The quadrupole moment of the first excited state of18O

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Abstract
Using the re-orientation effect in Coulomb excitation, the quadrupole moment, Q2+, of the first excited state of 18O is found to be -0.100+or-0.030 eb. The analysis assumes, on the basis of previous measurements, that B(E2; 0+ to 2+)=0.0044+or-0.0004 e2b2. A correction (+0.032 eb) for the effect of the giant dipole resonance, based on the hydrodynamic model, has been applied. Evidence is presented that some other determinations of Q2, were performed at too high a bombarding energy. The present value for Q2+ is smaller in magnitude than that reported by Kleinfeld et al. (1975) but remains larger than the value of -0.034 eb predicted by a recent shell-model calculation.