PROTON TOTAL REACTION CROSS-SECTION MEASUREMENTS FOR CA-40, CA-44, CA-48 AT 700 MEV

Proton total reaction cross sections for 700 MeV protons on Ca40,44,48 have been measured by detecting inelastically scattered particles at angles greater than 10°(lab). The measurements were performed with overall uncertainties of ±6.2% and relative uncertainties of ±2.5%. These measurements yield the values of σR(Ca40)=614 mb, σR(Ca44)=643 mb, and σR(Ca48)=736 mb. Matter radii differences Δ(44-40)=(0.05±0.09)fm and Δ(48-40)=(0.36±0.09)fm were extracted based on a theoretical calculation which takes advantage of the geometrical nature of the cross section. The results are compared to other available measurements of total reaction cross sections on medium-weight nuclei at medium energies and to other determinations of the matter radii differences for the calcium isotopes. NUCLEAR STRUCTURE Ca40,44,48; measured proton total reaction cross sections, E=700 MeV. Deduced matter radii differences. © 1979 The American Physical Society.