Description of the Triaxial Strongly Deformed Bands in ^160,161Tm and ¹⁶³Tm

Properties of the triaxial strongly deformed (TSD) bands of ^160,161Tm and ¹⁶³Tm are investigated systematically within the supersymmetry scheme including many-body interactions and a perturbation possessing SO(5)(or SU(5)) symmetry on the rotational symmetry. Quantitatively good results of the γ-ray energies, the dynamical moments of inertia and the spin of the TSD bands in ^160,161Tm and ¹⁶³Tm are obtained. The calculation shows that competition between the pairing and anti-pairing effects exist in these TSD bands. Meanwhile, the SU(3) symmetry in TSD bands is broken more seriously than that in superdeformed bands.