The low-spin states and intermediately high spin states below the second backbendings of N=88 isotones were studied in the interacting-boson-plus-one-fermion-pair model. It was found that the energy spectra can be reproduced quite well. The spectroscopic quadrupole moments of ${}_{}{}^{154}{}_{}{}^{}\mathrm{Dy}$ were calculated and compared with the available experimental data. Both the backbending behavior and the decrease of the quadrupole moments at high spin states can be reproduced.

• Received 9 December 1987

DOI:https://doi.org/10.1103/PhysRevC.38.993