Nuclear charge radii of Al and Si from elastic electron scattering between 25 and 60 MeV

Abstract

Elastic electron scattering cross sections of27Al and Si (natural isotopic mixture) have been measured relative to carbon. The rms charge radiiR m , deduced with partial wave calculations, are (3.01±0.05) fm for27Al and (3.06±0.05) fm for Si, in good agreement with results from muonic X-ray energies. The values given are those for a Fermi charge distribution with skin thickness 2.5 fm; harmonic oscillator shell model distributions yield radii smaller by 0.03 fm. The ratioR m (27Al)/Rm(Si) is 0.984±0.016.