Neutron rich nucleon flow in central heavy ion collisions

Abstract In reactions of 1.2 GeV 208 Pb ions with 110 Pd nuclei, mass, charge, and energy of the products were measured at various angles. Transfers up to 50 nucleons connected with very low excitation energies of the fragments were observed especially for reactions leading to large mass asymmetry. For central collisions the neutron to proton ratio of the nucleon flow has the unusually high value of 2.5.