Study of multinucleon knockout reactions of exotic nuclei in the region of Sn

¹ IGFAE, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
² Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, 64289 Darmstadt, Germany
³ RBI Zagreb, Bijenicka cesta 54, HR10000, Zagreb, Croatia
⁴ GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291, Darmstadt, Germany
⁵ Helmholtz Research Academy Hesse for FAIR, 64289 Darmstadt, Germany
⁶ Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
⁷ Goethe-Universität Frankfurt, Max-von-Laue Str. 1, 60438, Frankfurt am Main, Germany
⁸ CINTECX, Universidade de Vigo, E-36200 Vigo, Spain
⁹ Department of Physics, Lund University, P.O. box 118, 221 00 Lund, Sweden
¹⁰ CEA, DAM, DIF, F-91297 Arpajon, France
¹¹ INFN Sezione di Catania, Via Santa Sofia 64, 95123, Catania, Italy
¹² Laboratório de Instrumentaçâo e Física Experimental de Partículas, LIP, Av. Prof. Gama Pinto 2, 1649-003 Lisbon, Portugal
¹³ Università di Catania, Dipartimento di Fisica e Astronomia "Ettore Majorana", Catania, Italy
¹⁴ Technische Universität München, James-Franck-Str 1, 85748, Garching, Germany
¹⁵ Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
¹⁶ Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, Bautzner Landstraße 400, 01328, Dresden, Germany
¹⁷ ESRIG, University of Groningen, Groningen, Netherlands
¹⁸ INFN Laboratori Nazionali del Sud, Via Santa Sofia 62, 95133, Catania, Italy
¹⁹ School of Physics, Engineering and Technology, University of York, YO10 5DD York, UK

^* email: martina.feijoo.fontan@usc.es

Published online: 8 December 2023

Abstract

The experimental data collected during the S515 experiment performed by the R³B collaboration at GSI/FAIR represent a great opportunity to investigate nucleon knockout reactions of exotic nuclei in the region of Sn using complete kinematics measurements. These cross sections can be used in the future to investigate the quenching in the knockout of the minority species (neutrons or protons) in nuclei far from stability. Some of the arguments put forward are the underestimation of the knockout of deeply bound nucleons, final state interactions or the role of short-range correlations (SRC). Recently, several works based on inclusive measurements have shown that these SRCs could reduce the single nucleon knockout cross sections by around 50%, depending on the neutron excess (N/Z) of the initial projectile. The S515 data can help us to go further in this investigation because it allows to correlate the knockout cross sections of one, two or more nucleons with the number of protons and neutrons emitted from the target and which can be detected by the CALIFA and NeuLAND detectors, respectively, and perform complete kinematical studies on the nature of the event (SRC, evaporation, emission of clusters, final-state interactions...). Here the results obtained for the charge distribution of reaction residues are presented, which is one of the first steps of the still on-going analysis.