Particle-Hole Induced Electric And Magnetic Rotation In In-111

The high-spin structure of In-111 has been investigated with gamma-ray spectroscopic methods using the Zr-96(F-19,4n) 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 g(7/2)(d(5/2)) and h(11/2) orbitals above the Z=50 spherical shell gap. The high-spin structure of In-111 also involves the recently discovered magnetic rotation mechanism which is manifest as high-spin Delta I=1 bands with no signature splitting and large B(M1) strengths, but only a small associated deformation. [S0556-2813(98)03604-8].