The emission of neutrons from heavy ion reactions is an important observable for studying the asymmetric nuclear equation of state and the reaction dynamics. A 20-unit neutron array has been developed and mounted on the compact spectrometer for heavy ion experiments (CSHINE) to measure the neutron spectra, neutron-neutron and neutron-proton correlation functions. Each unit consists of a 15×15×15cm3 plastic scintillator coupled to a ϕ=52mm photomultiplier. The Geant4 simulation with optical process is performed to investigate the time resolution and the neutron detection efficiency. The inherent time resolution of 212 ps is obtained by cosmic ray coincidence test. The n-γ discrimination and time-of-flight performance are given by 252Cf radioactive source test and beam test. The neutron energy spectra have been obtained in the angle range 30∘≤θlab≤51∘ in the beam experiment of 124Sn+124Sn at 25 MeV/u with CSHINE.
@article{arxiv.2406.18605,
title = {The neutron array of the compact spectrometer for heavy ion experiments in Fermi energy region},
author = {Dawei Si and Sheng Xiao and Yuhao Qin and Yijie Wang and Junhuai Xu and Baiting Tian and Boyuan Zhang and Dong Guo and Qin Zhi and Xiaobao Wei and Yibo Hao and Zengxiang Wang and Tianren Zhuo and Yuansheng Yang and Xianglun Wei and Herun Yang and Peng Ma and Limin Duan and Fangfang Duan and Junbing Ma and Shiwei Xu and Zhen Bai and Guo Yang and Yanyun Yang and Zhigang Xiao},
journal= {arXiv preprint arXiv:2406.18605},
year = {2025}
}