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.

ti-55

n=32

shell-model

exotic nuclei

heavy-ions

Author

S. Schwertel

Technical University of Munich

P. Maierbeck

Technical University of Munich

R. Krucken

Technical University of Munich

University of British Columbia (UBC)

TRIUMF

R. Gernhauser

Technical University of Munich

T. Kroll

Technische Universität Darmstadt

Technical University of Munich

H. Alvarez-Pol

Universidade de Santiagode Compostela

F. Aksouh

GSI Helmholtz Centre for Heavy Ion Research

T. Aumann

GSI Helmholtz Centre for Heavy Ion Research

K. Behr

GSI Helmholtz Centre for Heavy Ion Research

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

GSI Helmholtz Centre for Heavy Ion Research

M. J. G. Borge

CSIC - Instituto de Estructura de la Materia (IEM)

A. Brunle

GSI Helmholtz Centre for Heavy Ion Research

A. Burger

The French Alternative Energies and Atomic Energy Commission (CEA)

University of Oslo

M. Caamano

Universidade de Santiagode Compostela

E. Casarejos

Universidad de Vigo

A. Chatillon

GSI Helmholtz Centre for Heavy Ion Research

L. V. Chulkov

GSI Helmholtz Centre for Heavy Ion Research

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

GSI Helmholtz Centre for Heavy Ion Research

J. Gerl

GSI Helmholtz Centre for Heavy Ion Research

M. Gorska

GSI Helmholtz Centre for Heavy Ion Research

P. G. Hansen

Michigan State University

Björn Jonson

Chalmers, Applied Physics, Subatomic Physics

R. Kanungo

TRIUMF

Saint Mary's University

GSI Helmholtz Centre for Heavy Ion Research

O. Kiselev

GSI Helmholtz Centre for Heavy Ion Research

Johannes Gutenberg University Mainz

Paul Scherrer Institut

I. Kojouharov

GSI Helmholtz Centre for Heavy Ion Research

A. Klimkiewicz

GSI Helmholtz Centre for Heavy Ion Research

T. Kurtukian

Universidade de Santiagode Compostela

N. Kurz

GSI Helmholtz Centre for Heavy Ion Research

Kristian Larsson

Chalmers, Applied Physics, Subatomic Physics

T. Le Bleis

GSI Helmholtz Centre for Heavy Ion Research

University of Strasbourg

K. Mahata

GSI Helmholtz Centre for Heavy Ion Research

Paul Scherrer Institut

L. Maier

Technical University of Munich

Thomas Nilsson

Chalmers, Applied Physics, Subatomic Physics

C. Nociforo

GSI Helmholtz Centre for Heavy Ion Research

Göran Hugo Nyman

Chalmers, Applied Physics, Subatomic Physics

C. Pascual-Izarra

CSIC - Instituto de Estructura de la Materia (IEM)

A. Perea

CSIC - Instituto de Estructura de la Materia (IEM)

D. Perez

Universidade de Santiagode Compostela

A. Prochazka

GSI Helmholtz Centre for Heavy Ion Research

Comenius University in Bratislava

C. Rodriguez-Tajes

Universidade de Santiagode Compostela

D. Rossi

Johannes Gutenberg University Mainz

H. Schaffner

GSI Helmholtz Centre for Heavy Ion Research

G. Schrieder

Technische Universität Darmstadt

H. Simon

GSI Helmholtz Centre for Heavy Ion Research

B. Sitar

Comenius University in Bratislava

M. Stanoiu

GSI Helmholtz Centre for Heavy Ion Research

K. Suemmerer

GSI Helmholtz Centre for Heavy Ion Research

Olof Tengblad

CSIC - Instituto de Estructura de la Materia (IEM)

H. Weick

GSI Helmholtz Centre for Heavy Ion Research

S. Winkler

Technical University of Munich

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-

Subject Categories

Subatomic Physics

Physical Sciences

Roots

Basic sciences

DOI

10.1140/epja/i2012-12191-5

More information

Latest update

2/8/2019 1