Dipole excitation and geometry of borromean nuclei

Abstract

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.

4 pages, 4 eps figures

References in corpus (4)

• Coexistence of BCS and BEC-like pair structures in halo nuclei
• Electromagnetic strength of neutron and proton single-particle halo nuclei
• Charge radius and dipole response of ${}^{11}$Li
• Three-body model calculations for 16C nucleus

Cited by in corpus (8)

• Universal properties and structure of halo nuclei
• Constraining the nuclear pairing gap with pairing vibrations
• Role of diproton correlation in two-proton emission decay of the ${}^6$Be nucleus
• Two-particle correlations in continuum dipole transitions in Borromean nuclei
• Probing the pairing interaction through two-neutron transfer reactions
• Charge and Matter Form Factors of Two-Neutron Halo Nuclei in Halo Effective Field Theory at Next-to-leading-order
• Universal geometry of two-neutron halos and Borromean Efimov states close to dissociation
• On the existence of Rydberg nuclear molecules