Measurement of the high energyγ-rays from heavy ion reactions usingČerenkov detector  

作　　者：Da-Wei Si Yan Zhou Sheng Xiao Zhi Qin Dong Guo Yu-Hao Qin Yi-Jie Wang Bo-Yuan Zhang Bai-Ting Tian Zhi-Gang Xiao 

机构地区：[1]Department of Physics,Tsinghua University,Beijing 100084,China

出　　处：《Nuclear Science and Techniques》2024年第2期123-130,共8页核技术（英文）

基　　金：This work was supported by the Ministry of Science and Technology(No.2020YFE0202001);by the National Natural Science Foundation of China(Nos.11961141004 and 12205160);Tsinghua University Initiative Scientific Research Program.

摘　　要：The energetic bremsstrahlung photons up to 100 MeV produced in heavy ion collisions can be used as a sensitive probe for short-range correlation in atomic nuclei. The energy of the γ-rays can be measured by collecting the Čerenkov light in the medium induced by the fast electrons generated in the Compton scattering or electromagnetic shower of the incident γray. Two types of detectors based on pure water and lead glass as sensitive materials were designed for this purpose. The γresponse and optical photon propagation in the detectors were simulated based on electromagnetic and optical processes in Geant4. The inherent energy resolutions of 0.022(4) + 0.51(2)∕E^(1/2)_(γ) for water and 0.0026(3) + 0.446(3)∕E^(1/2)_(γ) for lead glass were obtained. The geometry sizes of the lead glass and water were optimized to 30 cm × 30 cm × 30 cm and 60 cm × 60 cm ×120 cm, respectively, to detect high-energy γ-rays at 160 MeV. The Hough transform method was applied to reconstruct the direction of the incident γ-rays, providing the ability to experimentally distinguish the high-energy γ-rays produced in the reactions on the target from random background cosmic-ray muons.

关 键 词：Bremsstrahlungγ-rays Čerenkov GEANT4 Energy resolution Direction reconstruction Hough transform 

分 类 号：TL816.2[核科学技术—核技术及应用]