Measurements of the Quadrupole Moments of the First $2^{+}$ States of ${}^{150}{Sm}$ and ${}^{194}{Pt}$ by the Reorientation Precession Technique

We have observed the influence of the nuclear quadrupole moment on the

γ

-ray angular correlation following Coulomb excitation by heavy ions scattered through angles of about 90°. A prolate quadrupole moment precesses the

γ

-particle correlation in the opposite direction to that produced by a moment of oblate shape. The method has been applied to the first

2^{+}

states of

{}^{150}{Sm}

and

{}^{194}{Pt}

, which are found to be prolate,

Q = - 1.25 \pm 0.2

b, and oblate,

Q = + 0.77 \pm 0.5

b, respectively.

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Measurements of the Quadrupole Moments of the First2+States ofSm150andPt194by the Reorientation Precession Technique