Edinburgh Research Explorer

Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion

Research output: Contribution to journalArticle

  • M. Seidlitz
  • P. Reiter
  • R. Altenkirch
  • B. Bastin
  • C. Bauer
  • A. Blazhev
  • N. Bree
  • B. Bruyneel
  • P. A. Butler
  • J. Cederkall
  • H. De Witte
  • D. D. DiJulio
  • J. Diriken
  • L. P. Gaffney
  • K. Geibel
  • G. Georgiev
  • R. Gernhaeuser
  • M. Huyse
  • N. Kesteloot
  • T. Kroell
  • R. Kruecken
  • R. Lutter
  • J. Pakarinen
  • F. Radeck
  • M. Scheck
  • D. Schneiders
  • B. Siebeck
  • C. Sotty
  • T. Steinbach
  • J. Taprogge
  • P. Van Duppen
  • J. Van de Walle
  • D. Voulot
  • N. Warr
  • F. Wenander
  • K. Wimmer
  • K. Wrzosek-Lipska

Related Edinburgh Organisations

Original languageEnglish
Article number024309
Number of pages10
JournalPhysical Review C
Volume89
Issue number2
DOIs
Publication statusPublished - 19 Feb 2014

Abstract

Nuclear shell evolution in neutron-rich Na nuclei around N = 20 was studied by determining reduced transition probabilities, i.e., B(E2) and B(M1) values, in order to map the border of the island of inversion. To this end Coulomb-excitation experiments, employing radioactive Na-29,Na-30 beams with a final beam energy of 2.85 MeV/nucleon, were performed at REX-ISOLDE, CERN. De-excitation gamma rays were detected by the MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a segmented Si detector. Transition probabilities to excited states were deduced. The measured B(E2) values agree well with shell-model predictions, supporting the idea that in the Na isotopic chain the ground-state wave function contains significant intruder admixture already at N = 18, with N = 19 having an almost pure two-particle-two-hole deformed ground-state configuration.

    Research areas

  • NUCLEAR-DATA SHEETS, SHELL-MODEL, REGION, BEAM, SPECTROMETER, COLLECTIVITY, DEFORMATION, CHALLENGES, FRONTIERS, MINIBALL

ID: 15275216