Hi Robin

> In order to flip the charge, you probably need to add the difference in 
> energy,
i.e. 2 proton masses worth, or about 2 GeV.
[snip]

It is very doubtful that the entire mass-energy of a proton is to be found in 
charge alone which is the implication of what you are saying. 

For instance, a neutron with no charge has about the same mass-energy as a 
charged proton. I suspect the energy needed to conjugate charge in the proton  
is about the same as the difference in mass between the neutron and proton. Far 
less.

Jones

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