多重散射效应对部分相干源两粒子关联函数的影响  

Effects of rescattering on two-particle correlation function of partially coherent sources

作　　者：李淑侠[1] 叶红安[1] 谢芳[1] 宋秀丹[1] 

机构地区：[1]黑龙江大学电子工程学院,哈尔滨150080

出　　处：《中国科学：物理学、力学、天文学》2015年第4期29-36,共8页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金资助项目(批准号:11147016和11347139)

摘　　要：处理HBT多重散射的通常方法是经典二次碰撞的随机级联,但是全同两粒子干涉实际是量子效应,应该采用量子力学方法处理.本文基于Glauber散射理论模型,利用量子路径积分方法,通过多重散射对部分相干源发射函数作用一个吸收因子,来分析多重散射效应对部分相干源两粒子关联函数的影响.结果表明,多重散射作用使关联函数的相角不为零从而引起粒子发射源的不对称性,多重散射效应使粒子很难从源内发出,粒子趋于表面发射,发射时间变短,所以多重散射作用使粒子发射源半径减小.The normal method handling the HBT rescattering effect is classical random cascade of secondary collision in high energy heavy ion collisions program whose goal is to seek the quark-gluon plasma. Interferometry, also called Hanbury-Brown Twiss （HBT） effects, is an important tool to study the space-time feature of particle-emitting source, and is an effective method to examine the quantum chromodynamics phase transition. As the HBT interference phenomenon of two identical particles is quantum mechanical in nature, and HBT results are affected by the particle- emitting source collective expansion, excited-particle decays and rescattering of particles in the source, hence, these effects should be studied properly in quantum mechanics frame. In this thesis, based on Glauber＇s scattering model, we use the method of path integral to analysis the rescattering effect on two-particle correlation functions of the partially coherent sources and give the formulas of two-particle correlation functions adding a absorbing factor due to rescattering effect by studying the quantum transport of the interfering identity particle pair, which include the rescattering effect. The two-particle correlation functions of the partially coherent sources contain a phase which is sensitive to the asymmetry of the source emission function and the rescattering effect shift the phase from zero and cause asymmetry of particle emission source. We investigate the influence of rescattering in high energy heavy ion collision on two-particle correlation functions for the partially coherent sources by Monte Carlo calculations. The result shows that the rescattering effect makes the phase not equal zero, causing asymmetry of particle emission source. The rescattering effect makes particles hard to emit from the center of sources, particles tend to emit from the surface of sources and the emitting time shorten. The Gaussian-formula fit results to the simulated two-particle correlation functions indicate that rescattering effect leads to a smaller i

关 键 词：多重散射 两粒子关联 蒙特卡罗模拟计算 

分 类 号：O413.1[理学—理论物理]