.. _sec-data.origen:

=====================
ORIGEN data resources
=====================
.. sectionauthor:: I. C. Gauld, D. Wiarda, M. Pigni, W. Wieslequist

ORIGEN data resources include nuclear decay data, multigroup neutron
reaction cross sections, neutron-induced fission product yields, and
decay emission data for photons, neutrons, alpha particles and beta
particles. The nuclear decay data are based primarily on ENDF/B-VII.1
evaluations. The multigroup nuclear reaction cross section libraries now
include evaluations from the JEFF-3.0/A neutron activation file
containing data for 774 target nuclides, more than
12,000 neutron-induced reactions, and more than 20 different reaction
types below 20 MeV, provided in various energy group structures.
Energy-dependent ENDF/B-VII.0-based fission product yields are available
for 30 fissionable actinides. Gamma-ray and x-ray emission data
libraries are based on ENDF/B-VII.1. The photon libraries contain
discrete photon line energy and intensity data for decay gamma and
x-rays emission for 1,132 radionuclides, prompt and delayed continuum
spectra for spontaneous fission, :math:`\left( \alpha,n \right)` reactions in oxide fuel,
and bremsstrahlung from decay beta (electron and positron) particles slowing
down in either a UO\ :sub:`2` fuel or water matrix. Methods and data
libraries used to calculate the neutron yields and energy spectra for
spontaneous fission, :math:`\left( \alpha,n \right)` reactions, and delayed neutron
emission are adopted from the SOURCES4C code. Capabilities to calculate
the beta and alpha particle emission source and spectra have also been added.

.. toctree::

  ORIGEN Data Resources <origen-data-resources>
  Data resource formats <appendix/resource-formats>
  ORIGEN "end7dec" nuclide set <appendix/origen-end7dec>
  Data Resource Contents <appendix/resource-contents>