INDIVIDUAL ISOTOPIC FRAGMENTATION CROSS-SECTIONS OF RELATIVISTIC NUCLEI IN HYDROGEN, HELIUM, AND CARBON TARGETS

In this paper, the third in a series of papers, we discuss isotopic fragmentation cross sections measured in hydrogen, helium, and carbon targets. Over 300 of these cross sections have been measured in 24 separate runs using 12 charges from C12 to Ni58. Most of these isotope cross sections were measured at an energy 600 MeV/nucleon, however, some measurements of the Fe56 fragmentation are available at an energy 1 GeV/nucleon. We observe, comparing both these data and other data, that to first order, the mass fractions for each isotope are essentially independent of energy. This indicates that the energy dependence of the isotopic cross sections is essentially the same as for the charge changing cross sections. It is also observed that the isotopic mass fractions and the width of the mass distributions for each charge are essentially independent of the H, He, and C targets involved. These systematics greatly simplify the construction of a semiempirical formula to describe these cross sections. New isotopic cross sections are presented for a number of interesting reactions, 12C'Be, 16O'N, 27Al'Na, and Fe56 into Mn and Ar among others. A large body of new data on proton and neutron stripping reactions are also presented and discussed. © 1990 The American Physical Society.