Abstract
The directional correlations for the 174 keV-beta and the 208 keV-gamma cascade and for the 384 keV-beta and the 113 keV-gamma cascade in the decay of Lu177 have been measured as a function of the energy of the beta-particles. A magnetic lens spectrometer was used to select the energy of the beta-rays. For the first cascade the observed correlation is isotropic. For the 384 keV-beta and the 113 keV-gamma cascade, the anisotropy factorA 2(W) in the beta-gamma directional correlation $$W_{\beta _\gamma } (\vartheta ,W) = 1 + A_2 (W)P_2 (\cos \vartheta )$$ is proportional toP 2/W and its value isA 2 (1.48)=+0.0575±0.0068. The analysis of the data shows that theξ-approximation for first-forbidden nonunique beta transitions represents the results of the 384 keV-beta and the 113 keV-gamma cascade in a very satisfactory manner.
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