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The low-lying neutral excitation spectrum of the incompressible quantum Hallfluid at $\nu=5/2$ is investigated by inelastic light scattering. Gapped modesare observable only in a very narrow filling factor range centered at 5/2 atenergies that overlap estimates from transport activation gaps. The modes areinterpreted as critical points in the wave-vector dispersion of excitationsthat preserve spin orientation. For very small changes $|\delta\nu|\lesssim0.01$ the gapped modes disappear and a continuum of low-lying excitations takesover indicating the transition from an incompressible fluid at 5/2 to acompressible state. Observations of spin wave modes indicate spin polarizationof the 5/2 and 2+1/3 quantum Hall fluids.

Experimental evidence of low-lying gapped excitations in the quantum fluid at nu=5/2