Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approach
Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approach
复制标题
微观传输方法中低能反质子引起的核碎裂
DOI：
10.1103/physrevc.94.064601
复制
发表时间：
2016-11
影响因子：
3.1
通讯作者：
Zhao-Qing Feng
中科院分区：
文献类型：
--
作者：
Zhao-Qing Feng
在兰州量子分子动力学（LQMD）输运模型的框架内，对低能反质子诱导的核碎裂进行了深入的研究。提出了一种在相空间中构造初级碎片的聚并方法。碎片的二次衰减过程由众所周知的统计代码描述。研究发现，反重子-重子湮灭过程中释放的局域能量主要通过介子-核子碰撞的方式沉积在原子核中，导致预平衡粒子的发射、裂变、核子的蒸发和轻碎片等。奇异交换反应主导着超子的产生。平均质量损失随靶核质量数的增加而增加。由于裂变碎片的贡献，在重目标的中质量域中出现了碰撞结构。
Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, the nuclear fragmentation induced by low-energy antiprotons has been investigated thoroughly. A coalescence approach is developed for constructing the primary fragments in phase space. The secondary decay process of the fragments is described by the well-known statistical code. It is found that the localized energy released in antibaryon-baryon annihilation is deposited in a nucleus mainly via pion-nucleon collisions, which leads to the emissions of pre-equilibrium particles, fission, evaporation of nucleons and light fragments etc. The strangeness exchange reactions dominate the hyperon production. The averaged mass loss increases with the mass number of target nucleus. A bump structure in the domain of intermediate mass for heavy targets appears owing to the contribution of fission fragments.