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Elastic scattering cross section of 1H in H2O as a function of the neutron incident energy. The top plot (a) shows the neutron cross-section over the full energy range. The middle plot (b) highlights the discontinuity at the thermal cut-off energy (4.95 eV) between the thermal scattering law and the Free Gas Model when the thermodynamic temperature T is introduced in the Free Gas Model. The bottom plot (c) shows the continuous behaviour of the cross-section when T = Teff.
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