Excitation of ⁸¹As by the ⁸²Se(t,α) reaction

The level structure of ⁸¹As is probed for the first time and many new states have been identified. Angular distributions were measured and compared with distorted-wave Born approximation calculations, in order to extract L values and spectroscopic factors. Most of the expected strength for pickup from the 2p and 1ƒ52 orbitals is observed. The level structure of ⁸¹As is fairly similar to that of ⁷⁹As but differs significantly from that of lighter As isotopes. NUCLEAR REACTIONS ⁸²Se(t,α)⁸¹As, E=18 MeV; measured σ(Eα,θ). As81 deduced levels, L, π, (J), spectroscopic factors. DWBA analysis. Enriched target.