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Pavel Golubev

Pavel Golubev

Senior lecturer

Pavel Golubev

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

Author

  • M. Holl
  • Joakim Cederkäll
  • Pavel Golubev
  • K. Zuber

Summary, in English

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. © 2019 The Authors

Department/s

  • Nuclear physics

Publishing year

2019-08-10

Language

English

Pages

682-688

Publication/Series

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

795

Document type

Journal article

Publisher

Elsevier

Topic

  • Other Physics Topics

Keywords

  • Inverse kinematics
  • Quasi-free scattering
  • Shell model
  • Spectroscopic factors

Status

Published

ISBN/ISSN/Other

  • ISSN: 0370-2693