EPJ Web of Conferences (Jan 2015)

QPM Analysis of 205Tl Nuclear Excitations below the Giant Dipole Resonance

  • Benouaret N.,
  • Beller J.,
  • Isaak J.,
  • Kelley J.H.,
  • Pai H.,
  • Pietralla N.,
  • Ponomarev V.Yu.,
  • Raut R.,
  • Romig C.,
  • Rusev G.,
  • Savran D.,
  • Scheck M.,
  • Schnorrenberger L.,
  • Sonnabend K.,
  • Tonchev A.P.,
  • Tornow W.,
  • Weller H.R.,
  • Zweidinger M.

DOI
https://doi.org/10.1051/epjconf/20159301044
Journal volume & issue
Vol. 93
p. 01044

Abstract

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We analysed our experimental recent findings of the dipole response of the odd-mass stable nucleus 205Tl within the quasi-particle phonon model. Using the phonon basis constructed for the neighbouring 204Hg and wave function configurations for 205Tl consisting of a mixture of quasiparticle ⊗ N-phonon configurations (N=0,1,2), only one group of fragmented dipole excited states has been reproduced at 5.5 MeV in comparison to the experimental distribution which shows a second group at about 5 MeV. The computed dipole transition strengths are mainly of E1 character which could be associated to the pygmy dipole resonance.