Replicate the energy spectrum is very difficult

Particles, Track, Event, Run and Biasing
1

IMG20251120114057
IMG202511201140571920×1440 835 KB

test38.txt (805 Bytes) the reference example

gpsneutron.txt (2.7 KB) the original spectrum

using the example extend eventgeneration expgs test38 as input energy specteum, the result as show, it is wrong, who can give me suggestion where did this peogram go wrong

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Your explanation seems a bit loose… I am not familiar with the example you mention. Could you further explain what the problem is?

Without even going further, I can pinpoint two comments:

  1. y-axis on a log scale prob. gives you a better view.
  2. energy down to 1e-9 keV? Isn’t it too low?
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thank you bro, the keypoint is scale set, the energy spectrum is ok ,

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