Coulomb breakup of neutron-rich Na-29,Na-30 isotopes near the island of inversion
Journal article, 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.

neutron-rich nulei

Coulomb breakup

ground state configuration

spectroscopic factor

RIB

island of inversion

Author

A. Rahaman

Saha Institute of Nuclear Physics

U. Datta

Helmholtz

Saha Institute of Nuclear Physics

T. Aumann

Technische Universität Darmstadt

Helmholtz

S. Beceiro-Novo

Universidade de Santiagode Compostela

K. Boretzky

Helmholtz

C. Caesar

Helmholtz

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

Helmholtz

O. Ershova

Helmholtz

L.M. Fraile

Complutense University

H. Geissel

Helmholtz

II. Physikalisches Institut

D. Gonzalez-Diaz

Helmholtz

Håkan T Johansson

Chalmers, Physics, Subatomic and Plasma Physics

Björn Jonson

Chalmers, Physics, Subatomic and Plasma Physics

N. Kalantar-Nayestanaki

Kernfysisch Versneller Institut

T. Kroll

Technische Universität Darmstadt

R. Krucken

Technical University of Munich

J. Kurcewicz

Helmholtz

C. Langer

Helmholtz

T. Le Bleis

Technical University of Munich

Y. Leifels

Helmholtz

J. Marganiec

Helmholtz

G. Munzenberg

Helmholtz

M. A. Najafi

Kernfysisch Versneller Institut

Thomas Nilsson

Chalmers, Physics, Subatomic and Plasma Physics

C. Nociforo

Helmholtz

V. Panin

Helmholtz

S. Paschalis

Technische Universität Darmstadt

R. Plag

Helmholtz

R. Reifarth

Helmholtz

M. V. Ricciardi

Helmholtz

C. Rigollet

Kernfysisch Versneller Institut

D. Rossi

Helmholtz

C. Scheidenberger

II. Physikalisches Institut

Helmholtz

H. Scheit

Technische Universität Darmstadt

H. Simon

Helmholtz

J. T. Taylor

University of Liverpool

Y. Togano

Helmholtz

S. Typel

Helmholtz

V. Volkov

Technische Universität Darmstadt

A. Wagner

Helmholtz

F. Wamers

Helmholtz

H. Weick

Helmholtz

M. Weigand

Helmholtz

J. S. Winfield

Helmholtz

D. Yakorev

Helmholtz

M. Zoric

Helmholtz

Journal of Physics G: Nuclear and Particle Physics

0954-3899 (ISSN)

Vol. 44 4 045101-

Experimental studies of exotic, light nuclear systems - combining front-line physics and FAIR preparations

Swedish Research Council (VR), 2012-01-01 -- 2014-12-31.

Subject Categories

Subatomic Physics

Physical Sciences

Roots

Basic sciences

DOI

10.1088/1361-6471/aa594d

More information

Latest update

9/15/2020