Single-particle excitations and possible collective rotation in ${}_{207}\mathrm{Rn}$

Excited states of ${}_{207}\mathrm{Rn}$ have been investigated with the ${}_{197}\mathrm{Au}({}_{14}N, 4n){}_{207}\mathrm{Rn}$ reaction at a beam energies of 78 MeV. The level scheme of ${}_{207}\mathrm{Rn}$ was revised and expanded considerably by the $\gamma$ -$\gamma$ coincidence measurement. A large-scale shell-model calculation was performed for the purpose of improving the understanding of some levels of ${}_{207}\mathrm{Rn}$. A rotational-like band has been observed in ${}_{207}\mathrm{Rn}$ and the microscopic three-dimensional tilted axis cranking covariant density functional theory (3DTAC-CDFT) was applied to explain it. The calculated results indicate the weak oblate deformation and emergence of principal axis rotation for ${}_{207}\mathrm{Rn}$. This band is suggested to be a collective oblate band.