Stimulated mutual annihilation: How to make a gamma-ray laser with positronium
Theorists expect that positronium, a sort of 'atom' consisting of an electron and an anti-electron, can be used to make a powerful gamma-ray laser. Scientists now report detailed calculations of the dynamics of a positronium BEC. This work is the first to account for effects of collisions between different positronium species. These collisions put important constraints on gamma-ray laser operation.<img src="http://feeds.feedburner.com/~r/sciencedaily/~4/LwuI2ahlRo4" height="1" width="1"/>
