An analysis of the angular distributions of $\alpha$ particles from the ${\mathrm{Be}}^9({\mathrm{Li}}^6, \alpha ){\mathrm{B}}^{11}$ 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 ${\mathrm{Li}}^6$ and the ${\mathrm{Be}}^9$ nuclei may be represented by the two-cluster configurations "alpha particle plus deuteron" and "alpha particle plus ${\mathrm{He}}^5$" 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.

• Received 15 May 1961

DOI:https://doi.org/10.1103/PhysRev.123.2145