Dipole excitation and geometry of Borromean nuclei

  title={Dipole excitation and geometry of Borromean nuclei},
  author={Kouichi Hagino and Hiroyuki Sagawa},
  journal={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… 

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