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A search for the relic neutrinos from all past core-collapse supernovae was conducted using 1496 days of data from the Super-Kamiokande detector. This analysis looked for electron-type anti-neutrinos that had produced a positron with an energy greater than 18 MeV. In the absence of a signal, 90% C.L. upper limits on the total flux were set for several(More)
A search for Supernova Relic Neutrinos ¯ ν e 's is first conducted via inverse-beta-decay by tagging neutron capture on hydrogen at Super-Kamiokande-IV. The neutron tagging efficiency is determined to be (17.74 ± 0.04 stat. ± 1.05 sys.)%, while the corresponding accidental background probability is (1.06 ± 0.01 stat. ± 0.18 sys.)%. Using 960 days of data,(More)
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