Diffusion area from diffusion coefficient and absorption cross section
======================================================================

Diffusion area of a nuclear reaction can be found as the ratio of he diffusion
coefficient to the macroscopic absorption cross section of the reaction.

**Links:**

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

.. py:currentmodule:: symplyphysics.laws.nuclear.diffusion_area_from_diffusion_coefficient

.. py:data:: diffusion_coefficient

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

Symbol:
    :code:`D`

Latex:
    :math:`D`

Dimension:
    :code:`length`


.. py:data:: macroscopic_absorption_cross_section

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

Symbol:
    :code:`Sigma_a`

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

Dimension:
    :code:`1/length`


.. py:data:: diffusion_area

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

Symbol:
    :code:`L^2`

Latex:
    :math:`L^{2}`

Dimension:
    :code:`area`


.. py:data:: law

    :code:`L^2 = D / Sigma_a`


    Latex:
        .. math::
            L^{2} = \frac{D}{\Sigma_\text{a}}