Decay Of 1(+) States As A New Probe Of The Structure Of 0(+) Shape Isomers

The nuclides Mo-98 and Mo-100 have been studied in photon-scattering experiments by using bremsstrahlung produced from electron beams with kinetic energies from 3.2 to 3.8 MeV. Six electromagnetic dipole transitions in Mo-98 and 19 in Mo-100 were observed for the first time in the energy range from 2 to 4 MeV. A specific feature in the two nuclides is the deexcitation of one state with spin J=1 to the 0(+) ground state as well as to the first excited 0(+) state, which cannot be explained in standard models. We present a model that allows us to deduce the mixing coefficients for the two 0(+) shape-isomeric states from the experimental ratio of the transition strengths from the J=1 state to the 0(+) ground state and to the 0(+) excited state.