Study of entropy in intermediate-energy heavy ion collisions

• Published in: Chinese physics C Vol. 40; no. 3; pp. 74 - 78
• Main Author: 张霄吉 郭文军 李宪杰 王阔
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.03.2016
• Subjects: Atomic collisions; Atomic properties; Collision dynamics; Construction; Dynamical systems; Entropy; intermediate-energy heavy ion reaction; isospin effect; Mathematical models; Molecular dynamics; neutron-proton ratio; 中能重离子碰撞; 入射能量; 反应产物; 反应系统; 同位旋相关; 密度分布; 熵减; 量子分子动力学模型
• ISSN: 1674-1137; 0254-3052
• DOI: 10.1088/1674-1137/40/3/034103

Using the isospin-dependent quantum molecular dynamics model, the entropy of an intermediate-energy heavy ion collision system after the reaction and the number of deuteronlike and protonlike particles produced in the collision is calculated. In the collision, different parameters are used and the mass number used here is from40 to 93 at incident energy from 150 MeV to 1050 MeV. We build a new model in which the density distribution of the reaction product is used to calculate the size of the entropy. The entropy calculated with this model is in good agreement with experimental values. Our data reveals that with the increase of the neutron-proton ratio and impact parameter, the entropy of the reaction system decreases, and it increases with the increase of system mass and reaction energy.