FUTURE SEMIINCLUSIVE EXPERIMENTS WITH INTERNAL TARGETS

The physics prospects for semi-inclusive hadron production experiments in the deep-inelastic lepton scattering domain are discussed. It is a rgued that the luminosity that can be obtained with internal gaseous t argets at the HERA storage ring is sufficient to obtain quantitatively significant data on various physics subjects. Assuming that the HERME S spectrometer is used for such measurements, count-rate estimates hav e been evaluated for experiments on quark propagation in nuclei and ne utron structure functions with recoil detection. The physics potential of such measurements is further illustrated by the preliminary rho(0) -production data that were obtained during the first year of data taki ng at HERMES in 1995.