Dipole excitation and geometry of borromean nuclei

Details Dipole excitation and geometry of borromean nuclei Dipole excitation and geometry of borromean nuclei

2007-08-11

arxiv.org/abs/0708.1543v1

Phys.Rev.C76:047302,2007

Physics

Nuclear Physics

Nuclear Theory

4 pages, 4 eps figures

Scientific paper

10.1103/PhysRevC.76.047302

We analyze the Coulomb breakup cross sections of $^{11}$Li and $^6$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 break-up 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 $^{11}$Li and $^6$He agree with the three-body model predictions.

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