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The reactions of recoil  13 N atoms produced by the (n, 2n) reaction in sodium azide have been studied: labelled azide and nitrogen (N 2 ) are the principal products, with yields of about 30 and 65% respectively. The yield of azide shows little dependence on temperature. When samples of the irradiated salt are subjected to thermal decomposition, the specific activity of the nitrogen evolved first falls, then rises and shows a peak during the "induction period" for bulk decomposition. This behavior is interpreted in terms of displacement spike theory.

Hot-Atom Chemistry and Thermal Decomposition of Sodium Azide Crystals Containing Nitrogen-13 Recoil Atoms