Hyper-Kamiokande

Hyper-Kamiokande (also called Hyper-K or HK) is a neutrino observatory and experiment under construction in Hida, Gifu and in Tokai, Ibaraki in Japan.

It is conducted by the University of Tokyo and the High Energy Accelerator Research Organization (KEK), in collaboration with institutes from over 20 countries across six continents.

After 10 years of data taking, HK is expected to confirm at the 5σ confidence level or better if CP symmetry is violated in the neutrino oscillations for 57% of possible δCP values.

Time profiles of the number of events registered in HK and their mean energy would enable testing models of the explosion.

With ten years of data taking, HK is expected to detect about 40 SRN events in the energy range 16–30 MeV.

Hyper-Kamiokande geoneutrino studies will help assess the Earth's core chemical composition, which is connected with the generation of the geomagnetic field.

[3]: 292–293 The decay of a free proton into lighter subatomic particles has never been observed, but it is predicted by some grand unified theories (GUT) and results from baryon number (B) violation.

The main channels studied by HK are p+ → e+ + π0 which is favoured by many GUT models and p+ → ν + K+ predicted by theories including supersymmetry.

[13] The Intermediate Water Cherenkov Detector (IWCD) will be located at a distance of around 750 metres (2,460 ft) from the neutrino production place.

These two facts, independence from the neutrino interaction and detector response models, will enable HK to minimise systematic error in the oscillation analysis.

[18][19] In the ID, there will be at least 20,000 50 centimetres (20 in) diameter PhotoMultiplier Tubes (PMT) of R12860 type by Hamamatsu Photonics and approximately 800 multi-PMT modules (mPMTs).

The OD will be instrumented with at least 3,600 8 centimetres (3.1 in) diameter PMTs coupled with 0.6×30×30 cm3 wavelength shifting (WLS) plates (plates will collect incident photons and transport them to their coupled PMT) and will serve as a veto[note 3] to distinguish interactions occurring inside from particles entering from the outside of the detector (mainly cosmic-ray muons).