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Title: A new cylindrical photon-veto detector for the K L → π 0 ν ν ¯ experiment

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
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  1. Osaka University (Japan)
  2. Korea University, Seoul, (Korea, Republic of)
  3. Arizona State University, Tempe, AZ (United States)
  4. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  5. Kyoto University (Japan)
  6. Jeonbuk National University, Jeonju (Korea, Republic of)
  7. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); J-PARC Center, Tokai (Japan)
  8. National Defense Academy, Kanagawa (Japan)
  9. University of Chicago, IL (United States). Enrico Fermi Institute
  10. Yamagata University (Japan)
+ Show Author Affiliations

The J-PARC KOTO experiment aims to explore new physics beyond the Standard Model through the $$K_L$$ → $$π^0v\bar{v}$$ decay. Here 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.

Research Organization:
Arizona State Univ., Tempe, AZ (United States); University of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); Ministry of Education, Culture, Sports, Science, and Technology (MEXT); Japan Society for the Promotion of Science (JSPS); National Research Foundation of Korea (NRF)
Grant/Contract Number:
SC0006497; SC0009798; JP18071006; JP23224007; 2017R1A2B4006359
OSTI ID:
1801696
Alternate ID(s):
OSTI ID: 1702597
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 953, Issue C; ISSN 0168-9002
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ and K L → π 0 ν ν ¯ $$ {K}_L\to {\pi}^0\nu \overline{\nu} $$ in the Standard Model: status and perspectives journal November 2015
Barrel photon detector of the KEK experiment
  • Tajima, Y.; Ahn, J. K.; Akune, Y.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 592, Issue 3 https://doi.org/10.1016/j.nima.2008.04.080
journal July 2008
The Data Acquisition System for the KOTO Experiment journal June 2015
CP -violating decay K L 0 → π 0 νν¯ journal June 1989
Introduction to J-PARC journal January 2012
Development of a new photomultiplier tube with high sensitivity for a wavelength-shifter fiber readout
  • Itaya, M.; Inagaki, T.; Iwata, T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 522, Issue 3 https://doi.org/10.1016/j.nima.2003.11.201
journal April 2004
Performance study of a prototype pure CsI calorimeter for the KOTO experiment
  • Iwai, E.; Lee, J. W.; Masuda, T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 786 https://doi.org/10.1016/j.nima.2015.02.046
journal June 2015

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