Evidence of High-Energy Neutrinos from SN1987A by Kamiokande-II and IMB

TL;DR

This paper reports potential evidence of high-energy neutrinos from supernova SN1987A, detected by Kamiokande-II and IMB experiments, with a low probability of chance coincidence suggesting a real astrophysical signal.

Contribution

First detection of high-energy neutrinos from SN1987A using upward-going muons in two different neutrino observatories.

Findings

Two upward-going muons recorded by Kamiokande-II.

Two upward-going muons recorded by IMB.

Chance coincidence probability of 0.27%.

Abstract

High-energy neutrinos from SN1987A were searched for using upward-going muons recorded by the Kamiokande-II experiment and the IMB experiment. Between 1987 August 11 and October 20, and from an angular window of 10 degree radius, two upward-going muon events were recorded by Kamiokande-II, and also two events were recorded by IMB. The probability that these upward-going muons were explained by a chance coincidence of atmospheric neutrinos was calculated to be 0.27%. This shows possible evidence of high-energy neutrinos from SN1987A.