Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS

<table>Characteristic function <svg height="13.625" id="M63" style="vertical-align:-2.21957pt" version="1.1" viewbox="0 0 32.575001 13.625" width="32.575001" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,13.625)">
<g transform="translate(72,-61.1)">
<text transform="matrix(1,0,0,-1,-71.95,63.36)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝒩</tspan>
<tspan style="font-size: 12.50px; " x="12.12791" y="0">(</tspan>
<tspan style="font-size: 12.50px; " x="16.291409" y="0">𝑠</tspan>
<tspan style="font-size: 12.50px; " x="21.792728" y="0">)</tspan>
</text>
</g>
</g>
</svg>. The right-hand figure shows the two largest roots of the equation.</table>

Science and Technology of Nuclear Installations

fig2

Figure 2

Figure 2: Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS 