High spin spectroscopy of124Ba andh 11/2 neutron alignment

The level scheme of the yrast band of124Ba has been extended up to spin 32ħ. Transitions in the two negative parity side bands are observed up to spin 27ħ and tentatively 20ħ. The second backbend observed in the S-band and the backbends in the side bands are explained as due to neutrons. The structure of the sidebands is discussed and compared with deformation self-consistent calculations, Total Routhian Surfaces (TRS).