Probing high-momentum component in nucleon momentum distribution by neutron-proton bremsstrahlung γ-rays in heavy ion reactions
Yuhao Qin, Qinglin Niu, Dong Guo, Sheng Xiao, Baiting Tian, Yijie Wang, Z. Qin, Xinyue Diao, Fenhai Guan, Dawei Si, Boyuan Zhang, Yaopeng Zhang, Xianglun Wei, Herun Yang, Peng Ma, Haichuan Zou, Tianli Qiu, Xinjie Huang, Rongjiang Hu, Limin Duan, H. J. Ong, Y. Y. Yang, Shiwei Xu, K. Wang, Zhen Bai, Jun-Bing Ma, Fangfang Duan, Yang Guo, Qiang Hu, Hongwei Wang, B. Sun, Sergei P. Maydanyuk, Chang Xu, Zhigang Xiao
Abstract
The high momentum tail (HMT) of nucleons, as a signature of the short-range correlations in nuclei, has been investigated by the high-energy bremsstrahlung γ rays produced in 86Kr+124Sn at 25 MeV/nucleon. The energetic photons are measured by a CsI(Tl) hodoscope mounted on the spectrometer CSHINE. The energy spectrum ≥35 MeV can be reproduced by the Isospin- and Momentum-Dependent Boltzmann-Uehling-Uhlenbeck model calculations incorporating the photon production channel from np process in which the HMTs of nucleons is considered. A non-zero HMT ratio of about 15% is favored by the data. The effect of the capture channel np→dγ is demonstrated.