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.

ti-55

exotic nuclei

shell-model

n=32

heavy-ions

Författare

S. Schwertel

Technische Universität München

P. Maierbeck

Technische Universität München

R. Krucken

Technische Universität München

University of British Columbia (UBC)

TRIUMF

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

CSIC - Instituto de Estructura de la Materia (IEM)

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

Helmholtz

Saint Mary's University

TRIUMF

O. Kiselev

Helmholtz

Paul Scherrer Institut

Johannes Gutenberg-Universität Mainz

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

Helmholtz

Université de Strasbourg

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

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

Univerzita Komenskeho v Bratislave

Helmholtz

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

CSIC - Instituto de Estructura de la Materia (IEM)

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-

Ämneskategorier

Subatomär fysik

Fysik

Fundament

Grundläggande vetenskaper

DOI

10.1140/epja/i2012-12191-5

Mer information

Senast uppdaterat

2020-09-15