Fe54(n,p), (n,α), (n,2n) Cross Sections

Details Fe54(n,p), (n,α), (n,2n) Cross Sections Fe54(n,p), (n,α), (n,2n) Cross Sections

Oct 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965phrv..140..305s&link_type=abstract

Physical Review, vol. 140, Issue 2B, pp. 305-310

Physics

3

Scientific paper

Absolute cross sections for the Fe54(n,p)Mn54, and Fe54(n,α)Cr51 reactions have been measured for the neutron energy intervals 2.2 to 6.2 MeV and 13.1 to 16.8 MeV. The cross section for the Fe54(n,2n)Fe53 reaction has been measured at 14.0 and 16.8 MeV. Ten samples 1 by 2 by 0.45 cm enriched to 97% in Fe54 were irradiated. Neutrons were produced with the D(d,n) and T(d,n) reactions, using gas targets and a Van de Graaff accelerator. Samples were placed 9 cm from the gas cell at angles from 0° to 122°. The absolute neutron flux at 11° was measured with a proton-recoil telescope. Relative neutron angular distributions were obtained from published D(d,n) and T(d,n) cross sections by integrating over source and target dimensions; the effect of scattering in the gas-cell window foil was also included. These angular distributions were normalized to the telescope values. The induced gamma activity following the decay of Mn54, Cr51, and Fe53 was counted with a large calibrated NaI scintillation spectrometer. The (n,p), (n,α), and (n,2n) results at 14 MeV agree with previous experimental work. Previous measurements of the (n,p) cross section from 2 to 6 MeV give values somewhat lower than the present work. All experimental results are somewhat higher than cross sections obtained by a statistical-model calculation based on optical-model potentials, while a more empirical calculation gives good agreement with the (n,2n) data.

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