J-PARC Main Ring upgrade approved

A new facility in J-PARC to upgrade the Main Ring accelerator is approved. This facility will house a new power supply system with which the repetition rate of the Main Ring will be doubled―resulting in 750 kW beam power for T2K, with potential to exceed 1 MW.

T2K run extension being studied

The T2K collaboration is considering the improvements in physics sensitivity, especially for CP violation, from an extension of the running time with beam power of ~1.3 MW. An Expression of Interest for the T2K extension was presented to the J-PARC PAC held  January 13-15, 2016.

Koichiro Nishikawa and members of T2K Collaboration awarded Breakthrough Prize

Dr Koichiro Nishikawa and the members of the T2K collaboration have been awarded the prestigious Breakthrough Prize for Fundamental Physics, for their role in the discovery and study of neutrino oscillation. The prize, presented by the Breakthrough Prize Foundation, was awarded “for the fundamental discovery of neutrino oscillations, revealing a new frontier beyond, and possibly…

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Takaaki Kajita wins 2015 Nobel prize in physics

The  Royal Swedish Academy of Sciences has announced that T2K collaboration member Takaaki Kajita will be awarded the 2015 Nobel prize in physics.  Prof Kajita, Director of  The Institute for Cosmic Ray Research (ICRR), University of Tokyo, shares the award with  Prof  Arthur McDonald  (Queen’s University, CA) “for the discovery of neutrino oscillations, which shows that neutrinos…

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First look at antineutrino appearance from T2K

T2K observes three candidate electron antineutrino events at Super-Kamiokande in the muon antineutrino beam from J-PARC The predominance of matter over antimatter in the universe points directly to the existence of some currently hidden laws of physics which are different for matter and anti-matter.  One focus of the search for these new laws is the…

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Watch a video about T2K

The T2K Experiment

T2K is a neutrino experiment designed to investigate how neutrinos change from one flavour to another as they travel (neutrino oscillations). An intense beam of muon neutrinos is generated at the J-PARC nuclear physics site on the East coast of Japan and directed across the country to the Super-Kamiokande neutrino detector in the mountains of western Japan. The beam is measured once before it leaves the J-PARC site, using the near detector ND280, and again at Super-K: the change in the measured intensity and composition of the beam is used to provide information on the properties of neutrinos.

Map showing J-PARC and Super-K

Science Goals of T2K

  • the discovery of νμ → νe ( i.e. the confirmation that θ13 > 0 )
  • precision measurements of oscillation parameters in νμ disappearance
  • a search for sterile components in νμ disappearance by observation of neutral-current events
  • world-leading contributions to neutrino-nucleus cross-section measurements