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Inelastic ${}^{6}$Li scattering at 100 MeV/u on ${}^{12}$C and ${}^{93}$Nbhave been measured with the high-resolution magnetic spectrometer Grand Raiden.The magnetic-rigidity settings of the spectrometer covered excitation energiesfrom 10 to 40 MeV and scattering angles in the range $0^\circ <\theta_{\text{lab.}}< 2^\circ$. The isoscalar giant monopole resonance wasselectively excited in the present data. Measurements free of instrumentalbackground and the very favorable resonance-to-continuum ratio of ${}^{6}$Liscattering allowed for precise determination of the $E0$ strengths in${}^{12}$C and ${}^{93}$Nb. It was found that the monopole strength in${}^{12}$C exhausts $52 \pm 3^\text{(stat.)} \pm 8 ^\text{(sys.)}$\% of theenergy-weighted sum rule (EWSR), which is considerably higher than results fromprevious $\alpha$-scattering experiments. The monopole strength in ${}^{93}$Nbexhausts $92 \pm 4^\text{(stat.)} \pm 10 ^\text{(sys.)}$\% of the EWSR, and itis consistent with measurements of nuclei with mass number of $A\approx90$.Such comparison indicates that the isoscalar giant monopole resonancedistributions in these nuclei are very similar, and no influence due to nuclearstructure was observed.

Reexamination of $^{6}$Li scattering as a Probe to Investigate the Isoscalar Giant Resonances in Nuclei