Abstract
Cross sections for the production of Be/sup 7/ in the helium ion bombardment of Mg, Al, Ti, Co, and Cu were measured in the 30- to 42-Mev energy range. The excitation functions for these reactions are presented. A study of the bulk (0 to 90 deg; 90 to 180 deg) laboratory angular distributions, by the catcher foil technique, of the Be/sup 7/ nuclei emerging from 2.0 and 1.85 mg/cm/ sup 2/ magnesium targets and an examination of the approximate range-energy curves for the Be/sup 7/ particles in aluminum and magnesium indicated that the reaction proceeds through a compound nucleus. The experimental excitation function for the Al/sup 27/(He/sup 4/,Be/sup 7/) Na/sup 24/ reaction was compared with calculations based on the nuclear evaporation model. The cross sections for the production of Na/sup 24/ and Be/sup 7/ in the helium-ion bombardment of aluminum are contrasted, and the difference between the yields leads to an excitation function for the (He/sup 4/,He/sup 3/He/sup 4/) reaction. (auth)
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