8 results on '"Mokry, Christoph"'
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2. Alpha spectrometric characterization of thin 233U sources for 229(m)Th production
- Author
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Haas, Raphael, primary, Hufnagel, Michelle, additional, Abrosimov, Roman, additional, Düllmann, Christoph E., additional, Krupp, Dominik, additional, Mokry, Christoph, additional, Renisch, Dennis, additional, Runke, Jörg, additional, and Scherer, Ulrich W., additional
- Published
- 2020
- Full Text
- View/download PDF
3. Alpha spectrometric characterization of thin 233U sources for 229(m)Th production.
- Author
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Haas, Raphael, Hufnagel, Michelle, Abrosimov, Roman, Düllmann, Christoph E., Krupp, Dominik, Mokry, Christoph, Renisch, Dennis, Runke, Jörg, and Scherer, Ulrich W.
- Subjects
SILICON surfaces ,PASSIVATION ,ION sources ,SCANNING electron microscopy ,ALPHA rays - Abstract
Four different techniques were applied for the production of
233 U alpha recoil ion sources, providing229 Th ions. They were compared with respect to a minimum energy spread of the229 Th recoil ions, using the emitted alpha particles as an indicator. The techniques of Molecular Plating, Drop-on-Demand inkjet printing, chelation from dilute nitric acid solution on chemically functionalized silicon surfaces, and self-adsorption on passivated titanium surfaces were used. All fabricated sources were characterized by using alpha spectrometry, radiographic imaging, and scanning electron microscopy. A direct validation for the estimated recoil ion rate was obtained by collecting228 Th recoil ions from232 U recoil ion sources prepared by self-adsorption and Molecular Plating. The chelation and the self-adsorption based approaches appear most promising for the preparation of recoil ion sources delivering monochromatic recoil ions. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
4. Online chemical adsorption studies of Hg, Tl, and Pb on SiO2 and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA
- Author
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Lens, Lotte, primary, Yakushev, Alexander, additional, Düllmann, Christoph Emanuel, additional, Asai, Masato, additional, Ballof, Jochen, additional, Block, Michael, additional, David, Helena May, additional, Despotopulos, John, additional, Di Nitto, Antonio, additional, Eberhardt, Klaus, additional, Even, Julia, additional, Götz, Michael, additional, Götz, Stefan, additional, Haba, Hiromitsu, additional, Harkness-Brennan, Laura, additional, Heßberger, Fritz Peter, additional, Herzberg, Rodi D., additional, Hoffmann, Jan, additional, Hübner, Annett, additional, Jäger, Egon, additional, Judson, Daniel, additional, Khuyagbaatar, Jadambaa, additional, Kindler, Birgit, additional, Komori, Yukiko, additional, Konki, Joonas, additional, Kratz, Jens Volker, additional, Krier, Jörg, additional, Kurz, Nikolaus, additional, Laatiaoui, Mustapha, additional, Lahiri, Susanta, additional, Lommel, Bettina, additional, Maiti, Moumita, additional, Mistry, Andrew K., additional, Mokry, Christoph, additional, Moody, Ken, additional, Nagame, Yuichiro, additional, Omtvedt, Jon Petter, additional, Papadakis, Philippos, additional, Pershina, Valeria, additional, Runke, Jörg, additional, Schädel, Matthias, additional, Scharrer, Paul, additional, Sato, Tetsuya, additional, Shaughnessy, Dawn, additional, Schausten, Brigitta, additional, Thörle-Pospiech, Petra, additional, Trautmann, Norbert, additional, Tsukada, Kazuaki, additional, Uusitalo, Juha, additional, Ward, Andrew, additional, Wegrzecki, Maciej, additional, Wiehl, Norbert, additional, and Yakusheva, Vera, additional
- Published
- 2018
- Full Text
- View/download PDF
5. Production, isolation and characterization of radiochemically pure 163Ho samples for the ECHo-project
- Author
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Dorrer, Holger, primary, Chrysalidis, Katerina, additional, Goodacre, Thomas Day, additional, Düllmann, Christoph E., additional, Eberhardt, Klaus, additional, Enss, Christian, additional, Gastaldo, Loredana, additional, Haas, Raphael, additional, Harding, Jonathan, additional, Hassel, Clemens, additional, Johnston, Karl, additional, Kieck, Tom, additional, Köster, Ulli, additional, Marsh, Bruce, additional, Mokry, Christoph, additional, Rothe, Sebastian, additional, Runke, Jörg, additional, Schneider, Fabian, additional, Stora, Thierry, additional, Türler, Andreas, additional, and Wendt, Klaus, additional
- Published
- 2018
- Full Text
- View/download PDF
6. Production, isolation and characterization of radiochemically pure 163Ho samples for the ECHo-project.
- Author
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Chrysalidis, Katerina, Eberhardt, Klaus, Haas, Raphael, Kieck, Tom, Mokry, Christoph, Schneider, Fabian, Wendt, Klaus, Dorrer, Holger, Düllmann, Christoph E., Harding, Jonathan, Türler, Andreas, Johnston, Karl, Marsh, Bruce, Stora, Thierry, Goodacre, Thomas Day, Rothe, Sebastian, Runke, Jörg, Enss, Christian, Gastaldo, Loredana, and Hassel, Clemens
- Subjects
HOLMIUM isotopes ,RADIOCHEMICAL separation ,ELECTRON capture ,NEUTRINO mass ,PHASE separation ,RARE earth metals - Abstract
Several experiments on the study of the electron neutrino mass are based on high-statistics measurements of the energy spectrum following electron capture of the radionuclide
163 Ho. They rely on the availability of large, radiochemically pure samples of163 Ho. Here, we describe the production, separation, characterization, and sample production within the Electron Capture in Holmium-163 (ECHo) project.163 Ho has been produced by thermal neutron activation of enriched, prepurified162 Er targets in the high flux reactor of the Institut Laue-Langevin, Grenoble, France, in irradiations lasting up to 54 days. Irradiated targets were chemically processed by means of extraction chromatography, which allowed separating the formed Ho from the162 Er target-material and from the main byproducts170 Tm and171 Tm, which are co-produced in GBq amounts. Decontamination factors of >500 for Er and of >105 for Tm and yields of 3.6·1016 and 1.2·1018 atoms of163 Ho were obtained, corresponding to a recovery yield of 95 % of Ho in the chemical separation. The Ho-fraction was characterized by means of γ-ray spectrometry, Inductively-Coupled-Plasma Mass Spectrometry (ICP-MS), Resonance Ionization Mass Spectrometry (RIMS) and Neutron Activation Analysis (NAA). In this process, the thermal neutron capture cross section of163 Ho was measured to σHo-163 to Ho-164m = (23±3) b and σHo-163 to Ho-164g = (156±9) b for the formation of the two isomers of164 Ho. Specific samples were produced for further purification by mass separation to isolate163 Ho from the Ho-isotope mixture, as needed for obtaining the energy spectrum within ECHo. The partial efficiency for this second separation step is (32±5) %. [ABSTRACT FROM AUTHOR]- Published
- 2018
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- View/download PDF
7. Online chemical adsorption studies of Hg, Tl, and Pb on SiO2and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA
- Author
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Lens, Lotte, Yakushev, Alexander, Düllmann, Christoph Emanuel, Asai, Masato, Ballof, Jochen, Block, Michael, David, Helena May, Despotopulos, John, Di Nitto, Antonio, Eberhardt, Klaus, Even, Julia, Götz, Michael, Götz, Stefan, Haba, Hiromitsu, Harkness-Brennan, Laura, Heßberger, Fritz Peter, Herzberg, Rodi D., Hoffmann, Jan, Hübner, Annett, Jäger, Egon, Judson, Daniel, Khuyagbaatar, Jadambaa, Kindler, Birgit, Komori, Yukiko, Konki, Joonas, Kratz, Jens Volker, Krier, Jörg, Kurz, Nikolaus, Laatiaoui, Mustapha, Lahiri, Susanta, Lommel, Bettina, Maiti, Moumita, Mistry, Andrew K., Mokry, Christoph, Moody, Ken, Nagame, Yuichiro, Omtvedt, Jon Petter, Papadakis, Philippos, Pershina, Valeria, Runke, Jörg, Schädel, Matthias, Scharrer, Paul, Sato, Tetsuya, Shaughnessy, Dawn, Schausten, Brigitta, Thörle-Pospiech, Petra, Trautmann, Norbert, Tsukada, Kazuaki, Uusitalo, Juha, Ward, Andrew, Wegrzecki, Maciej, Wiehl, Norbert, and Yakusheva, Vera
- Abstract
Online gas-solid adsorption studies with single-atom quantities of Hg, Tl, and Pb, the lighter homologs of the superheavy elements (SHE) copernicium (Cn, Z=112), nihonium (Nh, Z=113), and flerovium (Fl, Z=114), were carried out using short-lived radioisotopes. The interaction with Au and SiO2surfaces was studied and the overall chemical yield was determined. Suitable radioisotopes were produced in fusion-evaporation reactions, isolated in the gas-filled recoil separator TASCA, and flushed rapidly to an adjacent setup of two gas chromatography detector arrays covered with SiO2(first array) and Au (second array). While Tl and Pb adsorbed on the SiO2surface, Hg interacts only weakly and reached the Au-covered array. Our results contribute to elucidating the influence of relativistic effects on chemical properties of the heaviest elements by providing experimental data on these lighter homologs.
- Published
- 2018
- Full Text
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8. TASCAを用いたCn, Nh, Fl化学実験のためのHg, Tl, PbのSiO2及びAu表面に対するオンライン化学吸着研究
- Author
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Lotte Lens, Alexander Yakushev, Christoph Emanuel Düllmann, Masato Asai, Jochen Ballof, Michael Block, Helena May David, John Despotopulos, Antonio Di Nitto, Klaus Eberhardt, Julia Even, Michael Götz, Stefan Götz, Hiromitsu Haba, Laura Harkness-Brennan, Fritz Peter Heßberger, Rodi D. Herzberg, Jan Hoffmann, Annett Hübner, Egon Jäger, Daniel Judson, Jadambaa Khuyagbaatar, Birgit Kindler, Yukiko Komori, Joonas Konki, Jens Volker Kratz, Jörg Krier, Nikolaus Kurz, Mustapha Laatiaoui, Susanta Lahiri, Bettina Lommel, Moumita Maiti, Andrew K. Mistry, Christoph Mokry, Ken Moody, Yuichiro Nagame, Jon Petter Omtvedt, Philippos Papadakis, Valeria Pershina, Jörg Runke, Matthias Schädel, Paul Scharrer, Tetsuya Sato, Dawn Shaughnessy, Brigitta Schausten, Petra Thörle-Pospiech, Norbert Trautmann, Kazuaki Tsukada, Juha Uusitalo, Andrew Ward, Maciej Wegrzecki, Norbert Wiehl, Vera Yakusheva, Research unit Nuclear & Hadron Physics, Lens, Lotte, Yakushev, Alexander, Düllmann, Christoph Emanuel, Asai, Masato, Ballof, Jochen, Block, Michael, David, Helena May, Despotopulos, John, Di Nitto, Antonio, Eberhardt, Klau, Even, Julia, Götz, Michael, Götz, Stefan, Haba, Hiromitsu, Harkness-Brennan, Laura, Heßberger, Fritz Peter, Herzberg, Rodi D., Hoffmann, Jan, Hübner, Annett, Jäger, Egon, Judson, Daniel, Khuyagbaatar, Jadambaa, Kindler, Birgit, Komori, Yukiko, Konki, Joona, Kratz, Jens Volker, Krier, Jörg, Kurz, Nikolau, Laatiaoui, Mustapha, Lahiri, Susanta, Lommel, Bettina, Maiti, Moumita, Mistry, Andrew K., Mokry, Christoph, Moody, Ken, Nagame, Yuichiro, Omtvedt, Jon Petter, Papadakis, Philippo, Pershina, Valeria, Runke, Jörg, Schädel, Matthia, Scharrer, Paul, Sato, Tetsuya, Shaughnessy, Dawn, Schausten, Brigitta, Thörle-Pospiech, Petra, Trautmann, Norbert, Tsukada, Kazuaki, Uusitalo, Juha, Ward, Andrew, Wegrzecki, Maciej, Wiehl, Norbert, and Yakusheva, Vera
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Analytical chemistry ,chemistry.chemical_element ,Electronic structure ,010402 general chemistry ,01 natural sciences ,adsorption studie ,thermochromatography ,Homologs of superheavy element ,RELATIVISTIC PERIODIC DFT ,Metal ,GSI ,Adsorption ,CHEMISTRY ,0103 physical sciences ,isothermal chromatography ,Physical and Theoretical Chemistry ,SUPERHEAVY ELEMENTS ,010306 general physics ,Copernicium ,Chemistry ,QUARTZ SURFACE ,0104 chemical sciences ,gas phase chromatography of single atom ,HEAVIEST ELEMENTS ,Flerovium ,ELECTRONIC-STRUCTURE ,visual_art ,Yield (chemistry) ,METAL ,visual_art.visual_art_medium ,Gas chromatography ,Relativistic quantum chemistry ,physical preseparation ,SYSTEM - Abstract
Online gas-solid adsorption studies with single atom quantities of Hg, Tl, and Pb on SiO$_{2}$ and Au surfaces were carried out using short-lived radioisotopes with half-lives in the range of 4-49 s. This is a model study to measure adsorption enthalpies of superheavy elements Cn, Nh, and Fl. The short-lived isotopes were produced and separated by the gas-filled recoil separator TASCA at GSI. The products were stopped in He gas, and flushed into gas chromatography columns made of Si detectors whose surfaces were covered by SiO$_{2}$ or Au. The short-lived Tl and Pb were successfully measured by the Si detectors with the SiO$_{2}$ surface at room temperature. On the other hand, the Hg did not adsorb on the SiO$_{2}$ surface, but adsorbed on the Au surface. The results demonstrated that the adsorption properties of short-lived Hg, Tl, and Pb could be studied with this setup, and that this method is applicable to the experiment for Cn, Nh, and Fl., 半減期4$\sim$49秒の短寿命同位体を用いて、水銀(Hg), タリウム(Tl), 鉛(Pb)の単一原子レベルでのSiO$_{2}$及びAu表面への固体吸着挙動をオンライン気相実験により調べた。超重元素Cn, Nh, Flの吸着エンタルピー測定のためのモデル実験として実施した。短寿命同位体はドイツ重イオン研究所の反跳核分離装置TASCAを用いて生成・分離した。生成核はヘリウムガス中に捕集された後、SiO$_{2}$あるいはAuで表面を覆われたSi検出器で作製されたガスクロマトグラフィーカラムへと導入した。短寿命Tl及びPb同位体は室温においてSiO$_{2}$表面に吸着し、Si検出器で測定することに成功した。一方、HgはSiO$_{2}$表面には吸着せず、Au表面に吸着した。この結果より、本実験のセットアップを用いることで短寿命Hg, Tl, Pb同位体の吸着特性を調べることができると証明され、この手法がCn, Nh, Flの実験にも適用できることが確認された。
- Published
- 2018
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