A comparison of the free vacancy production in ? brass by fission reactor neutrons and 14.8-MeV neutrons

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Abstract
Enhancement of substitutional diffusion is observed in a brass (30 wt% Zn) by following the decrease in electrical resistivity with neutron irradiation of a thermally equilibrated alloy; the decrease arises from the increase in short- range order. It was determined by previous research that this diffusion enhancement is largely caused by the annealing of radiation-produced vacancies in excess of the thermal equilibrium concentration. Therefore, the results reported here are based upon a well-established technique. The rate of resistivity change per neutron of different energies will give the average relative number of free vacancies produced per neutron. This experiment compares the effect of 14.8-MeV neutrons with neutrons from a fission reactor. The results indicate that 14.8-MeV neutrons produce 10 + 2 times as many free vacancies as reactor neutrons when the latter are expressed in terms of those neutrons with energies greater than 0.1 MeV.

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