High-spin states and band terminations in ⁶⁹As

Excited levels in ⁶⁹As were studied using the ⁴⁰Ca(³²S, 3p)⁶⁹ As reaction at 95 and 105 MeV beam energy. Gamma rays were detected with the EUROBALL spectrometer operated in conjunction with the Neutron Wall and the charged-particle detector array EUCLIDES. New level sequences with positive and negative paity were identified from 3p-γγ and γγγ coincidences. Spins were assigned to many of the levels on the basis of directional correlations of oriented states measurements. The previously observed positive-parity band was extended to spin 45/2⁺ and it was found to exhibit a crossing with another configuration identified up to spin 53/2⁺. Three negative-parity bands were observed for the first time up to spins (43/2^-), 39/2^-, and (41/2^-). The previously known band was extended to spin (49/2^-). No evidence for superdeformation was found, despite very high counting statistics. Configurations were assigned to each of the observed bands through comparisons to the cranked Nilsson-Strutunsky calculations.