  Non-relativistic effective field theory (NREFT) is one approach used for
describing the interaction of WIMPs with ordinary matter. Among other factors,
these interactions are expected to be affected by the structure of the atomic
nuclei in the target. The sensitivity of the nuclear response components of the
WIMP-nucleus scattering amplitude is investigated using shell model
calculations for $^{19}$F and $^{nat}$Xe. Resulting integrated nuclear response
values are shown to be sensitive to some specifics of the nuclear structure
calculations.
