Vol. 75 bility of the tagged atom reacting with radicals which it has formed in losing its recoil energy.Alternative Theory of Product Formation Following (n,y) Activation.-Friedman and Libby and Fox and Libby11 have interpreted their important data on the products of the (n,y) reaction of bromine in liquid and solid propyl bromides to indicate that the parent molecule is the favored product when bonds are broken by high energy bromine atoms, and other products are favored when bonds are broken by recoiling atoms with energies only a few times greater than bond energies ("epithermal" energy range). We feel that there are a variety of theoretical reasons and types of experimental evidence which preclude the possibility that this subdivision of reaction probability which they have outlined is generally applicable. Some of these have been discussed earlier.7 They include a consideration of: (1) the differences in collisions and in fragmentation probability in condensed phases as compared to the gas phase;(2) the low probability of "head-on" collisions in which a recoil atom can (11) (a) L, Friedman and W. F.
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