Abstract
Abstract Heavy dark-matter particles may transfer significant amounts of momentum in collisions with detector nuclei. Both spin-independent and spin-dependent cross sections are modified at high q by form factors that reflect the spatial distribution of nucleons inside the nucleus. While spin-independent form factors are simply related to nuclear densities, spin-dependent form factors reflect delicate aspects of nucleonic and nuclear structure. I derive the relation between these form factors and ground state wave-functions, and describe their calculation in some nuclei of experimental interest. The spin-dependent form factors always have longer tails than those associated with spin-independent scattering.
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