Dear Davide,
thank you for your quick reply. Yes, you understood correctly what I need to estimate and your answer was clear. However, I have additional questions:
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I don’t think it’s a problem that in Active mode the prompt gammas are not scored. I added another USRTRACK card without any associated DCYTIMES and from that I get only the prompts. Afterwards I can compare the two, correct?
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I found an issue with the TIME-CUT card: my experiment lasts for 10 mins, so 6E11 ns. This number seems to be too big for FLUKA, which gives an error (see attached image “TIME-CUT error”). With smaller numbers the simulation runs properly.
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Moreover, I believe that the TIME-CUT approach won’t give me exactly the result I want. If I understood correctly, FLUKA is tracking the particle’s time since when it’s created and, if the elapsed time becomes larger than the cut time I’m setting with TIME-CUT, the particle is not killed. However, in the real experiment, the neutron flux lasts for 10 mins, meaning that a neutron emitted 9m59s after the start of the experiment will have only 1 s to generate valid delayed gammas, so the probability of seeing a 487keV from an activated La140 by this neutron is smaller. Is there a way in which I can implement this?
Bonus question: If I’m scoring photons and I’m also specifying the volume of the target, the USRTRACK output is in ph/(cm^2 pri GeV). I can then multiply the score by the corresponding energy bin width and by the number of primaries expected in the real experiment and I’m left with ph/cm^2. From what I understood, 1/cm^2 is given by track length/volume of the region. How can I retrieve the track length to get the unit to ph? I’m also interested in using the DETECT card instead of USRTRACK, but I can’t find on the manual the unit of its output.
Thank you in advance,
Giacomo
