Blue toruses = 13 protons
Red toruses = 6 nuclear electrons
Atomic number of N (7) = protons (13) - nuclear electrons (6)
Nitrogen 13 transform by electron capture (into the central position) of recombinant form to Carbon 13 (stable)
The electron originates from a photon via pair production, where the generated electron captured by N13 nucleus
while other component of photon, the positron emanated.
The proton nanotube nucleus (= 13 blue proton torus) has a negatively charged outer electron nanotube (= 6 red electron torus),
hindering K electron accessibility to N13 nucleus. The neutral photon easily access nucleus, providing required electron.
The rest of positron emitted. The energy for pair production served by N13 nucleon.
Click on image for Carbon 13 nuclear structure
Yin-yang photon model of light
Nuclear symmetry, Nuclear structure of elements