The ground state geometry, electronic structure, and the various spin states of a Ni_13 cluster have been investigated using a linear combination of atomic orbitals - molecular orbital approach within a density functional scheme. The ground state is found to be a be a slightly distorted icosahedron. The moment is 0.61 mu_B per atom which is nearly same as in bluk Ni. The cluster therefore lacks any moment enhancement due to the surface. The reasons for this low moment are discussed and the theoretical findings are compared with recent experiments.
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