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

The high-spin spectroscopy of ${}^{144}\mathrm{Tb}$ has been studied via ${}^{116}$Sn(${}^{32}S$, $3n1p$)${}^{144}\mathrm{Tb}$ fusion-evaporation reaction at a beam energy of 156 MeV. A dipole band built on the $\ensuremath{\pi}{h}_{11/2}^{3}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}^{\ensuremath{-}1}$ configuration is newly observed in ${}^{144}\mathrm{Tb}$. 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 ${}^{144}\mathrm{Tb}$ can be interpreted as a magnetic rotational band.