Direct determination of ground-state transition widths of low-lying dipole states in 140 Ce with the self-absorption technique

Article English OPEN
Romig, C.Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany ; Savran, D.(ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, D-64291, Germany) ; Beller, J.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) ; Birkhan, J.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) ; Endres, A.(Institut für Angewandte Physik, Goethe Universität Frankfurt am Main, Frankfurt am Main, D-60438, Germany) ; Fritzsche, M.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) ; Glorius, J.(Institut für Angewandte Physik, Goethe Universität Frankfurt am Main, Frankfurt am Main, D-60438, Germany) ; Isaak, J.(ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, D-64291, Germany) ; Pietralla, N.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) ; Scheck, M.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) ; Schnorrenberger, L.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) ; Sonnabend, K.(Institut für Angewandte Physik, Goethe Universität Frankfurt am Main, Frankfurt am Main, D-60438, Germany) ; Zweidinger, M.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany) (2015)
  • Publisher: Elsevier
  • Journal: volume 744, pages 369-374 (issn: 0370-2693)
  • Related identifiers: doi: 10.1016/j.physletb.2015.04.013
  • Subject: Nuclear resonance fluorescence | Self absorption | Gamma spectroscopy | Pygmy dipole resonance | Physics | Ground-state transition width | QC1-999 | Nuclear and High Energy Physics

The technique of self absorption has been applied for the first time to study the decay pattern of low-lying dipole states of 140Ce. In particular, ground-state transition widths Γ0 and branching ratios Γ0Γ to the ground state have been investigated in the energy domain of the pygmy dipole resonance. Relative self-absorption measurements allow for a model-independent determination of Γ0. Without the need to perform a full spectroscopy of all decay channels, also the branching ratio to the ground state can be determined. The experiment on 140Ce was conducted at the bremsstrahlung facility of the superconducting Darmstadt electron linear accelerator S-DALINAC. In total, the self-absorption and, thus, Γ0 were determined for 104 excited states of 140Ce. The obtained results are presented and discussed with respect to simulations of γ cascades using the DICEBOX code. Keywords: Self absorption, Nuclear resonance fluorescence, Gamma spectroscopy, Ground-state transition width, Pygmy dipole resonance
Share - Bookmark