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The angular and energy distributions of the fast charged particles emerging from nuclei bombarded by 90-Mev neutrons have been investigated. The results indicate that the nature of the collision process is determined predominantly by interactions of the bombarding particle with single nucleons rather than with the struck nucleus as a whole: angular distributions are found to be peaked in the forward direction for all emergent particles, the degree of peaking increasing with energy. Deuterons are found to be more concentrated in the forward direction than are protons. In the case of carbon, particles traveling in the forward direction with energies greater than 20 Mev consist of 60 percent protons, 36 percent deuterons, and about 4 percent tritons.

750R. M. STERNHEIMER excitation of electron 1 into higher p states, while S\ and d\ are s and d functions, respectively, which describe the excitation of electron 2. The first-order overlap SE^i does not contribute to q' because so(l) is orthogonal to pi{\) and ^'i(l), and similarly po(2) is orthogonal to Si(2) and d\{2). However, \Fi 2 contributes three second-order terms to q f which arise from |j>i(l)] 2 , [j>'i(l)] 2 , and E^i(2)] 2 . Second-order terms of the type ^i 2 are also obtained from the simultaneous Pi m excitation of a core electron in a p state and the valence electron. A similar class of terms is obtained using the P 2 m part of e 2 /r 12 . These terms were not evaluated because of the difficulty of determining the functions of type pi, s h p f h and d\. Thus pi and Si satisfy a set of two simultaneous differential equations. The same applies for p\ and d\.. The numerical solution of these sets would be much more complicated than the solution of Eqs. (5A) and (24A) which involve a single unknown function. However, there seems to be no reason to believe that the two-electron terms would be appreciably larger than the one-electron excitation terms which were shown to be verv small for the case of CI.Measurements have been made of the (d,2n) cross sections of the nuclear species Ti 48 , Cr 52 , and Fe 56 . Results are given for incident deuterons in the energy region 1-20 Mev.

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