Dear Fluka Experts, I want to simulate a neutron source with following definition of its energy spectrum. For energies 0 eV - 0.625 eV (Maxwell distribution) for energies (0.625 eV- 122 keV) (as function of 1/E) for energies (122keV - 10 Mev) - (as per crannberg watt function for fast neutrons) …

Dear @mayank.rse , I suggest using source_newgen.f instead of source.f user routine, since it is more user friendly. In the attached file you need to look at the code starting at line 194. This is where you need to define the energy spectra - I already put the first two conditions. In the present …

Thank you so much. I will try this and get back.

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Defining neutron spectrum

Source Definition

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