Dear Sung Hun Kim,
For the physics model implemented in FLUKA, either look in the manual or in the course material. What is relevant for you is energy loss for charged particles, transport of neutrons (from p,n reactions in your case) which below 20 MeV is performed using a multi-group and evaluated data sets (available in FLUKA suitable format for the most common materials and isotopes).
https://indico.cern.ch/event/442634/contributions/1096514/attachments/1186024/1719467/14_Ionization_and_Transport_2015.pdf
https://indico.cern.ch/event/442634/contributions/1096545/attachments/1185419/1718292/11_Hadronic_Interactions_2015.pdf
https://indico.cern.ch/event/442634/contributions/1096544/attachments/1185163/1717805/10_Low_Energy_Neutrons_2015.pdf
Note that in your energy range, you might be at the limit for which the model for proton interactions and neutron production can be applied. I would first check consistency of the results with available data for neutron production resulting from proton interactions your target material. While the spirit in FLUKA is not to "tune" the physics model, you still need to specify some parameters (transport threshold and accuracy related parameters...)
Greetings
Joachim
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Sung Hun KIM
Sent: 08 August 2016 05:04
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: About default physics model of proton
Dear fluka users,
I am calculating radioactivity of cyclotron which uses 18 MeV proton impinging on H218O target.
For transportation of the particles of proton and neutron, I did nothing on setting for physics models.
In this situation, what physics models are applied for the particles?
I think, for sure, the default physics models are applied but I cannot find any information about this default models.
Can any body let me know?
Best wishes,
Sung Hun Kim
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Sung Hun Kim, MS-PhD integrated course
Department of Nuclear Engineering, Hanyang University
222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Korea
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Received on Tue Aug 09 2016 - 13:26:35 CEST