22 Feb 2011





Aerial view of J-PARC (Tokai, Ibaraki, Japan)


J-PARC (link opens in a new window) (Japan Proton Accelerator Research Complex) accelerates protons to 50GeV. These then collide with a target producing pions, which decay to muons, which subsequently decay to muon neutrinos. The beam, 0.75 MW, is directed slightly away from the Super-Kamiokande detector so that the flux of the neutrinos is lowered, providing a more useful neutrino energy spectrum. Off-axis the highest energy levels are low. This is useful as at the distance between Tokai and Kamioka, maximal neutrino oscillation is predicted to occur at energies lower than 1GeV.

Contact: Stewart, Trevor (STFC,RAL,PPD)