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A new symmetry in collective motion

The purity of intrinsic states of nuclei with respect to a proton-neutron boson symmetry (F-spin) is shown to be largely determined by the difference between proton and neutron deformations and not by whether the Hamiltonian is an F-spin scalar. F-spin mixing in the ground state band of {sup 165}Ho is estimated using recent pion single-charge-exchange data. A B(M1) sum rule is derived using F-spin symmetry. 27 refs., 1 fig.