Use of the 9Be(α, n)12C reaction for detection of beryllium

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Abstract

A strong, sharp resonance in the cross section of the 9Be(α, n)12C reaction gives the possibility of profiling beryllium. The resonance occurs near 620 keV, an energy around the maximum of the stopping power of the α-particles in beryllium. The excitation function of the reaction was measured with a 4 π neutron detector using thin Be films on Ta in the energy range of 480–740 keV. The peak value of the cross section is about 0.21 mb and its width is less than 6 keV. Particular interest is in the possibility of characterizing 9Be layer on the plasma facing surfaces of tokamak materials.

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