Dipole resonances in light neutron-rich nuclei studied with time-dependent calculations of antisymmetrized molecular dynamics
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
To study isovector dipole responses of neutron-rich nuclei, we applied a time-dependent method of antisymmetrized molecular dynamics. The dipole resonances in Be, B, and C isotopes were investigated. In {sup 10}Be, {sup 15}B, and {sup 16}C, collective modes of the vibration between a core and valence neutrons cause soft resonances at the excitation energy E{sub x}=10-15 MeV below the giant dipole resonance (GDR). In {sup 16}C, we found that a remarkable peak at E{sub x}=14 MeV corresponds to the coherent motion of four valence neutrons against a {sup 12}C core, whereas the GDR arises in the E{sub x}>20 MeV region because of vibration within the core. In {sup 17}B and {sup 18}C, the dipole strengths in the low-energy region decline compared with those in {sup 15}B and {sup 16}C. We also discuss the energy-weighted sum rule for the E1 transitions.
- OSTI ID:
- 20771078
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 72, Issue 6; Other Information: DOI: 10.1103/PhysRevC.72.064301; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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