Low-lying isovector 2(+) valence-shell excitations of Po-212

D. Kocheva, G. Rainovski, J. Jolie, N. Pietralla, C. Stahl, P. Petkov, A. Blazhev, A. Hennig, A. Astier, Th. Braunroth, M. L. Cortes, A. Dewald, M. Djongolov, C. Fransen, K. Gladnishki, V. Karayonchev, J. Litzinger, C. Mueller-Gatermann, M. Scheck, Ph. ScholzR. Stegmann, P. Thoele, V. Werner, W. Witt, D. Woelk, P. Van Isacker

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13 Citations (Scopus)

Abstract

We present the results from an experiment dedicated to search for quadrupole-collective isovector valence-shell excitations, states with so-called mixed proton-neutron symmetry (MSS), of 212Po. This nucleus was studied in an
α-transfer reaction. The lifetimes of two short-lived excited states, candidates for the one-phonon MSS, were determined by utilizing the Doppler shift attenuation method. The experimental results are in qualitative agreement with a simple single-j shell model calculation, which, together with the observed lack of quadrupole collectivity, indicates that the isovector nature of low-lying states is a property of the leading single-particle valence shell configuration.
Original languageEnglish
Article number011303
JournalPhysical Review C
Volume93
Issue number1
DOIs
Publication statusPublished - 19 Jan 2016

Keywords

  • Nuclear-data sheets
  • collective modes
  • mixed-symmetry
  • states
  • spectroscopy
  • beam

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