Abstract
High spin states of 157Er have been populated using the 114Cd+48Ca reaction at a 48Ca bombarding energy of 200 MeV. Gamma rays were detected in an array (TESSA2) of six escape-suppressed Ge spectrometers and a 50-element BGO multiplicity and summed energy detector. Decay scheme and angular correlation data were obtained from the gamma - gamma BGO coincidence data The yrast band has been identified up to 65/2+ and two negative parity sidebands have been identified (one previously unobserved) up to 69/2- and 63/2-. An additional sideband of six transitions was also observed. The band structures are interpreted in terms of quasiparticles in the framework of the cranked shell model.
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