Performance test of a lead-glass counter for the J-PARC E36 experiment

Y. Miyazaki, S. Shimizu, S. Bianchin, C. Djalali, D. Gill, J. Jiang, M. Hasinoff, K. Horie, Y. Igarashi, J. Imazato, A. Ivashkin, M. Kohl, R. Narikawa, R. Pywell, S. Strauch, M. Tabata, A. Toyoda, H. Yamazaki, T. Yoshioka

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Abstract

The J-PARC E36 experiment will search for a violation of lepton universality by a precise measurement of the ratio of the kaon decay widths RK=Γ(K+e+ν)/Γ(K+μ+ν). Charged particles will be identified by the combination of three independent systems: a lead-glass Cherenkov counter, an aerogel Cherenkov counter, and a time-of-flight measurement. The performance of the lead-glass Cherenkov counter was investigated with e+, μ+, and π+ beams in the relevant momentum region from the K+ decays. By using a polyethylene degrader to slow down the beam momentum in front of the lead-glass block, we succeeded in reducing the muon mis-identification probability down to 5% while maintaining a high e+ detection efficiency of 98%.

Original languageEnglish
Pages (from-to)13-17
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume779
DOIs
Publication statusPublished - Apr 11 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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    Miyazaki, Y., Shimizu, S., Bianchin, S., Djalali, C., Gill, D., Jiang, J., Hasinoff, M., Horie, K., Igarashi, Y., Imazato, J., Ivashkin, A., Kohl, M., Narikawa, R., Pywell, R., Strauch, S., Tabata, M., Toyoda, A., Yamazaki, H., & Yoshioka, T. (2015). Performance test of a lead-glass counter for the J-PARC E36 experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 779, 13-17. https://doi.org/10.1016/j.nima.2015.01.044