A new cylindrical photon-veto detector for the KL→π0νν¯ experiment

R. Murayama, M. Togawa, J. K. Ahn, J. Comfort, T. Inagaki, M. Isoe, I. Kamiji, E. J. Kim, J. L. Kim, T. K. Komatsubara, G. Y. Lim, T. Matsumura, K. Miyazaki, H. Nanjo, T. Nomura, H. Okuno, E. Pod, T. Sato, K. Shiomi, Y. TajimaT. Toyoda, Y. W. Wah, H. Watanabe, T. Yamanaka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The J-PARC KOTO experiment aims to explore new physics beyond the Standard Model through the KL→π0νν¯ decay. We installed a new photon-veto detector, named the Inner Barrel (IB), to improve the detection efficiency and the timing resolution for photons in the region transverse to the neutral beam. The IB is a 2.8-m-long cylindrical detector with a 1.5 m inner diameter. The IB is a lead-scintillator sampling shower counter with a 5-radiation-length thickness and with a low mass support structure, and fits inside the 14-radiation-length-thick cylindrical detector. Scintillating light is read out from both ends via wavelength shifting fibers with a short decay time. The design, construction and performance of the IB are presented in this paper.

Bibliographical note

Funding Information:
We would like to express our gratitude to all the members of the J-PARC Accelerator and Hadron Experimental Facility groups for their support. This paper is based upon work supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan and the Japan Society for the Promotion of Science (JSPS) under the MEXT KAKENHI Grant Number JP18071006, the JSPS KAKENHI Grant Number JP23224007, and through the Japan-U.S. Cooperative Research Program in High Energy Physics; the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Numbers DE-SC0006497 and DE-SC0009798; and the National Research Foundation of Korea (2017R1A2B4006359). Some of the authors were supported by Grants-in-Aid for JSPS Fellows.

Funding Information:
We would like to express our gratitude to all the members of the J-PARC Accelerator and Hadron Experimental Facility groups for their support. This paper is based upon work supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan and the Japan Society for the Promotion of Science (JSPS) under the MEXT KAKENHI Grant Number JP18071006 , the JSPS KAKENHI Grant Number JP23224007 , and through the Japan-U.S. Cooperative Research Program in High Energy Physics ; the U.S. Department of Energy , Office of Science , Office of High Energy Physics , under Award Numbers DE-SC0006497 and DE-SC0009798 ; and the National Research Foundation of Korea ( 2017R1A2B4006359 ). Some of the authors were supported by Grants-in-Aid for JSPS Fellows.

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Kaon rare decay
  • Photon veto
  • Wavelength shifting (WLS) fiber

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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