Consider the wave (psi=A e^{i k r / r}+B e^{-i k r / r}), with (A, B=(2

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Consider the wave \(\psi=A e^{i k r / r}+B e^{-i k r / r}\), with \(A, B=(2 \pi / i k) \delta\left(\vec{n}_{k} \pm \vec{n}_{r}\right)+a, b\), where \

(a, b\) are real constants. Can it be understood as a scattering solution? If so, calculate the total cross section. What if \

(a, b\) are imaginary constants?

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