Can a gamma initiate weak decay of a proton?

[Philip Wood]

Does this ever happen?

p + \gamma \rightarrow n + e+ + \nu_e

It seems possible, if the \gamma has enough energy, but I wonder if anyone can confirm that it happens.

[PAllen]

Does this ever happen?

p + \gamma \rightarrow n + e+ + \nu_e

It seems possible, if the \gamma has enough energy, but I wonder if anyone can confirm that it happens.

While I have no idea of whether this could happen in practice, or what the cross section would be, I don't see anything to fundamentally prohibit it. In fact, it strikes me you could look at this as combining two well known interactions that do occur:

p + gamma -> p + e+ + e-

then, electron capture. Combine, and you get the proposed reaction. This supports the view that there shouldn't be anything fundamental prohibiting this.

[Philip Wood]

Thank you. This does indeed make it seem even more plausible.