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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