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Observing the ping-pong modality of the isospin degree of freedom in cluster emission from heavy-ion reactions

Yijie Wang1,*, Fenhai Guan1, Xinyue Diao1, Mengting Wan2,3, Yuhao Qin1, Zhi Qin1, Qianghua Wu1, Dong Guo1, Dawei Si1 et al.

Sheng Xiao1, Boyuan Zhang1, Yaopeng Zhang1, Baiting Tian4, Xianglun Wei5, Herun Yang5, Peng Ma5, Rongjiang Hu5, Limin Duan5, Fangfang Duan5, Qiang Hu5, Junbing Ma5, Shiwei Xu5, Zhen Bai5, Yanyun Yang5, Jiansong Wang5,6, Wenbo Liu7, Wanqing Su7, Xiaobao Wei7, Chun-Wang Ma7, Xinxiang Li8,9, Hongwei Wang9,10, Fangyuan Wang11, Yingxun Zhang11, Michał Warda12, Arthur Dobrowolski12, Bożena Nerlo-Pomorska12, Krzysztof Pomorski12, Li Ou2,3,†, and Zhigang Xiao1,13,‡

  • 1Department of Physics, Tsinghua University, Beijing 100084, China
  • 2College of Physics and Technology, Guangxi Normal University, Guilin 541004, China
  • 3Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin 541004, China
  • 4College of Physics, Sichuan University, Sichuan, 610065, China
  • 5Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 6School of Science, Huzhou University, Huzhou, 313000, China
  • 7Institute of Particle and Nuclear Physics, Henan Normal University, Xinxiang 453007, China
  • 8School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
  • 9Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai 201800, China
  • 10Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai 201210, China
  • 11China Institute of Atomic Energy, Beijing 102413, China
  • 12Institute of Physics, Maria Curie Skłodowska University, 20-031 Lublin, Poland
  • 13Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing 100084, China

  • *yj-wang15@tsinghua.org.cn
  • †liou@gxnu.edu.cn
  • ‡xiaozg@tsinghua.edu.cn

Phys. Rev. C 107, L041601 – Published 11 April, 2023

DOI: https://doi.org/10.1103/PhysRevC.107.L041601

Abstract

Thermodynamic and chemical two-body correlations of the isotope-resolved clusters are measured in Kr86+Pb208reactions at 25 MeV/u. The yield and kinetic variables of the A=3 isobars are analyzed in coincidence with the intermediate mass fragments of 6≤A≤11. While the velocity spectra of both t and He3 exhibit scaling behavior over the type of the intermediate mass fragments, the yield ratios of t/He3 correlate reversely to the neutron-to-proton ratio N/Z of the latter, showing the ping-pong modality of the N/Z of the emitted particles. 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 to transport model calculations to the data is discussed.

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