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A CsI hodoscope on CSHINE for Bremsstrahlung {\gamma}-rays in Heavy Ion Reactions

Yuhao QinDong GuoSheng Xiao ...+21 Zhigang Xiao
Dec 2022
摘要
Bremsstrahlung $\gamma$ production in heavy ion reactions at Fermi energiescarries important physical information including the nuclear symmetry energy atsupra-saturation densities. In order to detect the high energy Bremsstrahlung$\gamma$ rays, a hodoscope consisting of 15 CsI(Tl) crystal read out by photomultiplier tubes has been built, tested and operated in experiment. Theresolution, efficiency and linear response of the units to $\gamma$ rays havebeen studied using radioactive source and $({\rm p},\gamma)$ reactions. Theinherent energy resolution of $1.6\%+2\%/E_{\gamma}^{1/2}$ is obtained.Reconstruction method has been established through Geant 4 simulations,reproducing the experimental results where comparison can be made. Using thereconstruction method developed, the whole efficiency of the hodoscope is about$2.6\times 10^{-4}$ against the $4\pi$ emissions at the target position,exhibiting insignificant dependence on the energy of incident $\gamma$ raysabove 20 MeV. The hodoscope is operated in the experiment of $^{86}$Kr +$^{124}$Sn at 25 MeV/u, and a full $\gamma$ energy spectrum up to 80 MeV hasbeen obtained.
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