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 shoes Papal shoes The Papal shoes were the red leather outdoor shoes worn by the Pope. They should not be confused with the indoor Papal Slippers or the Episcopal sandals, which are the liturgical footwear proper to all ordained Catholic bishops of the Latin Rite. As did many noblemen, the Pope wore slippers ("pantofole") inside his residences and leather shoes outside. The indoor Papal Slippers were made of red velvet or silk and were heavily decorated in gold braid, with a gold cross in the middle. Throughout Church history, the color red has been deliberately chosen to represent the blood of