Study of the detection unit of the calorimeter for the next generation Compton telescope [下一代康普顿望远镜的量能器探测单元研究]

作者：Liu W.; Liu X.^*; Tang S.; Sun Z.; Yu Y.; Wang W.; Chen R.; Fang F.; Chen J.; Yan D.; Zhang Y.; Wang S.; Zhang X.; Yue K.; Lu J.; Zhou B.; Zhao Y.

来源：Nuclear Techniques, 2020, 43(1): 010203.

DOI：10.11889/j.0253-3219.2020.hjs.43.010203

• Calorimeter
• CsI(Tl) crystal
• Dual-ended readout
• Energy resolution
• Position resolution

[Background]: Compared with other energy regions, little research of gamma-ray astronomy in the MeV energy region has been carried out, hence insufficient exploration of astrophysical information is available in the MeV energy region. [Purpose]: This study aims to investigate the gamma-ray astronomy of MeV energy region so as to provide reference for the design of the next generation Compton telescope calorimeter. [Methods]: A dual-ended readout gamma-ray detector was designed as the elementary detection unit of a calorimeter. The detector was made of a long CsI(Tl) bar with the size of 10 mm×10 mm×80 mm and wrapped by the ESR film. The photodiode (PD), the avalanche photodiode (APD) and the silicon photomultiplier tube (SiPM) were used respectively as photoelectric converters for the detector, and they were tested by using 137Cs source at different positions on the detector. [Results]: The results show that the total energy and interaction position of the incident gamma-ray can be determined by reading the signal amplitudes at two ends of the three photoelectric converters. The energy resolution for 662 keV gamma-ray is 5.9% (full width at half maxima, FWHM) and the position resolution is about 5.7 mm (FWHM), which is the best performance obtained in the case of SiPM readout. [Conclusions]: The detection unit designed in this paper can meet the performance requirements of the calorimeter of the next generation Compton telescope.

• 单位
  河南大学; 中国科学院大学