Gamma-Gamma Angular Correlation inSr88

The directional angular correlation of the 909-1850-kev $\gamma -\gamma$ cascade in ${\mathrm{Sr}}^{88}$ has been measured with a coincidence scintillation spectrometer using NaI detectors. For a dilute Y${\mathrm{Cl}}_3$ aqueous solution source, the observed correlation function, after correction for the finite angular resolution of the detectors, is given by $W\left(\theta \right)=1-(0.0699\mathrm{}\pm 0.0025)P_2\left(cos\theta \right)$. The theoretical correlation function for the sequence $3\left(D\right)2\left(Q\right)0$ is $W\left(\theta \right)=1-0.07143\mathrm{}{P}_2\left(cos\theta \right)$; hence it is concluded that both of the transitions in the cascade are pure multipoles.