Abstract
A new study of the quasi-free contribution to the \(^3\hbox {He}+\,^9\hbox {Be}\rightarrow 3\alpha \) reaction (Q value = 19.004 MeV) at low \({E}_{^3{{\mathrm{He}}}}\) energy is presented. The reaction was studied in a kinematically complete experiment at beam energy of 4 MeV. To clarify the presence of the quasi-free mechanism, the \(^4{\hbox {He}}\)–\(^5\hbox {He}\) momentum distribution of the \(^9\hbox {Be}\) ground state was extracted. Standard tests were also carried out to confirm the presence of the quasi-free contribution and are reported in this work. The full width at half maximum of the \(^4\hbox {He}\)–\(^5\hbox {He}\) inter-cluster momentum distribution inside \(^9\hbox {Be}\) was measured with improved accuracy, by adopting several different approaches that all led to consistent results. These preliminary investigations on the reaction mechanism are fundamental for future studies employing the Trojan Horse Method, with the \(^5\hbox {He}\) unbound nucleus as a virtual projectile.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data are available upon request to the corresponding author.]
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Acknowledgements
The authors are truly indebted to Prof. A.M. Mukhamedzhanov for discussions and help on theoretical points. This work has been partially supported by the Italian Ministry of University (MIUR) under grant LNS-Astrofisica Nucleare (fondi premiali), by the Croatian Science Foundation under Project No. 7194 and in part by the Scientific Centre of Excellence for Advance Materials and Sensor in Zagreb.
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Spitaleri, C., Lattuada, M., Cvetinović, A. et al. Study of the quasi-free \(^3\hbox {He}+\,^9\hbox {Be}\rightarrow 3\alpha \) reaction for the Trojan Horse Method. Eur. Phys. J. A 56, 18 (2020). https://doi.org/10.1140/epja/s10050-020-00026-x
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DOI: https://doi.org/10.1140/epja/s10050-020-00026-x