Barrel photon detector of the KEK K L 0 → π 0 ν over(ν, -) experiment

Y. Tajima, J. K. Ahn, Y. Akune, Y. Aruga, M. Doroshenko, Y. B. Hsiung, A. Iijima, Y. Ikemoto, T. Inagaki, S. Ishibashi, N. Ishihara, H. Ishii, M. Itaya, M. Iwai, T. Iwata, S. Kobayashi, S. Komatsu, T. K. Komatsubara, A. S. Kurilin, H. S. LeeS. Y. Lee, G. Y. Lim, T. Matsumura, A. Miura, T. Mizuhashi, H. Morii, T. Morimoto, T. Nomura, N. Nishi, J. Nix, H. Okuno, K. Omata, G. N. Perdue, S. Perov, S. Podolsky, K. Sakashita, H. Sato, T. Sato, M. Sekimoto, T. Shinkawa, Y. Sugaya, T. Sumida, Z. Tsamalaidze, Y. Wah, H. Watanabe, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Large lead/scintillator sandwich-type photon detectors, sensitive to visible energy depositions of 1 MeV, have been built for the K L 0 → π 0 ν over(ν, -) experiment at the KEK 12-GeV proton synchrotron. The front barrel (FB) is composed of 16 modules with a length of 2.75 m, forming the 1.5 m-diameter cylinder. The main barrel (MB) is composed of 32 modules with a length of 5.5 m, forming a 3.5 m-diameter cylinder. Scintillation light is read out through wavelength-shifter (WLS) fibers. In this paper, the design, construction and performance of these detectors together with some R&D results are reported.

Original languageEnglish
Pages (from-to)261-272
Number of pages12
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
Publication statusPublished - 2008 Jul 21
Externally publishedYes

Bibliographical note

Funding Information:
Construction of these large-scale vetoes within such a short time period would not have been possible without substantial contributions from technical staff members of collaborating institutes and companies. We express our sincere thanks to them. A mechanical design of the calorimeter was made by ENTEK-HTTC, Russia, under the ISTC (International Science Technology Center) program No. 2118. Part of this work was financially supported by a Grant-in-Aid for Scientific Research of the Ministry of Education, Science, Sports and Culture of Japan.


  • Kaon rare decay
  • Lead/scintillator sandwich-type photon detector
  • Wavelength-shifter (WLS) fiber readout

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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