J-PARC delivers 2.0e21 protons on target

On March 2, the number of protons delivered to the neutrino target of the T2K experiment by the J-PARC accelerator reached an important milestone: 2×10^21 accumulated since January 2010.  Many thanks are due to the J-PARC directorate and the staff members for their outstanding work to make this possible ! The protons are produced by the J-PARC…

Read More

Koichiro Nishikawa wins 2016 Pontecorvo Prize

Professor Koichiro Nishikawa has been awarded the Bruno Pontecorvo Prize for the year 2016. The Bruno Pontecorvo Prize is awarded by the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, for elementary particle physics. The prize commemorates Prof. Bruno Pontecorvo, a pioneering neutrino physicist who worked for many decades at JINR. The Prize was…

Read More

T2K Near Detector Upgrade

On February 11, 2017, the T2K Collaboration launched its Near Detector Upgrade project. The upgrade is targeted at reducing systematic errors in T2K’s search for CP violation in the neutrino sector. The current conceptual design will be developed into a technical design, leading to a full proposal, by the end of 2017. The collaboration aims…

Read More

T2K CP violation search results presented at ICHEP 2016

The international T2K Collaboration announced today their findings on the symmetry between neutrino and antineutrino oscillation. With nearly twice the antineutrino data in 2016 compared to their initial results using antineutrino data in 2015, T2K has performed a new analysis of all data, fitting both neutrino and antineutrino modes simultaneously. Today’s announcement was made by…

Read More

T2K presents first CP violation search result

New data support growing hint of different oscillation probabilities for neutrinos and antineutrinos The T2K Collaboration presented new results on neutrino and antineutrino oscillations at the 27th International Conference on Neutrino Physics and Astrophysics (Neutrino 2016) at Imperial College London.  T2K’s new data continue to prefer maximal mixing in the atmospheric angle (θ23), a value…

Read More

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