Abstract
We determined the coherent neutron scattering length of gaseous natural krypton and 86Kr using neutron interferometry. Measurements were performed at a 250 kW TRIGA reactor. The result for 86Kr, b c = 8.07(26) fm is new; the result for nKr is in excellent agreement with literature. The accuracy of the results is restricted by the stability of the setup and not by the limited neutron flux. The results obtained at the small reactor prove that neutron interferometry is feasible even at small neutron sources, provided that a stable setup is used.
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