Measurement of Resonance Activation Integral of ⁵⁵Mn

抄録

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 I_l/υ/I_res was obtained experimentallymaking use of boron filters of three different thicknesses.
The results were I_total=14.1±0.6 barn and I_l/υ/I_res=0.57±0.06,
for a cutoff energy of 0.63 eV.