Speaker
Sei Ban
(ICEPP, The university of Tokyo)
Description
The MEG II experiment searches for the charged lepton flavor violation process, $\mu\rightarrow e^+ +\gamma$, with the target sensitivity of branching ratio : O(10$^{-14}$).
Gamma-rays are detected by the liquid xenon detector to reconstruct their energy, timing, and position. In the liquid xenon detector, 4092 VUV-sensitive MPPCs produced by Hamamatsu photonics are used. Decrease of photon detection efficiency (PDE) of MPPCs during beam time was a problem and we found the PDE recovers by annealing (heating). In the beginning of 2022, annealing of almost all MPPCs was conducted. In this poster, the result of this annealing will be presented.
Primary author
Sei Ban
(ICEPP, The university of Tokyo)
Co-authors
Atsushi Oya
(The University of Tokyo)
Ayaka Matsushita
(The University of Tokyo)
Fumihito Ikeda
(The University of Tokyo)
Kensuke Yamamoto
(The University of Tokyo)
Satoru Kobayashi
(The University of Tokyo)
Taku Yonemoto
(The University of Tokyo)
Toshinori Mori
(The University of Tokyo)
Toshiyuki Iwamoto
(The University of Tokyo)
Wataru Ootani
(The University of Tokyo)
Yusuke Uchiyama
(The University of Tokyo)
