The level structures of the neutron-rich 104 Mo and 108 Mo nuclei have been investigated by observing prompt ␥ rays emitted in the spontaneous fission of 248 Cm with the EUROGAM spectrometer. Levels with spins up to 12ប have been observed and ␥ branching obtained. The data can be satisfactorily described when 104,108 Mo are considered as axially symmetric nuclei: in 104 Mo, rotational bands based on the ground state, the one-phonon and the two-phonon ␥-vibrational states and a quasiparticle state have been observed, whereas in 108 Mo the information is limited to the yrast band and the one phonon ␥ band.
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