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.

Quasi-free scattering

Shell model

Inverse kinematics

Spectroscopic factors

nuclei

neutrons

Author

M. Holl

Saint Mary's University

Technische Universität Darmstadt

Helmholtz

TRIUMF

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

Universidad de 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

Helmholtz

Justus Liebig University Giessen

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

LIP - Lisboa

University of Lisbon

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

Technische Universität Darmstadt

University of York

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

Helmholtz

Technische Universität Darmstadt

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

Helmholtz

Technische Universität Darmstadt

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. 795 682-688

Experimental studies of exotic, light nuclear systems - combining front-line physics and FAIR preparations

Swedish Research Council (VR), 2012-01-01 -- 2014-12-31.

Subject Categories

Accelerator Physics and Instrumentation

Subatomic Physics

Theoretical Chemistry

DOI

10.1016/j.physletb.2019.06.069

More information

Latest update

11/9/2020