The differential cross sections of the Be 9 (Li 6 ,a)B u reaction have been measured as a function of energy and angle. The a particles leaving the B 11 in the ground state, ceo, in the first excited state, a\, and in the second and third excited states, 012+0:3, were observed at 10° intervals from 10° to 160° (lab system) at Li 6 energies of 3.00, 3.25, and 3.50 Mev, and at 20°, 60°, 90°, 120°, and 160° (cm. system) at Li 6 energies of 2.00, 2.50, 3.75, and 4.00 Mev. The angular distributions of the ao and on groups are asymmetric about 90° cm. Relative maxima occur at both large and small angles for each of the ce-particle groups, with the yields at large angles being comparable to those at small angles. In all cases the angular distribution varies slowly with bombarding energy and the yields at each angle increase monotonically with increasing energy. At 3.50 Mev the total cross sections are 0.97^=0.38 mb for «o and 0.65=b0.26 mb for a\. The experimental results suggest that the reactions proceed mainly by direct-interaction mechanisms.
Measurements of the elastic scattering differential cross sections have been made for the ^-A 40 interaction. For proton energies between 1.75 Mev and 2.75 Mev and at an angle of 155°, the cross sections are essentially given by the Rutherford equation except for resonances at 1.90 Mev and 2.48 Mev. At these resonance energies, angular distributions for the interaction have been measured.
An analysis of the angular distributions of a particles from the Be 9 (Li 6 ,o:)B 11 reactions has been carried out using a simple "lump" stripping model. Both the normal stripping mode and that exchange mode commonly called "heavy-particle stripping" have been incorporated in the analysis. The model assumes that the Li 6 and the Be 9 nuclei may be represented by the two-cluster configurations "alpha particle plus deuteron" and "alpha particle plus He 5 " respectively. The angular distribution calculated for the first excited state reaction provides a satisfactory fit to previously published experimental results at a laboratory bombarding energy of 3.25 Mev. The theoretical angular distribution for the ground state reaction is less successful but does show the principle features of the experimentally observed angular distribution.* This work was supported in part by the joint program of the U. S. Atomic Energy Commission and the Office of Naval Recoo YC §i 1
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