The (9Be, 8B) reaction and the unbound nuclide 10Li

Selective population of unbound states in 10Li

“…The unbound nature of 10 Li was determined in 1966 by Poskanzer, Cosper, and Hyde [7]. Almost ten years later, Wilcox and collaborators made the first measurement of the unbound nucleus, using a ( 9 Be, 8 B) reaction to measure a mass excess of 33.83 ± 0.25 MeV [8]. This placed the first measured unbound state at 0.8 ± 0.25 MeV decay energy [8].…”

“…Almost ten years later, Wilcox and collaborators made the first measurement of the unbound nucleus, using a ( 9 Be, 8 B) reaction to measure a mass excess of 33.83 ± 0.25 MeV [8]. This placed the first measured unbound state at 0.8 ± 0.25 MeV decay energy [8]. The next measurement was made 15 years later [9] and since then, there have been many measurements of energies of the continuum structure of 10 Li [4,5,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]34].…”

The Binding Mechanism and a Low-Lying Resonance in 11Li

“…In these models, the 9 Li-n interaction is chosen so as to reproduce the experimental p-wave resonance energy of 10 Li at E r ∼ 0.5 MeV. However, despite the success of this model in explaining the halo structure of 11 Li, the binding energy of 11 Li is not reproduced. For example, in the cluster orbital shell model (COSM), 3) which is one of the pioneering 9 Li+n+n models, the binding energy is too weak at least 1-2 MeV.…”

“…1) The first motivation for studying neutron-rich nuclei was provided by the observation of the large interaction cross-section of 11 Li. 2) It has been discussed in many works that the large interaction cross-section can be explained in terms of the so-called halo structure, which is a cloud of valence neutrons around the core nucleus.…”

“…Early in the study of the exotic structure of 11 Li, calculations based on the 9 Li+n+n three-body model were carried out. In these models, the 9 Li-n interaction is chosen so as to reproduce the experimental p-wave resonance energy of 10 Li at E r ∼ 0.5 MeV.…”