Inelastic electron scattering from low-lying states in the nuclei 36Ar and 40Ar☆

Abstract The low-lying level structure of 36 Ar and 40 Ar has been investigated using the technique of inelastic electron scattering. Data were collected at the National Bureau of Standards Linear Accelerator with incident electron energies between 65 and 115 MeV and scattering angles of 92.5° and 110°. The data span a range of momentum transfer squared between 0.29 and 0.92 fm −2 . Tassie model and Helm model analyses have been applied to data for levels at 1.97 and 4.18 MeV in 36 Ar and at 1.46, 2.52, 3.21 and 3.68 MeV in 40 Ar. A 2 + assignment to the 3.21 MeV state in 40 Ar is suggested. Transition strengths, transition radii, and mean lifetimes for these states are computed and compared with results of previous experiments.