${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}$ positronium  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
S009.20
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{3}$ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}$ positronium ($1.82$ $\pm0.29$) $ \times 10^{-9}$ 67
The following data is related to the above value:
$\Gamma({{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}$ positronium$)/\Gamma({{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{3}/\Gamma_{1}$