Semi-Analogue modes in both DCYSCORE and RADDECAY

Scoring
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Dear FLUKA experts：
Hello , I found there are Semi-Analogue modes in both DCYSCORE and RADDECAY while working on RIB experiments. Could you please explain the differences between them and guide me on how to choose the correct mode?

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Thanks.
Lee

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Dear lway,

Thanks for your question and welcome to the community!

When you set WHAT(1) in the RADDECAY card as >1 (Semi-analogue mode) each single radioactive nucleus is treated in a Monte Carlo way (random daughter nuclides are produced and random radiation is produced and tracked). However, this decay information will be scored by a given detector card only if there is also a DCYSCORE card with WHAT(1)=-1 (Semi-analogue) associated to it. Without it, no information coming from the radioactive decay will be scored (but only prompt radiation).

To get a deeper understanding, please have a look to the manual where RADDECAY and DCYSCORE cards are described. Notes at the end of the page might also be of help!

https://flukafiles.web.cern.ch/manual/chapters/description_input/description_options/raddecay.html#raddecay

https://flukafiles.web.cern.ch/manual/chapters/description_input/description_options/dcyscore.html

Let me know if I was not clear,
Cheers,
Marco

1 Like
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Dear Marco,

Thank you for your helpful response and the links to the relevant sections in the manual. Your explanation of how the Semi-analogue mode works in RADDECAY and DCYSCORE cards was clear.

I apologize for the delay in my response, which was due to unforeseen circumstances. I appreciate your patience and understanding as I catch up with my work.

Regarding my previous question, I would like to know what happens if I select “active” mode in RADDECAY and choose “Semi-analogue mode” in DCYSCORE instead of “-1”? I would appreciate any clarification you can provide about the outcome in this case.

Thank you again for your help.

Best regards,

lway

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Dear Lway,

Sorry for my late reply. In the FLUKA manual such case is not documented, RADDECAY = active is always associated to a given DCYSCORE where the selected value is a defined cooling time. While RADDECAY = semi-analogue is always associated to a DCYSCORE = semi-analogue. My suggestion is to use these scoring cards as indicated by the manual.

Additionally, in the attached documents, you will find a flair file with a test with two scorers:

  • RADDECAY = semi-analogue associated with DCYSCORE = semi-analogue (correct use)
  • RADDECAY = active associated with DCYSCORE = semi-analogue

As you will see after running a simulation, the produced results are different, I would therefore suggest you not to use the second approach.

Cheers,
Marco

activation_exercise_solution_mod.flair (4.4 KB)

1 Like
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Dear Marco,

Thank you for your response and for providing clarification on the usage of RADDECAY and DCYSCORE in the FLUKA manual. I appreciate your suggestion to follow the instructions in the manual and use the recommended scoring cards.

Lastly, I would like to extend my heartfelt appreciation for your contribution to the development of this discussion. Your insights and expertise have been invaluable to me, and I feel fortunate to have the opportunity to engage and learn from you.

Thank you once again for your assistance.

Best regards,
Lway

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When RADDECAY = active, DCYSCORE = semi-analogue just gives the prompt contribution, identical to the scoring result without DCYSCORE at all.

1 Like
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For completeness, flair file has been corrected and the cards PHYSICS/IONSPLIT and PHYSICS/PEATHRES have been removed.
activation_exercise_solution_mod.flair (4.3 KB)

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