Barites - Anomalous xenon from spallation and neutron-induced reactions

Details Barites - Anomalous xenon from spallation and neutron-induced reactions Barites - Anomalous xenon from spallation and neutron-induced reactions

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..129s&link_type=abstract

Earth and Planetary Science Letters, vol. 31, no. 1, June 1976, p. 129-141.

Computer Science

4

Barite, Sedimentary Rocks, Spallation, Xenon Isotopes, Abundance, Isotope Effect, Mass Ratios, Neutron Activation Analysis, Nuclear Reactions

Scientific paper

Sedimentary barites from South Africa and Western Australia (about 3 billion years old) contain spallogenic Xe isotopes produced by reactions of Ba with nuclear-active particles in cosmic rays. 'Surface residence time' of these samples was calculated from the observed concentrations of spallogenic Xe-126. Comparison of spallogenic ratios of Xe-131/Xe-126 in the two samples provides evidence for the reaction Ba-130(n, gamma) yields Xe-131, which is characterized by a large number of resonances for neutron absorption in the epithermal region. This observation lends additional support to the conclusions already reached regarding the origin of anomalous Xe-131 in lunar samples.

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