High-energy universe by means of sub-PeV cosmic gamma rays

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H02084
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: TAKITA MASATO 東京大学, 宇宙線研究所, 教授 (20202161)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 空気シャワー / ミューオン / 宇宙線 / ガンマ線 / チベット / 水チェレンコフ / sub-PeV / 宇宙

Outline of Final Research Achievements

The Tibet air shower array and underground water-Cherenkov muon detectors are located 4,300m in altitude, in Tibet, China. By means of the hybrid experiment, we aim at search for celestial sub-PeV gamma-ray sources with the highest sensitivity in thw world. In additoin, we will also study our universe by gamma rays and cosmic rays with energies between TeV and sub-PeV.
With the 100 m2 muon detectors, we set the most stringent upper limit on the gamma-ray flux from the Crab nebula above 0.14 PeV. Furthermore, the 4200 m2 large muon detectors started operation, accumulating data. In addition, some new knowledge on the cosmic-ray anisotropy and the interplanetary magnetic field strength is obtained, based on cosmic-ray data in the energy region from a few TeV and 1 PeV.

Free Research Field

宇宙線物理学