Commissioning of liquid xenon gamma-ray detector for MEG II experiment

Ayaka Matsushita,Sei Ban,Hicham Benmansour, Giovanni Dal Maso,Marco Francesconi,Luca Galli, Fumihito Ikeda,Toshiyuki Iwamoto,Satoru Kobayashi,Toshinori Mori,Donato Nicolo,Rina Onda,Wataru Ootani,Atsushi Oya,Shinji Ogawa,Angela Papa,Patrick Schwendimann,Yusuke Uchiyama, Bastiano Vitali,Kensuke Yamamoto

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT（2023）

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摘要

The liquid xenon (LXe) gamma-ray detector in the MEG II experiment measures the energy, position and timing of the gamma-ray from μ+→e+γ, and it is the key to the unprecedented sensitivity of the experiment. All the photo sensors of 4092 VUV MPPCs and 668 PMTs were read out for the first time and a physics data collection started in 2021. The detector response was monitored all through the beam time, and the LXe detector operated stably. The timing and energy resolution were measured using the gamma-rays from the π0 decays after charge exchange reaction of charged pions in a liquid hydrogen target. The detector has been successfully commissioned and is ready for the long physics run.

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关键词

Calorimetry,SiPM,Liquid xenon

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