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The Kolar Gold Fields (KGF), located in the Kolar district of the state of Karnataka, India, are a set of defunct gold mines known for the neutrino particle experiments and observations that took place there starting in 1960.〔 〕 The experiments ended with the closing of the mine in 1992.〔 〕 ==Initial experiments== The initial experiments that took place in ''KGF'' were related to the study of cosmic ray muons.〔 〕 KGF was chosen because the depths of its mines allowed muons to be studied in a better environment than what was possible with magnet spectrometers operated at sea-level. KGF also allowed the scientists to study the energy spectrum and angular distributions of muons even at very high energies.〔 The mines had abundance of ''Kolar rock'' whose special characteristics with respect to density and chemical composition (different from that of normal rock) were also a useful advantage in the experiments. The first experiments involving variations of muon fluxes (a measurement of muons passing through a given media) with depth was conducted by Sreekantan.〔 These were followed by experiments in 1961 by Miyake, Narasimham and Ramanamurty and sponsored by TIFR. During 1984, Naba Kumar Mondal, TIFR, and Prof. Ito, Osaka City University, Japan, performed experimental studies on proton decay and indirectly observed the scatter of muons. Murali and Balasubramaniam briefly assisted Mondal and Ito as research assistants. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Particle experiments at Kolar Gold Fields」の詳細全文を読む スポンサード リンク
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