NUCLEAR MATRIX-ELEMENTS OF AXIAL-CHARGE EXCHANGE CURRENTS DERIVED IN HEAVY-FERMION CHIRAL PERTURBATION-THEORY

We calculate shell-model matrix elements of the axial-charge exchange current operators that have been obtained up to the next-to-leading or der from heavy-fermion chiral perturbation theory. It is found that lo op corrections to the soft one-pion-exchange contribution are small (a round 10%) and have no significant dependence on the nuclear mass numb er or on the valence-nucleon orbits. These results render further supp ort to the chiral-filtering conjecture.