In previous papers in this journal a new theory of fundamental particles has been presented. It requires that the proton contain a positron.

Furthermore, consistent with nuclear electron capture, it also holds that neutron formation involves combining a proton with an electron. The captured electron appears to remain isolated from the positron, and if so it may be found that contacting an isolated neutron with a positron results in a proton and one or two gamma rays, presumably due to the annihilation of a positron/electron pair.

e⁺ Neutron --> Proton + gamma

Production of a neutrino may also be observed.

As previously mentioned in the article entitled "Implications of Dirac's Monopoles for Color Charged Particles of the New Quark Theory", another prediction of the theory is that there should be two kinds of neutral pion, only one of which (Pion'0) comprises an electron/positron pair which annihilates to radiate gamma rays.

Sigma⁺ --> Proton + Pion'0
Pion'0 --> gammas + neutrinos?

The neutral pion from the following reaction should not radiate gammas.

Lambda --> Neutron + Pion0
Pion0 --> neutrinos

Also see the following relevant papers: