| Project/Area Number |
13304021
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | Waseda University |
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Principal Investigator |
SUZUKI Satoshi Waseda University, Advanced Research Institute for Science and Engineering, Associate Professor, 理工学総合研究センター, 助教授 (30318828)
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| Co-Investigator(Kenkyū-buntansha) |
TAKIZAWA Kyoko Waseda University, Adv.Res.Inst.Sci. & Eng., Lecture, 理工学総合研究センター, 助手 (80339746)
TERASAWA Kazuhiro Waseda University, Adv.Res.Inst.Sci. & Eng., Lecture, 理工学総合研究センター, 講師 (10329138)
OKADA Hiroyuki Waseda University, Adv.Res.Inst.Sci. & Eng., Lecture, 理工学総合研究センター, 講師 (20308258)
OOTANI Wataru University of Tokyo, ICEPP, Assistant, 素粒子物理国際センター, 助手 (30311335)
MORIYAMA Sigetaka University of Tokyo, ICRR, Assistant, 宇宙線研究所, 助手 (50313044)
竹内 康雄 東京大学, 宇宙線研究所, 助手 (60272522)
森 俊則 東京大学, 素粒子物理国際研究センター, 助教授 (90220011)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2002: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
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| Keywords | Dark Matter / Liquid Xenon / Proportional Scintillation / WIMPs / Double Phase Detector / Kamioka mine / 二相型検出器 / 神岡地下実験施設 / 液体-気体二相型検出器 / 液体キセノン検出器 |
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| Research Abstract |
We built the detector with 0.3-liter fiducial volume and measured its basic performance. We succeeded to utilize a PTFE reflector for liquid Xenon scintillation light and have been able to distinguish nuclear recoil from electron recoil using the direct scintillation and the proportional scintillation. From 2001, we started an underground experiment using a prototype detector in Kamioka mine. The background study, the radioactivity of all the materials used for this detector, was carried out using high purity Ge detector in the mine. Low background PMTs were developed by our group. The result of the prototype detector was 1 order of magnitude worse than the current limit in the WIMP-nucleon cross section. However, the origin of the radioactive source has been identified and the background level is understood quantitatively. The expected results with a 15 kg detector in the next phase will be three orders of magnitude better than the current limit.
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