Construction of an apparatus for studying the nuclear structure by electrons scattering. Application to charge density measurement in 58Ni

The 58Ni ground state was studied using electron elastic scattering. Experimental results on charge distribution are presented and briefly discussed in terms of nuclear structure in the framework of the Hartree-Fock approximation. The experimental part is described in details. The apparatus using the electron beam from the 600MeV Saclay Linac asked for the construction of a system of beam transport and analysis that defines the direction, identity and energy with a focalization on the target of a mobile spectrometer, and data analysis procedure. The spectrometer mobile around a vertical axis, with its shielding and detection system analyzes the scattered electron energy in an interval of 10% with a resolution of 2x10-4, and in direction from 25 deg to 155 deg in a solid angle of 5msr at maximum. The background rejection is such that cross sections of 10-38cm2 may be reached. The experimental procedure was completed, after data acquisition, by an analysis in view of obtaining a diffraction pattern-cross section plotting and a partial wave analysis giving the charge distribution in the nucleus