DOIAbstract
The authors study the deformation and the spectral structure of low-lying bands in the nuclei <SUP>80</SUP>Zr, <SUP>79,81</SUP>Y and <SUP>81</SUP>Zr using the deformed-shell model based on Hartree-Fock fields. In their calculation, <SUP>56</SUP>Ni is taken as the inert core with the model space consisting of 1p<SUB>3/2</SUB>, 0ƒ<SUB>5/2</SUB> 1p<SUB>1/2</SUB> and 0g<SUB>9/2</SUB> states. An effective interaction given by Kuo (1985) and modified by Bhatt (1988) for this configuration space has been used in the calculation. The role of the g<SUB>9/2</SUB> state in producing large deformations in <SUP>80</SUP>Zr is analysed
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