On the extraction of the nuclear twist in the (e,e') reaction

The contributions of the convection and spin components of the 2- state current transition densities to the (e,e') cross section at transferred momentum values qsub(eff) in the range 0 to 2.5 fm-1 are analysed in the DWBA for 90Zr and 208Pb. It is found that the convection component gives the main contribution to the cross section in the region qsub(eff) = 0.8 fm-1 for 90Zr and qsub(eff) = 0.6 fm-1 for 208Pb. Thus it is concluded that fragments of the 'nuclear twist' formed by the convection component were detected at Darmstadt in the (e,e') reaction on 208Pb. (author)