Abstract
The thermal neutron scattering of argon is unusual in that it shows a large amount of incoherent scattering, even though it is even-even practically monoisotopic. The incoherence has been ascribed by Henshaw to a large scattering cross section for ${\mathrm{Ar}}^{36}$. Measurements with the BNL fast chopper for a gas sample enriched to 63% ${\mathrm{Ar}}^{36}$ have shown that the total cross section from 0.1 ev to 6 kev varies in such a way as to reveal the presence of a negative energy level. The parameters ${{\ensuremath{\Gamma}}_{n}}^{0}=82$ ev, ${E}_{0}=\ensuremath{-}9.8$ kev, and ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}}=1.85$ ev have been deduced for this level. The consequences of this anomalous scattering for neutron studies of atomic motions in a liquid are discussed.
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