Skyrmion model of a nucleus ($B=A$)

A charge-$A$ multi-Skyrmion provides an intrinsic field configuration for an atomic nucleus with mass number $A$. Its spatial and isospin collective coordinates must be quantized, with Finkelstein-Rubinstein constraints, before assigning physical nuclear states. A classical intrinsic shape is distinct from rotationally invariant observables in a spin-zero state.