14MeV neutrons in MCNP interact with carbon without producing alpha

[jianggong]

14MeV neutrons in MCNP interact with carbon without producing alpha particles and protons, yes Questions about my cross section data?
I've tried ENDFB8/B7.1, JEFF3.3, JENDL5, CENDL3.2 without any results, but if you use phys:n model, it looks like alpha particles will be produced, but it doesn't seem to be what I expected. How can I solve it? Thanks!

 

[PSRB191921]

Hi,
The 7th parameter of the “phys:n” card and “phys:p” must be set to 1 to ensure the generation and transport of recoil and (n,p) protons as well as recoil heavy ions.
The 1st entry of the “cut:h, a, #” card must set to 1 keV to transport the whole particles above this cut-off energy.
In order to improve the release of secondary alpha, the INCL4/ABLA model is turned on adding the LCA card with the 9th entry, “icem” set to 2.
You can see this publication :
https://www.researchgate.net/public...ssment_for_neutrons_between_100_keV_to_19_MeV

 

[jianggong]

Thank you very much for your answer, but after I modified it according to your prompt, it shows that I used it incorrectly. Is there any problem

 

[jianggong]

When heavy ion transport is cancelled, the program is ready to run. However, the physical model must also be used, and the α transport results are different from the measured results, but the PHITS results are accurate. Don't know what the problem is

 

[Alex A]

I'm not sure I can help much, but do you need heavy ion transport for the results or will production rate do?

Have you tried plotting the cross section? Warnings that models are being used is normally a sign cross section tables are missing.

I notice @PSRB191921 said to set phys n and p cards (neutron and photon) and you've set n and h cards (neutron and proton) and I don't know if this is a correction or a mistake.

 

[jianggong]

I'm not sure I can help much, but do you need heavy ion transport for the results or will production rate do?

Have you tried plotting the cross section? Warnings that models are being used is normally a sign cross section tables are missing.

I notice @PSRB191921 said to set phys n and p cards (neutron and photon) and you've set n and h cards (neutron and proton) and I don't know if this is a correction or a mistake.

Thank you very much for your reply. I need to calculate the energy spectrum deposited by alpha particles generated by neutron and C in C. Currently, the program cannot carry out INCL physical model and heavy ion transport at the same time. When I use the physical model of neutron and C alone and make alpha particles deposit energy in the way of INCL, the program can run. However, there is a certain gap between the transport results and PHITS. I don't know what the problem is.