Definition:
   Nucleons - the composite particles consisting of mesons and leptons.

Nucleons do not form an own class of particles.
The proton similar concerns to particles of a class Kaons2, a neutron - to Baryons.

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Abridged variant Complete variant
 
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Version 6 Version 7
























What of these Versions corresponds to the real proton while it is difficult to tell.
I "like" :-) Versions 6 (closer to "sphere") and 7 (a tetrahedron, as is known, the "strongest" geometrical figure).
The Version 6 also looks very "strongly". In my opinion, it has the greatest probability to be proton. 31 years ago I considered practically also ...

Note:
   1. In the table, under the term "Mass mc2 of exterior " is understood increase of a rest mass of a particle due to an exterior .
   2. Under the term "Total energy of exterior " is understood "pure" energy of exterior . I.e. an odds between in "Mass mc2 of exterior " and a rest mass of an electron (positron) equal 0,511 Mev.
   3. Dark blue color marks numerals and the channels of decay taken from the manual "The 2003 Review of Particle Physics".
   4. If animation of the proton in the bottom table is not played, on a computer it is necessary to install the program ® FLASH Macromedia.
   5. From all possible variants of a structure of the proton, models with amount of pions from 6 up to 12 are chosen. It selected only symmetric models with average radius of the proton near 0.84184*10-15m (the radius of the proton from the experimental data for July 2010.), which corresponds to the plane of rotation of the largest "flat triangle" of 6 pions.
   6. In Version 1 only 6 pions, and the total of their masses (814.4532 Mev) of appreciablly less mass of the proton (938.2720 Mev). Here it is supposed, that the missing rest mass of the proton is formed due to its natural gyration. But 6-pion variant structure of the proton is unlikely given the known strength of the proton.