One-neutron knockout from Sc51-55
Artikel i vetenskaplig tidskrift, 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
Författare
S. Schwertel
Technische Universität München
P. Maierbeck
Technische Universität München
R. Krucken
TRIUMF
Technische Universität München
University of British Columbia (UBC)
R. Gernhauser
Technische Universität München
T. Kroll
Technische Universität München
Technische Universität Darmstadt
H. Alvarez-Pol
Universidade de Santiagode Compostela
F. Aksouh
Helmholtz
T. Aumann
Helmholtz
K. Behr
Helmholtz
E. Benjamim
Universidade de Santiagode Compostela
J. Benlliure
Universidade de Santiagode Compostela
V. Bildstein
Technische Universität München
M. Böhmer
Technische Universität München
K. Boretzky
Helmholtz
M. J. G. Borge
Consejo Superior de Investigaciones Científicas (CSIC)
A. Brunle
Helmholtz
A. Burger
Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)
Universitetet i Oslo
M. Caamano
Universidade de Santiagode Compostela
E. Casarejos
Universidad de Vigo
A. Chatillon
Helmholtz
L. V. Chulkov
Helmholtz
D. Cortina-Gil
Universidade de Santiagode Compostela
J. Enders
Technische Universität Darmstadt
K. Eppinger
Technische Universität München
T. Faestermann
Technische Universität München
J. Friese
Technische Universität München
L. Fabbietti
Technische Universität München
M. Gascon
Universidade de Santiagode Compostela
H. Geissel
Helmholtz
J. Gerl
Helmholtz
M. Gorska
Helmholtz
P. G. Hansen
Michigan State University
Björn Jonson
Chalmers, Teknisk fysik, Subatomär fysik
R. Kanungo
TRIUMF
Saint Mary's University
Helmholtz
O. Kiselev
Johannes Gutenberg-Universität Mainz
Helmholtz
Paul Scherrer Institut
I. Kojouharov
Helmholtz
A. Klimkiewicz
Helmholtz
T. Kurtukian
Universidade de Santiagode Compostela
N. Kurz
Helmholtz
Kristian Larsson
Chalmers, Teknisk fysik, Subatomär fysik
T. Le Bleis
Université de Strasbourg
Helmholtz
K. Mahata
Helmholtz
Paul Scherrer Institut
L. Maier
Technische Universität München
Thomas Nilsson
Chalmers, Teknisk fysik, Subatomär fysik
C. Nociforo
Helmholtz
Göran Hugo Nyman
Chalmers, Teknisk fysik, Subatomär fysik
C. Pascual-Izarra
Consejo Superior de Investigaciones Científicas (CSIC)
A. Perea
Consejo Superior de Investigaciones Científicas (CSIC)
D. Perez
Universidade de Santiagode Compostela
A. Prochazka
Helmholtz
Univerzita Komenskeho v Bratislave
C. Rodriguez-Tajes
Universidade de Santiagode Compostela
D. Rossi
Johannes Gutenberg-Universität Mainz
H. Schaffner
Helmholtz
G. Schrieder
Technische Universität Darmstadt
H. Simon
Helmholtz
B. Sitar
Univerzita Komenskeho v Bratislave
M. Stanoiu
Helmholtz
K. Suemmerer
Helmholtz
Olof Tengblad
Consejo Superior de Investigaciones Científicas (CSIC)
H. Weick
Helmholtz
S. Winkler
Technische Universität München
B. A. Brown
Universidad de 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 191Ämneskategorier (SSIF 2011)
Subatomär fysik
Fysik
Fundament
Grundläggande vetenskaper
DOI
10.1140/epja/i2012-12191-5