High-spin states inGd152

High-spin states of {sup 152}Gd have been studied via the {sup 148}Nd({sup 9}Be,5n){sup 152}Gd fusion-evaporation reaction at a beam energy of 54 MeV. The ground-state band, octupole band, and {beta} band have been extended up to spins 20{sup +}, 21{sup -}, and 16{sup +}, respectively. A possible aligned two quasineutron band, which becomes the yrast band above the spin 16{sup +}, was observed for the first time. The kinematic behaviors of the ground-state bands and yrast bands in {sup 152,154}Gd indicate that the shape of {sup 152}Gd may change with increasing rotational frequency and the difference of quadrupole deformations between {sup 152}Gd and {sup 154}Gd obviously reduces around the first band crossing region. These observations are consistent with the theoretical calculations using cranked Woods-Saxon-Strutinsky methods. The first band crossing observed in {sup 152}Gd can be ascribed to the alignment of a pair of i{sub 13/2} neutrons. The identical ground-state bands in {sup 152}Gd and {sup 154}Dy were extended.