Abstract
We have measured the parallel momentum distributions of outcoming fragments in the one-neutron breakup of the odd-mass carbon isotopes and . Owing to their low neutron separation energies, the study of these nuclei is of particular interest regarding the appearance of the halo phenomenon. Discrepancies between experiment and theory observed for and indicate that their halos are not as prominent as in Be or Li, and that core excitations start playing a role in the breakup mechanism. In the halo appears hindered by a -wave neutron ground state configuration. Finally, the data on suggests an -wave neutron around the 2 excited state in .
- Received 9 December 1997
DOI:https://doi.org/10.1103/PhysRevC.57.2156
©1998 American Physical Society