A detailed test of a BSO calorimeter with 100–800 MeV positrons

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 694; pp. 348 - 360
• Main Authors: Ishikawa, T., Fujimura, H., Hashimoto, R., Kaida, S., Kasagi, J., Kitazawa, R., Kuwasaki, S., Nakamura, A., Nawa, K., Okada, Y., Sato, M., Shimizu, H., Suzuki, K., Tajima, Y., Takahashi, S., Tsuchikawa, Y., Yamazaki, H., Yoshida, H.Y.
• Format: Journal Article
• Language: English
• Published: 01-12-2012
• Subjects: Accelerators; Beams (radiation); BGO (crystal); Crystals; Detectors; Energy (nuclear); Performance tests; Positrons
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2012.08.085

A performance test has been made for an electro-magnetic calorimeter prototype comprised four identical BSO crystals arranged in a 2X2 matrix by utilizing a positron beam in the energy range from 100 to 800 MeV. The size of each crystal is 40X40X210 mm3. This is the world's largest BSO single crystal ever used as a photon detector. The obtained energy resolution is (s E / E) 2 = ((1.71 % +/- 0.03 %) / E) 2 + (1.12 % +/- 0.08 %) 2 at room temperature, where E is the incident positron energy given in GeV. A BGO calorimeter having the same geometry has been employed in the performance test for comparison. The basic scintillation characteristics of BSO crystals measured without the beam are also presented.