Abstract
For the first time in an application to nuclear astrophysics, a process induced by the unstable \(^5\)He = (\(^4\)He-n) nucleus, the \(^3\)He+\(^5\)He\(\rightarrow \)2\(\alpha \) reaction, has been studied through the Trojan Horse Method (THM). For that purpose, the quasi-free (QF) contribution of the \(^9\)Be(\(^3\)He,\(\alpha \alpha \))\(^4\)He reaction was selected at \(E_{^{3}\text{ He }}=4\) MeV incident energy. The reaction was studied in a kinematically complete experiment following a recent publication (Spitaleri et al. in Eur Phys J A 56:18, 2020), where for the quasi free contribution the momentum distribution between \(\alpha \) and \(^5\)He particle cluster in the \(^9\)Be nucleus in the ground state have been extracted. The angular distribution of the QF \(^3\)He+\(^5\)He\(\rightarrow \)2\(\alpha \) reaction was measured at \(\theta _{cm}\) = 78\(^{\circ }\)–115\(^{\circ }\). The energy dependence of the differential cross section of the \(^3\)He+\(^5\)He\( \rightarrow \)2\(\alpha \) virtual reaction was extracted in the energy range \(E_{cm}\) = 0–650 keV. The total cross section obtained from the Trojan-horse method was normalized to absolute cross sections from a theoretical calculation in the energy range \(E_{cm}\) =300–620 keV.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data generated during this study are contained in this published article (or reference therein).]
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Acknowledgements
C.A.B. was partially supported by the U.S. DOE Grant No. DE-FG02-08ER41533 and funding contributed by the LANL Collaborative Research Program by the Texas A&M System National Laboratory Office and Los Alamos National Laboratory. A.M.M. acknowledges support from the U.S. DOE Grant No. DE-FG02-93ER40773 and NNSA Grant No. DENA 0003841. S.T. is grateful for the support from the LNS during a stay in January 2020 that initiated the theoretical calculation, T.K. was partially supported by Grants-in-Aid for Scientific Research of JSPS (20K03958, 17K05459). This work has been partially supported by the Italian Ministry of University (MIUR) under grant LNS - Astrofisica Nucleare (fondi premiali) and by PON RI 2014-2020 - AIM (Attraction and International Mobility), project AIM1848704-3, by the Croatian Science Foundation under project no.7194 and project n\(_o\).P-2018-01-1257 and in part by the Scientific Centre of excellence for advance materials and sensor in Zagreb AIM (Attraction and International Mobility), project AIM1848704-3
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Spitaleri, C., Typel, S., Bertulani, C.A. et al. The \(^3\)He+\(^5\)He\(\rightarrow \) \(\alpha \)+\(\alpha \) reaction below the Coulomb barrier via the Trojan Horse Method. Eur. Phys. J. A 57, 20 (2021). https://doi.org/10.1140/epja/s10050-020-00324-4
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DOI: https://doi.org/10.1140/epja/s10050-020-00324-4