| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Some of particle detectors used in elementary particle experiments detect particles by sensing feeble light such as scintillation light generated by charged particles passing through matter. We carried out the experiments to evaluate the abilities for feeble light detection of some semiconductor photosensors including avalanche photodiodes and multi-pixel photon counters(MPPCs) selected as photosensor candidates for the partilce detectors. As a result, we found that the MPPC was the most sensitive. In particular, the MPPC cooled down to -40 degrees centigrade could detect with almost 100% efficiency the quite feeble light pulse which contained only 7 photons. The photomultiplier tubes, which have usually been used in particle detectors, can never achieve such high detection efficiency for such a feeble light pulse.
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