If all positrons form positronium before annihilation in Type Ia supernova ejecta, the 511 keV gamma-ray line flux decreases by about 70 percent and energy deposition increases by up to 2 percent near 100 days.
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Effect of positronium on the $\gamma$-ray spectra and energy deposition in Type Ia supernovae
If all positrons form positronium before annihilation in Type Ia supernova ejecta, the 511 keV gamma-ray line flux decreases by about 70 percent and energy deposition increases by up to 2 percent near 100 days.