  Radiative capture reactions play a pivotal role for our understanding of the
origin of the elements in the cosmos. Recoil separators provide an effective
way to study these reactions, in inverse kinematics, and take advantage of the
use of radioactive ion beams. However, a limiting factor in the study of
radiative capture reactions in inverse kinematics is the momentum spread of the
product nuclei, which can result in an angular spread larger than the geometric
acceptance of the separator. The DRAGON facility at TRIUMF is a versatile
recoil separator, designed to study radiative capture reactions relevant to
astrophysics in the $\mathrm{A \sim 10-30}$ region. In this work we present the
first attempt to study with DRAGON a reaction,
$\mathrm{^6Li(\alpha,\gamma)^{10}B}$ , for which the recoil angular spread
exceeds DRAGON's acceptance. Our result is in good agreement with the
literature value, showing that DRAGON can measure resonance strengths of
astrophysically important reactions even when not all the recoils enter the
separator.
