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 ${}^{10}$Be, ${}^{15}$B, ${}^{16}$C, collective modes of the vibration between a core and valence neutrons cause soft resonances at the excitation energy $E_x=10-15$ MeV below the giant dipole resonance(GDR). In ${}^{16}$C, we found that a remarkable peak at $E_x=14$ MeV corresponds to coherent motion of four valence neutrons against a ${}^{12}$C core, while the GDR arises from the core vibration in the $E_x>20$ MeV region. In ${}^{17}$B and ${}^{18}$C, the dipole strengths in the low energy region decline compared with those in ${}^{15}$B and ${}^{16}$C. We also discuss the energy weighted sum rule for the $E1$ transitions.

arXiv comment12 figures, submitted to Phys. Rev. C

References in corpus (8)

• Structure of Light Unstable Nuclei Studied with Antisymmetrized Molecular Dynamics
• Variation after Angular Momentum Projection for the Study of Excited States Based on Antisymmetrized Molecular Dynamics
• Linear response theory in the continuum for deformed nuclei: Green's function vs. time-dependent Hartree-Fock with the absorbing-boundary condition
• QRPA plus Phonon Coupling Model and the Photoabsorbtion Cross Section for ${}^{18,20,22}$O
• Anomalously hindered E2 strength B(E2;2_1^+ -> 0^+) in 16C
• Effect of large neutron excess on the dipole response in the region of the Giant Dipole Resonance
• Deformation of C isotopes
• ${}^{16}$C inelastic scattering studied with microscopic coupled-channels method

Cited by in corpus (6)

• Giant Dipole Resonance as a Fingerprint of $\alpha$ Clustering Configurations in ${}^{12}$C and ${}^{16}$O
• Dipole oscillation modes in light $\alpha$-clustering nuclei
• Isoscalar monopole and dipole excitations of cluster states and giant resonances in ${}^{12}$C
• Isovector and isoscalar dipole excitations in ${}^9$Be and ${}^{10}$Be studied with antisymmetrized molecular dynamics
• Monopole oscillations in light nuclei with a molecular dynamics approach
• Structure and decay of the pygmy dipole resonance in 26Ne