NUCLEAR WAVE-FUNCTIONS AND MESONIC EXCHANGE CURRENTS IN THE WEAK TRANSITION O-16(0+)]--]N-16(0-)

We show that any deviation from the closed-core hypothesis for 16O(0+, g.s.) may strongly affect the theoretical ratio of the transition probabilities for the two inverse processes: 16O(0+, g.s.) → 16N(O-, 120 keV) muon-capture) and 16N(0-, 120 keV) → 16O(0+, g.s.) (beta-decay). As a consequence, the possible evidence for exchange currents in this transition must be reexamined. Preliminary calculations do not exclude a still large meson exchange effect. © 1979.