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<p>are transparent to neutrons and allow deeper penetration. The interaction between neutrons and nuclei is described by the <a href="page.php?w=Fermi_pseudopotential">Fermi pseudopotential</a>, that is, neutrons are well above their <a href="page.php?w=meson">meson</a> mass threshold, and thus can be treated effectively as point-like <a href="page.php?w=scatterer">scatterer</a>s. While most elements have a low tendency to absorb neutrons, certain ones such as <a href="page.php?w=cadmium">cadmium</a> (Cd), <a href="page.php?w=gadolinium">gadolinium</a></p><p>
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