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Co-authored-by: Paul Romano <paul.k.romano@gmail.com> Co-authored-by: April Novak <novak@berkeley.edu>
131 lines
3.5 KiB
ReStructuredText
131 lines
3.5 KiB
ReStructuredText
.. _io_depletion_chain:
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============================
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Depletion Chain -- chain.xml
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============================
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A depletion chain file has a ``<depletion_chain>`` root element with one or more
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``<nuclide>`` child elements. The decay, reaction, and fission product data for
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each nuclide appears as child elements of ``<nuclide>``.
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---------------------
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``<nuclide>`` Element
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---------------------
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The ``<nuclide>`` element contains information on the decay modes, reactions,
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and fission product yields for a given nuclide in the depletion chain. This
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element may have the following attributes:
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:name:
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Name of the nuclide
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:half_life:
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Half-life of the nuclide in [s]
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:decay_modes:
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Number of decay modes present
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:decay_energy:
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Decay energy released in [eV]
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:reactions:
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Number of reactions present
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For each decay mode, a :ref:`io_chain_decay` appears as a child of
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``<nuclide>``. For each reaction present, a :ref:`io_chain_reaction` appears as
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a child of ``<nuclide>``. If the nuclide is fissionable, a :ref:`io_chain_nfy`
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appears as well.
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.. _io_chain_decay:
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-------------------
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``<decay>`` Element
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-------------------
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The ``<decay>`` element represents a single decay mode and has the following
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attributes:
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:type:
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The type of the decay, e.g. 'ec/beta+'
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:target:
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The daughter nuclide produced from the decay
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:branching_ratio:
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The branching ratio for this decay mode
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.. _io_chain_reaction:
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--------------------
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``<source>`` Element
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--------------------
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The ``<source>`` element represents photon and electron sources associated with
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the decay of a nuclide and contains information to construct an
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:class:`openmc.stats.Univariate` object that represents this emission as an
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energy distribution. This element has the following attributes:
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:type:
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The type of :class:`openmc.stats.Univariate` source term.
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:particle:
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The type of particle emitted, e.g., 'photon' or 'electron'
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:parameters:
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The parameters of the source term, e.g., for a
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:class:`openmc.stats.Discrete` source, the energies (in [eV]) at which the
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particles are emitted and their relative intensities in [Bq/atom] (in other
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words, decay constants).
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----------------------
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``<reaction>`` Element
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----------------------
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The ``<reaction>`` element represents a single transmutation reaction. This
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element has the following attributes:
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:type:
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The type of the reaction, e.g., '(n,gamma)'
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:Q:
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The Q value of the reaction in [eV]
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:target:
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The nuclide produced in the reaction (absent if the type is 'fission')
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:branching_ratio:
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The branching ratio for the reaction
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.. _io_chain_nfy:
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------------------------------------
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``<neutron_fission_yields>`` Element
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------------------------------------
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The ``<neutron_fission_yields>`` element provides yields of fission products for
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fissionable nuclides. Normally, it has the follow sub-elements:
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:energies:
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Energies in [eV] at which yields for products are tabulated
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:fission_yields:
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Fission product yields for a single energy point. This element itself has a
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number of attributes/sub-elements:
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:energy:
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Energy in [eV] at which yields are tabulated
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:products:
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Names of fission products
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:data:
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Independent yields for each fission product
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In the event that a nuclide doesn't have any known fission product yields, it is
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possible to have that nuclide borrow yields from another nuclide by indicating
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the other nuclide in a single `parent` attribute. For example:
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.. code-block:: xml
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<neutron_fission_yields parent="U235"/>
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