Deformed negative-parity excitations in 71 As

High-spin states in the neutron-deficient 71As nucleus have been studied using in-beam g -ray spectroscopic techniques combined with mass identification. A new decay sequence of negative parity has been assigned to 71As and previously known sequences have been extended to higher spin and excitation. The new sequence has been identified as originating from the proton f 7/2 extruder orbital, which approaches the Fermi surface at large prolate deformations. Comparisons of experimental B(M1)/B(E2) ratios to theoretical expectations support this interpretation.