Missing Isoscalar Monopole Strength in58Ni

Abstract
The giant resonance region in 58Ni was studied with inelastic scattering of 240 MeV α particles at small angles including 0°. It is shown that the total isoscalar monopole strength in the region Ex=12 to 25 MeV is <50% of the E0 energy-weighted sum rule, and that the centroid of the E0 strength EGMR>24.8MeV in contrast to the EGMR17MeV expected from systematics of other nuclei. If there is similar unobserved E0 strength in other nuclei, EGMR for those nuclei may be significantly different from those used to extract nuclear matter incompressibility.

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