p+Ni碰撞中Ni碎裂的总产生截面证据
Evidence of Ni break-up from total production cross sections in p+Ni collisions
摘要：
总生产截面的轻带电粒子（LCP），中间质量的碎片（IMF）和重反应产物的p+Ni碰撞文献中提供了比较与预测的两步模型中的质子束能量范围从反应阈值高达约3 GeV。模型截面的计算假设，该反应通过核子-核子碰撞的核内级联进行，然后从平衡的重靶残余物中蒸发粒子。所有反应产物的激发函数的形状很好地描述了模型计算。对于重反应产物，即比Al重的原子核，截面的大小得到了合理的再现，但对于较轻产物的截面却被系统地低估了。这一事实被用作支持对反应机理有显著分解贡献的论据。最近发表的p+Ni碰撞微分截面的研究结果支持了上述结论，表明靶核破裂的假设对于LCP和IMF的d2 σ/dOmega dE的良好再现是必不可少的.
英文摘要：
The total production cross sections of light charged particles (LCPs), intermediate mass fragments (IMFs) and heavy reaction products of p+Ni collisions available in the literature have been compared with predictions of a two-step model in the proton beam energy range from reaction threshold up to approximately 3 GeV. Model cross sections were calculated assuming, that the reaction proceeds via an intranuclear cascade of nucleon-nucleon collisions followed by evaporation of particles from an equilibrated, heavy target residuum. The shape of the excitation functions was well described by model calculations for all reaction products. The magnitude of the cross sections was reasonably well reproduced for heavy reaction products, i.e. for nuclei heavier than Al, but the cross sections for lighter products were systematically underestimated. This fact was used as an argument in favor of a significant break-up contribution to the reaction mechanism. The present conclusions are supported by recently published results of investigations of differential cross sections in p+Ni collisions, which showed that hypothesis of the break-up of target nucleus is indispensable for a good reproduction of d2 sigma/dOmega dE for LCPs and IMFs.
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