| Project/Area Number |
07640409
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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 | KOBE UNIVERSITY |
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Principal Investigator |
EBISU Takeo KOBE UNIVERSITY,DEPARTMENT OF PHYSICS,ASSISTANT, 理学部, 助手 (50090543)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Tadashi TOKYO UNIVERSITY OF INFORMATION SCIENCES,DEPARTMENT OF INFORMATION SYSTEMS,PROFE, 経営情報学部, 教授 (20030786)
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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 |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Superheated superconducting granule / Cryogenic particle detector / Flip-flop phenomenon / Local heating / Global heating |
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| Research Abstract |
We have carried out a project of measuring a deposit energy through the flip-flop process using a superheated superconducting tin micro granule. Conclusions obtained from experiments are as follows.
1. It was confirmed that the flip signals in the tin used become smaller and smaller to disappear at critical external magnetic field determined from the critical superconducting field Hc. This fact is theoretically explained by considering that the magnetization curves demonstrate the existence of an intermediate state.
Therefore such material as obeying the local-heating picture is unsuitable because of the decrease and disappearance of flip signals induced by alpha-rays.
Another candidate material for the manifestation of the effect is aluminum as obeying the global-heating picture.
2. From the analysis of angular dependence of the bombardment by alpha-rays, the granule is magnetized not in a pinpoint but such as the small portion is warmed. Then, there still remains a possibility for the flip-flop effect to appear in tin granules much smaller than 20mum in diameter, in which the difference of the two heating processes diminishes.
Second conclusion was confirmed in the experiment using a tin granule of 11mum in diameter carried out by Bern university.
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