Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range

Holl, M.  (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) (Saint Mary's University, B3H 3C3 Halifax, Nova Scotia, Canada) (TRIUMF, Vancouver, British Columbia, V6T 2A3, Canada) ; Panin, V. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (RIKEN, Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan) ; Alvarez-Pol, H. (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Atar, L. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) ; Aumann, T. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Beceiro-Novo, S. (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Benlliure, J. (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Bertulani, C.A. (Texas A&M; University-Commerce, Commerce, TX, 75428, United States of America) ; Boillos, J.M. (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Boretzky, K. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Caamaño, M. (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Caesar, C. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Casarejos, E. (Universidad de Vigo, Vigo, 36310, Spain) ; Catford, W. (University of Surrey, Surrey, GU2 7XH, United Kingdom) ; Cederkall, J. (Department of Physics, Lund University, Lund, 22100, Sweden) ; Chulkov, L. (NRC Kurchatov Institute, pl. Akademika Kurchatova, Moscow, 123182, Russia) ; Cortina-Gil, D. (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Cravo, E. (CFTC, Faculdade de Ciencias, University of Lisbon, Lisbon, 1749-016, Portugal) ; Dillmann, I. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) (Justus-Liebig-Universität Gießen, Gießen, 35392, Germany) ; Díaz Fernández, P. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) (IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain) ; Elekes, Z. (ATOMKI Debrecen, Bem tér 18/c, Debrecen, 4026, Hungary) ; Enders, J. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) ; Fraile, L.M. (Grupo de Física Nuclear & IPARCOS, Universidad Complutense de Madrid, Madrid, 28040, Spain) ; Galaviz Redondo, D. (Laboratory for Instrumentation and Experimental Particle Physics, LIP, Lisbon, 1649-003, Portugal) (Physics Department of the Faculty of Sciences, University of Lisbon, Lisbon, 1749-016, Portugal) ; Gernhäuser, R. (Technische Universität München, Garching, 85748, Germany) ; Golubev, P. (Department of Physics, Lund University, Lund, 22100, Sweden) ; Heftrich, T. (Goethe-Universität Frankfurt, Frankfurt am Main, 60438, Germany) ; Heil, M. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Heine, M. (IPHC-CNRS/Université de Strasbourg, Strasbourg, 67037, France) ; Heinz, A. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) ; Henriques, A. (Laboratory for Instrumentation and Experimental Particle Physics, LIP, Lisbon, 1649-003, Portugal) ; Johansson, H.T. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) ; Jonson, B. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) ; Kalantar-Nayestanaki, N. (KVI-CART, University of Groningen, Groningen, 9747 AA, Netherlands) ; Kanungo, R. (Saint Mary's University, B3H 3C3 Halifax, Nova Scotia, Canada) (TRIUMF, Vancouver, British Columbia, V6T 2A3, Canada) ; Kelic-Heil, A. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Kröll, T. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) ; Kurz, N. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Langer, C. (Goethe-Universität Frankfurt, Frankfurt am Main, 60438, Germany) ; Le Bleis, T. (Technische Universität München, Garching, 85748, Germany) ; Lindberg, S. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) ; Machado, J. (LIBPhys-UNL, FCT, Universidade Nova de Lisboa, Caparica, 2829-516, Portugal) ; Nacher, E. (Instituto de Estructura de la Materia, CSIC, Madrid, E-28006, Spain) ; Najafi, M.A. (KVI-CART, University of Groningen, Groningen, 9747 AA, Netherlands) ; Nilsson, T. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) ; Nociforo, C. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Paschalis, S. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (Department of Physics, University of York, York, YO10 5DD, United Kingdom) ; Petri, M. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (Department of Physics, University of York, York, YO10 5DD, United Kingdom) ; Reifarth, R. (Goethe-Universität Frankfurt, Frankfurt am Main, 60438, Germany) ; Ribeiro, G. (Instituto de Estructura de la Materia, CSIC, Madrid, E-28006, Spain) ; Rigollet, C. (KVI-CART, University of Groningen, Groningen, 9747 AA, Netherlands) ; Rossi, D.M. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Savran, D. (ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Scheit, H. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) ; Simon, H. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Sorlin, O. (GANIL, Boulevard Henri Becquerel, Caen, 14076, France) ; Syndikus, I. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) ; Tengblad, O. (Instituto de Estructura de la Materia, CSIC, Madrid, E-28006, Spain) ; Togano, Y. (RIKEN, Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan) ; Vandebrouck, M. (GANIL, Boulevard Henri Becquerel, Caen, 14076, France) ; Velho, P. (Laboratory for Instrumentation and Experimental Particle Physics, LIP, Lisbon, 1649-003, Portugal) ; Wamers, F. (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Weick, H. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Wheldon, C. (University of Birmingham, Birmingham, B15 2TT, United Kingdom) ; Wilson, G.L. (University of Surrey, Surrey, GU2 7XH, United Kingdom) ; Winfield, J.S. (GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, 64291, Germany) ; Woods, P. (University of Edinburgh, Edinburgh, EH8 9YL, United Kingdom) ; Zhukov, M. (Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, S-412 96, Sweden) ; Zuber, K. (Technische Universität Dresden, Institut für Kern- und Teilchenphysik, Dresden, 01069, Germany) (ATOMKI Debrecen, Bem tér 18/c, Debrecen, 4026, Hungary)

09 July 2019

Abstract: The quasi-free scattering reactions 11 C (p,2p) and 10,11,12 C (p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the R 3 B-LAND setup. The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the 12 C( p,2p ) and 12 C( p,pn ) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of single-particle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p,2p) are found to be 'significantly smaller than for (p,pn) reactions for all investigated nuclei.


Published in: Physics letters B 795 (2019) 682-688 DOI: 10.1016/j.physletb.2019.06.069
License: CC-BY-3.0



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