Draw and explain the energy variation of fission cross-sections for and
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The fission cross-section, ( \sigma_f ), represents the probability of a nucleus undergoing fission when struck by a neutron. Its variation with neutron energy depends on whether the nucleus is fissile or fertile and on resonance effects. For ( ^{238}*{92}\mathrm{U} ) and ( ^{232}*{90}\mathrm{Th} ), both are fertile nuclei, meaning they are not readily fissile with thermal (slow) neutrons but can undergo fission with ___ _________ ___ _____ ______ ___ __________ ___ ____ ______ ____ _____.
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