QPM Analysis of 205Tl Nuclear Excitations below the Giant Dipole Resonance
1 Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
2 ExtreMe Matter Institute EMMI and Research Division, GSI, 64291 Darmstadt, Germany
3 Frankfurt Institute FIAS, 60438 Frankfurt am Main, Germany
4 Department of Physics, North Carolina State University Raleigh, North Carolina 27695, USA
5 Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
6 Department of Physics, Duke University, Durham, North Carolina 27708, USA
7 Institut für Angewandte Physik, Goethe Universität Frankfurt am Main 60438 Frankfurt am Main, Germany
Published online: 28 May 2015
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.
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