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We study the ground state and low-energy excitations of fractional quantumHall systems on a disk at filling fraction $\nu = 5/2$, with Coulombinteraction and background confining potential. We find the Moore-Read groundstate is stable within a finite but narrow window in parameter space. Thecorresponding low-energy excitations contain a fermionic branch and a bosonicbranch, with widely different velocities. A short-range repulsive potential canstabilize a charge $+e/4$ quasihole at the center, leading to a different edgeexcitation spectrum due to the change of boundary conditions for Majoranafermions, clearly indicating the non-Abelian nature of the quasihole.Comment: 4 pages, 3 figures. New version shortened for PRL. Corrected typo

Edge Excitations and Non-Abelian Statistics in the Moore-Read State: A Numerical Study in the Presence of Coulomb Interaction and Edge Confinement