New Level Structure of ^162,164Gd

Levels in ^162,164Gd were constructed via γ-γ-γ and γ-γ-γ-γ coincidence data from observations of ²⁵²Cf spontaneous fission. γ-rays from fission events of a 62 μCi ²⁵²Cf source were measured in the center of the Gammasphere detector array. This produced 5.7x10¹¹ γ-γ-γ or higher coincidence events and 1.9x10¹¹ γ-γ-γ-γ or higher coincidence events. This data set was analyzed to construct new energy level schemes for ^162,164Gd. Levels and transitions previously identified in the ground state rotational bands have been confirmed. Additionally, several new transitions and levels are observed in both isotopes, including the establishment of a γ vibrational band from 2⁺ to 9⁺ for the first time, and the addition of a level in the yrast band of ¹⁶²Gd.