Abstract
A model is presented that mimics the nearest-neighbor-spacing (NNS) distribution of chaotic molecules such as ${\mathrm{Dy}}_{2}$ and ${\mathrm{Er}}_{2}$ just below their dissociation threshold. In this model the degree of chaos is controlled by choosing suitable Hamiltonian matrices from random ensembles. It is found that, in versions of the model that are not completely chaotic, the NNS of observable Fano-Feshbach resonances exhibits greater level repulsion, hence more chaos, than the corresponding NNS of a typical energy spectrum of the molecule at a fixed magnetic field.
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