A new Super-Kamiokande search for supernova relic neutrinos was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 Super-Kamiokande result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes a variety of improvements such as increased efficiency, a lower energy threshold, and an expanded data set. New combined upper limits on supernova relic neutrino flux are between 2.8 and $3.1{\overline{\nu }}_e{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}>16\mathrm{MeV}$ total positron energy (17.3 MeV ${\mathrm{E}}_{\nu }$).

• Received 19 November 2011

DOI:https://doi.org/10.1103/PhysRevD.85.052007