Interpreting energy division in the 'Run Summary'

Scoring
1

Dear FLUKA community,

I’m running simulations of neutron transport and defect production on quartz samples (SiO2). In the output file, specifically on the ‘Run Summary’, I receive the following information:

1.0000E-03 (100.%) GeV available per beam particle divided into
Prompt radiation Radioactive decays
0.0000E+00 ( 0.0%) 0.0000E+00 ( 0.0%) GeV hadron and muon dE/dx
1.3046E-07 ( 0.0%) 0.0000E+00 ( 0.0%) GeV electro-magnetic showers
0.0000E+00 ( 0.0%) 0.0000E+00 ( 0.0%) GeV nuclear recoils and heavy fragments
0.0000E+00 ( 0.0%) 0.0000E+00 ( 0.0%) GeV particles below threshold
0.0000E+00 ( 0.0%) 0.0000E+00 ( 0.0%) GeV residual excitation energy
2.3189E-04 (23.2%) 0.0000E+00 ( 0.0%) GeV low energy neutrons
7.5656E-04 (75.7%) 0.0000E+00 ( 0.0%) GeV particles escaping the system
0.0000E+00 ( 0.0%) 0.0000E+00 ( 0.0%) GeV particles discarded
0.0000E+00 ( 0.0%) 0.0000E+00 ( 0.0%) GeV particles out of time limit
1.1412E-05 ( 1.1%) GeV missing

How should I interpret the energy divided into low energy neutrons? Is this energy utilized for the production - i.e. (n, 2n) reactions - of low energy neutrons?

Kind Regards,
Matheus Bergamo
Gleb Wataghin Institute of Physics at UNICAMP

3

Hallo Matheus,

no, it’s the energy deposited by the charged products of low energy neutron reactions. Due to the specificities of the treatment applying to the latter ones, they are not explicitly generated, but their energy is deposited at the reaction point (in the kerma approximation, see Chapter 10 of the manual). Best