Abstract
We show that in a quantum system with induced gauge fields, isotopic spin degrees of freedom are converted into spin degrees of freedom. There is no gauge field in the initial formulation of the theory. The magnetic-monopole fields are induced, when there exist isotopic-spin-degenerate energy levels in the adiabatic evolution of parameters. The effective Hamiltonian describes motion in the monopole fields. Isotopic spin appears as part of the conserved total angular momentum.
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