Development of a liquid Xe photon detector for μ → eγ decay search experiment at PSI

Satoshi Mihara, Tadayoshi Doke, Yoshio Kamiya, Tetsuro Mashimo, Toshinori Mori, Hajime Nishiguchi, Wataru Ootani, Shuji Orito, Kenji Ozone, Ryu Sawada, Satoshi Suzuki, Go Tejima, Kazuhiro Terasawa, Kouichi Yahagi, Masaki Yamashita, Jun Yashima

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


We are developing a new type of photon detector for an experiment to search for muons decaying into a positron and gamma ray. Our sensitivity on the branching ratio is expected to reach 10-14 by use of the world's most intensive continuous muon beam at Paul Scherrer Institut (PSI). In this experiment, the photon detector will utilize liquid Xenon (Xe) as a scintillation material because of its fast response, large light yield, and high density. The scintillation light emitted in liquid Xe will be directly observed by photomultipliers (PMTs) located in the liquid without the use of a transmission window. In order to study the detector response to gamma rays, we have constructed a prototype with an active volume of 2.3 × 103 surrounded by 32 PMTs. The PMT is a new development enabling operation at temperatures as low as liquid Xe (165 K). Energy, position, and timing resolutions have been evaluated using gamma-ray sources ranging from 320 keV to 1835 keV. The performance of the prototype is presented in this article.

Original languageEnglish
Pages (from-to)588-591
Number of pages4
JournalIEEE Transactions on Nuclear Science
Issue number2
Publication statusPublished - 2002 Apr
Externally publishedYes


  • Photomultiplier (PMT)
  • Scintillation detector
  • Xenon

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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