In-situ measurement of the rate of 235U fission induced by lunar neutrons

Details In-situ measurement of the rate of 235U fission induced by lunar neutrons In-situ measurement of the rate of 235U fission induced by lunar neutrons

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..21..153w&link_type=abstract

Earth and Planetary Science Letters, Volume 21, Issue 2, p. 153-163.

Computer Science

7

Scientific paper

The depth profile of the neutron-induced fission rate of 235U was directly measured to a depth of 350 g/cm2 by the Apollo 17 Lunar Neutron Probe Experiment. The fission rate rises sharply from the surface to a broad maximum from 110 to 160 g/cm2 and drops off at greater depths. The shape of theoretical depth profile of Lingenfelter et al. fits the measured capture rates well at all depths. The absolute magnitude of the experimental fission rates are (11+/-17)% lower than those calculated theoretically. The excellent agreement between theory and experiment implies that conclusions drawn previously by interpreting lunar sample data with the theoretical capture rates will not require revision. In particular lunar surface processes, rather than uncertainties in the capture rates, are required to explain the relatively low neutron fluences observed for surface soil samples compared to the fluences expected for a uniformly mixed regolith.

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