We use the three-body model and the sudden approximation to compute angular correlations in high-energy fragmentation reactions of two-neutron halos on light targets. The contribution from one-neutron absorption by far dominates over that of neutron scattering. We use ${}^6\mathrm{He}$ $(n+n+\alpha )$ and ${}^{11}\mathrm{Li}$ ${(n+n+}^9\mathrm{Li})$ as examples and study the dependence of the predictions of this model on different physical assumptions and parameters.

• Received 4 June 1998

DOI:https://doi.org/10.1103/PhysRevC.58.R2654