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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quadrupole angular distributions although we are not in disagreement with the 1=4 contributions, predicted by the shell model. 24 In addition, the sum of their differential cross sections equals that of the first 2+ in Cr 52 . As seen in Table III their B(E2)[ values are not equal to the Cr 52 state.It is interesting to note that the sum rule predicted by the weak-coupling model 25 holds even though the 24 H. O. Fimston, N. R. Robertson, and E. Rost, Phys. Rev. 134, B117 (1964). 25 A. de-Shalit, Phys. Rev. 122, 1530 (1961.

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States of 154 Er were studied by means of the ( le O,4n) and ( 64 Ni,4w) reactions. Beginning with a 40-nsec isomeric state [J* = (10~ ,11"")], an intensely populated unusual cascade of AJ=2 and AJ= 1 transitions was established up to spin (35,36) and 12.5 MeV excitation.On an E vs /(/+ 1) plot the yrast levels form a series of straight-line segments with side feeding occurring primarily at the ends of segments. A second cascade of even-spin, even-parity levels from the ground state to J* = 18 + (quasi-ground-state band) does not exhibit these properties.