Neutron cross section according to its neutron cross section and how it reacts to an incident neutron. Nuclides that tend to absorb a neutron and either decay or keep the neutron in its nucleus are neutron absorbers and will have a "capture cross section" for that reaction. Isotopes that fission, are fissionable fuels and have a corresponding "fission cross section". The remaining isotopes will simply scatter the neutron, and have a "scatter cross section". Some isotopes, like uranium-238, have nonzero cross sections of all three. Isotopes which have a large scatter cross section and a low mass are good neutron moderators (see chart
Papal regalia and insignia the traditional red Papal shoes, but Pope Francis has reverted to black shoes. The pope's ordinary dress (also called house dress), which is worn for daily use outside of liturgical functions, consists of a white cassock with attached pellegrina and girded with a fringed white fascia (often with the papal coat of arms embroidered on it), a pectoral cross suspended from a gold cord, red papal shoes, and a white zucchetto. On more formal occasions, the pope may wear a red cape similar to the ferraiuolo except for its gold decoration. Alternatively, he may wear a red cape with a