Positron Annihilation in the Milky Way: Searching for the source of Galactic antimatter
For more than 50 years, the rate and distribution of positron (anti-electron) annihilation in the Milky Way has puzzled astronomers. Positrons with low (around an MeV) initial energies are likely to be predominantly produced by beta-plus unstable radioactive isotopes. However, the observed rate of positron annihilation in the interstellar medium of the Milky Way exceeds the predicted rate of positron production by 'conventional sources' such as core-collapse and Type Ia supernovae. Moreover,...[Show more]
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