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ANR TATTOO - Coopération sur les cibles minces d'actinide

By Christelle Stodel

What
When 2018-03-20
from 11:30 am à 12:30 pm
Where Salle 105
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Thin actinide layers deposited on various substrates are widely used in fundamental and applied research in nuclear chemistry and -physics, e.g., in studies of nuclear fission dynamics and prompt neutron- or g-ray spectroscopy, in nuclear reaction studies with heavy ions, and studies of chemical and physical properties of super-heavy elements (SHE, Z > 103). Other applications include the study of nuclear transitions in 229Th harvested as a-decay recoil product from its 233U precursor or the calibration of neutron detectors in neutron metrology. The requirements on the substrate are manifold and depend on the experimental conditions. For SHE research very thin (2 μm) foils of Ti or Al are used. For special ion-ion-collision experiments or for studies of the nuclear fission kinetics ultra-thin carbon or polymer-foils are required, whereas for fission fragment detection in neutron metrology Si-wafers (200 μm thick) with an ultra-smooth surface are employed. Molecular Plating (MP) - the deposition of actinides from organic solvents - is currently the only fabrication method in cases where the desired actinide material is available only in very limited amounts or possesses a high specific activity. Despite the wide use of MP since decades, few attempts were reported where a microscopic characterization of the layers was performed and only in recent years research on the deposition mechanism, the deposition kinetics and the chemical nature of the actinide deposit was conducted. Thus, the TATTOO project aims to develop new fabrication methods for actinide targets on various substrates for applications ranging from heavy ion collision experiments to nuclear structure studies and neutron metrology. This includes the deposition of actinides from ionic liquids and the development of a set-up employing the so-called “Drop on Demand” technique as used e.g. in ink-jet printers for the production of targets of various size and geometry. Furthermore, we propose to conduct intense research on the characterization of the deposit in terms of layer homogeneity and – morphology as well as on the chemical form of the deposit. The targets will then be irradiated either with intense heavy ions beams or with neutrons of different energies to check for target performance under realistic experimental conditions. Subsequent to irradiation layer characterization will be repeated to investigate changes in layer morphology and – connected to that – check for possible layer-backing interactions that might alter the target properties during irradiation. Within the frame of the TATTOO project, novel production techniques for actinide targets will be developed for efficient material use, including substrates that do not interfere with the detection of the nuclear reaction products, which result in more durable targets with reproducible characteristics, and which can be remotely performed, if required. 

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