The measured correlation of charged-particle energies and angles with $\gamma$-ray multiplicities indicate that the average angular momentum transferred in the capture of ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$, and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ from 153-MeV ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ projectiles by a ${}_{}{}^{154}{}_{}{}^{}\mathrm{Sm}$ target increases linearly with captured mass. These incomplete-fusion processes are shown to originate from undamped peripheral collisions.

• Received 11 June 1979

DOI:https://doi.org/10.1103/PhysRevLett.43.1303