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

TL;DR

This paper presents a relativistic eikonal analysis of $^{11}$Be breakup at 520 MeV/nucleon, resolving discrepancies in $dB({\rm E1})/dE$ estimations between GSI and RIKEN experiments.

Contribution

It introduces a relativistic eikonal model with Coulomb correction for analyzing $^{11}$Be breakup, unifying previous experimental results.

Findings

Excellent agreement with GSI and RIKEN data achieved.

Resolves previous discrepancies in $dB({\rm E1})/dE$ estimations.

Provides a reliable method for extracting electromagnetic response functions.

Abstract

We analyze the breakup of the one-neutron halo nucleus $^{11}$Be measured at 520 MeV/nucleon at GSI on Pb and C targets within an eikonal description of the reaction including a proper treatment of special relativity. The Coulomb term of the projectile-target interaction is corrected at first order, while its nuclear part is described at the optical limit approximation. Excellent agreement with the data is obtained using a description of $^{11}$Be, which fits the breakup data of RIKEN. This solves the apparent discrepancy between the $dB({\rm E1})/dE$ estimations from GSI and RIKEN for this nucleus.