Structure of excited bands in ¹⁶²Tm and residual interactions

The nucleus ¹⁶²Tm has been populated by the ¹³⁰Te(³⁷Cl,5n) reaction, and the γ-cascades detected with the NORDBALL array. Eight coupled rotational bands involving the proton orbitals, g_7/2[404]7/2⁺, d_3/2[411]1/2⁺, d_5/2[402]5/2⁺, h_11/2[523]7/2^- and h_9/2[541]1/2^- and neutron orbitals i_13/2[642]5/2⁺, h_9/2[523]5/2^- and f_7/2[521]3/2^- have been established in ¹⁶²Tm, to spins varying from 18 to 47(latin small letter h with stroke)sign. Various phenomena which can be related to residual neutron-proton interactions are discussed. In particular, signature inversion in the π[541]1/2^- ⊗ ν[642]5/2⁺ bands based on the h_9/2 quasiproton and i_13/2 quasineutron, respectively, may be explained by a fairly large p-n interaction. In addition, interactions at the crossings of bands with constituent quasiparticles differing both in parity and signature have been extracted with strength of the order of a few (4-12) keV. Such interactions also require terms beyond the standard mean field description.