Inelastic scattering of 110 MeV ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ particles is used to probe the quadrupole strength in the even Mo isotopes. The peak position of the giant quadrupole resonance is found to decrease more rapidly than predicted by the $A^{-\frac{1}{3}}$ law, a behavior very similar to that exhibited by the photonuclear giant dipole resonance. The width and strength of the giant quadrupole resonance are practically constant in ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$ through ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$.

NUCLEAR REACTIONS ${}_{}{}^{100,98,96,94,92}{}_{}{}^{}\mathrm{Mo}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$′), $E=110\mathrm{}$ MeV: Measured $\sigma (E,\theta )$. Position, width, and strength of the giant quadrupole resonance deduced.

• Received 28 February 1979

DOI:https://doi.org/10.1103/PhysRevC.20.1593