Diffusion coefficient from macroscopic scattering cross section
===============================================================

Neutron diffusion coefficient can be found from the macroscopic scattering cross
section.

**Links:**

#. `NuclearPower <https://www.nuclear-power.com/nuclear-power/reactor-physics/neutron-diffusion-theory/diffusion-coefficient/>`__.

.. py:currentmodule:: symplyphysics.laws.nuclear.neutron_diffusion_coefficient_from_scattering_cross_section

.. py:data:: macroscopic_transport_cross_section

    :attr:`~symplyphysics.symbols.nuclear.macroscopic_cross_section` of transport.

Symbol:
    :code:`Sigma_tr`

Latex:
    :math:`\Sigma_\text{tr}`

Dimension:
    :code:`1/length`


.. py:data:: diffusion_coefficient

    :attr:`~symplyphysics.symbols.nuclear.neutron_diffusion_coefficient`.

Symbol:
    :code:`D`

Latex:
    :math:`D`

Dimension:
    :code:`length`


.. py:data:: law

    :code:`D = 1 / (3 * Sigma_tr)`


    Latex:
        .. math::
            D = \frac{1}{3 \Sigma_\text{tr}}