Measurement of ambient neutrons in an underground laboratory at Kamioka Observatory and future plan

Keita Mizukoshi, Ryosuke Taishaku, Keishi Hosokawa, Kazuyoshi Kobayashi, Kentaro Miuchi, Tatsuhiro Naka, Atsushi Takeda, Masashi Tanaka, Yoshiki Wada, Kohei Yorita, Sei Yoshida

研究成果: Conference article

抜粋

Ambient neutrons are one of the most serious backgrounds for underground experiments in search of rare events. The ambient neutron flux in an underground laboratory of Kamioka Observatory was measured using a 3He proportional counter with various moderator setups. Since the detector response largely depends on the spectral shape, the energy spectra of the neutrons transported from the rock to the laboratory were estimated by Monte-Carlo simulations. The ratio of the thermal neutron flux to the total neutron flux was found to depend on the thermalizing efficiency of the rock. Thus, the ratio of the count rate without a moderator to that with a moderator was used to determine this parameter. Consequently, the most-likely neutron spectrum predicted by the simulations for the parameters determined by the experimental results was obtained. The result suggests an interesting spectral shape, which has not been indicated in previous studies. The total ambient neutron flux is [1]. In this paper, we explain our method of the result and discuss our future plan.

元の言語English
記事番号012247
ジャーナルJournal of Physics: Conference Series
1468
発行部数1
DOI
出版物ステータスPublished - 2020 3 20
イベント16th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2019 - Toyama, Japan
継続期間: 2019 9 92019 9 13

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Mizukoshi, K., Taishaku, R., Hosokawa, K., Kobayashi, K., Miuchi, K., Naka, T., Takeda, A., Tanaka, M., Wada, Y., Yorita, K., & Yoshida, S. (2020). Measurement of ambient neutrons in an underground laboratory at Kamioka Observatory and future plan. Journal of Physics: Conference Series, 1468(1), [012247]. https://doi.org/10.1088/1742-6596/1468/1/012247