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

Rahaman, A, Datta, U, Aumann, T, Beceiro-Novo, S, Boretzky, K, Caesar, C, Carlson, BV, Catford, Wilton, Chakraborty, S, Chartier, M , Cortina-Gil, D, De Angelis, G, Diaz Fernandez, P and Emling, H (2017) Coulomb breakup of neutron-rich 29,30Na isotopes near the island of inversion Journal of Physics G: Nuclear and Particle Physics.

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Abstract

First results are reported on the ground state configurations of the neutron-rich 29,30Na 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 208Pb target at energies of 400-430 MeV/nucleon using the FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated inclusive Coulomb-dissociation cross-sections (CD) of 89 (7) mb and 167 (13) mb for one neutron removal from 29Na and 30Na, 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 29Na(3/2+) and 30Na(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 28Nags(1+) ⊗ νs,d and 29Nags(3/2+) ⊗ νs,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 30Na.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Rahaman, AUNSPECIFIEDUNSPECIFIED
Datta, UUNSPECIFIEDUNSPECIFIED
Aumann, TUNSPECIFIEDUNSPECIFIED
Beceiro-Novo, SUNSPECIFIEDUNSPECIFIED
Boretzky, KUNSPECIFIEDUNSPECIFIED
Caesar, CUNSPECIFIEDUNSPECIFIED
Carlson, BVUNSPECIFIEDUNSPECIFIED
Catford, WiltonW.Catford@surrey.ac.ukUNSPECIFIED
Chakraborty, SUNSPECIFIEDUNSPECIFIED
Chartier, MUNSPECIFIEDUNSPECIFIED
Cortina-Gil, DUNSPECIFIEDUNSPECIFIED
De Angelis, GUNSPECIFIEDUNSPECIFIED
Diaz Fernandez, PUNSPECIFIEDUNSPECIFIED
Emling, HUNSPECIFIEDUNSPECIFIED
Date : 1 August 2017
Identification Number : 10.1088/1361-6471/aa594d
Copyright Disclaimer : Copyright 2017 IOP Publishing Ltd. As the Version of Record of this article is going to be/has been published on a subscription basis, this Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period.
Uncontrolled Keywords : neutron-rich nuclei, island of inversion, radioactive ion beam, Coulomb breakup, ground state configuration, spectroscopic factor
Depositing User : Symplectic Elements
Date Deposited : 01 Feb 2017 12:37
Last Modified : 19 Jul 2017 09:33
URI: http://epubs.surrey.ac.uk/id/eprint/813423

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