Luminescence (OSL, Post-IR-IRSL) efficiency dependence on x-ray energy: measurements and implications for dating

International audienc

Luminescence (OSL, Post-IR-IRSL) efficiency dependence on x-ray energy: measurements and implications for dating

International audienc

A new setup for neutron inelastic cross section measurements

An upgraded detection setup for neutron scattering measurements was recently completed at the GELINA neutron source of IRMM. A 200 m flight path is used. Eight HPGe detectors are placed at 110° and 150° with respect to the neutron beam and are read-out by fast digitizers. The neutron flux is monitored by a 235U fission chamber. The first inelastic scattering measurement with the new setup was performed for natFe

LASER INDUCED STRUCTURAL TRANSFORMATION IN AISI 430 STEEL

AISI 430 steel plates have been irradiated with 2kW cw CO2 laser. Optical and transmission electron microscopy studies, revealed that the carbides existent before irradiation are dissolved in the irradiated zone where the steel was melted. After solidification, an uniform distribution of the ε - carbide precipitates, 50 - 100 nm in size, appeared. The precipitation process was connected with the diffusion at dislocation core and with dislocation displacements and multiplications

Laser induced phase transition in iron thin films

No abstract availabl

Evaluation of the 103

New capture and transmission measurements have been performed at GELINA to improve the neutron induced cross-section data for 103Rh in the resonance region. This contribution refers to the evaluation of the neutron cross-section data of 103Rh in the unresolved resonance region. The capture measurements were done at a 30 m measurement station using C6D6 detectors and applying the total energy detection principle in combination with the pulse height weighting technique. The transmission measurements were performed at a 50 m station using 6Li-glass scintillators as neutron detectors. The experimental data have been processed with the AGS code, which includes a full propagation of both correlated and uncorrelated uncertainties. The experimental data are interpreted in terms of average resonance parameters using a generalized single level representation. A link to a dispersive coupled-channel optical model is used for information about the energy dependence of the distant level parameters and the neutron strength functions. This link becomes especially valuable when a dispersive potential as the one derived here is employed after being optimized in a wide energy region. Thus, the consistency between the resonance and the high energy region is ensured

On the theoretical description of the early oxidation stages of copper by cw CO2 laser irradiation

An analysis is performed concerning the application of the available theoretical interpretations in analysing the new experimental data obtained in the study of the early stages of the cw CO2 laser oxidation of copper targets.On étudie l'application des interprétations théoriques disponibles à l'analyse de nouvelles données expérimentales obtenues en étudiant les premières étapes de l'oxydation de cibles en cuivre sous irradiation laser CO2 continu

Target requirements for neutron-induced cross-section measurements in the resonance region

The influence of target characteristics on results of neutron-induced cross-section measurements is discussed. The basic principles of total and reaction cross-section experiments are described. The discussion shows that each application needs targets with specific requirements, which are characterized for quantities, such as the total number of nuclei per unit area, effective area and homogeneity. The result of such a characterization can have a strong impact on the total uncertainty of the quantities deduced from the measured data. Based on the measurement principles and on practical experience, recommendations for specific cross-section measurements are presented. These recommendations refer to both the target properties and to the methods used for target characterization. In addition, a characterization method based on the use of neutron resonances is presented. This method can be used to determine the presence and quantity of contaminants and impurities which have a strong impact on the results of cross-section measurements