The high-spin spectroscopy of ${}^{61}\mathrm{Ni}$ has been studied by the fusion-evaporation reaction ${}^{54}\mathrm{Cr}({}^{11}\mathrm{B},4n){}^{61}\mathrm{Ni}$ at a beam energy of 54 MeV. One dipole band and one quadrupole band in ${}^{61}\mathrm{Ni}$ are established for the first time. They can be respectively taken as candidates of magnetic and antimagnetic rotational bands based on the comparison with the well-known cases in ${}^{110}\mathrm{Cd}$ and the calculations of the classical particles-plus-rotor model. These two new bands are further investigated by the microscopic tilted axis cranking covariant density functional theory with configurations $\pi \left[{\left(1f_{7/2}\right)}^{-1}{\left(fp\right)}^1\right]\otimes \nu \left[{\left(1g_{9/2}\right)}^1{\left(fp\right)}^4\right]$ and $\pi \left[{\left(1f_{7/2}\right)}^{-2}{\left(fp\right)}^2\right]\otimes \nu \left[{\left(1g_{9/2}\right)}^1{\left(fp\right)}^4\right]$, respectively, and good agreement between experiment and calculation is obtained. By examining the angular-momentum coupling, the dipole band is characterized by the shears mechanism whereas the quadrupole band is characterized by the two-shears-like mechanism. This study provides evidence for possible coexistence of magnetic and antimagnetic rotations in the $A\approx 60$ mass region.

The spectroscopy of ${}^{79}\mathrm{Se}$ is studied via the ${}^{82}\mathrm{Se}(\alpha$, $\alpha 3n$)${}^{79}\mathrm{Se}$ fusion-evaporation reaction. A negative-parity magnetic dipole band in ${}^{79}\mathrm{Se}$ is established for the first time. Based on the calculations by the self-consistent tilted axis cranking covariant density functional theory, this new dipole band can be classified as a “stapler” band, which has a relatively stable symmetric prolate deformation as a function of rotational frequency. Hence, it is demonstrated that the stapler bands exist not only in the oblate and triaxial nuclei, but also in prolate nuclei. By examining the angular momentum coupling, it is found that the five valence nucleons in the high-$j$ orbitals play a major role in the closing of the stapler.