999 resultados para 7136-112


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Metallic catcher foils have been investigated on their thermal release capabilities for future superheavy element studies. These catcher materials shall serve as connection between production and chemical investigation of superheavy elements (SHE) at vacuum conditions. The diffusion constants and activation energies of diffusion have been extrapolated for various catcher materials using an atomic volume based model. Release rates can now be estimated for predefined experimental conditions using the determined diffusion values. The potential release behavior of the volatile SHE Cn (E112), E113, Fl (E114), E115, and Lv (E116) from polycrystalline, metallic foils of Ni, Y, Zr, Nb, Mo, Hf, Ta, and W is predicted. Example calculations showed that Zr is the best suited material in terms of on-line release efficiency and long-term operation stability. If higher temperatures up to 2773 K are applicable, tungsten is suggested to be the material of choice for such experiments.

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Die Foliierung geht nur bis Bl. 552; zusätzlich gibt es die Blätter 229a, 319a, 488a und 508a; das Blatt 373 wurde bei der Foliierung übersprungen.

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Vorbesitzer: Abraham Merzbacher

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Vorbesitzer: Bartholomaeusstift Frankfurt am Main

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Vorbesitzer: Simon von Stöffeln; Kloster Bronnbach; Kloster Neustadt a. M.; Fürstlich Löwenstein-Rosenbergische Hofbibliothek Klein-Heubach; Freiherrlich Carl von Rothschild'sche Bibliothek Frankfurt am Main

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u.a.: Besuchsankündigung in Hamburg; Willings;

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Vorbesitzer: Dominikanerkloster Frankfurt am Main