Levels in ${}^8\mathrm{B}$ have been investigated experimentally using the invariant-mass technique and compared with ab initio calculations. Datasets obtained using $E/A$ = 69-MeV ${}^9\mathrm{C}$ and ${}^{13}\mathrm{O}$ beams on a Be target have been further analyzed to extend the level scheme of ${}^8\mathrm{B}$ for $E^{*}\lesssim 10$ MeV. New levels were observed in the $2p+{}^6\mathrm{Li}, p+{}^3\mathrm{He}+\alpha$, and the $p+{}^7\mathrm{Be}+\gamma$ exit channels. Momentum correlations between the decay fragments were also investigated in order to deduce the decay pathways and whether the decays are prompt or sequential. This nucleus and its mirror were also investigated in the ab initio symmetry-adapted no-core shell model. Correspondence between the newly observed and predicted levels was made based on the level energy and the decay modes. For positive-parity levels with $J\le 3$, all predicted levels can be connected to an experimental counterpart (at least tentatively) for $E^{*}\le 8.4$ MeV.

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• Energy levels
• Nuclear structure & decays
• Proton emission
• Rare & new isotopes
• Unstable nuclei induced nuclear reactions
• 6 ≤ A ≤ 19
• Ab initio calculations
• Models based on symmetries
• Radioactive beams