Magnetic moments at backbending and spectroscopy of 134Ce

Employing the static hyperfine fields at cerium nuclei in magnetized Fe and Gd hosts, the g-factor of the ¹³⁴Ce(10⁺) state at backbending (E_{x = 3719.3 keV}) has been determined as g = ? 0.30 (25). The coexistence of this neutron-dominated state with the ($\text{v}\text{h}{}_{\mathrm{<mtext>11</mtext><mtext>2</mtext>}}\text{)}{}^{\mathrm{n}}\text{10}{}^{\mathrm{+}}$ isomer (E_x = 3208.5 keV, g = ?0.19(1)) is unexpected. A comprehensive spectroscopic study following the ¹²²Sn(¹⁶O, 4n) reaction, including γ-angular distributions, prompt and delayed γ coincidence and recoil-distance measurements has yielded new information on quasi-collective bands of both parities. The properties of the low-lying positive-parity states are well described by the interacting boson model.