Effect of temperature on total cross section of beryllium for thermal neutrons

The total cross section of beryllium in the 0.002--0.3 eV neutron energy range was measured by transmission technique at four different temperatures of the sample - 3000, 5730, 7730 and 9730K. The scattering kernel was directly calculated from the frequency distribution function, instead of using S(α, β) as practiced in the GASKET-FLANGE method. Integration of the scattering kernel based on the Sinclair model, the Young-Koppel model and the Raubenheimer-Gilat model resulted in little difference between the calculated total cross sections obtained with the three models. The experimental values are in good agreement with calculations for all measured temperatures of the sample. (auth.)