Impact of Air Activation Caused by Proton Accelerator Target Shooting

Advanced Features and User Routines
1

Dear FLUKA community,
I am using a 30MeV proton beam to bombard a GaNi alloy target. I want to focus on the degree of activation of air or surrounding materials during the target shooting process. I have conducted a series of studies and finally set a 400uA beam current using the IRRPROFI card, while setting the cooling time using DCYTIMES, and using RESNUCLE for activation statistics. However, the final results are not ideal. According to theoretical calculations, isotopes such as O-15 and Ar-41 will be produced during the air activation process, but in my results, the statistics of O-15、N-14 is 0, and the yield of Ar-41 is very low. I want to know where the problem lies. Below is my inp file。

Thank you all very much in advance for any help you provide!

Best regards

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re1.lis (9.8 KB)
re2.lis (9.8 KB)
re3.lis (9.8 KB)
test.flair (11.6 KB)
test.inp (6.6 KB)

4

Dear Zhao Peng,

I believe the main reason for the underestimated production of O15 isotope in zour model is that one of the dominant O15 production channels (and some other isotopes including Ar41) is interaction with secondary low-energy neutrons, not just high-energy protons.

You have to use LOW-PWXS card to activate it, and to install corresponding libraries: FLUKA libraries for low-energy neutron pointwise interaction cross sections | The official CERN FLUKA website

Also, use a shorter cooling time to see O15 isotopes fraction, as they have relatively short half-life time.

Also check RADDECAY card settings https://indico.cern.ch/event/604018/contributions/2435668/attachments/1395470/2242783/19_Activation_2017.pdf

These changes will drastically increase the resulting number of produced isotopes.

Kind regards,

Illia