Nuclear wave functions and mesonic exchange currents in the weak transition 16O(0+) reversible 16N(0-)

It is shown 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(0-, 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 larger meson exchange effect. (Auth.)