Breakup of ¹¹Be and ¹⁵C on light targets including core excitations

Longitudinal momentum distributions and total diffraction and stripping cross sections for production of ¹⁰Be and ¹⁴C fragments in ground and excited states, by removal of a valence neutron or a core neutron, are studied in the eikonal approximation for the ⁹Be(¹¹Be, ¹⁰Be+γ) and ⁹Be(¹⁵C, ¹⁴C+γ) reactions. A consistent description of recent exclusive data for individual ¹⁰Be states is obtained, giving support to the procedure. Predictions for ¹⁴C are in agreement with available inclusive and limited inclusive data, and argue for halo model for ¹⁵C. The sensitivity of the results to the structural assumptions and interaction potentials is discussed.