Pole Feynman diagrams with heavy particle transfer mechanism are known to explain the anomalous backscattering of $\alpha$ particles by light nuclei. Triangle Feynman diagrams (with the heavy particle transfer mechanism) are used here to explain forward elastic scattering for the same reactions.

NUCLEAR REACTIONS: Forward cross section.

• Received 12 November 1976

DOI:https://doi.org/10.1103/PhysRevC.16.1785