i need a help in solving ,using 1 group approxmation , estimate the critical size of cube consisting of 75% zirconium-91 and 25% plutonium--239 by volume , when the cube is surrounded by a vacumm.(adsbygoogle = window.adsbygoogle || []).push({});

zr-91

microscopic cross section (capture)=0.00335

microscopic cross section (scattering )=5.89

density=6.4 g/cm3

Mass=90.9056 g/mol

pu-239

v=2.98 n/fission

microscopic cross section (fission)=1.81

microscopic cross section (capture)=0.05

microscopic cross section (scattering )=7.42

density=19 g/cm3

Mass=239.0522 g/mol

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# One group neutron diffusion calculation

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