Abstract
Hyper-Kamiokande is a proposed next-generation water Cherenkov detector. If a galactic supernova happens, it will deliver a high event rate ((105) neutrino events in total) as well as event-by-event energy information. Recent supernova simulations exhibit the Standing Accretion Shock Instability (SASI) which causes oscillations in the number flux and mean energy of neutrinos. The amplitude of these oscillations is energy-dependent, so the energy information available in Hyper-Kamiokande could be used to improve the detection prospects of these SASI oscillations. To determine whether this can be achieved in the presence of detector effects like backgrounds and finite energy uncertainty, we have started work on a detailed simulation of Hyper-Kamiokande’s response to a supernova neutrino burst.
Highlights
Hyper-Kamiokande (HK, [1]) is a proposed next-generation water Cherenkov detector consisting of two cylindrical tanks with a fiducial volume of 187 kt each
For a galactic supernova at a fiducial distance of 10 kpc, HK will detect O(105) neutrinos within 10 s. This high event rate enables HK to resolve fast time variations of the event rate, which could give us information on properties of the progenitor or on details of the supernova explosion mechanism which are currently still unclear
Overall, considering the high-energy bin instead of the total signal is advantageous if the oscillations of the mean energy detected in HK are slightly higher than those of νe in this supernova simulation [10]
Summary
Simulating fast time variations in the supernova neutrino flux in Hyper-Kamiokande. To cite this article: Jost Migenda and Hyper-Kamiokande proto-collaboration 2017 J. - Low-energy triggering for HyperKamiokande T Dealtry, G Barr, D Dewhurst et al. - Neutrino astrophysics with HyperKamiokande Takatomi Yano and Hyper-Kamiokande proto Collaboration. View the article online for updates and enhancements. This content was downloaded from IP address 143.167.29.45 on 29/03/2018 at 14:11.
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