Core excitations in the structure and reactions of halo nuclei

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We analyse the resonant break-up of halo nuclei including possible excita- tions of the core both in the structure of the halo nucleus and in the reaction dynamics. The structure of the halo nucleus is treated in the weak-coupling limit, assuming a parti- cle+core model with core excitations. The bound and resonant states of this system are calculated as an expansion in a pseudo-state basis, for which we use a recent generaliza- tion of the Transformed Harmonic Oscillator basis. This basis is used within a distorted wave Born approximation reaction framework which includes possible excitations and deexcitations of the core during the collision. We apply this scheme to describe the res- onant break-up of 11 Be on 12 C at 67 MeV/u. Comparing with the available experimental data from RIKEN (N. Fukuda et al., PRC 70, 054606 (2004)) we discuss the possibil- ity of extracting spectroscopic information of 11 Be resonances from the analysis of the break-up angular distributions.