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 ktons yr. 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 × 104 cm-2 s-1 at the 90% 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 νe component of the DSNB flux in the
neutrinoenergy range of 22.9 MeV < Eν < 36.9 MeV of 70 cm-2 s-1 is inferred at the 90% confidence level. This is an improvement by a factor of 6.5 on the previous best upper limit on the hep
neutrinoflux and by 2 orders of magnitude on the previous upper limit on the νe component of the DSNB flux.
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