Questions tagged [x17]

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1answer
5k views

Was X17 predicted before it was observed?

Articles, with very little detail, have made their rounds about an X17 boson (16.7 MeV) being observed in tests of decaying beryllium-8 and perhaps once in a test with helium. Most of the ...
3
votes
2answers
157 views

Why should the X17 be a force carrier?

A preprint has been recently published on arXiv about another experimental evidence of the existence of the X17 particle, a 17 MeV boson that would be a potential force carrier. Now, I don't have a ...
16
votes
2answers
3k views

Is the “protophobic fifth force” observed in nuclear decays a new fundamental force?

There is a recent paper in PRL, also on the ArXiv that claims the discovery of a fifth force, mediated by a 17 MeV boson, which explains an anomaly in nuclear decays. Is this a real effect? Could the ...