Accelerator mass spectrometry of 59Ni in extraterrestrial matter

Details Accelerator mass spectrometry of 59Ni in extraterrestrial matter Accelerator mass spectrometry of 59Ni in extraterrestrial matter

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993nimpb..73..403k&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 73, Issue 3, p. 403-412.

Physics

11

Scientific paper

Cosmic-ray produced 59Ni (t1/2 = 76000 years) was detected in meteoritic and lunar material by AMS with fully stripped ions. At 641 MeV beam energy, a clean separation of 59Ni28+ ions from 59Co27+ background was achieved with a magnetic spectrograph. A background limit of 59Ni/Ni < 7 × 10-14 was determined with a blank Ni sample. A 59Ni/Ni ratio of (2.3 +/- 0.4) × 10-11 was measured in a sample from the Admire stony-iron (pallasite) meteorite, corresponding to a specific activity of 280+/-50dpm/kg meteorite. In a surface layer of Apollo 16 lunar rock 68815, a 59Ni/Ni ratio of (8.8 +/- 3.3) × 10-13 was measured (diluted with Ni carrier), corresponding to a specific activity of 4.1 +/- 1.5 dpm/kg rock. This result compares well with values calculated by Reedy from the 56Fe(α, n)59Ni reaction induced by solar cosmic ray alpha particles. Methodological aspects of the full-stripping technique and future possibilities of 59Ni measurements in lunar materials are discussed.

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