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The positron quickly finds an electron, and they [[Annihilation|annihilate]] each other. The two resulting [[gamma ray]]s (γ) are detectable. The neutron can be detected by its capture on an appropriate nucleus, releasing a gamma ray. The coincidence of both events—positron annihilation and neutron capture—gives a unique signature of an antineutrino interaction.
In February 1965, the first neutrino found in nature was identified by a group including Frederick Reines and [[Friedel Sellschop]].<ref>{{Cite web |url=https://www.space.com/what-are-neutrinos |title=What are neutrinos? |date=2022-09-21 |access-date=2023-12-22 |website=Space.com |last=Cooper |first=Keith}}</ref><ref>{{cite journal |last1=Reines |first1=F. |last2=Crouch |first2=M. F. |last3=Jenkins |first3=T. L. |last4=Kropp |first4=W. R. |last5=Gurr |first5=H. S. |last6=Smith |first6=G. R. |last7=Sellschop |first7=J. P. F. |last8=Meyer |first8=B. |title=Evidence for High-Energy Cosmic-Ray Neutrino Interactions |journal=Physical Review Letters |date=30 August 1965 |volume=15 |issue=9 |pages=429–433 |doi=10.1103/PhysRevLett.15.429 |bibcode=1965ICRC....2.1051R |url=https://adsabs.harvard.edu/full/1965ICRC....2.1051R |access-date=22 December 2023}}</ref> The experiment was performed in a specially prepared chamber at a depth of 3 km in the [[East Rand Mine|East Rand ("ERPM") gold mine]] near [[Boksburg]], South Africa. A plaque in the main building commemorates the discovery. The experiments also implemented a primitive neutrino astronomy and looked at issues of neutrino physics and weak interactions.<ref>
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