Interaction cross sections (σ I) for Ne isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/nucleon using BigRIPS at RIBF, RIKEN. The σ I for 27-32Ne in every case exceed the systematic mass-number dependence of σ I for stable nuclei, which can be explained by considering the nuclear deformation. In particular the σ I for 29Ne and 31Ne are significantly greater than those of their neighboring nuclides. These enhancements of σ I for 29Ne and 31Ne cannot be explained by a single-particle model calculation under the assumption that the valence neutron of 29Ne ( 31Ne) occupies the 0d 3/2 (0f 7/2) orbital, as expected from the standard spherical shell ordering. The present data suggest an s dominant halo structure of 29Ne and s- or p-orbital halo in 31Ne.
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2012 Feb 1|
- Island of inversion
- Neutron halo
ASJC Scopus subject areas
- Nuclear and High Energy Physics