PAULI PRINCIPLE AND PION DISTORTION IN THE P-WAVE PIONIC DOUBLE-CHARGE-EXCHANGE REACTION

We propose an approach which takes the Pauli principle and pion distor tion into account to investigate the p-wave absorption/emission mechan ism of the double charge exchange reaction. The ground state to ground -state processes Te-128(pi(+),pi(-))Xe-128 and Te-130(pi(+), pi(-))Xe- 130 are discussed in the new approach. Excitation functions with a max imum energy distribution at T-pi approximate to 50 MeV have been obtai ned. The calculated differential cross sections at theta(Lab.) = 30 de grees with T-pi approximate to 50 MeV and their ratio agree well with experimental data and depend only slightly on the particle-particle in teraction parameter g(pp) Results indicate that the Pauli principle lo wers the cross section and stabilizes its dependence on g(pp) evidentl y while pion distortion reduces the cross section in the energy region above the resonance.