Quadrupole moment of high-spin yrast trap in /sup 147/Gd

Static quadrupole interactions of three /sup 147/Gd isomers in single crystals of hexagonal gadolinium have been observed. The quadrupole moments increase with increasing spin and imply a substantial (oblate) deformation (..beta.. approx. -0.2) for the 500-ns high-spin yrast trap.