Single-particle Excitations and Possible Collective Rotation in Rn207

Excited states of 207Rn have been investigated with the 197Au(14N, 4n) 207Rn reaction at a beam energies of 78 MeV. The level scheme of 207Rn 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 207Rn. A rotational-like band has been observed in 207Rn 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 207Rn. This band is suggested to be a collective oblate band.