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States of ' Tl, populated through the '"Pt ('Li, 4n) reaction at E = 30 to 40 MeV, were studied using in-beam yray spectroscopy techniques. An almost completely new level scheme is presented comprising the eh 9/2 vi 13/2 twoquasiparticle band which in this case is built on an I = 7 isomeric state (Ti/, = 4.8~0.2 ns) in contrast to I = 8 for all the lighter doubly odd Tl isotopes studied up to now. The systematic variation of the odd-even staggering present in these bands ofFers arguments to support the interpretation that this phenomenon is related to the signature dependence of the Coriolis interaction.NUCLEAR REACTIONS 9 Pt( Li, 4n), E = 30-40 MeV, measured Ez, I&, o. (E&. , E, 8~~-~col+.~1. deduced levels,~, 7t'~i~2 Ge (Li. ) target.

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Isomeric transitions, of E3, M2, smdEl/M2 character, depopulating nh d / 2 ® Pi 13 / 2 bands in 186,188,190 T^ respectively, have been found with use of y-ray spectroscopic techniques. The changes in multipolarity reflect successive changes in the bandhead spin values corresponding to level crossings within the ftfc 9 / 2 ® vi 13/ 2 system. These crossings were predicted in the framework of the two-quasiparticle plus rotor model and interpreted as a direct consequence of the depletion of the i 13 / 2 shell.