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arXiv · 2211.05081

Large area LaBr3:Ce crystals read by SiPM arrays with improved timing and temperature gain drift control

M. Bonesini·R. Benocci·R. Bertoni·A. Menegolli·M. Prata·M. Rossella·R. Rossini
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Abstract

Compact X-rays detectors made of 1/2" or 1" :LaBr3:Ce crystals of cubic shape with SiPM array readout have been developed for the FAMU experiment at RIKEN-RAL. The aim is a precise measurement of the proton Zemach radius with incoming muons. Additional applications may be found in medical physics, such as PET, homeland security and gamma-ray astronomy. Due to the high photon yield of LaBr3:Ce it was possible to use a simple readout scheme based on CAEN V1730 digitizers. Detectors, using Hamamatsu S13361 or S14161 arrays, have good FWHM energy resolutions up to 3 % (8 %) at the Cs137 Co57) peak, comparing well with the best results obtained with a photomultiplier's readout. Detailed studies were performed to correct online the drift with temperature of SiPM gain and to reduce the risetime/falltime of detectors' signals, that increased going from 1/2" to 1" detectors, due to the larger capacity of the used SiPM arrays.

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M. Bonesini, R. Benocci, R. Bertoni, A. Menegolli, M. Prata, M. Rossella, R. Rossini. 2022-11-09. Large area LaBr3:Ce crystals read by SiPM arrays with improved timing and temperature gain drift control. https://doi.org/10.1016/j.nima.2022.167677

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