Abstract
Several current projects aim at building a large water Cherenkov detector, with a fiducialvolume about 20 times larger than in the current Super-Kamiokande experiment.These projects include the Underground nucleon decay and Neutrino Observatory(UNO) in the Henderson Mine (Colorado), the Hyper-Kamiokande (HK) detectorin the Tochibora Mine (Japan) and the MEgaton class PHYSics (MEMPHYS)detector at the Fréjus site (Europe). We study the physics potential of a referencenext-generation detector (0.4 Mton of fiducial mass) in providing informationon supernova neutrino flavour transitions with unprecedented statistics. Afterdiscussing the ingredients of our calculations, we compute neutrino event ratesfrom inverse beta decay (), elastic scattering on electrons and scattering on oxygen, with emphasis on theirtime spectra, which may encode combined information on neutrino oscillationparameters and on supernova forward (and possibly reverse) shock waves. Inparticular, we show that an appropriate ratio of low to high energy events canfaithfully monitor the time evolution of the neutrino crossing probability alongthe shock wave profile. We also discuss some background issues related to thedetection of supernova relic neutrinos, with and without the addition of gadolinium.
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