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- W2019992103 abstract "Cosmic-ray produced 59Ni (t12 = 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." @default.
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- W2019992103 title "Accelerator mass spectrometry of 59Ni in extraterrestrial matter" @default.
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