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mfb- t1_jbzmvab wrote

> I thought antiparticles only annihilated with their respective particles?

Reacting with the respective partner is easier (in the sense that it's always possible), but annihilation is not limited to that. Protons and antineutrons will react in almost the same way as protons and antiprotons or neutrons and antineutrons, producing a couple of pions as most likely result.

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