A Puzzle of Muon and Decay Light in EJ-200

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Description

Dear FLUKA experts
I have a question. Currently, I have a model (muons incident into an EJ-200 scintillator, with fluscw recording the emerging visible light photons from EJ-200). I have obtained the following information (two peaks are clearly visible—one from the visible light excited by the energy deposition of muons, and the other from the visible light excited by decay electrons). However, I am unsure why the second peak is so much smaller than the first one.

Input files

fluscw.f (6.1 KB)

FLUKA_geometry.inp (2.6 KB)