OMNIS-an improved low-cost detector to measure mass and mixing of mu/tau neutrinos from a Galactic supernova

Details OMNIS-an improved low-cost detector to measure mass and mixing of mu/tau neutrinos from a Galactic supernova OMNIS-an improved low-cost detector to measure mass and mixing of mu/tau neutrinos from a Galactic supernova

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aph.....8...27s&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 8, Issue 1-2, p. 27-42.

Physics

34

Scientific paper

OMNIS is an observatory for multiflavour interactions from Galactic supernovae. It has evolved from the Supernova Neutrino Burst Observatory (SNBO) proposed by Cline et al., based on the detection of the neutrinos by neutral current nuclear excitation in natural rock. This would result in the emission of neutrons, which could be captured by counters embedded in the rock. This scheme would be sensitive principally to the higher temperature mu and tau neutrinos and would allow time-of-flight measurement of neutrino mass if in the cosmologically interesting range 10-100 eV. The present paper proposes a new neutron detection arrangement which improves detection efficiency and reduces cost by a factor ~30, allowing the time profile of over 2000 nu_mutau events to be recorded with only 200 tons scintillator. This new scheme represents the optimum configuration for a natural underground rock target. A Galactic supernova signal would be a factor 10-30 above neutron background (from cosmic ray muons and alpha activity) in sites with depth >500 mwe. Another major improvement results by supplementing the rock with more favourable target elements such as iron or lead, giving sensitivity to all three neutrino types and mixing between these. Some calculations are included on the speculative possibility of extra-Galactic supernova neutrino detection using this principle.

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