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Improved method for the experimental determination of in-medium effects from heavy-ion collisions
Journal of Physics G: Nuclear and Particle Physics ( IF 3.5 ) Pub Date : 2020-09-15 , DOI: 10.1088/1361-6471/aba561
Helena Pais 1 , Rmi Bougault 2 , Francesca Gulminelli 2 , Constana Providncia 1 , Eric Bonnet 3 , Bernard Borderie 4 , Abdelouahad Chbihi 5 , John D Frankland 5 , Emmanuelle Galichet 4, 6 , Digo Gruyer 2 , Maxime Henri 5 , Nicolas Le Neindre 2 , Olivier Lopez 2 , Loredana Manduci 2, 7 , Marian Parlg 2 , Giuseppe Verde 8
Affiliation  

The equation of state with light clusters for nuclear and stellar matter is determined using chemical equilibrium constants evaluated from the analysis of the recently published (Xe + Sn) heavy ion data, corresponding to three reactions with different isotopic contents of the emission source. The measured multiplicities are used to extract the thermodynamic properties, and an in-medium correction to the ideal gas internal partition function of the clusters is included in the analysis. This in-medium correction and its respective uncertainty are calculated via a Bayesian analysis, with the unique hypothesis that the different nuclear species in a given sample must correspond to a unique common value for the density of the expanding source. Different parameter sets for the correction are tested, and the effect of the radius of the clusters on the thermodynamics and on the chemical equilibrium constants is also addressed. It is shown that the equilibrium constants obtained are almo...

中文翻译:

实验确定重离子碰撞中效的改进方法

核和恒星物质具有轻簇的状态方程是使用化学平衡常数确定的,该常数是根据最近发表的(Xe + Sn)重离子数据的分析评估的,该数据对应于具有不同同位素含量排放源的三个反应。测得的多重度用于提取热力学性质,分析中包括对团簇的理想气体内部分配函数的中等校正。通过贝叶斯分析来计算这种中等校正和其相应的不确定性,唯一的假设是给定样本中的不同核素必须对应于扩展源密度的唯一公共值。测试了用于校正的不同参数集,以及团簇半径对热力学和化学平衡常数的影响。结果表明,所获得的平衡常数为零。
更新日期:2020-09-16
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