Reconstruction of fission events in heavy ion reactions with the compact spectrometer for heavy ion experiment

• Published in: Nuclear science and techniques Vol. 33; no. 4; pp. 1 - 9
• Main Authors: Diao, Xin-Yue, Guan, Fen-Hai, Wang, Yi-Jie, Qin, Yu-Hao, Qin, Zhi, Guo, Dong, Wu, Qiang-Hua, Si, Da-Wei, Zhao, Xuan, Xiao, Sheng, Zhang, Yao-Peng, Wei, Xiang-Lun, Zou, Hai-Chuan, Yang, He-Run, Ma, Peng, Hu, Rong-Jiang, Duan, Li-Min, Dobrowolski, Artur, Pomorski, Krzysztof, Xiao, Zhi-Gang
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.04.2022; Department of Physics,Tsinghua University,Beijing 100084,China%Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China%School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China%Institute of Physics,Maria Curie Sk?odowska University,Lublin 20031,Poland
• Subjects: Beam Physics; Nuclear Energy; Particle Acceleration and Detection; Particle and Nuclear Physics; Physics; Physics and Astronomy; Heavy ion reactions; CSHINE; Fast fission; Parallel-plate avalanche counter
• ISSN: 1001-8042; 2210-3147
• DOI: 10.1007/s41365-022-01024-y

We report a reconstruction method for fast-fission events in 25 MeV/u 86 Kr + 208 Pb reactions at the Compact Spectrometer for Heavy Ion Experiment (CSHINE). The fission fragments (FFs) are measured using three large-area parallel-plate avalanche counters, which can deliver the position and arrival timing information of the fragments. The start timing information is provided by the radio frequency of the cyclotron. Fission events were reconstructed using the velocities of the two FFs. The broadening of both the velocity distribution and azimuthal difference of the FFs decreases with the folding angle, in accordance with the picture that fast fission occurs. The anisotropic angular distribution of the fission axis also consistently reveals the dynamic features of fission events.