Based on the arguments of excitation energy systematics andalignmentadditivity rule, the spins of the lowest observd states of the (h11/2)p(i13/2)n bands in 156Tb, 1458Ho, 166 Lu, and 168 Ta are assigned as 8, 9, 8, and 9 instead of the previous assignments of 6, 6, 7, and 10, respectivly. Taking these new spin assigmentsand the preliminary experimnental results of 162, 164 Lu into account, the systematic features of the signature inversion of the (h11/2)p (i13/2)n bands of the doubly odd nuclei in the lighter rate-earth region (around A～160) are presented.

High-spin states of 160Lu have been studied through the 144Sm(19F, 3n) reaction. The previously known πh11/2 ⊗ υi13/2 yrast band is extended from Iπ=21−to 25−and a four quasiparticle band with configuration πh11/2[523]7/2− ⊗ υh9/2[521]3/2− ⊗ (υi13/2)2 is reported.

The level states of the nucleus 124Cs have been populated through the 116Sn(11B,3n) reaction at a beam energy of 45 MeV, provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy. A number of low-lying states are constructed. The level states in the πh11/2 ⊗vg7/2 side band are extended down to lower spin by one h. The level energies and spins in the rotational bands are determined through the establishment of various connections, which con rm the spin assignment of the yrast band in 124Cs based on excitation energy systematics. It is revealed that with the present spin assignment, the πh11/2 ⊗vg7/2 side band shows signature inversion at low-spin region and the inversion occurs at a spin of about 16h.

High spin states of 122Cs are reinvestigated through the 116Sn (10,B 4n) 122Cs reaction at the beam energy of 54 MeV. Two new levels are added to the lower side of the most strongly populated band and the previously proposed 488 keV linking transition between the two observed bands is replaced by the 95 keV linking transition. As a result of these newobservations, it becomes reasonable to assign the most strongly populated band in 122Cs as the πh11/2⊗vh11/2 yrast band.

High spin states of odd-odd nucleus 124Cs have been studied following the 116Sn(11B,3n) reaction at a beam energy of 45 MeV. The previously reported isolated rotational bands are connected to each other by various linking transitions and to the 11 ground state through different decay paths. The spin of the lowest observed state in the ph11/2⊗ vh11/2 yrast band is determined to be 9\, which is two units larger than that suggested by the latest in-beam study and confirms the spin assignment proposed by a recent systematics study on spin assignment and signature inversion of the ph11/2⊗ vh11/2 bands in odd-odd isotopes 118-132Cs.