宇宙線ミュオンによる火山体内部探索
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概要
- 論文の詳細を見る
It is well known that cosmic-ray muons are illuminating every substance on the earth. Muons arriving vertically from the sky have an intensity of one muon every square centimeter every minute with a mean energy of a few GeV. It is also well known that muons with a smaller average intensity, but with a higher intensity at energies higher than a few hundred GeV, are arriving horizontally along the earth. For the purpose of probing the internal structure of a volcano, these horizontally arriving muons can more easily be used, provided that the muon flux is reasonably high and that the size of the detection system is realistic. An improved cosmic-ray muon detection system comprising two detectors which are vertically segmented into 10 channels and horizontally segmented into 10 channels, with multiplicity cut of the soft-component background of cosmic ray was developed. The multiplicity cut method eliminates soft components by using cascade shower generation through an intermediate iron absorber. By applying to the measurement in internal structure of the volcano Mt. Asama, we clearly detected the hidden crater in the vicinity of the top. There, we proved that the volume occupancy in the region of a crater is less than 30% by comparing to the detailed Monte Carlo simulation. The future prospects of the present method is also discussed.
- 特定非営利活動法人日本火山学会の論文
- 2003-08-31
著者
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永嶺 謙忠
高エネルギー加速器研究機構(KEK)
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田中 弘幸
理研:名大
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永嶺 謙忠
高エネルギー加速器研究機構物質構造科学研究所中間子科学研究施設
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田中 宏幸
理化学研究所ミュオン科学研究室
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田中 宏幸
東大 地震研
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田中 宏幸
理化学研究所ミュオン科学研究室:(現)名古屋大学環境学研究科地球環境科学
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