Overview of RCNP

A Joint Usage/Research Center with an aim to promote international collaborations
on cutting-edge research in nuclear physics as well as applied sciences,
by making the most of the uniqueness in having the largest facility on a university campus.

Research Center for Nuclear Physics (RCNP) of Osaka University is a joint research center with the largest accelerator facility on a university campus in Japan. Besides the cyclotron facility, RCNP also operates the Laser-Electron Photon facility at SPring-8 and the double-beta decay laboratory in Kamioka, both located outside the university campus. RCNP offers unique opportunities for basic science research and education. As a Joint Usage/Research Center -- Research Center of Subatomic Sciences, we promote experimental and theoretical research in subatomic physics, especially nuclear physics, through international collaborations to elucidate the fundamental laws that govern the microscopic world of one quadrillionth of a meter. In addition, beams from the accelerators are also supplied for research in material science using secondarily-generated neutrons and muons, and for medical purpose through the radioisotope productions.

Two committees, the RCNP Steering Committee and the Physics Program Advisory Committee (P-PAC), are formed to advise on matters related to management and research plans of RCNP. Both committees are made up of elected members from RCNP as well as from among physicists outside of RCNP in nuclear physics and its related fields; the latters account for more than half of the members of committees. In addition, B-PAC and Q-PAC are organized under P-PAC to evaluate proposals for experiments at the Cyclotron and Laser-Electron Photon facilities, respectively.

As a facility that promotes accelerator-based research, we strive to ensure radiation safety of all users. All matters related to safety are undertaken by the Administration for Safety, Hygiene and Radiation Control Office.

Bird-eye view of RCNP




Steering Committee

Physics Program
Advisory Committee



RCNP Calendar


History of
Nuclear Physics Research
at Osaka University


Osaka Imperial University was founded. The first president was Hantaro Nagaoka (famous for Saturnian Model of the Atom)


School of Science was founded. Hideki Yukawa got a post of lecturer.
Construction of a Cockcroft-Walton accelerator started (Masashi Kikuchi).


Dr. Hideki Yukawa published the first paper on the meson theory.
Construction of a cyclotron started (Masashi Kikuchi).


Construction of a cyclotron completed.


Construction of a van de Graaff accelerator started (Tetsuo Wakatsuki and Koji Fushimi).


Laboratory of Nuclear Studies has been founded under school of science.

History of
Research Center
for Nuclear Physics


Science Council of Japan exhorted the government to found a laboratory of nuclear physics.


Research Center for Nuclear Physics was founded as a collaboration research center of the nuclear physics community. The first director was Shotaro Yamabe.


Construction of the AVF cyclotron completed.


Collaboration research experiments started.


Cyclotron cascade project was planned.


Construction of the RING cyclotron started.


Construction of the RING cyclotron completed.


Oto Cosmo Observatory was constructed.


Laser Electron Photon beam line at SPring-8 (LEPS) was constructed.


Upgrade of the injector cyclotron completed.


Cosmo-nuclear Physics Division was inaugurated.(-2012)


Kamioka Double-beta Decay Laboratory was constructed.


RCNP was authorized as a Joint Usage/Research Center “Research Center of Subatomic Sciences”.


Laboratory of Nuclear Studies in Graduate School of Science was integrated into RCNP


Laser Electron Photon beamline II at SPring-8 (LEPS2) was constructed.

10-1 Mihogaoka, Ibaraki, Osaka 567-0047

©2015 Research Center for Nuclear Physics, Osaka University