“…Furthermore, from the analysis of the M1 form factor of electron elastic scattering on the nucleus 13 C [3 -11,14], it is followed that the 2p -shell is the most important one among the 2s -, 1d -, 2p -and 1f -shells. The similar conclusion regarding 2p -shell admixtures was obtained for the processes with pion [12,13,15]: pion photoproduction, radiative pion capture on 13 C and pion single charge exchage on 13 C.…”