Quadrupole Moments of First Excited States inSi28,S32, andAr40

Abstract

Static quadrupole moments of the first excited states of ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$, and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ have been measured using the reorientation effect in projectile Coulomb excitation. The results obtained are $Q({}_{}{}^{28}{}_{}{}^{}\mathrm{Si}, 2^{+})=+0.11\mathrm{}\pm 0.05$ b, $Q({}_{}{}^{32}{}_{}{}^{}\mathrm{S}, 2^{+})=-0.20\mathrm{}\pm 0.06$ b, and $Q({}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}, 2^{+})=+0.01\mathrm{}\pm 0.04$ b.