# Charged particle simulation

FISPACT-II can perform simulations using neutrons and other incident charged particles. The majority of the process is exactly identical to those of simulations using neutron-induced reactions, with minor keyword and input data changes. Access to the most recent TENDL nuclear data offers the ability to simulate with incident proton, deuteron, alpha and gamma particles. To use these the only requirements are:

• Add the PROJECTILE keyword with the correct modifier within the control section of the input
• Modify the group structure using GETXS 1 162, to the CCFE-162 group structure
• Point the files file directories for xs_endf to the correct TENDL folder

For example, the input file should begin with

PROJ 3
GETXS 1 162
FISPACT
* COLLAPSE TENDL-2017 tal-p


for a proton-induced simulation. Within the files file there should be

# Proton-induced cross section data
xs_endf  /path/to/nuclear_data/TENDL2017data/tal2015-p/gxs-162

# Proton-induced fission yields
fy_endf  /path/to/nuclear_data/UKFY41data/ukfy4_1p


Each of the possible incident particles has a different PROJECTILE number, from (nb: FISPACT-II version 4.0+ possesses the options 6 and 7 - previous versions do not have these options):

1. PROJECTILE 1 : Neutron ( 709, 1102, 586 group structures)
2. PROJECTILE 2 : Deuteron (162 group structure)
3. PROJECTILE 3 : Proton (162 group structure)
4. PROJECTILE 4 : Alpha (162 group structure)
5. PROJECTILE 5 : Gamma (162 group structure)
6. PROJECTILE 6 : Triton (162 group structure)
7. PROJECTILE 7 : Helion (162 group structure)