2-QUASIPROTON CONFIGURATIONS IN DY-164

The two-quasiproton structure of Dy-164 has been investigated in a study of the Ho-165(t, alpha)Dy-164 reaction. The experiment was performed using a 37.3 MeV triton beam delivered by the Daresbury tandem Van de Graaff accelerator. Magnetic analysis of ejectile ions was achieved using a QMG/2 magnetic spectrometer, and ion identification and detection employed a hybrid gas-filled, multielement, focal-plane detector. The two-quasiproton strengths accessed in this reaction are discussed with reference to the detailed spectroscopy of Dy-164. In particular, a rotational band built on a K(pi) = 1+ state, previously interpreted as a collective structure, was observed and assigned as a two-quasiproton excitation which at zero deformation is based on the spherical (h11/2)2 shell-model state. The structure of the octupole-vibrational band and that of other states in the final nucleus have been elucidated.