Electron Antineutrino Search at the Sudbury Neutrino Observatory
Abstract
Upper limits on the flux at the Sudbury Neutrino Observatory have been set based on the charged-current reaction on deuterium. The reaction produces a positron and two neutrons in coincidence. This distinctive signature allows a search with very low background for 's from the Sun and other potential sources. Both differential and integral limits on the flux have been placed in the energy range from 4 -- 14.8 MeV. For an energy-independent e --> conversion mechanism, the integral limit on the flux of solar 's in the energy range from 4 -- 14.8 MeV is found to be <= 3.4 x 104 cm-2 s-1 (90% C.L.), which corresponds to 0.81% of the standard solar model 8B e flux of 5.05 x 106 cm-2 s-1, and is consistent with the more sensitive limit from KamLAND in the 8.3 -- 14.8 MeV range of 3.7 x 102 cm-2 s-1 (90% C.L.). In the energy range from 4 -- 8 MeV, a search for 's is conducted using coincidences in which only the two neutrons are detected. Assuming a spectrum for the neutron induced fission of naturally occurring elements, a flux limit of Phi <= 2.0 x 106 cm-2 s-1(90% C.L.) is obtained.
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