Two-Photon Total Annihilation of Molecular Positronium

Abstract

The rate for complete two-photon annihilation of molecular positronium Ps${}_2$ is reported. This decay channel involves a four-body collision among the fermions forming Ps${}_2$, and two photons of 1.022 MeV, each, as the final state. The quantum electrodynamics result for the rate of this process is found to be ${\Gamma }_{P{s}_2\to \gamma \gamma }$ = 9.0 $\times 10^{-12}$ s${}^{-1}$. This decay channel completes the most comprehensive decay chart for Ps${}_2$ up to date.

4 pages, 2figures and 1 table

References in corpus (1)

• The sky distribution of positronium annihilation continuum emission measured with SPI/INTEGRAL

Cited by in corpus (1)

• Rare decays of the positronium ion and molecule, ${\text{Ps}}^{-}\to e^{-}\gamma$ and ${\text{Ps}}_2\to e^{+}{e}^{-}\gamma ,\gamma \gamma ,e^{+}{e}^{-}$