Physics Letters B (Aug 2019)
Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range
- M. Holl,
- V. Panin,
- H. Alvarez-Pol,
- L. Atar,
- T. Aumann,
- S. Beceiro-Novo,
- J. Benlliure,
- C.A. Bertulani,
- J.M. Boillos,
- K. Boretzky,
- M. Caamaño,
- C. Caesar,
- E. Casarejos,
- W. Catford,
- J. Cederkall,
- L. Chulkov,
- D. Cortina-Gil,
- E. Cravo,
- I. Dillmann,
- P. Díaz Fernández,
- Z. Elekes,
- J. Enders,
- L.M. Fraile,
- D. Galaviz Redondo,
- R. Gernhäuser,
- P. Golubev,
- T. Heftrich,
- M. Heil,
- M. Heine,
- A. Heinz,
- A. Henriques,
- H.T. Johansson,
- B. Jonson,
- N. Kalantar-Nayestanaki,
- R. Kanungo,
- A. Kelic-Heil,
- T. Kröll,
- N. Kurz,
- C. Langer,
- T. Le Bleis,
- S. Lindberg,
- J. Machado,
- E. Nacher,
- M.A. Najafi,
- T. Nilsson,
- C. Nociforo,
- S. Paschalis,
- M. Petri,
- R. Reifarth,
- G. Ribeiro,
- C. Rigollet,
- D.M. Rossi,
- D. Savran,
- H. Scheit,
- H. Simon,
- O. Sorlin,
- I. Syndikus,
- O. Tengblad,
- Y. Togano,
- M. Vandebrouck,
- P. Velho,
- F. Wamers,
- H. Weick,
- C. Wheldon,
- G.L. Wilson,
- J.S. Winfield,
- P. Woods,
- M. Zhukov,
- K. Zuber
Affiliations
- M. Holl
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; Saint Mary's University, B3H 3C3 Halifax, Nova Scotia, Canada; TRIUMF, V6T 2A3 Vancouver, British Columbia, Canada; Corresponding author.
- V. Panin
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; RIKEN, Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, 351-0198 Wako, Saitama, Japan
- H. Alvarez-Pol
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- L. Atar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- T. Aumann
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- S. Beceiro-Novo
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- J. Benlliure
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- C.A. Bertulani
- Texas A&M University-Commerce, 75428 Commerce, TX, United States of America
- J.M. Boillos
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- K. Boretzky
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- M. Caamaño
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- C. Caesar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- E. Casarejos
- Universidad de Vigo, 36310 Vigo, Spain
- W. Catford
- University of Surrey, Surrey GU2 7XH, United Kingdom
- J. Cederkall
- Department of Physics, Lund University, 22100 Lund, Sweden
- L. Chulkov
- NRC Kurchatov Institute, pl. Akademika Kurchatova, Moscow 123182, Russia
- D. Cortina-Gil
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- E. Cravo
- CFTC, Faculdade de Ciencias, University of Lisbon, 1749-016 Lisbon, Portugal
- I. Dillmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
- P. Díaz Fernández
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden; IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- Z. Elekes
- ATOMKI Debrecen, Bem tér 18/c, 4026 Debrecen, Hungary
- J. Enders
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- L.M. Fraile
- Grupo de Física Nuclear & IPARCOS, Universidad Complutense de Madrid, 28040 Madrid, Spain
- D. Galaviz Redondo
- Laboratory for Instrumentation and Experimental Particle Physics, LIP, 1649-003 Lisbon, Portugal; Physics Department of the Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal
- R. Gernhäuser
- Technische Universität München, 85748 Garching, Germany
- P. Golubev
- Department of Physics, Lund University, 22100 Lund, Sweden
- T. Heftrich
- Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
- M. Heil
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- M. Heine
- IPHC-CNRS/Université de Strasbourg, 67037 Strasbourg, France
- A. Heinz
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
- A. Henriques
- Laboratory for Instrumentation and Experimental Particle Physics, LIP, 1649-003 Lisbon, Portugal
- H.T. Johansson
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
- B. Jonson
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
- N. Kalantar-Nayestanaki
- KVI-CART, University of Groningen, 9747 AA Groningen, Netherlands
- R. Kanungo
- Saint Mary's University, B3H 3C3 Halifax, Nova Scotia, Canada; TRIUMF, V6T 2A3 Vancouver, British Columbia, Canada
- A. Kelic-Heil
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- T. Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- N. Kurz
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- C. Langer
- Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
- T. Le Bleis
- Technische Universität München, 85748 Garching, Germany
- S. Lindberg
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
- J. Machado
- LIBPhys-UNL, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- E. Nacher
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- M.A. Najafi
- KVI-CART, University of Groningen, 9747 AA Groningen, Netherlands
- T. Nilsson
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
- C. Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- S. Paschalis
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; Department of Physics, University of York, York YO10 5DD, United Kingdom
- M. Petri
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; Department of Physics, University of York, York YO10 5DD, United Kingdom
- R. Reifarth
- Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
- G. Ribeiro
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- C. Rigollet
- KVI-CART, University of Groningen, 9747 AA Groningen, Netherlands
- D.M. Rossi
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- D. Savran
- ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- H. Scheit
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- H. Simon
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- O. Sorlin
- GANIL, Boulevard Henri Becquerel, 14076 Caen, France
- I. Syndikus
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- O. Tengblad
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- Y. Togano
- RIKEN, Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, 351-0198 Wako, Saitama, Japan
- M. Vandebrouck
- GANIL, Boulevard Henri Becquerel, 14076 Caen, France
- P. Velho
- Laboratory for Instrumentation and Experimental Particle Physics, LIP, 1649-003 Lisbon, Portugal
- F. Wamers
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- H. Weick
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- C. Wheldon
- University of Birmingham, Birmingham B15 2TT, United Kingdom
- G.L. Wilson
- University of Surrey, Surrey GU2 7XH, United Kingdom
- J.S. Winfield
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- P. Woods
- University of Edinburgh, Edinburgh EH8 9YL, United Kingdom
- M. Zhukov
- Institutionen för Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
- K. Zuber
- Technische Universität Dresden, Institut für Kern- und Teilchenphysik, 01069 Dresden, Germany; ATOMKI Debrecen, Bem tér 18/c, 4026 Debrecen, Hungary
- Journal volume & issue
-
Vol. 795
pp. 682 – 688
Abstract
The quasi-free scattering reactions 11C(p,2p) and 10,11,12C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the R3B-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 12C(p,2p) and 12C(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. Keywords: Quasi-free scattering, Inverse kinematics, Shell model, Spectroscopic factors
