The perturbed gamma-gamma directional correlation of Cd(114)
Daubin, Scott C.
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The directional correlation of the 722 - 556 gamma-gamma cascade in Cd(114) was observed as a function of the physical and chemical state of the source. In the case of InCl(3) in a dilute aqueous solution of HCl it was deduced that the undisturbed correction was obtained, and the following values were found for the LaGendre expansion coefficients: A(2) = .090 +/- .011, A(4) = .022 +/_ .016. It was found that spin assignments of 2-2-0 for the first three levels of Cd(114) together with the assumption that the first transition is an Ml, E2 mixture with the following percentages: M1 - 95.8, E2 - 4.2 (both +/- .6) gave a good theoretical fit to the observed curve in general agreement with results of other workers. The lifetime of the first excited level in Cd(114) was measured and found to be less than or equal to 2.3 X 10(-10) seconds. To observe the disturbed correlation the state of the source was altered to include glycerin solutions of several viscosities, the dry salt of InCl(3), and frozen aqueous and glycerin solutions. Calculation of the magnitude of the correlation perturbing interaction was based on a theory due to Abragam and Pound. The liquid sources showed no spoilages within the range of viscosities to which the liquid theory applies; however, the dry salt showed an interaction of greater than or equal to 700 mcs on the assumption of an electric quadrupole interaction, and greater or equal to 163 mcs on the assumption of a magnetic interaction in classically describable fields. On the basis of field strength estimates in the former case, a lower limit to the quadrupole moment of the first excited state of Cd(114) is set at .21 X 10 (-24) cm(2).
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