The absolute strength of the [Formula Presented] resonance for [Formula Presented] has been determined. The experiment was carried out by measuring the number of resonant [Formula Presented] particles, integrated over the yield curve, simultaneously with the number of Rutherford scattered protons. The method applied in the present work is independent of target stoichiometry, uniformity, stopping power, beam straggling, and current integration. For the resonance strength, we obtained a value of [Formula Presented] Previous results are systematically higher, because the change of target stoichiometry under proton bombardment was not taken into account. With proper consideration, the present method can also be applied to other low-energy [Formula Presented] resonances
