Scattering of Weakly Interacting Massive Particles from 73 Ge Typeset Using Revt E X

We use a " hybrid " method, mixing variationally-determined triaxial nuclear Slater determinants, to calculate the response of 73 Ge to hypothetical dark-matter particles such as neutralinos. The method is a hybrid in that rota-tional invariance is approximately restored prior to variation and then fully restored before the mixing of intrinsic states. We discuss such features of 73 Ge as shape coexistence and triaxiality, and their effects on spin-dependent neutralino cross sections. Our calculations yield a satisfactory quadrupole moment and an accurate magnetic moment in this very complicated nucleus, suggesting that the spin structure and thus the axial–vector response to dark matter particles is modeled well.