Spectroscopy and shell model interpretation of high-spin states in the N = 126 nucleus ²¹⁴Ra

Excited states in the N = 126 nucleus ²¹⁴Ra have been studied using γ-ray and electron spectroscopy following reactions of ¹²C and ¹³C on ²⁰⁶Pb targets. Levels were identified to spins of ∼ 25 h{stroke} and excitation energies of ∼ 7.8 MeV. Lifetimes and magnetic moments were measured for several levels, including a spin (25^-) core-excited isomer at 6577.0 keV with τ = 184 ± 5 ns and g = 0.66 ± 0.01. The level scheme, lifetime and magnetic moment data are compared with, and discussed in terms of, empirical shell-model calculations and multiparticle octupole-coupled shell-model calculations. In general, the experimental data are well described by the empirical shell model.