| Project/Area Number |
10041128
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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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 | High Energy Accelerator Research Organization |
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Principal Investigator |
MAKI Akihiro Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Professor, 素粒子原子核研究所, 教授 (40044755)
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| Co-Investigator(Kenkyū-buntansha) |
HARUYAMA Tomiyoshi Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Associate Professor, 素粒子原子核研究所, 助教授 (90181031)
SUGIMOTO Yasuhiro Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Research Associate, 素粒子原子核研究所, 助手 (70196757)
KUNO Yoshitaka Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Associate Professor, 素粒子原子核研究所, 教授 (30170020)
長坂 康史 長崎総合大学, 工学部, 助手 (20299655)
新井 康夫 高エネルギー加速器研究機構, 素粒子原子核研究所, 助手 (90167990)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Lepton flavor violation / Muon decay / Liquid xenon / scintillation calorimeter / Pulse tube refrigerator / レプトンフレーバー / 超対称性理論 / 大統一理論 / ミューオン / 液体キセノン・シンチレーション・カロリメータ / レプトンフレーバーの破れ / μ-e^+γ崩壊 |
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| Research Abstract |
An experiment was designed to improve and identify a lepton flavor number violating decay process, a muon decay into a positron and a photon. The process is severely prohibited by the standard model of the elementary particle, and the identification of the process gives us a signal of the new world of the particle physics, beyond the standard model.
The concept of the experiment is based on two innovative ideas, liquid xenon scintillation calorimeter for measuring energy, position and timing of photons and COBRA spectrometer for measuring momentum of positrons.
Several development programs have been carried out to made the above experiment possible. Firstly, a new phtomultiplier tube was developed to detect the scintillation photons(wavelength of 175 nm) from liquid xenon at the low temperature of -100℃. A small test calorimeter with 32 photomultiplier tubes was built and used to confirm the expected performances of the liquid xenon calorimeter. Secondly, a pulse tube refrigerator was developed to directly liquefy the large amount of xenon gas.
Together with other studies, and experimental proposal was written and submitted to Paul Sherrer Institute, Switzerland in May 1999. The proposal was accepted in July, 1999 by the Institute. Currently, further details are being studied.
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