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

在Kolar金矿的6 045和7 000汞柱/厘米^2的深度下使用了三个大型量热式探测器。目前得到的研究结果如下：1。对介子的角分布、深度-强度关系和能谱进行了非常精确的研究，作为高达250 TeV.2的介子能量的基本量。提示子产生；本文分析了大气中介子的天顶角分布，以研究高能（bbb50 TeV）初宇宙线相互作用下瞬发介子的产生。目前的数据表明，当γ =2.7时，μ子能量为8-250 TeV，在X=(0.9<正负>0.2)X10^<-3>.3的水平上产生μ子。多平行μ子；研究了多重性、退相干性和特殊类型的介子束。在6045 hg/cm^2.4深度处观察到异常高的μ子束多重性（Nmu=20）。来自天体的高能中微子核子衰变探测器已经被用来寻找来自天体势能源的中微子诱导的介子。大质量长寿命粒子；在中微子事件的范畴内，存在一些特殊类型的事件，这些事件可能表明存在长寿的大质量粒子。研究了粒子的衰变模式、寿命和质量。磁单极子；用A)电离b)渐进时间延迟和c)催化核子衰变的方法对GUT单极子进行了搜索。核子衰变；在1100吨年的总暴露中，记录了11个候选的核子衰变事件。核子在铁核中的寿命估计为T_N-3.1X10^<31>年。

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.