Neutrino-induced reaction model
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.. rst-class:: no-caption-number

.. list-table:: **ntrnore**
   :header-rows: 0

   * - Value
     - Explanation
   * -  | (D=0)
     -  | Options for neutrino-induced reactions.
   * -  | =0
     -  | This reaction mechanism is not taken into account.
   * -  | =1
     -  | This reaction mechanism is taken into account.

By setting ntrnore=1, following reactions are considered;   :math:`^1` H :math:`(\bar{\nu}_e,e^+)n` ,  :math:`^2` H :math:`(\bar{\nu}_e,\bar{\nu}_e^\prime)np` ,   :math:`^2` H :math:`(\nu_e,e^-)2p` ,  :math:`^2` H :math:`(\nu_e,\nu_e^\prime)np` , and elastic  scattering with electrons.  Above 20 MeV, the cross sections of some reactions channels are  extrapolated.  Note that, the reaction channels above 150 MeV (e.g. charge-current  reactions of  :math:`\mu` -neutrinos) are not considered.   :numref:`tbl-neutrino`  shows neutrino reaction systems considered in  the current version of PHITS.  In the case of that considered reaction channel,  :math:`\infty`  or values are  shown as an energy upper-limit. 

.. _tbl-neutrino:

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

.. list-table:: **Charge current**
   :header-rows: 0

   * -  | 
     -  | :math:`e^-`
     -  | :math:`^1` H
     -  | :math:`^2` H
   * -  | :math:`\nu_e`
     -  | :math:`\infty`
     -  | -
     -  | 20
   * -  | :math:`\bar{\nu}_e`
     -  | -
     -  | 150
     -  | 20
   * -  | :math:`\nu_\mu`
     -  | :math:`\times`
     -  | -
     -  | :math:`\times`
   * -  | :math:`\bar{\nu}_\mu`
     -  | -
     -  | :math:`\times`
     -  | :math:`\times`
   * -  | :math:`\nu_\tau`
     -  | :math:`\times`
     -  | -
     -  | :math:`\times`
   * -  | :math:`\bar{\nu}_\tau`
     -  | -
     -  | :math:`\times`
     -  | :math:`\times`

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

.. list-table:: **Neutral current**
   :header-rows: 0

   * -  | 
     -  | :math:`e^-`
     -  | :math:`^1` H
     -  | :math:`^2` H
   * -  | :math:`\nu_e`
     -  | :math:`\infty`
     -  | :math:`\times`
     -  | 20
   * -  | :math:`\bar{\nu}_e`
     -  | :math:`\infty`
     -  | :math:`\times`
     -  | 20
   * -  | :math:`\nu_\mu`
     -  | :math:`\infty`
     -  | :math:`\times`
     -  | 20
   * -  | :math:`\bar{\nu}_\mu`
     -  | :math:`\infty`
     -  | :math:`\times`
     -  | 20
   * -  | :math:`\nu_\tau`
     -  | :math:`\infty`
     -  | :math:`\times`
     -  | 20
   * -  | :math:`\bar{\nu}_\tau`
     -  | :math:`\infty`
     -  | :math:`\times`
     -  | 20

By using the **[ User Defined Interaction ]** section, it is possible to simulate higher energy neutrino reactions. For details, please refer to that section.