DEEP-INELASTIC LEPTON SCATTERING IN NUCLEI AT X-GREATER-THAN-1 AND THE NUCLEON SPECTRAL-FUNCTION

The nuclear structure function F-2A (I) has been studied in the Bjorke n limit for (l, l') scattering on nuclei in the region of x >1 and was found to be very sensitive to the information contained in the nucleo n spectral function in nuclei, particularly the correlations between m omenta and energies in the region of large momenta. Calculations were done in a local density approximation using two different spectral Fun ctions for nuclear matter. Results are compared to those obtained for a spectral function which has been evaluated directly for the finite n ucleus, O-16, under consideration. For values of x around 1.5 and larg er the quasiparticle contribution is negligible, thus stressing the se nsitivity of the present reaction to the dynamical properties of nucle i beyond the shell model approach. Several approximations which are us ually employed in studies of the EMC effect have been analyzed and the ir inaccuracy in this region is demonstrated. The results stress the f act that the nuclear structure function contains important information on nuclear dynamical correlations. Therefore further measurements of F-2A(x) in that region and for many nuclei would be most welcome.