Performance study of a prototype pure CsI calorimeter for the KOTO experiment

E. Iwai, J. W. Lee, T. Masuda, D. McFarland, Y. Nakaya, Y. D. Ri, K. Sato, K. Shiomi, Y. Sugiyama, Y. Tajima, M. Tecchio, M. Togawa, Y. C. Tung, T. Yamanaka

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The performance of the CsI electromagnetic calorimeter to be used for the J-PARC E14 KOTO experiment for a rare decay KL → π0ν ν ¯ was studied by using a positron beam from an accelerator. The energy, timing, and position resolutions for energies up to 800 MeV were measured. We also developed a new method to reconstruct the incident angle of photons based on the shower shape recorded with the calorimeter, and evaluated the method to suppress possible backgrounds for KL → π0ν ν ¯ decay signals.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - Jun 21 2015


  • Electromagnetic calorimeter
  • K → πν ν ¯
  • KOTO experiment
  • Pure CsI

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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