Structure and three-body decay of Be9 resonances
Abstract
The complex-rotated hyperspherical adiabatic method is used to study the decay of low-lying Be9 resonances into one neutron and two α particles. We investigate the six resonances above the breakup threshold and below 6 MeV: 1/2±, 3/2±, and 5/2±. The short-distance properties of each resonance are studied, and the different angular momentum and parity configurations of the Be8 and He5 two-body substructures are determined. We compute the branching ratio for sequential decay via the Be8 ground state, which qualitatively is consistent with measurements. We extract the momentum distributions after decay directly into the three-body continuum from the large-distance asymptotic structures. The kinematically complete results are presented as Dalitz plots as well as projections on given neutron and α energy. The distributions are discussed and, in most cases, found to agree with available experimental data.
- Publication:
-
Physical Review C
- Pub Date:
- September 2010
- DOI:
- 10.1103/PhysRevC.82.034001
- arXiv:
- arXiv:1008.4237
- Bibcode:
- 2010PhRvC..82c4001A
- Keywords:
-
- 21.45.-v;
- 21.60.Jz;
- 25.70.Ef;
- 27.20.+n;
- Few-body systems;
- Hartree-Fock and random-phase approximations;
- Resonances;
- 6<
- =A<
- =19;
- Nuclear Theory
- E-Print:
- 12 pages, 10 figures. To appear in Physical Review C