[en] We report differential cross section measurements for the stretched transition from the ¹⁰B ground state (J^π=3⁺) to the ¹⁰Be ground state (J^π=0⁺) in the ¹⁰B(n,p)¹⁰Be (g.s.) reaction. These data were obtained over the energy range from 70 to 240 MeV, covering momentum transfer values from 0.6 to 2.5 fm^-1. In this momentum transfer range, the isovector tensor effective interaction dominates the transition. Cross sections are compared to zero- and finite-range distorted wave impulse approximation calculations using modern free and density-dependent effective interactions and a transition density consistent with (e,e^') data. Good agreement is observed at energies above 120 MeV, but below this energy the cross sections are larger than the calculated values by more than 40%. The implications for DWIA calculations are discussed