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We extend our previous calculation of the breakup of 11Be using HaloEffective Field Theory and the Dynamical Eikonal Approximation to include aneffective 10Be-n-target force. The force is constructed to account for thevirtual excitation of 10Be to its low-lying 2+ excited state. In the case ofbreakup on a 12C target this improves the description of the neutron-energy andangular spectra, especially in the vicinity of the 11Be 5/2+ state. Byfine-tuning the range parameters of the three-body force, a reasonabledescription of data in the region of the 3/2+ 11Be state can also be obtained.This sensitivity to the three-body force's range results from the structure ofthe overlap integral that governs the 11Be s-to-d-state transitions induced bythe three-body force.

Simulating core excitation in breakup reactions of halo nuclei using an effective three-body force