Card 5: Spallation and neutron irradiation options
--------------------------------------------------

.. _`param:amp`:

.. rst-class:: no-caption-number

.. list-table:: **AMP** :phits-same:`PHITS: same name`
   :header-rows: 0

   * - Value
     - Description
   * - (D=1.0, D\ :sub:`P`\ =automatically calculated [#]_, requires ``JMODE``\ =0,2)
     - A factor to normalize activation by primary beam(particle mA). Please note that this factor is not applied to activation by secondary neutrons. When the source intensity is 1(source/s), the value is 1.6022E-16(particle mA) regardless of the source particle species.

.. _`param:ebeam`:

.. rst-class:: no-caption-number

.. list-table:: **EBEAM** :phits-same:`PHITS: same name`
   :header-rows: 0

   * - Value
     - Description
   * - (D=3.0, requires ``JMODE``\ =0,2)
     - Primary beam energy in [GeV]. [#]_

.. _`param:prodnp`:

.. rst-class:: no-caption-number

.. list-table:: **PRODNP** :phits-same:`PHITS: same name`
   :header-rows: 0

   * - Value
     - Description
   * - (D=1.0, requires ``JMODE``\ =0,2)
     - Neutron yield per input primary beam. This option is used to calculate the neutron flux from neutron spectra in MCNP output (when ``FLUXS``\ =-1) and thus is effectively deprecated.

.. [#]
   ``AMP`` is calculated using the PHITS [T-Dchain] input parameter ``amp`` (inputted in source/second) multiplied by :math:`1.602177\times 10^{-16}` mA/e. DCHAIN will automatically convert this back into particles/second by dividing ``AMP`` by :math:`1.602177\times 10^{-16}`. If simulating a beam with a charge other than :math:`\pm`\ \ 1 and manually manipulating the value of ``AMP`` in the DCHAIN input deck, please keep this conversion in mind. Additionally, DCHAIN’s ``AMP`` parameter has no influence on the neutron flux, which is set by ``FLUXS`` in each region; however, PHITS does calculate ``FLUXS`` using the ``amp`` parameter in [T-Dchain].

.. [#]
   ``EBEAM`` is only used meaningfully if ``ITDECS``\ \ =1 to calculate the spallation/destruction cross section of the target material from incident protons at ``EBEAM`` GeV using Pearlstein systematics :cite:`Pearlstein1987`. Note that this cross section is only used for reducing the beam flux as the target material is depleted, scaling down production of all other nuclides which originate from the target; the negative yields present in the \*.dyld file generated by PHITS control the actual target nuclide depletion rates. Otherwise, ``EBEAM`` is only used to calculate beam power in MW displayed in the output files.