Direct Determination of Ground-State Transition Widths and Natural Level Widths with the Method of Relative Self Absorption
1 Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt Germany
2 Institut für Angewandte Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt a.M., Germany
3 ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
4 Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, 60438 Frankfurt a.M., Germany
5 School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
6 SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom
a e-mail: email@example.com
Published online: 28 May 2015
The method of relative self absorption is based on the technique of nuclear resonance fluorescence measurements. It allows for a model-independent determination of ground-state transition widths, natural level widths, and, consequently, of branching ratios to the ground state for individual excitations. Relative self–absorption experiments have been performed on the nuclei 6Li and 140Ce. In order to investigate the total level width for the 0+1, T = 1 level at 3563 keV in 6Li, a high-precision self-absorption measurement has been performed. In the case of 140Ce, self absorption has been applied for the first time to study decay widths of dipole-excited states in the energy regime of the pygmy dipole resonance.
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