Backward angle cross sections for Al27+O16 reaction products

Reactions induced by bombarding a O16 gas target with Al27 ions were studied. Evaporation residues as well as target-like recoils were measured over a wide range of Q values. The yield of particles with 6 ≤ Z ≤ 9 was found to be forward peaked in the laboratory frame. These target-like particles emerge with center-of-mass kinetic energies that, on the average, are independent of the reaction angle. Their combined cross section has a 1sinθc.m. angular dependence. If this cross section is assumed to be symmetric about 90°(c.m.) the integrated cross section is about 10% of the measured evaporation residue cross section at a center-of-mass energy of 54 MeV. NUCLEAR REACTIONS Al27+O16, EAl27=105, 145 MeV; measured dσdΩ for reaction products with 6<~Z<~9 and Z>13 for 2.5°<~θL<~15°. Extracted σ for evaporation residues and damped events.