Resonance photocouplings with a "mixed" nucleon and the even-wave harmonic-oscillator theory of baryonic states

A model of the nucleon as a $|56\mathrm{}〉cos\theta +|70\mathrm{}〉sin\theta$ octet, with $cot\theta \approx \pm \sqrt{2}$, facilitated by an even-wave harmonic-oscillator theory proposed by one of us (A.N.M.), together with a complementary set of selection rules for transitions to|56> and|70> states based on this theory, provides an almost parameter-free prediction of photocouplings in excellent accord with the latest data, including the so-far-unexplained cases of $D_{15}\left(p\gamma \right)$, $P_{11}\mathrm{}\left(1470\right)\mathrm{}$, and $F_{35}\mathrm{}\left(1890\right)\mathrm{}$.