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Mikael Elfman

Researcher

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Optimization of O-18 measurement using NRA for studies of isotopic content in fossil meteorites

Author

  • Maciek Borysiuk
  • Per Kristiansson
  • Natalia Arteaga
  • Mikael Elfman
  • Pavel Golubev
  • Erik Fors
  • C Nilsson
  • Jan Pallon
  • Naseem Salim

Summary, in English

In this work, we discuss the possibility of a new approach to measuring oxygen isotope ratios in fossil meteorite samples, specifically one based on nuclear reaction analysis (NRA). Variations of oxygen ratios within meteoritic chromite grains can help to determine the type of meteorite to which the grains originally belonged. In this work, we have evaluated the possibility to use the reaction O-18(p, alpha)N-15 just above the 846 keV resonance to estimate the relative oxygen-18 content in a number of test samples. Another technique has to be employed for oxygen-16 measurements. A large area segmented silicon detector is used to detect the produced alpha particles. Results of the experimental O-18 measurements for a number of samples including four extraterrestrial chromite grains are presented and compared with SIMNRA simulations. The advantage of a segmented silicon detector in the form of inherent pile-up suppression can be clearly seen in the current work. (C) 2011 Elsevier B.V. All rights reserved.

Department/s

  • Nuclear physics
  • Department of Physics

Publishing year

2011

Language

English

Pages

2229-2232

Publication/Series

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Volume

269

Issue

20

Document type

Conference paper

Publisher

Elsevier

Topic

  • Subatomic Physics

Keywords

  • Ion beam analysis
  • Nuclear microprobe
  • NRA
  • Semiconductor d

Conference name

12th International Conference on Nuclear Microprobe Technology and Applications (ICNMTA)

Conference date

2010-07-26 - 2010-07-30

Conference place

Leipzig, Germany

Status

Published

ISBN/ISSN/Other

  • ISSN: 0168-583X