Particle-hole induced electric and magnetic rotation in111In

The high-spin structure of ${}^{111}$In has been investigated with $\ensuremath{\gamma}$-ray spectroscopic methods using the ${}^{96}$Zr${(}^{19}$F,4$n)$ reaction with thin and backed targets. A comprehensive level scheme has been constructed which exhibits interesting collective as well as novel single-particle excitations. Unambiguous evidence of proton particle-hole excitations is found for the first time in a $Zl$50 nucleus in the form of decoupled bands involving proton ${g}_{7/2}{(d}_{5/2})$ and ${h}_{11/2}$ orbitals above the $Z$=50 spherical shell gap. The high-spin structure of ${}^{111}$In also involves the recently discovered magnetic rotation mechanism which is manifest as high-spin $\ensuremath{\Delta}I$=1 bands with no signature splitting and large $B(M1)$ strengths, but only a small associated deformation.