量子非欧姆阻尼环境中的重核熔合概率及热核裂变速率  

Heavy-ion Fusion Probability and Nuclear Fission Rate in a Quantum Non-Ohmic Environment

作　　者：张珈铭[1] 韩杰[1] 包景东[1] 

机构地区：[1]北京师范大学物理学院,北京100875

出　　处：《原子核物理评论》2016年第4期385-391,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11175021);高等学校博士学科点专项科研基金(20120003110025)~~

摘　　要：考虑处于量子非欧姆阻尼环境下的重核熔合及热核裂变系统的动力学,给出了数值模拟相应c数量子广义朗之万方程的方法。其中提出的产生任意关联量子色噪声的数值方法,适用于任意非马尔科夫过程噪声的产生。利用此方法计算了重核熔合概率,结果表明量子涨落对重核熔合具有"低抬高压"的效应:当粒子的初始动能小于(大于)临界初始动能时,量子涨落会增大(减小)粒子鞍点通过概率。非欧姆阻尼环境中粒子稳定通过概率随δ值的变化是非单调的,且当粒子初始动能小于(大于)临界初始动能,量子涨落会使稳定通过概率随δ值变化曲线的极大值位置向右(向左)漂移。此外,在热核裂变系统中,超欧姆阻尼环境会增大裂变速率,而量子涨落不仅显著增大裂变速率,还使裂变速率随δ值变化曲线的极大值位置发生漂移。Dynamics of heavy-ion fusion and nuclear fission system in a quantum non-Ohmic environment have been considered and a numerical simulation method to solve the corresponding c-number quantum generalized Langevin equation is proposed. The method of generating quantum colored noise with arbitrary correlation can be applied to generate noise of arbitrary non-Markov process. Calculating fusion probability of heavy nuclei with this method, the result has shown that the passing probability is enlarged（decreased） by the quantum fluctuation when the initial kinetic energy of the particle is less than（greater than） the critical initial kinetic energy. Steady passing probability of particle in non-Ohmic environment versus δ is nonmonotonic. Quantum fluctuation makes the maximum position of the curve drift towards right（left）, when the initial kinetic energy of the particle is less than（greater than） the critical initial kinetic energy. Furthermore, nuclear fission rate is larger in super-Ohmic environment. Quantum fluctuation enlarges nuclear fission rate and makes the the maximum position of nuclear fission rate versus δ drift.

关 键 词：反常扩散 量子噪声 熔合概率 热核裂变 

分 类 号：O415.6[理学—理论物理]