Abstract
A rotational band of eleven gamma -rays has been observed in 139Gd showing an enhanced moment of inertia indicative of a band of higher quadrupole deformation than the low-lying states. This band is believed to be built on a single nu i13/2 intruder orbital, and extends the systematics of such bands, recently observed in several samarium nuclei (Z=62), to gadolinium (Z=64). An attempt is made to deduce the spins for levels within this band by fitting the extracted moment of inertia with a power expansion in terms of the rotational frequency. This method is also used to deduce the spins for other bands of enhanced deformation in this mass region; the method is shown to reproduce the known spins for the nu i13/2 intruder bands in the 135,137Sm isotopes.
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