Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range
Journal article, 2019
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.
Inverse kinematics
Quasi-free scattering
neutrons
Shell model
nuclei
Spectroscopic factors
Author
M. Holl
Helmholtz
TRIUMF
Saint Mary's University
Technische Universität Darmstadt
V. Panin
RIKEN
Technische Universität Darmstadt
H. Alvarez-Pol
Universidade de Santiagode Compostela
L. Atar
Technische Universität Darmstadt
T. Aumann
Technische Universität Darmstadt
Helmholtz
S. Beceiro-Novo
Universidade de Santiagode Compostela
J. Benlliure
Universidade de Santiagode Compostela
C.A. Bertulani
Texas A&M University
J. M. Boillos
Universidade de Santiagode Compostela
K. Boretzky
Helmholtz
M. Caamano
Universidade de Santiagode Compostela
C. Caesar
Technische Universität Darmstadt
Helmholtz
E. Casarejos
University of Vigo
W. N. Catford
University of Surrey
J. Cederkall
Lund University
L. V. Chulkov
National Research Centre "Kurchatov Institute"
D. Cortina-Gil
Universidade de Santiagode Compostela
E. Cravo
University of Lisbon
I. Dillmann
Justus Liebig University Giessen
Helmholtz
Paloma Diaz Fernandez
Chalmers, Physics, Subatomic and Plasma Physics
Universidade de Santiagode Compostela
Z. Elekes
Hungarian Academy of Sciences
J. Enders
Technische Universität Darmstadt
L. M. Fraile
Complutense University
D. Galaviz Redondo
University of Lisbon
LIP - Lisboa
R. Gernhäuser
Technical University of Munich
P.I. Golubev
Lund University
T. Heftrich
Goethe University Frankfurt
M. Heil
Helmholtz
M. Heine
University of Strasbourg
Andreas Martin Heinz
Chalmers, Physics, Subatomic and Plasma Physics
A. Henriques
LIP - Lisboa
Håkan T Johansson
Chalmers, Physics, Subatomic and Plasma Physics
Björn Jonson
Chalmers, Physics, Subatomic and Plasma Physics
N. Kalantar-Nayestanaki
Kernfysisch Versneller Institut
R. Kanungo
Saint Mary's University
TRIUMF
A. Kelic-Heil
Helmholtz
T. Kröll
Technische Universität Darmstadt
N. Kurz
Helmholtz
C. Langer
Goethe University Frankfurt
T. Le Bleis
Technical University of Munich
Simon Lindberg
Chalmers, Physics, Subatomic and Plasma Physics
J. Machado
Nova University of Lisbon
E. Nacher
CSIC - Instituto de Estructura de la Materia (IEM)
M. A. Najafi
Kernfysisch Versneller Institut
Thomas Nilsson
Chalmers, Physics
C. Nociforo
Helmholtz
S. Paschalis
University of York
Technische Universität Darmstadt
M. Petri
University of York
Technische Universität Darmstadt
R. Reifarth
Goethe University Frankfurt
G. Ribeiro
CSIC - Instituto de Estructura de la Materia (IEM)
C. Rigollet
Kernfysisch Versneller Institut
D. Rossi
Technische Universität Darmstadt
Helmholtz
D. Savran
Helmholtz
H. Scheit
Technische Universität Darmstadt
H. Simon
Helmholtz
Olivier Sorlin
Grand Accélérateur National d'Ions Lourds (GANIL)
I. Syndikus
Technische Universität Darmstadt
O. Tengblad
CSIC - Instituto de Estructura de la Materia (IEM)
Y. Togano
RIKEN
M. Vandebrouck
Grand Accélérateur National d'Ions Lourds (GANIL)
P. Velho
LIP - Lisboa
F. Wamers
Technische Universität Darmstadt
Helmholtz
H. Weick
Helmholtz
C. Wheldon
University of Birmingham
G. L. Wilson
University of Surrey
J. S. Winfield
Helmholtz
P. J. Woods
University of Edinburgh
Mikhail Zhukov
Chalmers, Physics
K. Zuber
Technische Universität Dresden
Hungarian Academy of Sciences
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
0370-2693 (ISSN)
Vol. 795 682-688Experimental studies of exotic, light nuclear systems - combining front-line physics and FAIR preparations
Swedish Research Council (VR) (2011-5324), 2012-01-01 -- 2014-12-31.
Subject Categories
Accelerator Physics and Instrumentation
Subatomic Physics
Theoretical Chemistry
DOI
10.1016/j.physletb.2019.06.069