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arXiv 1611.08970nucl-th
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用微观输运方法研究低能反质子引起的核碎裂

Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approach

Zhao-Qing Feng

摘要:

在兰州量子分子动力学(LQMD)输运模型框架下,对低能反质子引起的核碎裂进行了深入研究。提出了一种在相空间中构造初级碎片的聚结方法。碎片的二次衰变过程由众所周知的统计代码描述。发现反重子-重子湮灭释放的定域能量主要通过π-核子碰撞沉积在核中,导致了预平衡粒子的发射、裂变、核子蒸发和轻碎片等,奇异交换反应主导了超子的产生.平均质量损失随靶核质量数的增大而增大。由于裂变碎片的贡献,重靶在中等质量区域出现了一个凸起结构。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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