“…For pp, the information is obtained from atomic and annihilation experiments, as described in section 3. For heavier nuclei (D, He, Li) the data come from the atomic experiments [16,19,20], where the shifts and the widths of the 2P levels are measured directly. The experimental widths as well as the imaginary parts of the scattering volumes, calculated These values, as a function of the atomic weight, are presented in Fig.…”