論文

査読有り 筆頭著者 責任著者
2018年12月1日

Measurement of ambient neutrons in an underground laboratory at the Kamioka Observatory

Progress of Theoretical and Experimental Physics
  • Keita Mizukoshi
  • Ryosuke Taishaku
  • Keishi Hosokawa
  • Kazuyoshi Kobayashi
  • Kentaro Miuchi
  • Tatsuhiro Naka
  • Atsushi Takeda
  • Masashi Tanaka
  • Yoshiki Wada
  • Kohei Yorita
  • Sei Yoshida
  • 全て表示

2018
12
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1093/ptep/pty133
出版者・発行元
Oxford University Press (OUP)

Abstract

Ambient neutrons are one of the most serious backgrounds for underground experiments searching for rare events. The ambient neutron flux in an underground laboratory at the Kamioka Observatory was measured using a $\mathrm{^3He}$ 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. Therefore, 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 $(23.5 \pm 0.7 \ \mathrm{_{stat. } } ^{+1.9}_{-2.1} \ \mathrm{_{sys. } }) \times 10^{-6}$ cm$^{-2}$ s$^{-1}$. This result, especially the energy spectrum information, could be a new and important input for estimating the background in current and future experiments in the underground laboratory at the Kamioka Observatory.

リンク情報
DOI
https://doi.org/10.1093/ptep/pty133
arXiv
http://arxiv.org/abs/arXiv:1803.09757
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000456686200007&DestApp=WOS_CPL
URL
http://academic.oup.com/ptep/article-pdf/2018/12/123C01/27323103/pty133.pdf
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85063219725&origin=inward 本文へのリンクあり
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85063219725&origin=inward
ID情報
  • DOI : 10.1093/ptep/pty133
  • ISSN : 2050-3911
  • eISSN : 2050-3911
  • ORCIDのPut Code : 56495974
  • arXiv ID : arXiv:1803.09757
  • SCOPUS ID : 85063219725
  • Web of Science ID : WOS:000456686200007
  • ORCIDで取得されたその他外部ID : a:1:{i:0;a:1:{s:8:"other-id";s:7:"1664310";}}

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