Stable platinum isotope measurements in presolar nanodiamonds by TEAMS

A. Wallner, K. Melber, S. Merchel, U. Ott, O. Forstner, R. Golser, W. Kutschera, A. Priller, P. Steier

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Abstract

Nanodiamonds are stardust grains commonly found in primitive meteorites. They survived the formation of the solar system and kept their own individuality. Measurements of trace-element isotopic signatures in these grains will help understanding heavy element nucleosynthesis in massive stars and dust formation from their ejecta. We have continued previous attempts to search for stable Pt isotope anomalies in nanodiamonds via trace element accelerator mass spectrometry (TEAMS). The installation of a new injector beam line at the VERA facility allowed studying low traces of stable elements in different materials. Moreover, recent experiments showed that VERA provides the required measurement precision together with a low Pt machine background. Here, we observed for the first time an indication for enhancements of 198Pt/195Pt isotope ratios in two diamond residues prepared by different chemical separation techniques from the Allende meteorite. Variations in other isotopic ratios were within analytical uncertainty, and no anomaly was identified in a third diamond fraction.

Original languageEnglish
Pages (from-to)496-502
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume294
DOIs
Publication statusPublished - Jan 1 2013

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Keywords

  • Nanodiamonds
  • Presolar grains
  • Pt
  • Super novae
  • TEAMS
  • Trace elements

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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