• DOI:10.1103/PhysRevC.76.047302
• Corpus ID: 119315589

Dipole excitation and geometry of Borromean nuclei

@article{Hagino2007DipoleEA,
  title={Dipole excitation and geometry of Borromean nuclei},
  author={Kouichi Hagino and Hiroyuki Sagawa},
  journal={Physical Review C},
  year={2007},
  volume={76},
  pages={047302}
}

• K. Hagino, H. Sagawa
• Published 11 August 2007
• Physics
• Physical Review C

We analyze the Coulomb breakup cross sections of {sup 11}Li and {sup 6}He nuclei using a three-body model with a density-dependent contact interaction. We show that the concentration of the B(E1) strength near the threshold can be well reproduced with this model. With the help of the calculated B(E1) value, we extract the root-mean-square (rms) distance between the core nucleus and the center-of-mass of two valence neutrons without resorting to the sum rule, which may suffer from unphysical Pauli forbidden transitions. Together with the empirical rms distance between the neutrons obtained from the matter radius study and also from the three-body correlation study in the breakup reaction, we convert these rms distances to the mean opening angle between the valence neutrons from the core nucleus. We find that the obtained mean opening angles in {sup 11}Li and {sup 6}He agree with the three-body model predictions.