| Project/Area Number |
07640368
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | TOHOKU UNIVERSITY |
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Principal Investigator |
YUTA Haruo Faculty of Science, TOHOKU UNIVERSITY Professor, 大学院・理学研究科, 教授 (90108457)
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| Co-Investigator(Kenkyū-buntansha) |
HASEGAWA Takuya Faculty of Science, TOHOKU UNIVERSITY Research Physicist, 理学部, 助手 (40261549)
NAGAMINE Tadashi Faculty of Science, TOHOKU UNIVERSITY Research Physicist, 大学院・理学研究科, 助手 (30212111)
SUEKANE Fumihiko Faculty of Science, TOHOKU UNIVERSITY Associate Professor, 大学院・理学研究科, 助教授 (10196678)
SUZUKI Atsuto Faculty of Science, TOHOKU UNIVERSITY Professor, 理学部, 教授 (00100818)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Liquid Scintillator / Particle Detector / Neutrino / Absorption Length / シンチレータ吸収計数 / シンチレータ / 粒子検出器 / 素粒子 / 宇宙ニュートリノ / 宇宙線 / 陽子 / 電子 |
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| Research Abstract |
This study aims to measure the basic properties of liquid scintillator for a large liquid scintillator detector, which Tohoku university group is planning to build for studying the neutrino oscillation. To build such a detector, we need a large amount of the very expensive liquid scintillation. Oneway to reduce the cost of the detector is to dilute the scintillator with solvent such as mineral oil. However, no information for the properties of such a mixed liquid scintillator. Thus, we made a test detector of 2.5cm*7cm phi to measure the absorption length of the liquid scintillator with two phototubes. We use NE224 and 0.976MeV conversion electrons from ^<207>Bi for this test.
The test detector was designed to avoid the light reflection from the tube wall by putting shielding rings. After examining the stability of the phototubes, we obtained the absorption length (mu) of NE224
mu=5.8(]SY.+-。[)0.9m.
Since no information is available for the absorption length of NE224, we repeated the measurements and found that the measured values are consistent with each other.
For mixing mineral oil to liquid scintillator, we need to study and establish the mixing method before measuring the absorption length of mixture. Finally, we thank the Ministry of Education, Science, Sports and Culture that we could establish the method of measuring absorption length of liquid scintillator through this Grant-in-Aid.
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