One-neutron knockout from Sc51-55
Journal article, 2012
Results are presented from a one-neutron knockout experiment at relativistic energies of approximate to 420 A MeV on Sc51-55 using the GSI Fragment Separator as a two-stage magnetic spectrometer and the Miniball array for gamma-ray detection. Inclusive longitudinal momentum distributions and cross-sections were measured enabling the determination of the contributions corresponding to knockout from the nu p(1/2), nu p(3/2), (L = 1) and nu f(7/2), nu f(5/2) (L = 3) neutron orbitals. The observed L = 1 and L = 3 contributions are compared with theoretical cross-sections using eikonal knockout theory and spectroscopic factors from shell model calculations using the GXPF1A interaction. The measured inclusive knockout cross-sections generally follow the trends expected theoretically and given by the spectroscopic strength predicted from the shell model calculations. However, the deduced L = 1 cross-sections are generally 30-40% higher while the L = 3 contributions are about a factor of two smaller than predicted. This points to a promotion of neutrons from the nu f(7/2) to the nu p(3/2) orbital indicating a weakening of the N = 28 shell gap in these nuclei. While this is not predicted for the phenomenological GXPF1A interaction such a weakening is predicted by recent calculations using realistic low-momentum interactions V-lowk obtained by evolving a chiral N3LO nucleon-nucleon potential.
n=32
heavy-ions
exotic nuclei
shell-model
ti-55
Author
S. Schwertel
Technical University of Munich
P. Maierbeck
Technical University of Munich
R. Krucken
TRIUMF
Technical University of Munich
University of British Columbia (UBC)
R. Gernhauser
Technical University of Munich
T. Kroll
Technical University of Munich
Technische Universität Darmstadt
H. Alvarez-Pol
Universidade de Santiagode Compostela
F. Aksouh
Helmholtz Association of German Research Centres
T. Aumann
Helmholtz Association of German Research Centres
K. Behr
Helmholtz Association of German Research Centres
E. Benjamim
Universidade de Santiagode Compostela
J. Benlliure
Universidade de Santiagode Compostela
V. Bildstein
Technical University of Munich
M. Böhmer
Technical University of Munich
K. Boretzky
Helmholtz Association of German Research Centres
M. J. G. Borge
Spanish National Research Council (CSIC)
A. Brunle
Helmholtz Association of German Research Centres
A. Burger
The French Alternative Energies and Atomic Energy Commission (CEA)
University of Oslo
M. Caamano
Universidade de Santiagode Compostela
E. Casarejos
University of Vigo
A. Chatillon
Helmholtz Association of German Research Centres
L. V. Chulkov
Helmholtz Association of German Research Centres
D. Cortina-Gil
Universidade de Santiagode Compostela
J. Enders
Technische Universität Darmstadt
K. Eppinger
Technical University of Munich
T. Faestermann
Technical University of Munich
J. Friese
Technical University of Munich
L. Fabbietti
Technical University of Munich
M. Gascon
Universidade de Santiagode Compostela
H. Geissel
Helmholtz Association of German Research Centres
J. Gerl
Helmholtz Association of German Research Centres
M. Gorska
Helmholtz Association of German Research Centres
P. G. Hansen
Michigan State University
Björn Jonson
Chalmers, Applied Physics, Subatomic Physics
R. Kanungo
TRIUMF
Saint Mary's University
Helmholtz Association of German Research Centres
O. Kiselev
Johannes Gutenberg University Mainz
Helmholtz Association of German Research Centres
Paul Scherrer Institut
I. Kojouharov
Helmholtz Association of German Research Centres
A. Klimkiewicz
Helmholtz Association of German Research Centres
T. Kurtukian
Universidade de Santiagode Compostela
N. Kurz
Helmholtz Association of German Research Centres
Kristian Larsson
Chalmers, Applied Physics, Subatomic Physics
T. Le Bleis
University of Strasbourg
Helmholtz Association of German Research Centres
K. Mahata
Helmholtz Association of German Research Centres
Paul Scherrer Institut
L. Maier
Technical University of Munich
Thomas Nilsson
Chalmers, Applied Physics, Subatomic Physics
C. Nociforo
Helmholtz Association of German Research Centres
Göran Hugo Nyman
Chalmers, Applied Physics, Subatomic Physics
C. Pascual-Izarra
Spanish National Research Council (CSIC)
A. Perea
Spanish National Research Council (CSIC)
D. Perez
Universidade de Santiagode Compostela
A. Prochazka
Helmholtz Association of German Research Centres
Comenius University in Bratislava
C. Rodriguez-Tajes
Universidade de Santiagode Compostela
D. Rossi
Johannes Gutenberg University Mainz
H. Schaffner
Helmholtz Association of German Research Centres
G. Schrieder
Technische Universität Darmstadt
H. Simon
Helmholtz Association of German Research Centres
B. Sitar
Comenius University in Bratislava
M. Stanoiu
Helmholtz Association of German Research Centres
K. Suemmerer
Helmholtz Association of German Research Centres
Olof Tengblad
Spanish National Research Council (CSIC)
H. Weick
Helmholtz Association of German Research Centres
S. Winkler
Technical University of Munich
B. A. Brown
University of Vigo
T. Otsuka
University of Tokyo
J. A. Tostevin
University of Surrey
W. D. M. Rae
European Physical Journal A
1434-6001 (ISSN) 1434-601X (eISSN)
Vol. 48 Dec. 191-10 191Subject Categories (SSIF 2011)
Subatomic Physics
Physical Sciences
Roots
Basic sciences
DOI
10.1140/epja/i2012-12191-5