AI 中文总结
研究$^{204}$Pb($^{48}$Ca, xn)$^{252 - x}$No反应中No同位素产生，采用基于豪泽-费什巴赫模型及格里芬激子模型的统一方法，考虑预平衡粒子发射，发现其能显著增强对No产生截面实验数据的描述，可重现剩余核产生的入射能量依赖性。
AI 中文摘要
分析了在200至240 MeV的$^{48}$Ca能量下，$^{204}$Pb($^{48}$Ca, 2n)$^{250}$No反应中$^{250}$No同位素异构体产生的实验数据。采用基于豪泽-费什巴赫模型和格里芬激子模型的统一方法描述核反应，假设一次预平衡粒子发射。研究预平衡过程对No同位素产生的影响。发现考虑轻粒子的预平衡发射能显著（几个数量级）增强对No产生截面实验数据的描述，特别是基态和异构体态$^{250g,m}$No的产生。这使得能够重现剩余核产生的入射能量依赖性。
英文摘要
Experimental data on the production of $^{250}$No in its ground and isomeric states in the $^{204}$Pb($^{48}$Ca,2n)$^{250}$No reaction at $^{48}$Ca beam energies from 200 to 240 MeV are analyzed within a unified approach combining the Hauser--Feshbach statistical model and the Griffin exciton model, assuming the emission of one pre-equilibrium particle. The influence of pre-equilibrium processes on the production cross sections of the $^{249-251}$No isotopes is investigated. The inclusion of pre-equilibrium light-particle emission significantly improves the description of the measured production cross sections, particularly in the high-energy region, where differences of several orders of magnitude are obtained, and for the population of the ground and isomeric states of $^{250}$No. The proposed approach also reproduces the observed incident-energy dependence of the residual-nucleus production cross sections.
Comments7 pages, 5 figures, 32 references
