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arXiv 1007.1935nucl-th
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中能重离子碰撞中的熵和轻团簇产生

Entropy and light cluster production in heavy-ion collisions at intermediate energies

Yogesh K. Vermani, Rajeev K. Puri

摘要:

用类氘类质子团簇比($d_{like}/p_{like}$)的概念,利用\emph{quantum molecular dynamics}(QMD)模型分析了中能重离子碰撞的熵产生。类氘核到类质子团簇的产率比作为参与者质子多重性的函数计算,与实验趋势密切一致。我们的模型预测表明,即使对于中心几何形状,也可能不存在完全的几何平衡。从类氘-类质子团簇的产额比中提取的表观熵反映了\emph{i.e.}的普适性特征,它受反应体积的控制,与靶-弹组合无关。计算了不同轰击能量下Ca+Ca和Nb+Nb中心碰撞的表观熵,与$4π$ Plastic Ball实验数据符合得很好。

英文摘要:

The entropy production in medium energy heavy-ion collisions is analyzed in terms of ratio of deuteronlike to protonlike clusters ($d_{like}/p_{like}$) using \emph{quantum molecular dynamics} (QMD) model. The yield ratios of deuteronlike-to-protonlike clusters calculated as a function of participant proton multiplicity closely agree with experimental trends. Our model predictions indicate that full thermodynamical equilibrium may not be there even for the central geometry. The apparent entropy extracted from the yield ratios of deuteronlike-to-protonlike clusters, however, reflects the universality characteristics \emph{i.e.} it is governed by the volume of reaction independent of the target-projectile combination. Our calculations for apparent entropy produced in central collisions of Ca+Ca and Nb+Nb at different bombarding energies are in good agreement with $4π$ Plastic Ball data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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