Quadrupole term

[fedra_moeykens]

With a smaller nuclear size, the quadrupole interaction plays a lesser role because the charge distribution can be more accurately approximated as a point charge. However, in the three graphs, the quadrupole term appears equally distant from E0, which is a result of the vertical axis scaling. By comparing the vertical axes, you can see that at 0.6 l/d, the scale differs significantly from that at 0.05 l/d. This difference demonstrates that at 0.05 l/d, the quadrupole contribution is indeed much smaller.

[fedra_moeykens]

Adding on that : This means that it’s not more accurate but just smaller : while on the graphs the smaller one looks more accurate.

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