The Hakubi Project

   In 1912, V.F. Hess discovered energetic elementary particles came from the universe, called “Cosmic Rays”. Among them, ultrahigh-energy cosmic rays (UHECRs) with energies above 10^{20} eV are the most energetic particles in the universe, Therefore, their origins are ostensibly related to extremely energetic astrophysical phenomena, such as gamma-ray bursts, active galactic nuclei, or other exotic processes such as the decay or annihilation of super-heavy relic particles created in an early phase of the development of the universe. However, their origin and acceleration mechanism above 10^{20} eV are still unknown, and are one of the most intriguing and important mysteries in particle astrophysics and astronomy. In this seminar, I will review cosmic ray physics, detection techniques, latest results, and address future perspectives.