The low-lying rotational bands of the neutron-rich nucleus 172Tm

The microscopic mechanism of four experimentally observed bands in ¹⁷²Tm is investigated using the particle-number conserving method of the cranked shell model with monopole and quadrupole paring interactions. The experimental results, including the moments of inertia and angular momentum alignments of four bands in ¹⁷²Tm are reproduced well by the particle-number conserving calculations. The ω variation of the occupation probability of each cranked orbital and the contribution to moment of inertia from each cranked orbital are analyzed. Other unobserved low-lying bands of 2-quansiparticles in ¹⁷²Tm are predicted.