Abstract
The best examples of halo nuclei, exotic systems with a diffuse nuclear cloud surrounding a tightly
bound core, are found in the light, neutron-rich region, where the halo neutrons experience only weak
binding and a weak, or no, potential barrier. Modern direct-reaction measurement techniques provide
powerful probes of the structure of exotic nuclei. Despite more than four decades of these studies on the
benchmark one-neutron halo nucleus 11Be, the spectroscopic factors for the two bound states remain
poorly constrained. In the present work, the 10Beðd;pÞ reaction has been used in inverse kinematics at four
beam energies to study the structure of 11Be. The spectroscopic factors extracted using the adiabatic
model were found to be consistent across the four measurements and were largely insensitive to the optical
potential used. The extracted spectroscopic factor for a neutron in an n‘j ¼ 2s1=2 state coupled to the
ground state of 10Be is 0.71(5). For the first excited state at 0.32 MeV, a spectroscopic factor of 0.62(4) is
found for the halo neutron in a 1p1=2 state.
