Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.19: Poster

Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG

Fully Dynamical Analysis of Coulomb Breakup Experiments for the Determination of the α(d, γ)6Li cross section — •Monica Sanjinez Ortiz and Pierre Capel — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany

In the modelling of Big Bang nucleosynthesis, the cross sections of reactions leading to the formation of light nuclei play a fundamental role. For the synthesis of 6Li, in particular, the radiative capture process α(d, γ)6Li is of utmost importance. From experiments, the direct determination of the cross section is difficult at low energy, and there exists only one set of direct measurements in the energy range of interest. Coulomb breakup has been considered as an alternative method to infer the low-energy cross section of reactions for astrophysics as it corresponds to the time reversed process of radiative captures. In the past, two experiments of 6Li breakup onto 208Pb have been performed: at 26A MeV and at 150A MeV. With a fully dynamical reaction model based on the eikonal approximation, we report here on a new theoretical analysis of this breakup reaction. Our results indicate that the breakup cross section at 150A MeV is nuclear dominated with marked interferences with the Coulomb component. Accordingly, it is difficult to infer radiative capture cross sections from data at this energy. Similarly, the analysis of the reaction at 26A MeV points towards a nuclear dominated contribution at forward angles. Nevertheless, at low beam energy and large scattering angles, the reaction seems Coulomb dominated, suggesting a way to overcome the aforementioned difficulty.

Keywords: nuclear reactions; Big-Bang nucleosynthesis; indirect methods; cluster nuclei