Contribution of neutron-capture reactions to observed tungsten isotopic ratios

Details Contribution of neutron-capture reactions to observed tungsten isotopic ratios Contribution of neutron-capture reactions to observed tungsten isotopic ratios

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.152..181m&link_type=abstract

Earth and Planetary Science Letters, Volume 152, Issue 1-4, p. 181-185.

Physics

22

Scientific paper

To study whether tungsten isotopic ratios observed in terrestrial samples relative to W ratios in an iron meteorite could be made by neutron-capture reactions in the iron meteorite, the fluxes of thermal and epithermal neutrons in a large iron meteoroid, Toluca, were calculated using Monte Carlo particle production and transport codes. Peak neutron-capture rates on W isotopes were calculated to occur at depths of 30-34 cm. The calculated changes in the 182W/183W due to neutrons are much less than those observed in terrestrial samples relative to iron meteorites, indicating a non-cosmogenic origin of the observed W isotopic ratios.

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