Nearly 14 years of observations at the detector—1,000 meters underground in Japan—found a neutrino signal in Cherenkov light from interactions in 50,000 tons of ultrapure water.
The result is still an indication rather than a confirmed detection, but scientists called it a long-sought milestone for tracing how massive stars die and leave behind neutron stars or black holes.
Because core-collapse supernovas have been occurring for roughly 13 billion years, confirming the DSNB could open a new way to study the universe's cumulative stellar death history.
Researchers said future work will combine ongoing Super-Kamiokande observations with the successor Hyper-Kamiokande to improve sensitivity and test the signal.
Beyond dead stars, could these 'cosmic ghosts' finally reveal the true nature of dark matter?
As scientists 'hear' whispers of dead stars, is it a true cosmic echo or just background noise?
Super-Kamiokande Detects Relic Supernova Neutrinos at 99.5% Confidence: A Milestone Toward Definitive DSNB Discovery
Overview
In 2026, the Super-Kamiokande Collaboration announced the first strong indication of the Diffuse Supernova Neutrino Background (DSNB), marking a major milestone in neutrino astronomy. This breakthrough was achieved by analyzing about 5,000 days of data collected over two operational phases. The key improvement was adding gadolinium to the detector’s water, which made it much easier to identify neutrino interactions and greatly reduced background noise. By carefully removing unwanted background events, the team was able to isolate the faint DSNB signal, bringing scientists closer to directly observing these elusive particles from ancient supernovae and opening a new window into the universe’s history.