ON THE QUENCHING OF THE (E, E') FORM-FACTOR OF THE M1 TRANSITION TO THE 10.23 MEV STATE IN 48CA

The form factor of the process (e, e') 48Ca (1+; 10.23 MeV) is analyzed in the framework of the random-phase approximation. As in previous calculations the obtained wavefunction is dominated by the neutronic (1f(5/2)1f7/2(-1)) particle-hole configuration, but it is shown that the role of the small (non-dominant) components is not negligible. A quenching factor independent of the momentum transfer is found. The effect of the meson-exchange currents is also considered. Experimental data can be explained by the additional consideration of second order core polarization and tensor correlations effects.