First observation of band structure in As76 : Possible chirality and octupole correlations

High-spin states in 76As have been observed for the first time by using the 4He+74Ge reaction at beam energies of 58.6 and 62.6 MeV. Two positive-parity and three negative-parity bands have been found in 76As. The two positive-parity bands with πg9/2⊗νg9/2 configurations are tentatively interpreted as chiral doublet bands, which are supported by triaxial particle rotor model calculations. The electric dipole transitions linking the yrast positive- and negative-parity bands are also observed in this work, implying the possible presence of octupole correlations in 76As.Received 29 July 2023Accepted 23 February 2024DOI:https://doi.org/10.1103/PhysRevC.109.044303©2024 American Physical SocietyPhysics Subject Headings (PhySH)