Abstract
The measurement of the total neutron cross-section of sodium in the region 600 eV to 15 keV using the Harwell 15 MeV linear electron accelerator is described. Analysis of the results in conjunction with the known values of the low energy elastic and radiative capture cross-sections leads to the following conclusions. The cross-section up to 15 keV may be described in terms of a potential scattering cross-section of 2.4 barn and two s-wave resonances, one at 2.85±0.04 keV neutron energy and the other at negative energy. The 2.85 keV resonance has parameters σ 0 = 370±5 barn, Γ n = 405±12 eV, Γ γ ≦ 0.34±0.01 eV and spin J = 1+. The negative energy resonance has a ratio of reduced width to resonance energy of γ n 2/ E R = −0.5 while | E R| ⪢1 keV. The spin of this resonance is J = 2+.
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