We have measured the nonelastic cross section σR for 40-MeV alpha particle for 19 target elements ranging in atomic, weight A between 9 and 232. The results have been compared with the predictions of the optical model σI. The ratio σRσI deviates from unity in a systematic fashion being less than 1 for the lightest elements and greater than 1 for the heaviest. Superimposed on this trend, σRσI dips by 18% for elements where the nuclear charge is near 28. A similar effect had been noted earlier in proton-reaction cross-section data but not in deuteron-reaction cross-section data.
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Igo et al. (1963) studied this question.
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