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Mar 22, 2014 at 11:29 comment added John Rennie Aha! This is the answer I was thinking of.
Mar 22, 2014 at 11:26 comment added John Rennie Bearing in mind that the neutron is a composite of quarks and gluons the neutron-antineutron reaction is going to be exceedingly messy. The probability that it will produce just two photons is vanishingly small. I'm sure Anna posted experimental data on proton-antiproton products in an answer (and it was messy) but I can't find the question ...
Mar 21, 2014 at 20:40 history edited ClassicalPhysicist CC BY-SA 3.0
Question phrased more precisely because it led to an incomplete answer
Mar 21, 2014 at 20:27 answer added dmckee --- ex-moderator kitten timeline score: 1
Mar 21, 2014 at 20:18 history asked ClassicalPhysicist CC BY-SA 3.0