We have investigated the ${}^{18}\mathrm{C}$ longitudinal momentum distributions from fragmentation of ${}^{19}\mathrm{C}$, calculated in a binary coupling model. We have found that inclusion of a low-lying resonance in the ${}^{19}\mathrm{C}$, with $E_{\mathrm{res}}\sim 0.2\hspace{0.5em}\mathrm{MeV}$, and sequential decay of this state together with the one-neutron stripping process, can simultaneously describe the different fragmentation data measured at intermediate and high projectile energies.

• Received 23 November 1998

DOI:https://doi.org/10.1103/PhysRevC.59.2048