Abstract
The acoustic scattering from an elastic spherical shell in a homogeneous, range-independent waveguide is studied. New phenomena are observed that have no counterpart in free-field scattering. First, the free-field resonance spectrum exhibits fine structure, that is, the lth resonance splits into (l+1) distinct components. This splitting is most pronounced near the waveguide boundaries. Second, ‘‘superresonances’’ are observed. It is found that at certain water column heights and scatterer depths, significant enhancements of the resonance strength occur. In some cases, more than 100-fold enhancement is observed.
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