Cooperative Study on Non-Accelerator Physics between Japan and Italy(LVD+LMD)project

• Project/Area Number: 02044025
• Research Category: Grant-in-Aid for international Scientific Research
• Allocation Type: Single-year Grants
• Section: Joint Research
• Research Institution: Saitama University
• Principal Investigator: MISAKI Akeo Associate professor, Department of Physics, Saitama University, 理学部, 助教授 (20008816)
• Co-Investigator(Kenkyū-buntansha): SAITO Katsuhiko Lecturer, Ashikaga Institute of Technology, 講師 (30118434) ; W. FULGIONE イタリア国立研究会議, 宇宙地球物理研究所, 助手 ; M. AGLIETTA イタリア国立研究会議, 宇宙地球物理研究所, 助手 ; P. GALEOTTI イタリア国立研究会議, 宇宙地球物理研究所, 教授 ; O. SAAVEDRA トリノ大学, 物理学研究所, 教授 ; C. CASTAGNOL イタリア国立研究会議, 宇宙地球物理研究所, 教授 ; KUGA Kiyoshi Graduate Student, Graduate Course, Okayama University of Science, 大学院工学研究科, 博士課程2年 ; NAKAGAWA Masuo Lecturer, Okayama University of Science, 理学部, 講師 (70148683) ; MINORIKAWA Yukio Associate Professor, Department Physics and Mathematics, Kinki University, 理工学部, 助教授 (90088500) ; TAKAHASHI Nobusuke Lecturer, Faculty of General Education, Hirosaki University, 教養部, 講師 (40216742) ; KAWAGUCHI Setsuo Professor, Faculty of General Education, Hirosaki University, 教養部, 教授 (30013395) ; WADA Tomonori Associate Professor, Department of Physics, Okayama University, 理学部, 助教授 (10033200) ; INOUE Naoya Research Assistant, Department of Physics, Saitama University, 理学部, 助手 (40168456) ; GALEOTTI Piero Professor, Institute of Cosmogeophysics, National Council of Council ; CASTAGNOLI Carlo Director, Institute of Cosmogeophysics, National Council of Research ; FULGIONE Walter Research Assistant, Institute of Cosmogeophysics, National Council of Research ; AGLIETTA Marco Research Assistance, Institute of Cosmogeophysics, National Council of Research ; SAAVEDRA Oscar Department of General Ohysics, University of Turin ; FULGIONE W. イタリア国立研究会議, 宇宙地球物理研究所, 助手 ; BADINO G. イタリア国立研究会議, 宇宙地球物理研究所, 助手 ; SAAVEDRA O. トリノ大学, 物理学研究所, 教授 ; AGLIETTA M. イタリア国立研究会議, 宇宙地球物理研究所, 助手 ; CASTAGNOLI C イタリア国立研究会議, 宇宙地球物理研究所, 教授 ; 原 忠夫 東京大学, 宇宙線研究所, 助手 (60013413) ; 北村 崇 近畿大学, 理工総合研究所, 教授 (10013426)
• Project Period (FY): 1990 – 1992
• Project Status: Completed (Fiscal Year 1992)
• Budget Amount: ¥26,000,000 (Direct Cost: ¥26,000,000); Fiscal Year 1992: ¥9,000,000 (Direct Cost: ¥9,000,000); Fiscal Year 1991: ¥10,000,000 (Direct Cost: ¥10,000,000); Fiscal Year 1990: ¥7,000,000 (Direct Cost: ¥7,000,000)
• Keywords: Cosmic neutrinos / Large Volume Detector (LVD) / the Gran Sasso Laboratory / a combined telescope of the EAS-TOP and LVD / steller collapse signals / the underground laboratory at Mont Blanc / TL-sheet stacks / a slow GUT monopole / 非加速器物理 / グランサッソ-地下実験所 / 超重粒子 / 液体シンチレ-ション検出器 / TLシ-ト / 超高エネルギ-カスケ-ド計算 / 液体シンチレ-タ-検出器 / ストリ-マ-検出器 / TLスタック / 低背景放射線 / 低速・超重粒子の検出

Research Abstract

1.The Large Volume Detector (LVD) in the Gran Sasso underground Laborato is a multipurpose detector consisting of a large volume of liquid scintillator interleaved with limited streamer tubes in a compact 3-dimensional geometry. A major purpose of the LVD neutrino observatory is to search for stellar collapses. The detector has a modular structure composed of 190 modules arranged in 5 towers. Each modules has 8 scintillation counters surrounded by an L-shaped tracking system. The total mass is 1840 tons of scintillator and the dimensions are 40mX12mX13m. Presently the first tower is taking data and the second is under construction. The first tower (368 tons) was turned on in June 1992. This mass of liquid scintillator makes the first LDV tower one of the largest supernovae neutrino observatories in the world and the largest one based on liquid scintillator.
The LVD group presented the power of LVD to study low-energy neutrinos, the results of a search for steller collapse signals during this initial period and the first results of the combined measurements of the EAS-TOP (at the surface) and LVD (deep underground) detectors operating as a combined telescope in study of UHE cosmic rays and their interactions. As examples, different classes of events and their significance in different high-energy and astrophysical were studied.
2.A thermoluminescent sheet and its readout system hava been developed for the detection of supper-slow massive particles. The TL-sheet stacks of the 50m^2 were set Mont Blanc tunnel for two years. The X-ray films of 17m^2・year were analyzed. Two candidates were found and one result of their TL-sheet read-outs corresponds that of a slow GUT monopole (beta=10^<-4>).

Research Products

• [Publications] M.AGLIETTA: "The Most Powerful Scintillator Supernovae Detector:LVD" I1 Nuovo Cimento. 105. 1793-1804 (1992)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] M.AGLIETTA: "First Observation of High-Energy Cosmic-Ray Events Obtained in Coincidence between EAS-TOP and LVD at Gran Sasso" I1 Nuovo Cimento. 105. 1815-1823 (1992)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] M.AGLIETTA: "Search for Heavy Slowly Particles at the Mt.Blanc Laboratory with TL-Stack Detector" Proc. of 23rd Int. Cosmic Ray Conf.(1993)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] M. Aglietta: "The Most Powerful Scintillator Supernovae Detector : LVD" Il Nuovo Cimento. 105. 1793-1804 (1992)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] M. Aglietta: "First Observation of High Energy Cosmic Ray Events Obtained in Coincidence between EAS-TOP and LVD at Gran Sasso" Il Nuovo Cimento. 105. 1815-1823 (1992)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] M. Aglietta: "Seracr for Heavy Slowly Particles at the Mt. Blanc Laboratory with TL-Stack Detector." Proc. of 23rd Int. Cosmic Ray Conf.(1993)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] M.Aglietta et al.: "Search for Super-slow Massive Particles with TL Sheets at the Mont Blanc Laboratory" Proc.of 22nd International Cosmic Ray Conf.4. 710-713 (1991)
• [Publications] M.Aglietta et al.: "Test Experiment to Detect Super-slow Massive Particles with TL Sheets st Mont Blanc Laboratory" Proc.of 22nd International Cosmic Ray Conf.4. 714-717 (1991)
• [Publications] N.Inoue el al: "THE K^, RECOGNITION WITH LARGE VOLUME LIQUID SCINTILLATION COUNTER" Nuclear Physics B. 14B. 217-222 (1990)
• [Publications] T.Wada et al: "Recewnt Readout Techniques of Thermoluminescence Sheet" Proceeding of 21st International Conference on Cosmic Rays. 10. 187-191 (1990)
• [Publications] T.Wada et al: "Detecting SuperーHeavy,Super Slow Particles with TL Sheets" Proceeding of 21st International Conference on Cosmic Rays. 10. 91-94 (1990)
• [Publications] A.Misaki: "A study of Electromagnetic Cascade Shower with the LPM Effect in Water for the Detection of Extremely High Energy Neutrinos" Fortschritte der Physik. 38. 413-446 (1990)
• [Publications] E.Lonishi et al: "ON THE CHARACTERISTICS OF INDIVIDUAL CASCADE SHOWERS WITH THE LPM EFFECT IN EXTREMELY HIGH ENERGY" Journal of Physics G:Nuclear and Particle Physics. 229ー90ー22. 1-27 (1990)
• [Publications] T.Kitamura and T.Nakatsuka: "Comments on the super kamiokande project (nextーgeneration underground facility at Kamioka)" I1 Nouvo Cimento. 103A. 1443-1466 (1990)