The high spin states in the odd-odd ${}^{194}$Tl nucleus have been studied by populating them using the ${}^{185,187}$Re(${}^{13}\text{C},xn$) reactions at a beam energy of 75 MeV. A $\gamma -\gamma$ coincidence measurement has been performed using the INGA array with a digital data acquisition system to record the time-stamped data. Definite spin-parity assignment of the levels was made from the DCO ratio and the IPDCO ratio measurements. The level scheme of ${}^{194}$Tl has been extended up to 4.1 MeV in excitation energy and includes 19 new $\gamma$-ray transitions. The $\pi h_{9/2}\otimes \nu i_{13/2}$ band, in the neighboring odd-odd Tl isotopes, show very similar properties in both experimental observables and calculated shapes. Two new band structures, with six-quasiparticle configuration, have been observed in ${}^{194}$Tl. One of these bands has the characteristics of a magnetic rotational band. Cranked shell model calculations, using a deformed Woods-Saxon potential, have been performed to obtain the total Routhian surfaces in order to study the shapes of the bands and the band crossing in ${}^{194}$Tl. A semiclassical formalism has been used to describe the magnetic rotational band.

• Received 29 September 2011

DOI:https://doi.org/10.1103/PhysRevC.85.064313