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oe1(光电查) - 科学论文

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  • Direct Determination of Ground-State Transition Widths and Natural Level Widths with the Method of Relative Self Absorption

    摘要： The method of relative self absorption is based on the technique of nuclear resonance ?uorescence 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 ?rst time to study decay widths of dipole-excited states in the energy regime of the pygmy dipole resonance.

    关键词： 6Li,natural level widths,nuclear resonance fluorescence,ground-state transition widths,140Ce,branching ratios,relative self absorption,pygmy dipole resonance

    更新于2025-09-23 15:21:21

  • Uncertainties of optical-model parameters for the study of the threshold anomaly

    摘要： In the analysis of elastic-scattering experimental data, optical-model parameters (usually, depths of real and imaginary potentials) are (cid:12)tted and conclusions are drawn analyzing their variations at bombardment energies close to the Coulomb barrier (threshold anomaly). The judgement about the shape of this variation (related to the physical processes producing this anomaly) depends on these (cid:12)tted values but the robustness of the conclusions strongly depends on the uncertainties with which these parameters are derived. We will show that previous published studies have not used a common criterium for the evaluation of the parameter uncertainties. In this work, a study of these uncertainties is presented, using conventional statistic tools as well as bootstrapping techniques. As case studies, these procedures are applied to re-analyze detailed elastic-scattering data for the 12C + 208Pb and the 6Li + 80Se systems.

    关键词： elastic-scattering,optical-model parameters,12C + 208Pb,6Li + 80Se,bootstrap techniques,threshold anomaly

    更新于2025-09-04 15:30:14