High-spin spectroscopy of 144Tb: Systematic investigation of dipole bands in N =79 isotones

The high-spin spectroscopy of ¹⁴⁴Tb has been studied via ¹¹⁶Sn(³²S, 3n1p)¹⁴⁴Tb fusion-evaporation reaction at a beam energy of 156 MeV. A dipole band built on the πh11/23⊗νh11/2-1 configuration is newly observed in ¹⁴⁴Tb. Together with similar observation in neighboring nuclei, the properties of dipole bands in N =79 isotones are investigated in terms of the self-consistent tilted-axis-cranking covariant density functional theory. Based on systematic comparison and examination of the shears mechanism, the dipole band in ¹⁴⁴Tb can be interpreted as a magnetic rotational band.