Abstract
The angular correlation of the cascade in 99Mo decay was studied with a fast-slow scintillation spectrometer in the beta energy region 450-700 kev. A small negative beta-gamma anisotropy is observed and the resulting angular correlation function (W) is found to lie in between -0·023 and -0·034 with an uncertainty of about 25%. It is concluded that the results are in accordance with the ξ approximation applicable to certain non-unique first-forbidden beta transitions.
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