Ponnath, LukasDueñas Díaz, José AntonioWamers, Felix2026-02-252026-02-252025Ponnath, L., Aumann, T., Bertulani, C. A., Gernhäuser, R., Almusidi, T., Alvarez-Pol, H., Atar, L., Atkins, L., Ayyad, Y., Benlliure, J., Boretzky, K., Borge, M. J. G., Bott, L. T., Bruni, G., Brückner, B., Cabanelas, P., Caesar, C., Casarejos, E., Cederkall, J., … Wamers, F. (2025). Precise measurement of nuclear interaction cross sections towards neutron-skin determination with R3B. Nuclear Physics A, 1056, 123022. https://doi.org/10.1016/j.nuclphysa.2025.1230220375-94741873-1554 (electrónico)https://hdl.handle.net/10272/28006The R3B (Reactions with Relativistic Radioactive Beams) experiment as a major instrument of the NUSTAR collaboration for the research facility FAIR in Darmstadt is designed for kinematically complete studies of reactions with high-energy radioactive beams. Part of the broad physics program of R3B is to constrain the asymmetry term in the nuclear equation-of-state and hence improve the description of highly asymmetric nuclear matter (e.g., in neutron stars). For a precise determination of the neutron-skin thickness -- an observable which is directly correlated with the symmetry energy in theoretical calculations -- by measuring absolute fragmentation cross sections, it is essential to quantify the uncertainty and challenge the reaction model under stable conditions. During the successful FAIR Phase-0 campaign of R3B, we precisely measured the energy dependence of total interaction cross sections in 12C +12C collisions, for a direct comparison with calculations based on the eikonal reaction theory.engAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/journal article10.1016/j.nuclphysa.2025.123022open access2207 Física Atómica y Nuclear