  The isoscalar giant monopole resonance (GMR) has been investigated in a
series of Sn isotopes (A=112--124) using inelstic scattering of 400-MeV alpha
particles at extremely forward angles (including 0deg). The primary aim of the
investigation has been to explore the role of the "symmetry-energy" term in the
expression for nuclear incompressibility. It is found that the energies of the
GMR in the Sn isotopes are significantly lower than those expected from the
nuclear incompressibility previously extracted from the available data on the
compressional-mode giant resonances.
