Magnetic rotation in the105Sn nucleus

The structure of ${}^{105}$Sn has been investigated through the ${}^{50}$Cr${(}^{58}$Ni,2pn) reaction at a beam energy of 210 MeV. In addition to an extension of the spherical level scheme a regular sequence of dipole transitions has been found. The states of the dipole band are suggested to be built on a neutron $h_{11/2}^2$ excitation coupled to proton particle-hole states, which polarize the core to a slightly prolate shape. The experimental results are in agreement with the prediction of tilted axis cranking calculations, which satisfactorily explain the properties of the band.