Abstract
The diffuse supernova relic neutrino signal has never been observed. Currently the world's best upper flux limit comes from a search for inverse beta decay of anti-neutrinos in the Super-Kamiokande (SK) detector. A new SK study utilizes a novel method of spallation tagging, improved event selection, and an expanded data set to lower the analysis energy threshold and improve overall accuracy. Full results of this new study (including a combined upper flux limit of 2.8−3.1 ν̄e events cm−2 s−1 Eν > 17.3 MeV) are presented, as well as a short update on the research and development of using Gadolinium for neutron tagging.
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