A Study of Elementary Particles at Deep Underground in Kolar Gold Mines.

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Three large calorimetric type detector have been operated at great depth of 6,045 and 7,000 hg/cm^2 at the Kolar Gold Mines. The results so far obtained are as follows ;1. Angular distribution, depth-Intensity relation and Energy Spectrum of muons have been studied very precisely as fundamental quantity of the muon energy up to 250 TeV.2. Prompt Muon Production ; The zenith angular distribution of atmospheric muons have been analzsed in order to study the production of prompt muons in high energy (>50 TeV) of primary cosmic ray interactions. The present data indicates that with gamma=2.7 for muon energy of 8-250 TeV, there is prompt muon production at the level of X=(0.9<plus-minus>0.2)X10^<-3>.3. Multiple Parallel Muons ; Multiplicity, decoherence and special type of muon bundles have been examined. An unusually high multiplicity (Nmu=20) muon bundle was observed at a depth of 6,045 hg/cm^2.4. High Energy Nutrinos from Celestial Sources ; K. G. F. Nucleon decay detectors have been used to look for neutrino induced muons from celestial potential potential sources.5. Massive Long Lived Particles ; within the category of Neutrino events, there exist some special type of events which show possible evidence for the existence of long lived massive particles. Decay mode, life time and mass of particles have been examined.6. Magnetic Monopole ; A search has been made for the GUT monopole with the method of a) ionization b) progressive time delay and c) catalysis of nucleon decay.7. Nucleon Decay ; In a total exposure of 1,100 ton years, 11 candidate events for nucleon decay have been recorded. Lifetime of nucleons bounded in iron nuclei is estimated as T_N-3.1X10^<31> years.