A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory
2006
A search has been made for
neutrinosfrom the hep reaction in the Sun and from the diffuse supernova
neutrinobackground (DSNB) using data collected during the first operational phase of the
Sudbury Neutrino Observatory, with an exposure of 0.65 kilotonne-years. For the hep
neutrinosearch, two events are observed in the effective electron energy range of 14.3 MeV < Teff < 20 MeV where 3.1 background events are expected. After accounting for
neutrino oscillations, an upper limit of 2.3 x 104 cm-2s-1 at the 90 percent confidence level is inferred on the integral total flux of hep
neutrinos. For DSNB
neutrinos, no events are observed in the effective electron energy range of 21 MeV < Teff < 35 MeV and, consequently, an upper limit on the nu e component of the DSNB fluxin the
neutrinoenergy range of 22.9 MeV < E nu < 36.9 MeV of 70 cm-2-1 is inferred at the 90 percent confidence level. This is an improvement by a factor of 6.5 on the previous best upper limit on the hep
neutrinoflux and by two orders of magnitude on the previous upper limit on the nu e component of the DSNB flux.
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