P, T-VIOLATING NUCLEAR MATRIX-ELEMENTS IN THE ONE-MESON EXCHANGE APPROXIMATION

Expressions for the P, T-violating NN potentials are derived for pi, r ho, and omega exchange. The nuclear matrix elements for rho and omega exchange are shown to be greatly suppressed, so that, under the assump tion of comparable coupling constants, pi exchange would dominate by t wo orders of magnitude. The ratio of P, T-violating to P-violating mat rix elements is found to remain approximately constant across the nucl ear mass table, thus establishing the proportionality between time-rev ersal-violation and parity-violation matrix elements. The calculated v alues of this ratio suggest a need to obtain an accuracy of order 5 X 10(-4) for the ratio of the PT-violating to P-violating asymmetries in neutron transmission experiments in order to improve on the present l imits on the isovector pion coupling constant.