多维扩散模型研究核熔合及核裂变过程

This project calculate the inertia tensor (Werner-Wheeler method) and viscosity tensor (one-body dissipation model) analytically and numerically in the five-parameter dumbbell model, in which we can describe nuclear fusion with different types of collisions. On all of above, we discuss the calculated probability of nuclear fusion or fission by multidimensional variable-coefficient Langevin dynamics to simulate the reaction of superheavy nuclei. We analyze and compare the calculated results with that of other models and experimental data. At last, we discuss the effect of neck between projectile and target in nuclear fusion (or fragments in nuclear fission), and give a new understanding of nuclear reaction.

本项目在能够描述不同碰撞类型的五参数哑铃模型下，解析与数值相结合，采用高精度算法分别计算核体系的惯性张量(Werner-Wheeler方法)和粘滞张量(一体耗散模型)。在此基础上，对生成超重核的核熔合反应和超重核裂变进行多维变系数Langevin动力学模拟，计算熔合概率和准裂变概率，与实验数据和其他模型进行对比分析。并分析和解释核反应过程中弹靶核之间的颈部（或者是裂变碎片之间的颈部）对核反应的影响，给出一种对核反应的新理解。

本项目在多维扩散模型的基础上，数值计算与解析推导相结合，采用多维大型数据网格插值法来计算各种物理模型和各类高精度的物理参数，采用多维朗之万(Langevin)模拟计算核反应和重离子反应等问题。在此基础上，研究和讨论了原子核反应，轻核，中核，重核，原子与分子，等离子，离子晶体等物理问题，得到了很多有意义的结果以及给出了很多有意义的物理解释。