Abstract
The parity- and isospin-forbidden {alpha}{sub 0} decay from {sup 16}O{sup *}({ital J}{sup {pi}}=2{sup {minus}}, {ital T}=1, {ital E}{sub {ital x}}=12.9686 MeV) to {sup 12}C(g.s.) has been investigated theoretically. Considering various strong and weak interaction models the longitudinal {ital A}{sub {ital L}} and the irregular transverse {ital A}{sub {ital b}} analyzing powers of the reaction {sup 15}N({ital {rvec p}},{alpha}{sub 0}){sup 12}C have been calculated in the energy range of the 2{sup {minus}} resonance in {sup 16}O{sup *}. Energy anomalies for the expected interference effects, relevant for experiments, have been found to be {ital A}{sub {ital L}}=1.1{times}10{sup {minus}5} and {ital A}{sub {ital b}}=0.9{times}10{sup {minus}5} at {theta}=90{degree} and {ital A}{sub {ital L}}=1.4{times}10{sup {minus}5} and {ital A}{sub {ital b}}=0.2{times}10{sup {minus}5} at {theta}=150{degree} 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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