High Spin States In Odd-Odd Tm-160 Nucleus

High-spin states of Tm-160 are studied by the Nd-146(F-19, 5n) reaction at a beam energy of 102 MeV. The previously known pi h(11/2) circle plus vi(13/2) yrast band and pi h(11/2) circle plus vh(9/2) side band are confirmed. The level scheme is enriched and more low-lying levels are observed. A new side band is observed and assigned as the favoured signature partner of pi d(3/2) circle plus vi(13/2). The spin of this band is assigned with the energy level systematics. It is pointed out that the B(M1)/B(E2) ratios increase rapidly at the high frequency approaching the second crossing in the pi h(11/2) circle plus vi(13/2) band, which is closely related to the alignment gain of the aligned i(13/2) quasineutron.