from toy model to quantum

[Yaxi Li]

If the truncation after the quadrupole term is shown to give better results when the nucleus is smaller, this could be misleading. The reason is that the quadrupole term itself becomes smaller, not because truncating higher-order terms improves the approximation, but because the underlying charge distribution is becoming more symmetric as the nucleus gets smaller. Therefore, truncating after the quadrupole term may seem like a good choice, but this is really a result of the quadrupole term weakening, not an improvement in the truncation strategy.

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