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At the John D. Fox Superconducting Linear Accelerator Laboratory a near-
threshold proton resonance in 11B at Eex = 11.44 ± 0.04 MeV is observed via
the reaction 10Be(d,n)11B →10Be + p in inverse kinematics, measured with a
beam of the radioactive isotope 10Be. The resonance energy at Ec.m. = 211(40)
keV is consistent with a proton signal observed by Ayyad et al. in the β−delayed
proton decay of 11Be. By comparison to a DWBA calculation, a 0.27(6) spec-
troscopic factor is extracted and a tentative (` = 0) character is assigned for this
resonance. The significant cross section in the proton-transfer (d,n) reaction as
well as the observation of its proton-decay signal point to a threshold-resonance
character of this state, as recently suggested by Oko lowiczet al. .
