Welcome to  Neutrino Research at KEK

Neutrino Group, Institute of Particle and Nuclear Studies (IPNS),  High Energy Accelerator Research Organization (KEK)  hosts the  the accelerator based long baseline neutrino experiment which provides knowledge on the neutrino mass and mixing. Currently, the T2K experiment, whose primary aim is to discover muon neutrino to electron neutrino conversion phenomenon, is being conducted. The T2K experiment has announced the discovery of above neutrino conversion phenomenon in 2013. From 2014, the T2K experiment is investigating the difference between neutrino and anti-neutrino by measuring the neutrino oscillation phenomena precisely. Our mission is producing the high intensity neutrino/anti-neutrino beam  that enables to investigate the properties of the neutrino precisely.


KEK IPNS neutrino group constructs and operating the High intensity proton accelerator facility, J-PARC, at Tokai-site with the international collaboration with other universities and research institutions. Improvement of the neutrino beam is one of the main research topic of our group.

For detail


Tokai-to-Kamioka long base-line neutrino oscillation (T2K) is investigating the property change of the neutrinos produced at J-PARC during  the 300km propagation to Super-Kamiokande. KEK IPNS  conduct T2K experiment as the host institute with ICRR, the university of Tokyo.

For Detail

Super Kamiokande

Super-Kamiokande (SK) is the water cherenkov detector using 50 kton pure water. SK can detect not only the neutrino produced at J-PARC, but also the natural neutrino produced at Sun, Super-nova, Atmosphere, etc. The search for the decay of the protons is  also performed.

For Detail

What is neutrino?

Neutrino is one of the elementary particle that compose matters. Its  electric charge is zero. Its mass is very tiny. It almost never interact with other material.  There are many unsolved questions about the neutrino.

For detail 

Future plan: Hyper-Kamiokande

There is future plan to build the water cherenkov detector that is larger than SK (Hyper-Kamiokande)  Hyper-Kamiokande aiming to conclusive results about the difference between the  neutrino and anti-neutrino.

For detail

Liquid Argon TPC development

The liquid argon time projection chamber (LArTPC) has a capability of good particle identification and good energy resolution. We perform the R&D to realize a large size of LArTPC for the ideal neutrino detector.

(Under preparation)


The NA61/SHINE experiment measures the hadron production by proton - carbon interaction at the European Organization for Nuclear Research (CERN). Its results are used to estimate the neutrino beam flux.

For detail