Revisit to the yield ratio of triton and $^3$He as an indicator of neutron-rich neck emission

arXiv (Cornell University) Pub Date : 2023-11-13 DOI:10.48550/arxiv.2311.07095

Wang, Yijie, Wan, Mengting, Diao, Xinyue, Xiao, Sheng, Qin, Yuhao, Qin, Zhi, Guo, Dong, Si, Dawei, Zhang, Boyuan, Tian, Baiting, Guan, Fenhai, Wu, Qianghua, Wei, Xianglun, Yang, Herun, Ma, Peng, Hu, Rongjiang, Duan, Limin, Duan, Fangfang, Ma, Junbing, Xu, Shiwei, Hu, Qiang, Bai, Zhen, Yang, Yanyun, Wang, Jiansong, Liu, Wenbo, Su, Wanqing, Wei, Xiaobao, Ma, Chunwang, Li, Xinxiang, Wang, Hongwei, Zhang, Yingxun, Warda, Michał, Dobrowolski, Arthur, Nerlo-Pomorska, Bożena, Pomorski, Krzysztof, Ou, Li, Xiao, Zhigang

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Abstract

The neutron rich neck zone created in heavy ion reaction is experimentally probed by the production of the $A=3$ isobars. The energy spectra and angular distributions of triton and $^3$He are measured with the CSHINE detector in $^{86}$Kr +$^{208}$Pb reactions at 25 MeV/u. While the energy spectrum of $^{3}$He is harder than that of triton, known as "$^{3}$He-puzzle", the yield ratio $R({\rm t/^3He})$ presents a robust rising trend with the polar angle in laboratory. Using the fission fragments to reconstruct the fission plane, the enhancement of out-plane $R({\rm t/^3He})$ is confirmed in comparison to the in-plane ratios. Transport model simulations reproduce qualitatively the experimental trends, but the quantitative agreement is not achieved. The results demonstrate that a neutron rich neck zone is formed in the reactions. Further studies are called for to understand the clustering and the isospin dynamics related to neck formation.

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重述triton和$^3$He的产率比作为富中子颈发射的指标

通过产生$A=3$等压线，对重离子反应中产生的富中子颈区进行了实验探测。用CSHINE探测器测量了25 MeV/u下$^{86}$Kr +$^{208}$Pb反应中triton和$^3$He的能谱和角分布。虽然$^{3}$He的能谱比triton的能谱硬，被称为“$^{3}$He-puzzle”，但在实验室中，产率$R({\rm t/^3He})$随着极角的增大呈现出强劲的上升趋势。利用裂变碎片重建裂变面，证实了面外$R({\rm t/^3He})$比面内比值的增强。输运模式模拟在定性上再现了实验趋势，但在定量上不一致。结果表明，在反应过程中形成了一个富中子颈区。需要进一步的研究来了解与颈部形成有关的聚类和同位旋动力学。

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arXiv (Cornell University)

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