Abstract
The excited levels of $^{142}\mathrm{Ce}$ have been studied using the (n,${\mathit{n}}^{\ensuremath{'}}$\ensuremath{\gamma}) reaction. Excitation functions, angular distributions, and Doppler shifts were measured for \ensuremath{\gamma} rays from levels up to an excitation energy of 3.3 MeV; multipole-mixing and branching ratios and transition rates were deduced. Theoretical predictions of electromagnetic transition rates were compared for the interacting boson model, the quasiparticle phonon model, and the particle-core coupling model with experimental values. Evidence is found supporting the fragmentation of mixed-symmetry strength among neighboring $^{142}\mathrm{Ce}$ excited levels. This fragmentation is evinced in the ${2}^{+}$ excitations through strong M1 transitions; however, the ${3}^{+}$ mixed-symmetry strength is not manifested directly through strong M1 transitions, but rather is implied through model calculations. Candidates for multiphonon excitations are identified for the three-quadrupole and quadrupole-octupole phonon quintets.
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