@article{10272/28006,
year = {2025},
url = {https://hdl.handle.net/10272/28006},
abstract = {The 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.},
organization = {Results presented here are based on the experiment S444/S473, which was performed at the beamline infrastructure Cave-C at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany) in the context of FAIR Phase-0. The project was supported by BMBF 05P21WOFN1, 05P19WOFN1, 05P21RDFN2, 05P19RDFN1, HFHF (“Helmholtz Forschungsakademie Hessen für FAIR”) and funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy – EXC 2094 – 390783311 and the GSI-TU Darmstadt cooperation agreement. C.A.B. acknowledges support by the U.S. DOE grant DE-FG02-08ER41533. This work has been partly supported by the Spanish Funding Agency for Research (AEI) through Projects No. PGC2018-099746-B-C21, PGC2018-099746-B-C22, ID2019-104390GB-I00, PID2021-125771NB-C21, PID2021-125771NB-C22 and PID2022-140162NB-I00. J. Park acknowledges the support by the Institute for Basic Science (IBS-R031-D1). I.G., A.H, D.J.M. and I.L. have been supported by Croatian Science Foundation (HRZZ) under project no. 1257. Supported by Portuguese FCT Project EXPL/FIS-NUC/0364/2021. J.L.R.S. thanks the support from Xunta de Galicia under the program of postdoctoral fellowships ED481B-2017-002 and ED481D-2021-018, and by the Grant No. RYC2021-031989-I. T.A., Y.A.L, and A.O. thank the State of Hesse within the Research Cluster ELEMENTS through project ID 500/10.006. Support by the Swedish Research Council under Contract No. 2022-04248, 2014-06644-VR and 2021-04576-VR. This research was supported in part by the ExtreMe Matter Institute EMMI at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. This work was supported by the Royal Society and the UK STFC under grant numbers ST/L005727/1, ST/P003885/1 and ST/V001035/1. M.F.F thanks the support from Xunta de Galicia with the Grant No. ED481A-2023-049 under the program of predoctoral fellowships.},
publisher = {Elsevier},
title = {Precise measurement of nuclear interaction cross sections towards neutron-skin determination with R3B},
doi = {10.1016/j.nuclphysa.2025.123022},
author = {Ponnath, Lukas and Dueñas Díaz, José Antonio and Wamers, Felix},
}