Dipole resonances in light neutron-rich nuclei studied with time-dependent calculations of antisymmetrized molecular dynamics
Abstract
In order to study isovector dipole response of neutron-rich nuclei, we have applied a time-dependent method of antisymmetrized molecular dynamics. The dipole resonances in Be, B and C isotopes have been investigated. In 10Be, 15B, 16C, collective modes of the vibration between a core and valence neutrons cause soft resonances at the excitation energy Ex=10-15 MeV below the giant dipole resonance(GDR). In 16C, we found that a remarkable peak at Ex=14 MeV corresponds to coherent motion of four valence neutrons against a 12C core, while the GDR arises from the core vibration in the Ex >20 MeV region. In 17B and 18C, the dipole strengths in the low energy region decline compared with those in 15B and 16C. We also discuss the energy weighted sum rule for the E1 transitions.
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