Abstract
A spherical shell transmission experiment with 14 MeV neutrons on beryllium is reported. By employing various spectroscopic methods with absolute detector calibration together with a measurement of the neutron source strength, both the leakage neutron spectrum over its complete energy range and the neutron multiplication factor are obtained. The work is in progress. Preliminary results for a beryllium shell of 17 cm thickness are reported. Neutron leakage multiplications are obtained for several energy windows. A tentative conclusion is that the higher Be(n, 2n) cross section of the 1979 Los Alamos evaluation fits the data better than the lower one of ENDF/B-VI does.
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