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. Tajima; T. Toyoda; Y. W. Wah; H. Watanabe; T. Yamanaka

doi:10.1016/j.nima.2019.163255

A new cylindrical photon-veto detector for the K_L→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

Department of Physics

Research output: Contribution to journal › Article

Abstract

The J-PARC KOTO experiment aims to explore new physics beyond the Standard Model through the K_L→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.

Original language	English
Article number	163255
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	953
DOIs	https://doi.org/10.1016/j.nima.2019.163255
Publication status	Published - 2020 Feb 11

Keywords

Kaon rare decay
Photon veto
Wavelength shifting (WLS) fiber

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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Murayama, R., Togawa, M., Ahn, J. K., Comfort, J., Inagaki, T., Isoe, M., Kamiji, I., Kim, E. J., Kim, J. L., Komatsubara, T. K., Lim, G. Y., Matsumura, T., Miyazaki, K., Nanjo, H., Nomura, T., Okuno, H., Pod, E., Sato, T., Shiomi, K., ... Yamanaka, T. (2020). A new cylindrical photon-veto detector for the K_L→π⁰νν¯ experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 953, [163255]. https://doi.org/10.1016/j.nima.2019.163255

A new cylindrical photon-veto detector for the K_L→π⁰νν¯ experiment. / Murayama, R.; Togawa, M.; Ahn, J. K.; Comfort, J.; Inagaki, T.; Isoe, M.; Kamiji, I.; Kim, E. J.; Kim, J. L.; Komatsubara, T. K.; Lim, G. Y.; Matsumura, T.; Miyazaki, K.; Nanjo, H.; Nomura, T.; Okuno, H.; Pod, E.; Sato, T.; Shiomi, K.; Tajima, Y.; Toyoda, T.; Wah, Y. W.; Watanabe, H.; Yamanaka, T.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 953, 163255, 11.02.2020.

Research output: Contribution to journal › Article

Murayama, R, Togawa, M, Ahn, JK, Comfort, J, Inagaki, T, Isoe, M, Kamiji, I, Kim, EJ, Kim, JL, Komatsubara, TK, Lim, GY, Matsumura, T, Miyazaki, K, Nanjo, H, Nomura, T, Okuno, H, Pod, E, Sato, T, Shiomi, K, Tajima, Y, Toyoda, T, Wah, YW, Watanabe, H & Yamanaka, T 2020, 'A new cylindrical photon-veto detector for the K_L→π⁰νν¯ experiment', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 953, 163255. https://doi.org/10.1016/j.nima.2019.163255

Murayama, R. ; Togawa, M. ; Ahn, J. K. ; Comfort, J. ; Inagaki, T. ; Isoe, M. ; Kamiji, I. ; Kim, E. J. ; Kim, J. L. ; Komatsubara, T. K. ; Lim, G. Y. ; Matsumura, T. ; Miyazaki, K. ; Nanjo, H. ; Nomura, T. ; Okuno, H. ; Pod, E. ; Sato, T. ; Shiomi, K. ; Tajima, Y. ; Toyoda, T. ; Wah, Y. W. ; Watanabe, H. ; Yamanaka, T. / A new cylindrical photon-veto detector for the K_L→π⁰νν¯ experiment. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2020 ; Vol. 953.

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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.",

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AU - Murayama, R.

AU - Togawa, M.

AU - Ahn, J. K.

AU - Comfort, J.

AU - Inagaki, T.

AU - Isoe, M.

AU - Kamiji, I.

AU - Kim, E. J.

AU - Kim, J. L.

AU - Komatsubara, T. K.

AU - Lim, G. Y.

AU - Matsumura, T.

AU - Miyazaki, K.

AU - Nanjo, H.

AU - Nomura, T.

AU - Okuno, H.

AU - Pod, E.

AU - Sato, T.

AU - Shiomi, K.

AU - Tajima, Y.

AU - Toyoda, T.

AU - Wah, Y. W.

AU - Watanabe, H.

AU - Yamanaka, T.

PY - 2020/2/11

Y1 - 2020/2/11

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AB - 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.

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KW - Wavelength shifting (WLS) fiber

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