Tangential Friction in Deep-Inelastic Scattering ofO16from Nickel

Bombarding Ni targets with 96-MeV ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ions, we have observed deep-inelastic groups of mass-16 and -12 reaction products with $Q$ values centered at -30 to - 35 MeV. From the multiplicity of the coincident $\gamma$ de-excitation, total fragment spins and hence, using a classical model, orbital angular momentum transfers of $12\hslash$ to $15\hslash$ are deduced. These, and at least 50% of the energy dissipation, are ascribed to tangential friction.