T2K sees its first event in antineutrino beam mode

T2K resumed data taking on 26 May 2014 after a 1-year shutdown caused by the hadron hall radiation accident. Many thanks are due to the J-PARC directorate and the staff members for their incredible effort over many months to make this possible! During the beamline commissioning, the first antineutrino beam at J-PARC (and the first…

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T2K Makes Discovery Magazine’s Top 100 Science Stories of 2013

T2K’s discovery of electron neutrino appearance was selected as one of the 100 top stories of 2013 in all sciences by Discover Magazine. The full list will appear in the January/February 2014 issue. “We selected the top 100 stories based in part on each item’s impact and implications on its particular field,” said the editor…

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T2K Beam Group wins 2013 Suwa Prize

The T2K Neutrino Beam group was awarded the 2013 Suwa Prize by the FAS (Foundation for High Energy Accelerator Science), for their contribution to the discovery of electron neutrino appearance by creating and operating the highest intensity neutrino beam facility. The Beam Group is responsible for design, operation, and maintenance of  equipment that monitors the…

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T2K member Atsuko Ichikawa wins the first Yuasa Prize

Prof. Atsuko Ichikawa (Kyoto University) was named the first recipient of the Yuasa Prize, for women making exceptional research achievements in science. The prize commemorates Dr. Toshiko Yuasa (1909-1980), who made significant contributions to physics while working in France at the College de France and Institut de Physique Nucléaire d’Orsay. Prof. Ichikawa was awarded the prize…

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T2K submits paper that conclusively shows muon neutrinos transform to electron neutrinos

The T2K experiment has submitted a paper to Physical Review Letters, reporting the definitive observation of electron neutrino appearance in a high-purity muon neutrino beam that travels 295 km, from the J-PARC accelerator complex to the Super-Kamiokande underground neutrino detector. A total of 28 electron neutrino events were detected, compared to 4.92 ± 0.55 background…

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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