Coulomb breakup of neutron-rich Na-29,Na-30 isotopes near the island of inversion
Artikel i vetenskaplig tidskrift, 2017

First results are reported on the ground state configurations of the neutron-rich Na-29,Na-30 isotopes, obtained via Coulomb dissociation (CD) measurements. The invariant mass spectra of these nuclei have been obtained through measurement of the four-momenta of all decay products after Coulomb excitation of those nuclei on a Pb-208 target at energies of 400-430 MeV/nucleon using the FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated inclusive CD cross-sections (CD) of 89 (7) mb and 167 (13) mb for one neutron removal from Na-29 and Na-30, respectively, have been extracted up to an excitation energy of 10 MeV. The major part of one neutron removal, CD cross-sections of those nuclei populate the core, in its ground state. A comparison with the direct breakup model, suggests the predominant occupation of the valence neutron in the ground state of Na-29 (3/2(+)) and Na-30 (2(+)) is the d-orbital with a small contribution from the s-orbital, which are coupled with the ground state of the core. One of the major components of the ground state configurations of these nuclei are Na-28(gs)(1(+)) circle times v(s,d) and Na-29(gs)(3/2(+)) circle times v(s,d), respectively. The ground state spin and parity of these nuclei obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the s and d orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with shell model calculation using the MCSM suggests a lower limit of around 4.3 MeV of the sd-pf shell gap in Na-30.

ground state configuration

Coulomb breakup

spectroscopic factor

RIB

island of inversion

neutron-rich nulei

Författare

A. Rahaman

Saha Institute of Nuclear Physics

U. Datta

GSI Helmholtz Centre for Heavy Ion Research GmbH

Saha Institute of Nuclear Physics

T. Aumann

GSI Helmholtz Centre for Heavy Ion Research GmbH

Technische Universität Darmstadt

S. Beceiro-Novo

Universidade de Santiagode Compostela

K. Boretzky

GSI Helmholtz Centre for Heavy Ion Research GmbH

C. Caesar

GSI Helmholtz Centre for Heavy Ion Research GmbH

B. V. Carlson

Instituto Tecnológico de Aeronáutica (ITA)

W. N. Catford

University of Surrey

S. Chakraborty

Saha Institute of Nuclear Physics

M. Chartier

University of Liverpool

D. Cortina-Gil

Universidade de Santiagode Compostela

G. de Angelis

Laboratori Nazionali di Legnaro

Paloma Diaz Fernandez

Universidade de Santiagode Compostela

H. Emling

GSI Helmholtz Centre for Heavy Ion Research GmbH

O. Ershova

GSI Helmholtz Centre for Heavy Ion Research GmbH

L.M. Fraile

Universidad Complutense de Madrid

H. Geissel

GSI Helmholtz Centre for Heavy Ion Research GmbH

II. Physikalisches Institut

D. Gonzalez-Diaz

GSI Helmholtz Centre for Heavy Ion Research GmbH

Håkan T Johansson

Chalmers, Fysik, Subatomär fysik och plasmafysik

Björn Jonson

Chalmers, Fysik, Subatomär fysik och plasmafysik

N. Kalantar-Nayestanaki

Kernfysisch Versneller Institut

T. Kroll

Technische Universität Darmstadt

R. Krucken

Technische Universität München

J. Kurcewicz

GSI Helmholtz Centre for Heavy Ion Research GmbH

C. Langer

GSI Helmholtz Centre for Heavy Ion Research GmbH

T. Le Bleis

Technische Universität München

Y. Leifels

GSI Helmholtz Centre for Heavy Ion Research GmbH

J. Marganiec

GSI Helmholtz Centre for Heavy Ion Research GmbH

G. Munzenberg

GSI Helmholtz Centre for Heavy Ion Research GmbH

M. A. Najafi

Kernfysisch Versneller Institut

Thomas Nilsson

Chalmers, Fysik, Subatomär fysik och plasmafysik

C. Nociforo

GSI Helmholtz Centre for Heavy Ion Research GmbH

V. Panin

GSI Helmholtz Centre for Heavy Ion Research GmbH

S. Paschalis

Technische Universität Darmstadt

R. Plag

GSI Helmholtz Centre for Heavy Ion Research GmbH

R. Reifarth

GSI Helmholtz Centre for Heavy Ion Research GmbH

M. V. Ricciardi

GSI Helmholtz Centre for Heavy Ion Research GmbH

C. Rigollet

Kernfysisch Versneller Institut

D. Rossi

GSI Helmholtz Centre for Heavy Ion Research GmbH

C. Scheidenberger

II. Physikalisches Institut

GSI Helmholtz Centre for Heavy Ion Research GmbH

H. Scheit

Technische Universität Darmstadt

H. Simon

GSI Helmholtz Centre for Heavy Ion Research GmbH

J. T. Taylor

University of Liverpool

Y. Togano

GSI Helmholtz Centre for Heavy Ion Research GmbH

S. Typel

GSI Helmholtz Centre for Heavy Ion Research GmbH

V. Volkov

Technische Universität Darmstadt

A. Wagner

Helmholtz-Zentrum Dresden-Rossendorf

F. Wamers

GSI Helmholtz Centre for Heavy Ion Research GmbH

H. Weick

GSI Helmholtz Centre for Heavy Ion Research GmbH

M. Weigand

GSI Helmholtz Centre for Heavy Ion Research GmbH

J. S. Winfield

GSI Helmholtz Centre for Heavy Ion Research GmbH

D. Yakorev

Helmholtz-Zentrum Dresden-Rossendorf

M. Zoric

GSI Helmholtz Centre for Heavy Ion Research GmbH

Journal of Physics G: Nuclear and Particle Physics

0954-3899 (ISSN)

Vol. 44 045101-

Ämneskategorier

Subatomär fysik

DOI

10.1088/1361-6471/aa594d