Attention is drawn to a possible band structure displayed by the known N* resonances. The observed spectrum is similar to that predicted by a paraquark harmonic-oscillator shell model. Exact three-body Schr\"odinger wave functions are used to compute the Nπ and Δπ partial decay widths, assuming the pion emission takes place via a one-quark de-excitation. The agreement with experiment is very good.
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Faiman et al. (1968) studied this question.
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