|From the Director|
|#of Staff & Directors|
|1950||Asahi Hut (wooden structure; about 50 sq. meters) was constructed on Mt. Norikura based on the Asahi Bounty for Science.|
|Showa 28||1953||Asahi Hut was incorporated into the Cosmic Ray Observatory, the University of Tokyo (Aug. 1).|
|Showa 30||1955||The main building and research facilities of the Norikura Observatory were constructed (the opening ceremony was held on Aug. 29).|
|Showa 31||1956||-- The Cosmic Ray Division (composed of Air Shower Section and Emulsion Section) was inaugurated at the Institute for Nuclear Study, the University of Tokyo.|
|Showa 32||1957||The Norikura Observatory participated in IGY (International Geophysical Year) activities, and began air shower observation.|
|Showa 33||1958||The emulsion chambers at Norikura Observatory started operation.|
|Showa 34||1959||-- Air shower observation started at the Institute for Nuclear Study, the University of Tokyo.|
|Showa 35||1960||-- The Emulsion Section of the Institute for Nuclear Study, the University of Tokyo, developed a large-size balloon.|
-- International projects of the Japan Society for the Promotion of Science started (international collaboration with India, Brazil and Bolivia).
|Showa 41||1966||-- The balloon project of Emulsion group of Institute for Nuclear Study, the University of Tokyo, was transferred to the Institute of Space and Aeronautical Science, the University of Tokyo.|
|Showa 43||1968||-- The Emulsion Section of the Institute for Nuclear Study, the University of Tokyo, started observation on Mt. Fuji with emulsion chambers.|
|Showa 47||1972||A full-time director was appointed.|
The construction of MUTRON was commenced.
-- The cosmic material research section was established in the Cosmic Ray Division of the Institute for Nuclear Study.
|Showa 48||1973||The ultra-high energy weak-interation division was newly established. |
The international projects of the Japan Society for the Promotion of Science (with India, Brazil and Bolivia) were incorporated.
|Showa 49||1974||A full-time chief administrator was appointed.|
|Showa 50||1975||MUTRON was completed. |
The construction of the Akeno Observatory started.
The ultra-high energy strong-interaction division was newly established.
|Showa 51||1976||In the wake of the amendment of the National School Establishment Law, the observatory was reorganized into the Institute for Cosmic Ray Research (ICRR) (25 Aug); The ultra-high energy strong-interation division was divided into two divisions, and the three divisions of the Institute for Nuclear Study, the University of Tokyo (muon measurement, experimental meson physics and cosmic ray study) were transferred to ICRR. As the result, ICRR started out with 6 divisions and 1 observatory.|
|Showa 52||1977||The Akeno observatory was established as one of the ICRR facilities (18 Apr).|
|Showa 53||1978||The Akeno Observatory performed the opening ceremony (6 Oct).|
|Showa 54||1979||The Akeno 1km2 air shower detector was completed.|
The special facility for emulsion chamber on Mt. Fuji was constructed.
The 16th International Cosmic Ray Conference was held in Kyoto (Aug).
|Showa 56||1981||Japan-China joint research on emulsion chamber observations started.|
|Showa 57||1982||The cosmic ray detection division (for guest researchers) was newly established.|
|Showa 58||1983||The nucleon decay experiment started in the Kamioka Mine as a collaborative research project. |
The primary cosmic ray research facility (i.e. mass spectrometer etc.) was installed.
|Showa 61||1986||The first committee for future projects was organized.|
|Showa 62||1987||The underground detector at Kamioka observed a neutrino burst from a supernova for the first time in history. |
The construction of the 100km2 wide-area air shower detector, AGASA, started at the Akeno Observatory.
The first committee for future project submitted an evaluation report.
|Showa 63||1988||The underground detector at Kamioka observed a deficit in solar neutrino flux.|
|Heisei 01||1989||A significant increase of cosmic ray intensity coincident with a solar flare was observed at the Norikura Observatory (29 Sep).|
The 100km2 wide area air shower detector, AGASA, was completed at Akeno.
|Heisei 03||1991||The construction of Super-Kamiokande was commenced. |
The second committee for future projects was organized.
|Heisei 04||1992||The neutrino astrophysics division was newly established, and the cosmic ray detection division (for guest researchers) was discontinued. |
The gravitational wave group joined in muon measurement division at ICRR.
The Cangaroo project started in Australia
The Cangaroo observed TeV gamma rays from a pulsar (PSR1706-44).
|Heisei 05||1993||The construction of air shower gamma ray detector in Tibet started.|
|Heisei 06||1994||A computer center was built at Kamioka Observatory (Jan). |
The excavation for SuperKamiokande was completed (Jun).
A giant air shower with energy of 2×1020 eV was observed at Akeno
An external evaluation of ICRR was conducted.
The anormalous zenith angle dependence of the atmospheric neutrinos was observed at Kamioka.
|Heisei 07||1995||The neutrino astrophysics division was discontinued, and the Kamioka Observatory for Cosmic Elementary Particle Research was established (1 Apr) |
The completion ceremony of Super-Kamiokande was held before filling water (Nov).
|Heisei 08||1996||The full-scale operation of Super-Kamiokande began (1 Apr).|
|Heisei 09||1997||The air shower gamma ray detector in Tibet was completed.|
|Heisei 10||1998||The Super-Kamiokande collaboration officially announced the discovery of none-zero neutrino mass (5 Jun). |
The construction of the Kashiwa Campus was commenced (Nov).
|Heisei 11||1999||The Research Center for Cosmic Neutrinos was established (1 Apr). |
The Cangaroo-2 began operation in Australia.
Preparation of the Cangaroo-3 began in Australia.
|Heisei 12||2000||ICRR moved to the new Kashiwa Campus (Feb.-Mar.).|
|Heisei 13||2001||An accident occurred at the Super-Kamiokande, destroying more than half of the photomultipliers (Nov.).|
|Heisei 14||2002||Professor Emeritus Masatoshi Koshiba won the Novel Prize in Physics for his pioneering contributions to the detection of cosmic neutrinos, based on outcomes of the Kamiokande experiment (Dec.). |
The Super-Kamiokande was partially restored, and observation resumed (Dec.).
|Heisei 15||2003||The 28th International Cosmic Ray Conference was held in Tsukuba (Aug.).
The construction of the Telescope Array was commenced.
Four telescopes for the Cangaroo-3 Project were completed.
|Heisei 16||2004||Japanese national universities became independent administrative agencies (Apr.1).
The research divisions of ICRR were reorganized into the three divisions: Neutrino and Astroparticle Division, High Energy Cosmic Ray Division, and Astrophysics and Gravity Division (Apr.1).
|Heisei 18||2006||The restoration of the Super-Kamiokande was completed.|
|Heisei 19||2007||The Committee on Future Projects III was established.
The Committee on Future Projects III submitted its report.
|Heisei 20||2008||The Telescope Array experiment started observation.|
The Super-Kamiokande detected the first neutrino from the T2K experiment.
|Heisei 23||2011||The Gravitational Wave Project Office was established (Apr. 1).
The T2K experiment caught a sign of electron neutrino appearance (Jun. 15).
The Committee on Future Projects IV was established.
|Heisei 24||2012||The Cangaroo experiment ended its operation.|
|Heisei 26||2014||The excavation of KAGRA tunnel was completed (Jul.).|