观测重离子反应中集团发射同位旋自由度的乒乓模态
Observing the Ping-pong Modality of Isospin Degree of Freedom in Cluster Emission from Heavy Ion Reactions
AI总结：
通过$^{86}$Kr+$^{208}$Pb反应中轻重集团符合测量，发现t/$^3$He比与伴随重集团$N/Z$反相关，揭示集团发射同位旋自由度的乒乓模态。
摘要：
在25 MeV/u能区的$^{86}$Kr+$^{208}$Pb反应中，测量了同位素分辨的轻、重集团两体关联。对A=3同量异位素氚核（triton）和$^3$He的产额及动力学变量，与较早时刻发射的$7\le A\le14$重集团进行符合分析。尽管氚核和$^3$He的速度谱均表现出不依赖于重集团类型的标度行为，但t/$^3$He产额比与后者的中子质子比$N/Z$呈反相关，揭示了发射集团$N/Z$的乒乓模态。余核$N/Z$保持初始系统数值这一共性被推广至重离子反应中的集团发射过程。文中还讨论了输运模型计算与实验数据的比较。
英文摘要：
Two-body correlations of the isotope-resolved light and heavy clusters are measured in $^{86}$Kr+$^{\rm 208}$Pb reactions at 25 MeV/u. The yield and kinetic variables of the $A=3$ isobars, triton and $^3$He, are analyzed in coincidence with the heavy clusters of $7\le A \le 14$ emitted at the earlier chance. While the velocity spectra of both triton and $^3$He exhibit scaling behavior over the type of the heavy clusters, the yield ratios of ${\rm t/^3He}$ correlate reversely to the neutron-to-proton ratio $N/Z$ of the latter, showing the ping-pong modality of the $N/Z$ of emitted clusters. The commonality that the $N/Z$ of the residues keeps the initial system value is extended to the cluster emission in heavy ion reactions. The comparison of transport model calculations to the data is discussed.
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