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  2. Neutron reflector - Wikipedia

    en.wikipedia.org/wiki/Neutron_reflector

    The decrease in the critical size of core required is known as the reflector savings. Neutron reflectors reduce neutron leakage, i.e., to reduce the neutron fluence on a reactor pressure vessel. Neutron reflectors reduce a coolant flow bypass of a core. Neutron reflectors serve as a thermal and radiation shield of a reactor core.

  3. Critical mass - Wikipedia

    en.wikipedia.org/wiki/Critical_mass

    The critical mass can be greatly reduced by the use of a tamper. The following table lists the values for common neutron reflectors, where λ tamp is the mean free path of a neutron within the tamper material before an elastic scattering. In nuclear weapon design, natural uranium is primarily used.

  4. Neutron supermirror - Wikipedia

    en.wikipedia.org/wiki/Neutron_supermirror

    A neutron supermirror is a highly polished, layered material used to reflect neutron beams. Supermirrors are a special case of multi-layer neutron reflectors with varying layer thicknesses. [1] The first neutron supermirror concept was proposed by Ferenc Mezei, [2] inspired by earlier work with X-rays.

  5. Neutron moderator - Wikipedia

    en.wikipedia.org/wiki/Neutron_moderator

    Moderation is the process of the reduction of the initial high speed (high kinetic energy) of the free neutron. Since energy is conserved, this reduction of the neutron speed takes place by transfer of energy to a material called a moderator. The probability of scattering of a neutron from a nucleus is given by the scattering cross section. The ...

  6. Neutron - Wikipedia

    en.wikipedia.org/wiki/Neutron

    Cold, thermal, and hot neutron radiation is commonly employed in neutron scattering facilities for neutron diffraction, small-angle neutron scattering, and neutron reflectometry. Slow neutron matter waves exhibit properties similar to geometrical and wave optics of light, including reflection, refraction, diffraction, and interference. [ 123 ]

  7. Neutron reflectometry - Wikipedia

    en.wikipedia.org/wiki/Neutron_reflectometry

    The reflection is usually described in terms of a momentum transfer vector, denoted , which describes the change in momentum of a neutron after reflecting from the material. Conventionally the z {\displaystyle z} direction is defined to be the direction normal to the surface, and for specular reflection, the scattering vector has only a z ...

  8. Tamper (nuclear weapon) - Wikipedia

    en.wikipedia.org/wiki/Tamper_(nuclear_weapon)

    It is used in nuclear weapon design to reduce the critical mass and to delay the expansion of the reacting material through its inertia, which delays the thermal expansion of the fissioning fuel mass, keeping it supercritical longer. Often the same layer serves both as tamper and as neutron reflector. The weapon disintegrates as the reaction ...

  9. Ultracold neutrons - Wikipedia

    en.wikipedia.org/wiki/Ultracold_neutrons

    The reflection is caused by the coherent strong interaction of the neutron with atomic nuclei. It can be quantum-mechanically described by an effective potential which is commonly referred to as the Fermi pseudo potential or the neutron optical potential. The corresponding velocity is called the critical velocity of a material. Neutrons are ...