Transitions, with change in parity, produced in 107,109Ag by coulomb excitation

Abstract

Some of the low-lying energy levels of 107Ag and 109Ag were excited by Coulomb excitation using α-particles from 4.8 to 7.2 MeV. Transitions to the isomeric state ( 7 2 + ), involving a parity change, were observed both directly in the singles spectra and indirectly by the decay of the isomer. The isomer in both silver isotopes was populated by transitions from the 5 2 − level, which was strongly excited. The observed branching ratio in 109Ag for the 5 2 − → 7 2 + transition was (0.315 ± 0.09) % and for the 5 2 − → 9 2 + transition was (0.055±0.03) %. The total rate of populating the 7 2 + level from the 5 2 − level was (0.215±0.04) % in 107Ag. The level schemes have been discussed on the weak-coupling model, allowing admixtures of singleparticle wave functions to account for the weaker transitions.