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Paul Scherrer Institut

Patrick Steinegger. Paul Scherrer Institut. Diamond Detectors for Transactinide Chemistry. PSI,. 8. September 2014. Outline. Introduction to transactinide chemistry The COLD thermochromatography setup and resulting deposition pattern

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Paul Scherrer Institut

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  1. Patrick Steinegger Paul Scherrer Institut Diamond Detectors for Transactinide Chemistry PSI, PSI, 8. September 2014

  2. Outline Introduction to transactinide chemistry The COLD thermochromatography setup and resulting deposition pattern Problems with common Si PIN-diodes and possible application of diamond detectors First trials using diamond detectors Seite 2 PSI, 8. September 2014

  3. Transactinide Chemistry Experiments We are interested in the chemical properties of transactinide elements ( Z > 103 ) with a special focus on the so-called superheavy elements ( SHE ). For instance, this is achieved by deducing adsorption enthalpies (-DHads) using the thermochormatography setup with the Cryo – OnLine – Detector ( COLD ). T = 35 °C T = -180°C Detector array I. Zvara, Isotopenpraxis26 ( 1990 ) 6, pp. 251 – 258 Seite 3 PSI, 8. September 2014

  4. Schematic Experimental Setup Decay properties of SHE 114 (observed at FLNR in 2004 [1] ) Hg (a) Rn (a) [2] [1] Y. Oganessian et al., Phys. Rev. C70 ( 2004 ) [2] R. Eichler et al., Nature447 ( 2007 ), pp. 72 – 75 PSI, PSI, 8. September 2014

  5. The COLD Detector Array Seite 5 PSI, 8. September 2014

  6. Deposition of 185Hg and 219Rn along COLD • Higher temperatures would enable the determination of adsorption enthalpies of elements with even higher adsorption characteristics on gold ( e.g. 113, Tl, Hg, Pb, etc. → e.g. 10 diamond sandwitch detectors in the COLD array for the „hot region“). Monte Carlo Simulation Temperature limitation at Tmax ≈ 40 °C PSI, PSI, 8. September 2014

  7. (-28°C) (-5°C) (-21°C) (-39°C) (-124°C) Deposition of Element Cn ( 112 ) PSI, PSI, 8. September 2014

  8. Further Diamond Detector Applications Since diamond detectors can be operated near a hot source (e.g. oven), they are perfectly suitable for isothermal vacuumchormatography experiments: Diamond Detector (cooled catcher) Heat source (e.g. resistance oven) Read-out Electron. • The transition from gas chromatography towards vacuum chromatography (either isothermal or thermal) has the following advantages: • No aerosol transport and therefore lower background (decreased random rate) • Less pollutions (organic impurities, water, etc.) → clean stationary surfaces • Better energy resolution in case of vacuum thermochromatography • Less chromatographic resolution due to random walk • The possibility of positioning the detector near an IR, UV or VIS source or the operation in the vicinity of an oven is another important feature for other experiments (thermal release expperiments → T ≈ 1200 °C). Seite 8 PSI, 8. September 2014

  9. Isothermal Vacuumchromatography Seite 9 PSI, 8. September 2014

  10. Further Diamond Detector Applications • Another option are online studies of electrochemically spontanous deposition of superheavy elements on metallized detector surfaces. So far, applied Si detector material was usually damaged due to electrode surface „pinholes“. Seite 10 PSI, 8. September 2014

  11. First Trials with CVD / B-doped Diamond Diamond “glued” and wire-bonded onto ceramic carrier DBS Microwave SA 3-line source ( 239Pu, 241Am, 244Cm ) PSI, PSI, 8. September 2014

  12. First Trials with Element6 scCVD Diamond So far it has not yet been possible to record a spectrum. We use(d) different setups - among them the one applied by Pomorski et al. [1] and again another with the diamond glued on a ceramic carrier. 10 nm Cr / 100 nm Au ( both sides) Voltage connections Swan Research Glued diamond Wire bonding Ceramic carrier Signal out [1] M. Pomorski, Phys. Stat. Sol. (a)203 ( 2006 ) 12, pp. 3152 – 3160 Seite 12 PSI, 8. September 2014

  13. Thank you for your kind attention! PSI, PSI, 8. September 2014

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