反对称化量子分子动力学模型

Antisymmetrized molecular dynamics model

主要针对一种分子动力学(QMD)模型软件的发展版本:反对称化量子分子动力学模型(AMD),在对模型软件基本原理和程序结构流程两方面进行详细描述基础上,结合GEMINI模型,提出一种方法应用AMD模型对重离子反应45MeV/n的58Ni+58Ni进行模拟来获取初级碎片和次级碎片的基本信息,继而从模拟得到的信息中提取出观测量质量多重性分布和中子-质子产额比,对比两种观测量,实验表明次级衰变效应对核反应产物性质的影响很大,最后得出了核子反应后次级碎片已经失去了由最初发射源发射出的初级碎片的大部分特征的重要结论。

In this paper, Antisymmetrized Molecular Dynamics （AMD） model, which is developed from Quantum Molecular Dynamics （QMD） model, was introduced in detail, ineluding the rationale and the structural flow-chart of the program. Additionally eombining with GEMINI code, the heavy-ion reactions of5s Ni ＋ 5s Ni 45 MeV/n was simulated using AMD model to obtain the basic information of both hot primary fragments and cool secondary fragments. The mass-muhiplieity distribution and neutron/proton （n/p） ratio were extracted from this information, and the sequential decay dependence of these two observables was investigated. Based on this work, the conclusion that the sequential decays strongly affect the observables from experimental measurements is finally drawn.