Search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory

Abstract

A search has been performed for neutrinos from two sources, the $hep$ reaction in the solar $pp$ fusion chain and the ${\nu }_e$ component of the diffuse supernova neutrino background (DSNB), using the full dataset of the Sudbury Neutrino Observatory with a total exposure of 2.47 kton-years after fiducialization. The $hep$ search is performed using both a single-bin counting analysis and a likelihood fit. We find a best-fit flux that is compatible with solar model predictions while remaining consistent with zero flux, and set a one-sided upper limit of ${\Phi }_{hep}<30\times 10^3{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$ [90% credible interval (CI)]. No events are observed in the DSNB search region, and we set an improved upper bound on the ${\nu }_e$ component of the DSNB flux of ${\Phi }_{{\nu }_e}^{\mathrm{DSNB}}<19{\text{cm}}^{-2}{\text{s}}^{-1}$ (90% CI) in the energy range $22.9<E_{\nu }<36.9$~MeV.

arXiv comment11 pages, 6 figures

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