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

科拉尔金矿地下深处基本粒子的研究。

• 批准号: 63044122
• 负责人: ITO Nobuo
• 金额: $ 3.84万
• 依托单位: Faculty of Science, Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63044122/
• 关键词: Great underground depth.; Cosmic rays.; Prompt muons.; Multiple muons.; Celestial Sources of neutrino.; Massive long lived particles.; Monopole.; Proton decay.

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.

在科拉尔金矿，三个大型量热型探测器在6,045和7,000 hg/cm ^2的深度下工作。到目前为止，得到的结果如下：1.角分布，深度-强度关系和μ子的能谱已经非常精确地研究了μ子能量高达250 TeV的基本量。瞬发μ介子的产生为了研究高能（>50 TeV）初级宇宙线相互作用中瞬发μ子的产生，分析了大气μ子的天顶角分布。目前的数据表明，对于8-250 TeV的μ子能量，γ =2.7，在X=（0.9 0.2）X10^ .3的水平上存在μ子的瞬发产生<plus-minus><-3>。多重平行μ子：多重性，退相干和特殊类型的μ子束进行了研究。在6，045 Hg/cm ^[2.4]的深度观测到了异常高的多重数（N μ =20）μ介子束。来自天体来源的高能中微子; G. F.核子衰变探测器已被用来寻找来自天体势源的中微子诱导μ子。大质量长寿命粒子在中微子事件的范畴内，存在着一些特殊类型的事件，它们显示了长寿命大质量粒子存在的可能证据。研究了粒子的衰变方式、寿命和质量.磁单极;用a）电离B）渐进时间延迟和c）核子衰变催化的方法对大统一理论进行了探索.核子衰变：在总共1，100吨年的照射中，记录了11个核子衰变的候选事件。束缚在铁核中的核子的寿命估计为T_N-3.1 × 10 ~ <31>5年。

项目成果

H.Adarkar et al.: "Search for HighーEnergy Neutrinos from SN1987A in KGF Nucleon Decay Experiments" Journal of Astrophysics and Astronomy. 11. 73-79 (1990)

H.Adarkar 等人：“在 KGF 核子衰变实验中搜索 SN1987A 的高能中微子”《天体物理学与天文学杂志》11. 73-79 (1990)。

H. Adarkar et al.: "High Multiplicity Muon Bundles Observed at Great Depth Underground" Proceedings of Astrophysical Aspects of the Most Energitic Cosmic Rays.

H. Adarkar 等人：“在地下深处观察到的高多重性 μ 介子束”最高能量宇宙射线天体物理学方面的论文集。

H.Adarkar et al.: "Search for High Energy Neutrinos from Celestial Sources at Kolar Gold fields" Proceedings of 21st International Cosmic Ray Conference. 10. 21-24 (1990)

H.Adarkar 等人：“在科拉尔金矿区从天体中寻找高能中微子”第 21 届国际宇宙射线会议论文集。

H. Adarkar et al.: "Study of Prompt Muon Production by Angular Distribution of Muons Recorded in KGF Nucleon Decay Experiment" Proceedings of 21st International Cosmic Ray Conference. 9. 310-313 (1990)

H. Adarkar 等人：“KGF 核子衰变实验中记录的 μ 子角分布对即时 μ 子产生的研究”第 21 届国际宇宙射线会议论文集。

H.Adarkar et al.: "Instrumentation of KGF Nucleon Decay Experiment" Indian Journal of Pure and Applied Physics. 27. 679-690 (1989)

H.Adarkar 等人：“KGF 核子衰变实验的仪器”印度纯粹与应用物理学杂志。