Abstract
Transformations of nucleon-nucleon amplitudes from the center of mass frame to the proton-nucleus Breit frame are developed for use in multiple scattering analyses. As a by product, a matrix equation is given for the invariant $\mathrm{NN}$ amplitudes in Dirac spinor representation. Based on recent $\mathrm{NN}$ phase shifts, Gaussian parametrization of the $\mathrm{pp}$ and $\mathrm{np}$ amplitudes are calculated and some proton-nucleus calculations are presented to illustrate the effects of the Breit frame amplitudes. For $^{40}\mathrm{Ca}$, these effects are quite small.NUCLEAR REACTIONS Nucleon-nucleon amplitudes, impulse approximation, Breit frame, Wigner rotation, Dirac invariant amplitudes, proton-nucleus elastic scattering.
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