Elastic electron scattering from the isotopes 36Ar and 40Ar

Abstract The charge structure of 36 Ar and 40 Ar has been investigated using the technique of elastic electron scattering. Data were collected at the National Bureau of Standards Linear Accelerator with incident electron energies ranging from 65 to 115 MeV and a scattering angle of 110°. The data span a range of q 2 between 0.29 and 0.92 fm −2 . Phase shift fits to a two-parameter Fermi distribution yield model dependent rms charge-radius values of 3.33 ±0.02 fm for 36 Ar and 3.39 ± 0.02 fm for 40 Ar, where the quoted uncertainties are statistical only. These values are compared with the results of previous experiments on these nuclei.