We present a level spectrum for ${}_{}{}^{219}{}_{}{}^{}\mathrm{Ra}$ derived from data on the reaction ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$${(}^{14}$C,3n) studied at beam energies near the Coulomb barrier. Measurements of γ-ray excitation functions, γ-γ coincidences, γ-ray angular distributions, and electron conversion coefficients were made. The ground state band shows an alternating parity structure and is consistent with an interpretation in terms of a $g_{9/2}$ neutron weakly coupled to an even-even core. A nonyrast side band is observed and may arise from the anomalous coupling of a $j_{15/2}$ neutron to the core. The dependence of particle-core coupling behavior on the quadrupole deformation of the core and on the orbital in which the odd nucleon is located is discussed.

• Received 14 August 1987

DOI:https://doi.org/10.1103/PhysRevC.36.2286