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The Genesis Solar Wind Concentrator Target: Mass Fractionation Characterised by Neon Isotopes

Heber, V. ; Wiens, R. ; Reisenfeld, D. ; Allton, J. ; Baur, H. ; Burnett, D. ; Olinger, C. ; Wiechert, U. ; Wieler, R.

In: Space Science Reviews, 2007, vol. 130, no. 1-4, p. 309-316

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    Titre
    • The Genesis Solar Wind Concentrator Target: Mass Fractionation Characterised by Neon Isotopes
    Auteur
    • Heber, V.. Isotope Geology and Mineral Resources, ETH, 8092, Zürich, Switzerland
    • Wiens, R.. LANL, Space & Atmospheric Science, 87544, Los Alamos, NM, USA
    • Reisenfeld, D.. Physics and Astronomy, University of Montana, 59812, Missoula, MT, USA
    • Allton, J.. JSC, 2101 NASA Parkway, 77058, Houston, TX, USA
    • Baur, H.. Isotope Geology and Mineral Resources, ETH, 8092, Zürich, Switzerland
    • Burnett, D.. CalTech, JPL, 91109, Pasadena, CA, USA
    • Olinger, C.. LANL, Space & Atmospheric Science, 87544, Los Alamos, NM, USA
    • Wiechert, U.. AG Geochemie, FU Berlin, 12249, Berlin, Germany
    • Wieler, R.. Isotope Geology and Mineral Resources, ETH, 8092, Zürich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Space Science Reviews, 2007, vol. 130, no. 1-4, p. 309-316. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:314668
    Summary
    The concentrator on Genesis provided samples of increased fluences of solar wind ions for precise determination of the oxygen isotopic composition. The concentration process caused mass fractionation as a function of the radial target position. This fractionation was measured using Ne released by UV laser ablation and compared with modelled Ne data, obtained from ion-trajectory simulations. Measured data show that the concentrator performed as expected and indicate a radially symmetric concentration process. Measured concentration factors are up to ∼30 at the target centre. The total range of isotopic fractionation along the target radius is 3.8%/amu, with monotonically decreasing 20Ne/22Ne towards the centre, which differs from model predictions. We discuss potential reasons and propose future attempts to overcome these disagreements