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We compare the West-Yennie method for the study of Coulomb-nuclear interference with a more accurate method based upon an exact solution for the phase shifts in the presence of nuclear and Coulomb interactions. Making use of nuclear amplitudes obtained in a previous study of pion- He 4 elastic scattering, we show that the West-Yennie method, originally proposed for the analysis of high-energy scattering, is of limited application at low and intermediate energies. In particular, the use of that method to determine the real part of the forward (nuclear) amplitude will lead to significant errors at low energies. NUCLEAR REACTIONS Coulomb-nuclear interference. Accuracy of the West-Yennie method at low energies.
Physical Review C – American Physical Society (APS)
Published: Mar 1, 1977
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