Influence oflForbiddenness on the 82-kev Transition inCs133

The gamma-gamma directional correlation of the 356-82-kev cascade in

{Cs}^{133}

was measured. The directional correlation coefficients were

\frac{A_{2}}{A_{0}} = 0.031 \pm 0.006

and

\frac{A_{4}}{A_{0}} = - 0.006 \pm 0.010

. This is consistent with a spin assignment

\frac{1}{2} (Q) \frac{5}{2} (D + Q) \frac{7}{2}

. The ratio of the

E 2

M 1

matrix elements for the 82-kev transition is

δ = - 0.139 \pm 0.007

. The

M 1

transition is retarded by a factor of ∼700 and the

E 2

transition is enhanced by a factor of ∼20, compared to single particle transitions. The retardation of the

M 1

transition is consistent with the assignment

d \frac{5}{2}

for the 82-kev state and

g \frac{7}{2}

for the ground state which would make the

M 1

transition

l

forbidden. The enhancement of the

E 2

transition indicates there is a cooperative phenomenon present.

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