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  2. Atomic form factor - Wikipedia

    en.wikipedia.org/wiki/Atomic_form_factor

    The atomic form factor depends on the type of scattering, which in turn depends on the nature of the incident radiation, typically X-ray, electron or neutron. The common feature of all form factors is that they involve a Fourier transform of a spatial density distribution of the scattering object from real space to momentum space (also known as ...

  3. Structure factor - Wikipedia

    en.wikipedia.org/wiki/Structure_factor

    The structure factor is a critical tool in the interpretation of scattering patterns (interference patterns) obtained in X-ray, electron and neutron diffraction experiments. Confusingly, there are two different mathematical expressions in use, both called 'structure factor'.

  4. Neutron scattering - Wikipedia

    en.wikipedia.org/wiki/Neutron_scattering

    Results are generally communicated as the dynamic structure factor (also called inelastic scattering law) (,), sometimes also as the dynamic susceptibility ′ ′ (,) where the scattering vector is the difference between incoming and outgoing wave vector, and is the energy change experienced by the sample (negative that of the scattered neutron).

  5. Six factor formula - Wikipedia

    en.wikipedia.org/wiki/Six_factor_formula

    The multiplication factor, k, is defined as (see nuclear chain reaction): k = ⁠ number of neutrons in one generation / number of neutrons in preceding generation ⁠. If k is greater than 1, the chain reaction is supercritical, and the neutron population will grow exponentially.

  6. Dynamic structure factor - Wikipedia

    en.wikipedia.org/wiki/Dynamic_structure_factor

    Here (,), is called the intermediate scattering function and can be measured by neutron spin echo spectroscopy. The intermediate scattering function is the spatial Fourier transform of the van Hove function G ( r → , t ) {\displaystyle G({\vec {r}},t)} : [ 2 ] [ 3 ]

  7. List of equations in nuclear and particle physics - Wikipedia

    en.wikipedia.org/wiki/List_of_equations_in...

    Quantity (common name/s) (Common) symbol/s Defining equation SI units Dimension Number of atoms N = Number of atoms remaining at time t. N 0 = Initial number of atoms at time t = 0

  8. Four factor formula - Wikipedia

    en.wikipedia.org/wiki/Four_factor_formula

    The four-factor formula, ... is the average lethargy gain per scattering event. Lethargy is defined as decrease in neutron energy. ... is the probability that a fast ...

  9. Debye–Waller factor - Wikipedia

    en.wikipedia.org/wiki/Debye–Waller_factor

    The Debye–Waller factor (DWF), named after Peter Debye and Ivar Waller, is used in condensed matter physics to describe the attenuation of x-ray scattering or coherent neutron scattering caused by thermal motion. [1] [2] It is also called the B factor, atomic B factor, or temperature factor.