Detection of Supernova Neutrinos via Neutrino-Proton Elastic Scattering in the KamLAND Detector

Details Detection of Supernova Neutrinos via Neutrino-Proton Elastic Scattering in the KamLAND Detector Detection of Supernova Neutrinos via Neutrino-Proton Elastic Scattering in the KamLAND Detector

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dnp.as024f&link_type=abstract

American Physical Society, Division of Nuclear Physics Meeting, October 4-7, 2000 Williamsburg, VA, abstract #AS.024

Physics

Nuclear Physics

Scientific paper

We propose to use neutrino elastic scattering on protons, ν+parrow ν+p, as a tool for detection of neutral current supernova signals. The large size and low threshold of the KamLAND detector make detection of supernova neutrinos via this reaction possible. This has not been recognized previously. With typical neutrino spectra, one gets recoil protons of energies up to several MeV. Quenching of the scintillation light when compared to photons and electrons reduces the effective energies of the struck protons by an average factor of 4, leaving roughly 300 events above KamLAND's threshold. Because of quenching and an intrinsically harder neutrino spectrum, these events are dominated by ν_μ, ν_τ and \overlineν_μ, \overlineν_τ reactions. In KamLAND, these reactions can be separated from other supernova neutrino reactions, yielding a clean proton spectrum of the ν_μ,τ + p arrow ν_μ,τ + p and \overlineν_μ,τ + p arrow \overlineν_μ,τ + p events. It is possible to relate this statistically to the ν_μ,τ and \overlineν_μ,τ spectra. This is the only known 'clean' neutral current reaction that yields a spectrum for these flavors of neutrinos.

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