For 10 points, name the antiparticle of the electron.
If not for conservation of baryon number, this particle could result together with a pion from the decay of a proton. The emission of this particle by FDG can trace glucose uptake via the (**) annihilation of this particle in its namesake emission tomography. Particles of this type may be observed when a cloud chamber is exposed to gamma radiation, and they are emitted together with a (*) neutrino during the beta decay of proton-rich nuclei. The existence of this particle was predicted by the 'negative-energy solution' of British physicist Paul Dirac's namesake equation but it was discovered by the American Carl Anderson. For 10 points, name the antiparticle of the electron.
If not for conservation of baryon number, this particle could result together with a pion from the decay of a proton.
positron