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.
ground state configuration
Coulomb breakup
spectroscopic factor
island of inversion
RIB
neutron-rich nulei
Author
A. Rahaman
Saha Institute of Nuclear Physics
U. Datta
Helmholtz Association of German Research Centres
Saha Institute of Nuclear Physics
T. Aumann
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
S. Beceiro-Novo
Universidade de Santiagode Compostela
K. Boretzky
Helmholtz Association of German Research Centres
C. Caesar
Helmholtz Association of German Research Centres
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 Association of German Research Centres
O. Ershova
Helmholtz Association of German Research Centres
L.M. Fraile
Complutense University
H. Geissel
Justus Liebig University Giessen
Helmholtz Association of German Research Centres
D. Gonzalez-Diaz
Helmholtz Association of German Research Centres
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 Association of German Research Centres
C. Langer
Helmholtz Association of German Research Centres
T. Le Bleis
Technical University of Munich
Y. Leifels
Helmholtz Association of German Research Centres
J. Marganiec
Helmholtz Association of German Research Centres
G. Munzenberg
Helmholtz Association of German Research Centres
M. A. Najafi
Kernfysisch Versneller Institut
Thomas Nilsson
Chalmers, Physics, Subatomic and Plasma Physics
C. Nociforo
Helmholtz Association of German Research Centres
V. Panin
Helmholtz Association of German Research Centres
S. Paschalis
Technische Universität Darmstadt
R. Plag
Helmholtz Association of German Research Centres
R. Reifarth
Helmholtz Association of German Research Centres
M. V. Ricciardi
Helmholtz Association of German Research Centres
C. Rigollet
Kernfysisch Versneller Institut
D. Rossi
Helmholtz Association of German Research Centres
C. Scheidenberger
Justus Liebig University Giessen
Helmholtz Association of German Research Centres
H. Scheit
Technische Universität Darmstadt
H. Simon
Helmholtz Association of German Research Centres
J. T. Taylor
University of Liverpool
Y. Togano
Helmholtz Association of German Research Centres
S. Typel
Helmholtz Association of German Research Centres
V. Volkov
Technische Universität Darmstadt
A. Wagner
Helmholtz Association of German Research Centres
F. Wamers
Helmholtz Association of German Research Centres
H. Weick
Helmholtz Association of German Research Centres
M. Weigand
Helmholtz Association of German Research Centres
J. S. Winfield
Helmholtz Association of German Research Centres
D. Yakorev
Helmholtz Association of German Research Centres
M. Zoric
Helmholtz Association of German Research Centres
Journal of Physics G: Nuclear and Particle Physics
0954-3899 (ISSN) 13616471 (eISSN)
Vol. 44 4 045101- 045101Experimental studies of exotic, light nuclear systems - combining front-line physics and FAIR preparations
Swedish Research Council (VR) (2011-5324), 2012-01-01 -- 2014-12-31.
Subject Categories (SSIF 2011)
Subatomic Physics
Physical Sciences
Roots
Basic sciences
DOI
10.1088/1361-6471/aa594d