Deformation of Very Light Rare-Earth Nuclei

Abstract
Gamma-ray spectra of neutron-deficient isotopes between cerium (Z=58) and gadolinium (Z=64) have been investigated. New bands of states were identified in many even-even, odd-A, and odd-odd nuclei. This Letter reports results on the ground-state bands in the even-even nuclei Ce6858126, Nd68,70,7260128,130,132, Sm72,7462134,136, and Gd74,7664138,140. The systematic trends of deformation are presented and compared with theoretical predictions. The lightest isotopes appear to be axially symmetric rotors with ε20.3.

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