Spectrum of 4.43 MeV gammas

Dear FLUKA user

There 4.43 MeV gamma rays from de-excitation of ^{12}C* that accompany neutrons from the Am-Be source. I want to score and plot the spectrum of these gamma rays. I simulated the monoenergetic gamma rays of that energy but I do not get the result I expect.

Please help me understand why this happens

I attach my file4.4MeVGammas.flair (2.0 KB)

Thank you. I figured out the solution to my question.