Low energy dipole modes in 14 C, 12 Be and 11 Li. Coulomb dissociation of 11 Li

1997
16 pages
Published in:
  • Nucl.Phys.A 615 (1997) 245-260
  • Published: 1997

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Abstract: (Elsevier)
We have performed a calculation of the low energy dipole modes in 14 C, 12 Be and 11 Li using a two-neutron pairing model. The lowest 1 − states of 14 C are well described by the model and two 1 − states are predicted with 2.7 and 4.3 MeV excitation energies in 12 Be. In 11 Li we obtain a large enhancement of the dipole strength at E ̃ d = 1.2 MeV close to the energy of the “soft dipole resonance” seen in experiments with a B (E1) = 1.2–1.3 e 2 fm 2 if, and only if, we assume a low energy (0.1–0.2 MeV) s-resonance in 10 Li. Simultaneously we have studied the two-neutron Coulomb dissociation of 11 Li by several targets and have obtained under the same assumption good agreement with the values determined from experiments for a lead target.
  • 21.45+v
  • 23.20 Lv
  • 24.30 Gd
  • 25.70 De