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 Mass of the offices of the papal court previously required for the celebration of the papal Mass. Soon after his coronation, Paul VI ceased using the papal tiara. He discontinued the use of many traditional features of papal dress, including the papal slippers and pontifical gloves. However, he did carry a distinctive form of papal ferula, silver in colour, which Pope John Paul II also used. Pope Benedict XVI carried a golden ferula with a central image of the Lamb of God and without a figure of Christ crucified. On certain occasions, Pope John Paul II, and Benedict XVI wore the