I should probably do a last paper on quantum-mechanical tunneling and potential barriers and their corollary, of course: potential wells. Indeed, the ring current model comes with a dynamic view of the fields surrounding charged particles. Potential barriers should, therefore, not be thought of as static fields: they vary in time. They are the joint result of two or more charges moving around. Hence, a particle breaking through a ‘potential wall’ or coming out of a potential ‘well’ probably just uses an opening which corresponds to a classical trajectory. However, it is not an easy analysis: it should be relativistically correct and we, therefore, need to describe the fields in terms of the vector potential and all that. I’ll need to look the math again here.
Post scriptum (1 June 2020): I just added an introduction to the paper. It talks about recent attempts to explain what might be going on inside of the atomic nucleus in terms of electromagnetic interactions only. Such analyses are usually referred to as an electromagnetic theory of nuclear interaction or – using more formidable language – nuclear lattice effective field theory (NLEFT) and they will, hopefully, gain much more acceptance in the future. They should—because they make sense! 🙂