A new half-life determination of Ni-59

Details A new half-life determination of Ni-59 A new half-life determination of Ni-59

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..227r&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 3, p. 227-230

Physics

3

Half Life, Neutron Cross Sections, Nickel Isotopes, Iron Isotopes, Mass Spectroscopy, Meteorites, Purification, Silicon Radiation Detectors, Thermal Neutrons, X Ray Spectra

Scientific paper

An enriched Ni-58 sample has been irradiated with thermal neutrons together with an enriched Fe-54 target. After chemical purification of the nickel sample, the produced radioactivities of Ni-59 and Fe-55 were measured with a silicon detector. The half-life of Ni-59 has been deduced to be 108,000 +/- 13,000 years. This half-life is larger than the commonly adopted half-life value of 76,000 +/- 5000 years but is in full agreement with Ni-59 concentration and activity measurements of the meteorite Admire. With accelerator mass spectrometry, the cross-section of the reaction (60)Ni(n,2n)(59)Ni for 14.8 MeV neutrons has been measured to be 410 +/- 100 mb.

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