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It is shown that the derivative of the scattering phase shift with respect to energy, dηdE, must exceed a certain limit if the interaction of scattered particle and scatterer vanishes beyond a certain distance. This limitation of dηdE is, fundamentally, a consequence of the principle of causality; it is derived, however, from a property of the derivative matrix R.
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E. P. Wigner (1955) studied this question.
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