Abstract
The resonance activation integral of 55Mn was measured relatively to that of 197Au by absolute counting on 56Mn and 198Au: 56Mn was measured with a Ge(Li) counter whose detecting efficiency for γ-rays had been previously determined by a set of IAEA calibrated γ-sources, while 198Au was measured with a 4πβ-γ coincidence counter. The neutron spectrum was deter-mined by P1 calculation and was verified by time-of-fiight method.The ratio Il/υ/Ires was obtained experimentallymaking use of boron filters of three different thicknesses.The results were Itotal=14.1±0.6 barn and Il/υ/Ires=0.57±0.06, for a cutoff energy of 0.63 eV.
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