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The parity-and isospin-forbidden a decay from ' O*(J =2, T =1, E =12.9686 MeV) to ' C(g.s.) has been investigated theoretically. Considering various strong and weak interaction models the longitudinal Al and the irregular transverse Ab analyzing powers of the reaction "N(p, ao)' C have been calculated in the energy range of the 2 resonance in ' 0*. Energy anomalies for the expected interference effects, relevant for experiments, have been found to be AL =1.1X10 ' and A& =0.9X10 ' at 8=90' and AL=1.4X10 ' and Ab=0. 2X10 ' at 0=150' based on a conservative value of 0.1 eV for the parity-nonconservation matrix element. A proposal for an experimental investigation is sketched.

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