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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14 Citations (Scopus)


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
Issue number1
Publication statusPublished - 19 Jan 2016


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


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