Production of proton-rich nuclei around Z=84-90 in fusion-evaporation reactions
Production of proton-rich nuclei around Z=84-90 in fusion-evaporation reactions
复制标题
在聚变蒸发反应中 Z=84-90 附近产生富质子核
DOI：
10.1140/epja/i2017-12281-x
复制
发表时间：
2017
影响因子：
2.7
通讯作者：
靳根明
中科院分区：
文献类型：
--
作者：
陈鹏辉;冯兆庆;牛菲;郭亚飞;张鸿飞;李君清;靳根明
在双核系统模型的框架内，生产出富含质子的截面。系统地研究了Z = 84-90的带电数原子核。可能的组合。28Si, 32S， 40Ar轰击目标核素165Ho， 169Tm, 170-174Yb, 175,176Lu, 174,176-180Hf和。它们被彻底地分析了。提出了最佳激发能和蒸发通道。产生富含质子的原子核。该系统在实验中是可行的。它被发现了。N = 126的中子壳层闭合在中子蒸发过程中具有重要意义。的。40Ar诱导反应的实验激发函数可以很好地再现。带电。特别是在冷却激发的富含质子的原子核方面，粒子蒸发与中子相当。对于有和质子蒸发的通道。生产截面随质量增大而增大。由于内部聚变势垒的减少导致碰撞系统的不对称性。通道与。纯中子蒸发取决于同位素靶。但对于带电荷的通道则不同。粒子对奇偶效应更敏感。
Within the framework of the dinuclear system model, production cross sections of proton-rich.nuclei with charged numbers of Z = 84–90 are investigated systematically. Possible combinations with.the 28Si, 32S, 40Ar bombarding the target nuclides 165Ho, 169Tm, 170–174Yb, 175,176Lu, 174,176–180Hf and.181Ta are analyzed thoroughly. The optimal excitation energies and evaporation channels are proposed.to produce the proton-rich nuclei. The systems are feasible to be constructed in experiments. It is found.that the neutron shell closure of N = 126 is of importance during the evaporation of neutrons. The.experimental excitation functions in the 40Ar induced reactions can be nicely reproduced. The charged.particle evaporation is comparable with neutrons in cooling the excited proton-rich nuclei, in particular.for the channels with and proton evaporation. The production cross section increases with the mass.asymmetry of colliding systems because of the decrease of the inner fusion barrier. The channels with.pure neutron evaporation depend on the isotopic targets. But it is different for the channels with charged.particles and more sensitive to the odd-even effect.