“Rival” neutrino experiments NOvA and T2K publish first joint analysis

The T2K experiment in Japan and the NOvA experiment in the United States conducted a joint analysis and published their first results in the journal Nature. Both are long-baseline neutrino oscillation experiments using accelerators, and by leveraging their different baselines and energy conditions, they achieved precision measurements of neutrino oscillations. As a result, they succeeded…

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Professor Masayuki Nakahata Awarded Medal with Purple Ribbon

Professor Masayuki Nakahata, longtime Super-Kamiokande spokesperson and T2K collaborator, has received the prestigious Medal with Purple Ribbon, part of 2024 Autumn Honors from the government of Japan. The Medal is awarded to people who have devoted themselves to a particular field of endeavour over many years, or who have made distinguished achievements in the fields…

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T2K Experiment enters a new phase with significantly improved sensitivity for its world leading neutrino oscillation research

The T2K Collaboration has started data taking using the enhanced neutrino beam and new neutrino near-detectors from December 2023. The KEK/J-PARC center has upgraded the main ring accelerator and the neutrino beamline to increase the beam power. T2K has also upgraded its neutrino production instruments. The stable operation of neutrino beam has been successfully achieved…

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Sara Bolognesi won the 2024 CNRS silver medal

Sara Bolognesi has been awarded the 2024 silver medal of the CNRS (French National Centre for Scientific Research) in the field of nuclear and particle physics. Each year, this prestigious prize distinguishes a researcher for the originality, quality, and importance of his or her work, recognized at international level.  Dr. Bolognesi receives this award for…

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A.K.Ichikawa, the former T2K spokesperson, won the 2023 Nishina prize

A.K.Ichikawa (left), the former T2K spokesperson, won the Nishina prize in 2023 for “Constraining CP violating phase δ in neutrino oscillations“.  As stated in her citation, Ichikawa has led research in all aspects of the T2K experiment, including in the development of elements of the neutrino beamline, and her service as analysis co-coordinator and spokesperson.…

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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 search for CP violation in the neutrino sector
  • 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