Abstract
Microscopic structures of the low-lying intrinsic bands in the odd-neutron N = 91 153 Sm , 155 Gd and N = 93 155 Sm nuclei near the onset of the quadrupole deformation region are investigated with special attention being paid to the formation of octupole collectivity. Octupole correlations between nonrotational states are analyzed using a model Hamiltonian containing an axially symmetric mean field, pairing, quadrupole-quadrupole and octupole-octupole interactions. In addition, the strong ΔK = 0 E1 transitions in the N = 91 nuclei are examined. These calculations provide a theoretical basis for the previous parity doublet assignments in 153 Sm in the low energy region, and less conclusively for 155 Gd . They suggest a more complex spectroscopy for 155 Sm , intermediate between octupole vibration and deformation.
Published Version
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