High-spin states were populated in 108 Cd using the 96 Zr( 16 O,4n) reaction at a beam energy of 72 MeV. Two magnetic dipole bands have been observed, both of which contain weak E2 crossover transitions. Lifetimes for the stronger of the two bands were measured via the Doppler shift attenuation method. The configuration assignment for this band has been determined from comparison with tilted axis cranking model calculations to be ͓g 9/2 Ϫ3 g 7/2 ͔ ͓h 11/2 (g 7/2 d 5/2 ) 1 ͔ and ͓g 9/2 Ϫ3 g 7/2 ͔ ͓h 11/2 3 (g 7/2 d 5/2 ) 1 ͔, before and after the h 11/2 2 band crossing, respectively. The deduced B(M 1) strengths decrease rapidly with increasing spin after the h 11/2 2 alignment, which is a characteristic behavior of a shears band.

Lifetimes of states in a rotational-like M1 band in 110 Cd have been determined through a Dopplershift attenuation method measurement performed with the Gammasphere array. The deduced B͑M1͒ values, which agree well with the predictions of the tilted axis cranking model, clearly confirm that it has the character of a shears band. Using a semiclassical scheme of the coupling of two long j vectors we deduce information on the strength and form of the effective interaction between the constituent nucleons. These results are the first definitive evidence of the shears mechanism and "magnetic rotation" in this mass region. [S0031-9007 (99)08994-2]

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