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The Positron is the antiparticle of the electron, with equal rest mass and spin but electric charge . It can be created in beta-plus decay or in a sufficiently energetic pair production process.
An electron and Positron can undergo electron-positron annihilation. For the two-photon channel from a pair initially at rest, conservation of momentum requires opposite photon directions and each photon has energy , neglecting binding. Initial motion or a different allowed final state changes that simple picture. Annihilation is conversion of the initial particles' energy into other excitations, not disappearance of conserved energy or charge.