Open Access

Kathrin Göbel, Michael Heil, Lukas Bott, Leonard Brandenburg, Christoph Caesar, Isabell Deuter, Alexander Grein, Aleksandra Keliç-Heil, Daniel Körper, Bastian Löher, René Reifarth, Deniz Savran, Hendrik Schulte, Haik Simon, Hans Toshihide Törnqvist, Tahani Almusidi, Héctor Álvarez-Pol, Liam Atkins, Thomas Aumann, Daniel Bemmerer, Jose Fernando Benlliure Anaya, Konstanze Boretzky, Benjamin Brückner, Pablo Cabanelas Eiras, Enrique Casarejos Ruiz, Joakim Cederkäll, Leonid V. Chulkov, Dolores Cortina Gil, Andrey Danilov, Philipp Erbacher, Sonia Escribano Rodriguez, Zsolt Fülöp, Ashton Falduto, Stefan Fiebiger, Igor Gašparić, Maria José Garcia Borge, Roman Gernhäuser, Jan Glorius, David Gonzales Caamaño, Anna-Lena Hartig, Tanja Heftrich, Henning Heggen, Marcel Heine, Andreas Heinz, Thomas Hensel, Matthias Holl, Håkan T. Johansson, Björn Jonson, Nasser Kalantar-Nayestanaki, Armel Kamenyero, Kafa al- Khasawneh, Oleg A. Kiselev, Philipp Klenze, Marvin Kohls, Thorsten Kröll, Dmytro Kresan, Cem Deniz Kurtulgil, Nikolaus Kurz, Christoph Langer, Christopher Lehr, Yuri A. Litvinov, Enis Lorenz, Silvia Murillo Morales, Enrique Nácher González, Thomas Nilsson, Joochun Park, Stefanos Paschalis, Angel Perea Martinez, Marina Petri, Ralf Plag, Lukas Ponnath, Romana Popočovski, Markus Reich, Han-Bum Rhee, Jose Luis Rodriguez Sanchez, Dominic M. Rossi, Heiko Scheit, Konrad Schmidt, Zuzana Slavkovská, Viktor Starostin, Sonja Storck, Christian Sürder, Junki Tanaka, Olof Tengblad, Benedikt Thomas, Stefan Typel, László Varga, Klaus Volk, Meiko Volknandt, Vadim Wagner, Felix Wamers, Mario Weigand, Lorenzo Zanetti

• We measured the Coulomb dissociation of 16O into 4He and 12C at the R3B setup in a first campaign within FAIR Phase 0 at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. The goal was to improve the accuracy of the experimental data for the 12C(α,γ)16O fusion reaction and to reach lower center-ofmass energies than measured so far. The experiment required beam intensities of 109 16O ions per second at an energy of 500 MeV/nucleon. The rare case of Coulomb breakup into 12C and 4He posed another challenge: The magnetic rigidities of the particles are so close because of the same mass-to-charge-number ratio A/Z = 2 for 16O, 12C and 4He. Hence, radical changes of the R3B setup were necessary. All detectors had slits to allow the passage of the unreacted 16O ions, while 4He and 12C would hit the detectors' active areas depending on the scattering angle and their relative energies. We developed and built detectors based on organic scintillators to track and identify the reaction products with sufficient precision.