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Title:
Development of a low-mass and high-efficiency charged-particle detector
Authors:
Naito, D.; Maeda, Y.; Kawasaki, N.; Masuda, T.; Nanjo, H.; Nomura, T.; Sasaki, M.; Sasao, N.; Seki, S.; Shiomi, K.; Tajima, Y.
Affiliation:
AA(Department of Physics, Kyoto University, Kyoto 606-8502, Japan ), AB(Department of Physics, Kyoto University, Kyoto 606-8502, Japan; Present address: Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602, Japan), AC(Department of Physics, Kyoto University, Kyoto 606-8502, Japan), AD(Department of Physics, Kyoto University, Kyoto 606-8502, Japan; Present address: Research Core for Extreme Quantum World, Okayama University, Okayama 700-8530, Japan), AE(Department of Physics, Kyoto University, Kyoto 606-8502, Japan), AF(High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan), AG(Department of Physics, Yamagata University, Yamagata 990-8560, Japan), AH(Research Core for Extreme Quantum World, Okayama University, Okayama 700-8530, Japan), AI(Department of Physics, Kyoto University, Kyoto 606-8502, Japan), AJ(Department of Physics, Kyoto University, Kyoto 606-8502, Japan; Present address: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan), AK(Department of Physics, Yamagata University, Yamagata 990-8560, Japan)
Publication:
Progress of Theoretical and Experimental Physics, Volume 2016, Issue 2, id.023C01 17 pp. (OUP Homepage)
Publication Date:
02/2016
Origin:
OUP
Keywords:
C30, H10
Abstract Copyright:
The Author(s) 2016. Published by Oxford University Press on behalf of the Physical Society of Japan.
DOI:
10.1093/ptep/ptv191
Bibliographic Code:
2016PTEP.2016b3C01N

Abstract

We have developed a low-mass and high-efficiency charged-particle detector for an experimental study of the rare decay K_L rArr pi ^0 nu bar {nu }. The detector is important for suppressing the background with charged particles to the level below the signal branching ratio predicted by the Standard Model (O(10^{-11})). The detector consists of two layers of 3 mm thick plastic scintillators with embedded wavelength-shifting fibers and multi-pixel photon counters for the readout. We manufactured the counter and evaluated the performance in terms of light yield, timing resolution, and efficiency. With this design, we achieved an inefficiency per layer against penetrating charged particles of less than 1.5 × 10^{-5}, which satisfies the requirement of the KOTO experiment determined from simulation studies.
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