Systematic study of individual charge-changing cross sections of intermediate-energy secondary beams

Charge-changing interactions of stable and unstable medium-mass nuclides have been systematically investigated at intermediate energies. Secondary beams ranging from Ar to Ge isotopes produced by projectile fragmentation of ⁵⁶Fe and ⁷⁰Ge were irradiated onto a carbon target, and their total and partial charge-changing cross sections were precisely measured. A clear odd-even effect found in the partial charge-changing cross sections monotonically varies as a function of the Z/N ratio among the isotopes, and grows toward the neutron-deficient side. The total charge-changing cross sections are sensitive to the Z number of nuclides, and tend to gradually increase toward the neutron-deficient side in some isotopes.