Angular-Momentum Dissipation in Heavy-Ion Collisions

Abstract

The angular-momentum dissipation in deeply inelastic heavy-ion collisions is described as a transport process. Using transport coefficients which have been evaluated within a single-particle model, mean value and variance of the intrinsic angular momenta of the fragments are calculated. The fluctuations become important already for initial relative angular momenta $l\lesssim \frac{1}{2}{l}_{\mathrm{grazing}}$. Excellent agreement with $\gamma$-multiplicity data for the reaction ${}_{}{}^{86}{}_{}{}^{}\mathrm{Kr}$(5.99 MeV/nucleon) + ${}_{}{}^{166}{}_{}{}^{}\mathrm{Er}$ is obtained.