Wechselwirkung von Neutronen mit Wolfram und seinen Isotopen

The coherent neutron scattering lengths and total cross sections of elemental and oxide samples of natural and isotopically enriched W are determined. From these results the following coherent scattering lengths, b, and absorptions at 0.0253 eV, σγ were deduced:b (natW) = 4.86±0.02 fm, σγ = 17.3 ±0.5 b ,b (182W) = 7.04±0.04 fm, σγ = 19.6±0.3 b ,b (183W) = 6.59±0.04 fm, σγ = 10.5±0.2 b ,b (184W) = 7.55±0.06 fm, σγ = 1.7±0.1 b ,b (186W) = -0 .7 3±0.04 fm, σγ = 38.5 ±0.8 b .By comparison with the resonance parameters, the incoherence and the potential radii are derived and discussed. The bound level on W-182 must be fitted with a scattering width of gI0n = 161 meV at E0 = - 94 eV.