基于兰州量子分子动力学(LQMD)模型,系统研究了低能反质子引起的核反应中原子核碎裂机制和粒子产生.在LQMD输运模型中,考虑了反重子-重子、重子-重子和介子-重子碰撞可能产生的弹性散射、湮灭反应、电荷交换和非弹性散射.发展了并合模型,用于相空间构造初级碎片产生.处于激发态的碎片退激是基于统计模型描述.研究结果说明超子主要是由于奇异性交换产生;重碎片裂变会导致中等质量区域碎片产额增加;反质子引起的核反应有利于产生s=-2和s=1奇特超核,并给出了产生截面.
Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model,the nuclear fragmentation and particle production induced by low-energy antiprotons have been investigated thoroughly.Production of strange particles in the antiproton induced nuclear reactions is modeled within the LQMD model,in which all possible reaction channels such as elastic scattering,annihilation,charge exchange and inelastic scattering in antibaryon-baryon,baryon-baryon and mesonbaryon collisions have been included.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 strangeness exchange reactions dominate the hyperon production.A bump structure in the domain of intermediate mass for heavy targets appears owing to the contribution of fission fragments.It has advantage to produce heavier hyperfragments and hypernuclides with strangeness s =-2 (double-A fragments) and s =1 (△-fragments) in antiproton induced reactions.The production cross sections are evaluated.
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