High spin band structures in doubly odd 194Tl

The high spin states in the odd-odd Tl-194 nucleus have been studied by populating them using the Re-185,Re-187(C-13, 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 Tl-194 has been extended up to 4.1 MeV in excitation energy and includes 19 new gamma-ray transitions. The pi h(9/2) circle times 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 Tl-194. 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 Tl-194. A semiclassical formalism has been used to describe the magnetic rotational band.