The dependence with energy and target mass of friction coefficients $K$ deduced from ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$-induced reaction data are analyzed within the one-body energy dissipation formalism. The observed systematics for $K$ are explained as arising from changes in the effective reaction geometry. A unified expression for the angular distributions of the projectilelike products from these reactions is deduced.

NUCLEAR REACTIONS $X({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, Y)$, $X={}_{}{}^{12}{}_{}{}^{}\mathrm{C}, {}_{}{}^{27}{}_{}{}^{}\mathrm{Al}, {}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}, {}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$, $Y=\mathrm{projectilelike}$ fragments ($Z=3-9\mathrm{}$), $E=100-315\mathrm{}$ MeV. Dependence of frictional coefficients on target mass and $E$ studied. Mass-flow rate deduced. Unified expression for slopes of $\sigma (E, Z, \theta )$ found.

• Received 21 April 1982

DOI:https://doi.org/10.1103/PhysRevC.26.1764