New experimental data for the ${}^6\mathrm{He}{+}^{27}\mathrm{Al}$ collision at $E_{\mathrm{lab}}=17.9$ MeV bombarding energy is presented. An abundant production of $\alpha$ particles has been observed with energies close to those of the scattered ${}^6\mathrm{He}$ beam. The ${}^6\mathrm{He}{+}^{27}\mathrm{Al}$ elastic scattering and the $\alpha$-particle angular and energy distributions were obtained. Theoretical analyzes were performed using continuum-discretized coupled-channels calculations in both three- and four-body frameworks, nonelastic breakup calculations via the Ichimura-Austern-Vincent (IAV) model, and fusion-evaporation simulations. The results demonstrate that $\alpha$-particle production is predominantly driven by nonelastic breakup processes with negligible contributions from elastic breakup and $\alpha$- particle evaporation.

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• Low-energy multiple-particle dynamics
• Nuclear reactions
• Low- & intermediate-energy accelerators
• Particle accelerator facilities
• Nuclear data analysis & compilation
• Nuclear many-body theory
• Particle accelerators
• Radioactive beams