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Inelastic neutron scattering experiments on the Haldane-gap quantumantiferromagnet NDMAP are performed in magnetic fields below and above thecritical field Hc at which the gap closes. Quasi-elastic neutron scattering isfound for H>Hc indicating topological excitations in the high field phase.Comment: Added to discussion section. v2: Updated figure

Quasielastic Neutron Scattering in the High-Field Phase of a Haldane Antiferromagnet