Magnetic dipole band in 124 Xe

High-spin states in ${}^{124}\mathrm{Xe}$ were populated in the fusion-evaporation reaction ${}^{110}\mathrm{Pd}{(}^{18}\mathrm{O}{,4n)}^{124}\mathrm{Xe}$ at a beam energy of 86 MeV. The experiment was performed at the NORDBALL spectrometer in Ris\o{}, Denmark. The decay out of a magnetic dipole band was established for the first time in this nucleus. By means of angular correlations from oriented states the multipole mixing ratios for 9 of the 12 gamma transitions of the magnetic dipole band were deduced. The experimental $B(M1;\stackrel{\ensuremath{\rightarrow}}{I}I\ensuremath{-}1)/B(E2;\stackrel{\ensuremath{\rightarrow}}{I}I\ensuremath{-}2)$ values were compared to estimates of the D\onau-Frauendorf semiclassical model. The dipole band is inferred to be based on a prolate four-quasiparticle configuration of the type $[\ensuremath{\nu}{(h}_{11/2}\ensuremath{\bigotimes}{g}_{7/2})]\ensuremath{\bigotimes}[\ensuremath{\pi}{(h}_{11/2}\ensuremath{\bigotimes}{d}_{5/2}{/g}_{7/2})].$