Neutron decay does not produce photons. Rather, the energy difference is carried as kinetic energy by the resulting proton, electron and (anti)neutrino. This can cause light to be emitted (very shortly) later when those particles slam into things, but as sharikous notes that doesn't seem to be they're talking about here.
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Yes, the decay will also release some energy in the form of photons but they didn't mention it.
Neutron decay does not produce photons. Rather, the energy difference is carried as kinetic energy by the resulting proton, electron and (anti)neutrino. This can cause light to be emitted (very shortly) later when those particles slam into things, but as sharikous notes that doesn't seem to be they're talking about here.
That's inaccurate, please see my reply to the same comment