DEEP-INELASTIC ELECTROPRODUCTION OF NEUTRONS IN THE PROTON FRAGMENTATION REGION

Experiments at HERA looking for deep-inelastic electroproduction of ne utrons in the proton fragmentation region are in progress. They are ai med to measure the pion structure function at small Bjorken x. The imp ortant condition for such a study is to establish under what kinematic al conditions the dominance of the pion-pole graph in the process is g uaranteed. We analyse other sources of the leading neutron, in order t o figure out the kinematical region where the one-pion exchange domina tes.