The Hyper-Kamiokande (Hyper-K) experiment is the next generation flagship experiment for the study of neutrino oscillations, nucleon decays, and astrophysical neutrinos. It is one of the 27 large projects selected by the Japanese Science Council. The Hyper-K collaboration currently consists of institutes from 13 countries in 3 different continents. The detector is a third generation underground water Cherenkov (WC) detector situated in Kamioka, Japan. It consists of a 1 million tonne water target which is about 20 times larger than that of the existing Super-Kamiokande (Super-K) detector. It will serve as the far detector for a long baseline neutrino oscillation experiment (previously called T2HK) planned for the upgraded J-PARC beam. It will also serve as a detector capable of observing proton decays, atmospheric neutrinos, and neutrinos from astronomical origins enabling measurements that far exceed the current world best measurements. Hyper-K has a sensitivity to the mass hierarchy through the atmospheric neutrino measurements and will be able to make a definitive measurement.
Hyper-Kamiokande in the UK
The HyperK-UK consortium consists of the Universities of Edinburgh, Imperial College, Lancaster, Liverpool, Oxford, Queen Mary, Royal Holloway, Sheffield and Warwick together with RAL. The intended UK contributions to Hyper-K include:
- sensitivity studies and software infrastructure;
- detector R&D;
- a gadolinium-loaded water Cherenkov near detector, TITUS;
- an improved DAQ system;
- development of a calibration system;
- secondary beamline R&D.
These build directly on the UK's contribution to the T2K experiment and will give the UK a high profile in Hyper-K.
The Sheffield group is contributing primarily to calibration, software infrastructure, and sensitivity studies.