Determination of the Quadrupole Moments of First Excited2+States inCd114andFe56by Coulomb Excitation

Abstract

The differential Coulomb-excitation probability for the 0.558-MeV $2^{+}$ excited state in ${\mathrm{Cd}}^{114}$ and for the 0.847-MeV $2^{+}$ excited state in ${\mathrm{Fe}}^{56}$ have been measured by Coulomb exciting with ${\mathrm{O}}^{16}$ ions of 25- and 30-MeV incident energy. Inelastically scattered ions were separated from ions scattered elastically by requiring a coincidence with a deexcitation $\gamma$ ray detected in a large scintillator placed close to the target. The differential excitation probability was interpreted in terms of the reorientation effect to yield the static electric quadrupole moments for the 0.558-MeV $2^{+}$ state in ${\mathrm{Cd}}^{114}$, $Q_{22}=-0.64\mathrm{}\pm 0.19\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, and for the 0.847-MeV $2^{+}$ state in ${\mathrm{Fe}}^{56}$, $Q_{22}=-0.345\mathrm{}\pm 0.054\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$.