High-spin states and band terminations inAs69

Excited levels in ${}^{69}\mathrm{As}$ were studied using the ${}^{40}\mathrm{Ca}({}^{32}\mathrm{S},3p){}^{69}\mathrm{As}$ 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 parity were identified from $3p\text{−}\gamma \gamma$ and $\gamma \gamma \gamma$ 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-Strutinsky calculations.