That neutrons can be transmuted to protons, electrons and antineutrinos through the process of beta decay is old hat. That photons sometimes also get in on the act was suspected, but until now never confirmed.
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Severijns, N. Neutrons radiating decay. Nature 444, 1014–1015 (2006). https://doi.org/10.1038/4441014a
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DOI: https://doi.org/10.1038/4441014a
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