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

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

doi:10.1051/epjconf/20159301044

All issues

Volume 93 (2015)

EPJ Web of Conferences, 93 (2015) 01044

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 93, 2015 CGS15 – Capture Gamma-Ray Spectroscopy and Related Topics


Article Number		01044
Number of page(s)		2
Section		Nuclear Structure
DOI		https://doi.org/10.1051/epjconf/20159301044
Published online		28 May 2015

EPJ Web of Conferences 93, 01044 (2015)
https://doi.org/10.1051/epjconf/20159301044

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

N. Benouaret¹, J. Beller¹, J. Isaak²^,3, J.H. Kelley⁴^,5, H. Pai¹, N. Pietralla¹, V.Yu. Ponomarev¹, R. Raut⁵^,6, C. Romig¹, G. Rusev⁵^,6, D. Savran²^,3, M. Scheck¹, L. Schnorrenberger¹, K. Sonnabend⁷, A.P. Tonchev⁵^,6, W. Tornow⁵^,6, H.R. Weller⁵^,6 and M. Zweidinger¹

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

Abstract

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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