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

Holl, M.; Cederkäll, Joakim LU ; Golubev, Pavel LU ; Zuber, K. and , (2019) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 795. p.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... (More)
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 (Less)
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Contribution to journal
publication status
published
subject
keywords
Inverse kinematics, Quasi-free scattering, Shell model, Spectroscopic factors
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
795
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85068550166
ISSN
0370-2693
DOI
10.1016/j.physletb.2019.06.069
language
English
LU publication?
yes
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a32ec895-2dd7-4f40-b832-fffaff3314fd
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068550166&doi=10.1016%2fj.physletb.2019.06.069&partnerID=40&md5=86804f9005ce5b7dfc0d8ac11d861932
date added to LUP
2019-07-22 11:12:04
date last changed
2019-08-14 04:42:05
@article{a32ec895-2dd7-4f40-b832-fffaff3314fd,
  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. © 2019 The Authors},
  author       = {Holl, M. and Cederkäll, Joakim and Golubev, Pavel and Zuber, K. and , },
  issn         = {0370-2693},
  keyword      = {Inverse kinematics,Quasi-free scattering,Shell model,Spectroscopic factors},
  language     = {eng},
  month        = {08},
  pages        = {682--688},
  publisher    = {Elsevier},
  series       = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range},
  url          = {http://dx.doi.org/10.1016/j.physletb.2019.06.069},
  volume       = {795},
  year         = {2019},
}