Currently, we are developing CALET (Calorimetric Electron Telescope) in collaboration with JAXA. CALET is an experiment by an international team (Japan, US, and Italy) to be installed on the International Space Station (ISS). CALET enables us to observe the high-energy cosmic rays and study unknown astrophysical particle-acceleration sites, dark matter, and other mysteries in the universe.
We are also participating in the LHCf (Large Hadron Collider forward) experiment at CERN, which uses forward particles created inside the LHC as a source to simulate cosmic rays, Tibet ASγ, which is an experiment to detect very high-energy cosmic rays with the 36900-m2detector array built at Yangbajain, Tibet.
For the 100 years since its discovery, the cosmic ray has been one of the hottest topics in experimental physics. Many discoveries in the field, such as positron, μ-on, neutrinos from a supernova, have significantly contributed to our knowledge on the universe, although We still do not know the fundamentals of cosmic ray, such as the acceleration site and acceleration mechanism, the highest energy, etc. Even the problem of the dark matter might be solved by the study of cosmic ray.
We are exploring the nature of the cosmic ray by experiments both on the ground and in the space.
Waseda University, Faculty of Science and Engineering
Waseda Institute for Space Science Observation System
Prof. Shoji Torii