Coulomb excitation of Mg-31

M. Seidlitz, D. Muecher, P. Reiter, V. Bildstein, A. Blazhev, N. Bree, B. Bruyneel, J. Cederkall, E. Clement, T. Davinson, P. Van Duppen, A. Ekstrom, F. Finke, L. M. Fraile, K. Geibel, R. Gernhaeuser, H. Hess, A. Holler, M. Huyse, O. IvanovJ. Jolie, M. Kalkuehler, T. Kotthaus, R. Kruecken, R. Lutter, E. Piselli, H. Scheit, I. Stefanescu, J. Van de Walle, D. Voulot, N. Warr, F. Wenander, A. Wiens

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Abstract

The ground state properties of Mg-31 indicate a change of nuclear shape at N = 19 with a deformed J(pi) = 1/2(+) intruder state as a ground state, implying that Mg-31 is part of the "island of inversion". The collective properties of excited states were the subject of a Coulomb excitation experiment at REX-ISOLDE, CERN, employing a radioactive Mg-31 beam. De-excitation gamma-rays were detected by the MINIBALL gamma-spectrometer in coincidence with scattered particles in a segmented Si-detector. The level scheme of Mg-3I was extended. Spin and parity assignment of the 945 keV state yielded 5/2(+) and its de-excitation is dominated by a strong collective M1 transition. Comparison of the transition probabilities of Mg-30,Mg-31,Mg-32 establishes that for the N = 19 magnesium isotope not only the ground state but also excited states are largely dominated by a deformed pf intruder configuration. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalPhysics Letters B
Volume700
Issue number3-4
DOIs
Publication statusPublished - 13-Jun-2011

Keywords

  • Coulomb excitation
  • ISOL
  • Reduced transition matrix element
  • Island of inversion
  • INTRUDER CONFIGURATIONS
  • COLLECTIVITY
  • DEFORMATION
  • INVERSION
  • DETECTOR
  • REGION
  • MASSES
  • ISLAND
  • STATE

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