that it will be necessary to include contributions from other fundamental nuclear processes such as compound nucleus formation. At present it is not clear how the compound-nucleus and stripping processes interfere. In the case of (d,t) reaction one would expect a very small contribution from the compound-nucleus process, since in order for this process to contribute to the reaction, it would require the simultaneous appearance of two neutrons and a proton at the nuclear surface, all with sufficient energy to escape.

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Half-life values have been obtained for Cs139 and Cs140 by extraction of the Ba descendent activities from cesium silicotungstate precipitates. The half-life of Cs139 was found to be 9.5±0.2 min. by this technique and that of Cs140, 66±2 sec. The value for the Cs139 half-life was confirmed by observation of a Cs sample isolated directly from irradiated uranyl nitrate.

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