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Long term measurement of neutron flux at deep underground and evaluation of neutron contribution to rare event searches

Research Project

Project/Area Number 15K05100
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionThe University of Tokyo

Principal Investigator

Takeda Atsushi  東京大学, 宇宙線研究所, 助教 (40401286)

Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords暗黒物質探索 / ダブルベータ事象探索 / ニュートリノ観測 / 地下実験室 / 中性子束 / 中性子バックグラウンド / 暗黒物質探索実験 / 中性子検出器 / 季節変動
Outline of Final Research Achievements

We established a monitor system for neutron flux in deep underground site by using liquid scintillator, photo multipliers, and data aquisition equipments. We measured neutron flux at Kamioka Obserbatory (2700 m.w.e.) for more than 150 continuous days. Based on the measurements, we evaluated effect of neutron to background of XMASS experiment which is dark matter search experiment and has been running at the same term by using Monte Carlo simulation. As a result, improvement of sensitivity for dark matter search became possible owing to evaluation of neutron background as well as other contributions.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (4 results)

All 2017 2016

All Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] バックグラウンド事象を考慮した有効体積解析による暗黒物質探索2017

    • Author(s)
      竹田敦
    • Organizer
      日本物理学会 2017秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] WIMP search from XMASS-I fiducial volume data with background prediction2017

    • Author(s)
      竹田敦
    • Organizer
      15th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2017)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] XMASS実験:有効体積による暗黒物質探索2017

    • Author(s)
      竹田敦
    • Organizer
      日本物理学会
    • Place of Presentation
      大阪大学 豊中キャンパス
    • Related Report
      2016 Research-status Report
  • [Presentation] XMASSの中性子バックグラウンド2016

    • Author(s)
      竹田敦
    • Organizer
      「極低放射能技術」研究会 LBGT2016
    • Place of Presentation
      徳島大学 常三島キャンパス
    • Year and Date
      2016-03-13
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2019-03-29  

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