Beta-Gamma Directional Correlation in the Decay ofEu152

The directional correlation between the 1459-kev beta group and the 345-kev gamma ray of ${\mathrm{Eu}}^{152}$ has been measured as a function of beta energy at energies above 800 kev. The experimental results show good agreement, at high energies, with the theoretical correlation for a first forbidden beta transition with $\Delta J=1\mathrm{}$. The influence of the relative size of the matrix elements on the shape of the beta spectrum is discussed.