complications multipole expansion

[fedra_moeykens]

-It would be nearly impossible to solve it without multipole expansion due to the complexity of the potential. – A multipole expansion simplifies complex nuclear shapes by breaking them into smaller, manageable terms, but it only works well if higher-order terms shrink quickly, ensuring the expansion converges. Perturbation theory applies when the unperturbed system’s solutions are known, and both methods are valid together if the nucleus’s deformation is small compared to its distance from the electron.

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