Study oF π+ AND π− elastic scattering from 40Ca and 48Ca in the region of the πN(3, 3) resonance

Abstract Angular distributions for elastic scattering from 40 Ca and 48 Ca with π + and π − beams were measured at 130, 180 and 230 MeV. A neutron-proton rms radius difference in 48 Ca of 0.20 ± 0.05 fm was obtained at 180 MeV within the eikonal framework.