Abstract
A relativistically exact equation is derived for the scattering angle at which ions elastically scattered from one kind of nuclei have the same energy as they do when inelastically scattered from heavier nuclei. Tables are presented for protons, deuterons, and alpha particles using the 4.433‐ and 9.629‐MeV levels of 12C. The tables include incident energies from approximately 5 to 60 MeV.

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