Positronium

Positronium signature in organic liquid scintillators for neutrino experiments D. Franco, G. Consolati, and D. Trezzi Phys. Rev. C 83, 015504 Published 27 January 2011 [6 pages] doi: 10.1103/PhysRevC.83.015504 Preprint: arXiv:1011.5736 Abstract Electron antineutrinos are commonly detected in liquid scintillator experiments