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A search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory
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Resumo(s)
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. 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 $\Phi_{hep} <
30\times10^{3}~\mathrm{cm}^{-2}~\mathrm{s}^{-1}$ (90% credible interval). No
events are observed in the DSNB search region, and we also set an improved
upper bound on the $\nu_e$ component of the DSNB flux.