Resonance Scattering of Slow Neutrons on Indium
1958; American Institute of Physics; Volume: 109; Issue: 2 Linguagem: Inglês
10.1103/physrev.109.417
ISSN1536-6065
Autores Tópico(s)Nuclear Physics and Applications
ResumoThe scattering of slow neutrons by indium was observed by using a crystal spectrometer as a monoenergetic neutron source. Thin scattering samples were placed in the neutron beam with the plane of the samples at a small angle to the incident beam. The samples therefore appeared thick for the transmitted neutrons but thin for neutrons scattered at right angles to the direction of the incident beam. A measurement of the scattered and the transmitted neutrons gives $\frac{{\ensuremath{\sigma}}_{s}}{{\ensuremath{\sigma}}_{t}}$. The total cross section ${\ensuremath{\sigma}}_{t}$ was also measured in the energy range from 0.3 to 11 ev and the value of ${\ensuremath{\sigma}}_{s}$ then computed. Both the total cross section and $\frac{{\ensuremath{\sigma}}_{s}}{{\ensuremath{\sigma}}_{t}}$ results could be well matched to the Breit-Wigner formulas from 0.3 to 3 ev with the same set of parameters, assuming that the spin of the compound state in ${\mathrm{In}}^{116}$ for the 1.456-ev level was 5. No determination of the spin state of the compound nucleus could be made for higher levels.
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