Probing high-momentum component in nucleon momentum distribution by neutron-proton bremsstrahlung {\gamma}-rays in heavy ion reactions

Author:

Yuhao Qin, Qinglin Niu, Dong Guo, Sheng Xiao, Baiting Tian, Yijie Wang, Zhi Qin, Xinyue Diao, Fenhai Guan, Dawei Si, Boyuan Zhang, Yaopeng Zhang, Xianglun Wei, Herun Yang, Peng Ma, Rongjiang Hu, Limin Duan, Fangfang Duan, Qiang Hu, Junbing Ma, Shiwei Xu, Zhen Bai, Yanyun Yang, Hongwei Wang, Baohua Sun, Sergei P. Maydanyuk, Chang Xu, Zhigang Xiao

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex)

journal:

date:

2023-07-19 16:00:00

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 $\gamma$ rays produced in $^{86}$Kr + $^{124}$Sn at 25 MeV/u. The energetic photons are measured by a CsI(Tl) hodoscope mounted on the spectrometer CSHINE. The energy spectrum above 30 MeV can be reproduced by the IBUU 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 $np \to d\gamma$ is demonstrated.

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