and ZHONG Chen. Hypertriton and light nuclei production at Λ-production subthreshold energy in heavy-ion collisions[J]. Chinese Physics C, 2011, 35(8): 741-746. doi: 10.1088/1674-1137/35/8/008

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Received: 2010-11-15
Revised: 1900-01-01

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通讯作者: 陈斌, [email protected]

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2010-11-15

Accepted Date: 1900-01-01

Available Online: 2011-08-05

Abstract: 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 (³He), and hypertriton (_Λ³H) at subthreshold energy of Λ 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 / (³He × (Λ/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 Λ subthreshold energy are suitable for breaking new ground in hypernuclear physics.

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

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

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