Particle-hole induced electric and magnetic rotation in 111In

The high-spin structure of 111In has been investigated with γ-ray spectroscopic methods using the 96Zr(19F,4n) 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 Z<50 nucleus in the form of decoupled bands involving proton g7/2(d5/2) and h11/2 orbitals above the Z=50 spherical shell gap. The high-spin structure of 111In also involves the recently discovered magnetic rotation mechanism which is manifest as high-spin ΔI=1 bands with no signature splitting and large B(M1) strengths, but only a small associated deformation.