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Abstract
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 6 Li and 140 Ce. In order to investigate the total level width for the 0+ 1 , T = 1 level at 3563 keV in 6 Li, a high-precision self-absorption measurement has been performed. In the case of 140 Ce, 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.
Highlights
The method of relative self absorption is based on the technique of nuclear resonance fluorescence measurements
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
The Relative Self-Absorption (RSA) [1, 2] approach allows for the direct determination of ground-state transition widths Γ0, of natural level widths Γ, and, as a consequence, of branching ratios Γ0/Γ to the ground state of individual states in a model-independent way
Summary
The Relative Self-Absorption (RSA) [1, 2] approach allows for the direct determination of ground-state transition widths Γ0, of natural level widths Γ, and, as a consequence, of branching ratios Γ0/Γ to the ground state of individual states in a model-independent way. The excitation and the decay pattern of individual states can be investigated at the same time. NRF measurements exploiting the quasi-monochromatic γ-ray beams provided by the High Intensity γ-Ray Source (HIγS) [7] at Triangle Universities Nuclear Laboratory (TUNL) in Durham, NC, USA have been performed to investigate the average decay pattern of dipole-excited states in the energy regime of the Pygmy Dipole Resonance (PDR) [8,9,10,11,12]. A determination of Γ0 and Γ0/Γ for individual states is highly desirable to provide new information on the decay pattern of the PDR. The results achieved from both measurements will be presented and discussed
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