Experimental study of multilpicity dependence of cumulative pion production in fragmentation of relativistic deuterons and carbon nuclei

4.5 x A GeV/c deuteron and carbon nucleus fragmentation into cumulative pions fas been measured on various target nuclei in the range of the scale variable within 0.6-1.6 corresponding to the region around the kinematical limit of free nucleon-nucleon collisions. The target nucleus atomic weight dependence significantly differs from the volume type dependence on the atomic weight previously established for a fragmenting nucleus. A weak multiplicity dependence of the target nucleus fragmentation supports the limiting fragmentation picture of the process. The investigation hes been performed at the Laboratory of High Energies, JINR. 13 refs., 11 figs