Abstract
The proton drip-line nucleus is studied in a three-body model of plus two protons. The nucleus has a Borromean binding structure, and calculations show a rms matter radius of 2.77–2.81 fm, in agreement with experiment. The model gives a proton radius excess about 0.26–0.32 fm over the neutron radius, showing that a proton skin is present. The 73% probability of a valence proton being outside the rms core radius is sufficiently large, however, to indicate a halo. Predictions for the momentum distributions of fragments are given, and these, if verified, would also suggest a two-proton halo structure for . This would be the first identification of a two-proton halo nucleus.
- Received 20 April 1995
DOI:https://doi.org/10.1103/PhysRevC.52.3505
©1995 American Physical Society