An accurate understanding of charged particle induced reactions is important for astrophysics and nuclear applications. Evaluations of light nuclei reaction cross sections are often performed using resonance matrix analysis and play a fundamental role in nuclear data libraries such as ENDF. Prompted by recent experimental measurements, an improved $R$-matrix analysis for the ${}^8\mathrm{Be}$ system is presented. It is compared to existing evaluations and discrepancies are discussed and often resolved. These comparisons are facilitated by a Bayesian uncertainty analysis that produces uncertainties for the $R$-matrix parameters and experimental cross sections. The $R$-matrix parameters reported in this work pave the way for an update to the current ENDF evaluation. The impact of this work on key reactions, such as ${}^6\mathrm{Li}(d,n){}^7\mathrm{Be}$, ${}^7\mathrm{Li}(p,n){}^7\mathrm{Be}$, ${}^7\mathrm{Li}(p,\gamma ){}^8\mathrm{Be}$, and ${}^7\mathrm{Be}(n,p){}^7\mathrm{Li}$, which are used in nuclear applications and astrophysics, is discussed.

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• Elastic scattering reactions
• Inelastic scattering reactions
• Nuclear astrophysics
• Nuclear reactions
• Nuclear structure & decays
• 6 ≤ A ≤ 19