The proton and neutron form the nucleon isospin doublet, with spin angular momentum and baryon number one. A unit Skyrmion with the fermionic Finkelstein-Rubinstein constraints gives these quantum numbers in its lowest rotational multiplet.
A nucleon is a particle that makes up the nucleus of an atom. There are two types of nucleons: protons and neutrons. - **Protons** are positively charged particles found in the nucleus, and they determine the atomic number of an element, which defines the element itself. - **Neutrons** are electrically neutral particles that also reside in the nucleus and contribute to the atomic mass of an element.
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