Cross-section of $^{10}$B monotonically decreases with neutron energy. But it does not have any resonance absorption peaks unlike in the cross-sections of $^{239}$Pu and $^{238}$U. Why?
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$\begingroup$ There certainly is structure starting at around 0.5MeV. The 10B(n,g)11B cross section is pretty smooth. Have you looked at the data on ENDF? $\endgroup$– Jon CusterCommented Aug 4, 2021 at 19:17
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$\begingroup$ The isobar diagrams at nucldata.tunl.duke.edu are also useful. $\endgroup$– Jon CusterCommented Aug 4, 2021 at 19:21
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1 Answer
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The fission of $^{10}B$
$^{10}\mathrm{B} + ^{1}\mathrm{n} \longrightarrow ^7\mathrm{Li} + ^4\mathrm{He} + \text{2.8 MeV} $
implies that there should be resonance somewhere for the reaction to occur.
