par Descouvemont, Pierre 
Référence Physical Review C (Nuclear Physics), 52, 2, page (704-710)
Publication Publié, 1995
Référence Physical Review C (Nuclear Physics), 52, 2, page (704-710)
Publication Publié, 1995
Article révisé par les pairs
| Résumé : | The Be14 nucleus is investigated in the three-cluster generator coordinate method, involving several Be12+n+n configurations. The Be12 core nucleus is described in the harmonic oscillator model with all possible configurations in the p shell. We present the theoretical energy spectrum of Be14 up to 5 MeV excitation energy, and show that the matter densities support a halo structure of the ground state. A strong enhancement of the rms radius with respect to the Be12 core is obtained, in agreement with experiment. Our calculation indicates that the Be12 (g.s.)+n+n configuration represents 66% only of the total wave function, and that core excitations cannot be neglected. A comparative study of the Be12, Be13, and Be14 nuclei is performed with identical conditions of calculation. We also analyze dipole and quadrupole excitations of the Be14 ground state, and show that a significant part of the sum rules for soft modes is exhausted at low excitation energies. © 1995 The American Physical Society. |
