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We analyze the breakup of the one-neutron halo nucleus $^{11}$Be measured at520 MeV/nucleon at GSI on Pb and C targets within an eikonal description of thereaction including a proper treatment of special relativity. The Coulomb termof the projectile-target interaction is corrected at first order, while itsnuclear part is described at the optical limit approximation. Excellentagreement with the data is obtained using a description of $^{11}$Be, whichfits the breakup data of RIKEN. This solves the apparent discrepancy betweenthe $dB({\rm E1})/dE$ estimations from GSI and RIKEN for this nucleus.

Reliable extraction of the $dB({\rm E1})/dE$ for $^{11}$Be from its breakup at 520 MeV/nucleon