# Do composite particles that are electrically neutral but have charged constituents radiate?

For example an electron radiates when accelerated. So does a positron. But is the radiation emitted by accelerated positronium the sum of the radiation emitted by each separately? If not, why not? If so, does this provide a way of testing whether a given neutral particle is composite? For example, does a neutron bremsstrahlung when decelerated?

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It depends on how fast you accelerate the particle. For slow accelerations, no, for fast accelerations (where you see the constituents) yes. Neutrons have a magnetic moment by the way, so the answer is just yes. But I suppose you are interested in accelerating an Helium atom. – Ron Maimon Jun 22 '12 at 1:13