Killing fission neutron

Physics, Transport and Magnetic Fields
1

Versions

FLUKA: 4.5
Flair: 3.4-4

Description

Dear Fluka expert,

I am trying to recognize and kill neutron from fission.

For this purpose, I am trying the following in a mdstck routine:

  IF (LFSSSC) THEN
     DO IP = 1, NP
        IF (KPART(IP) .EQ. 8) THEN
           WEI(IP) = 0.0D0  
        END IF
     END DO
  ENDIF

But it does not seem to work since I still see new neutrons generated.

I have also tried to flag those particles in the mdstck routine and kill them in a usrmed routine as follows but I don’t get any better:

  IF (KPROJ .EQ. 8) THEN
    IF (ISPARK(1, NPFLKA) .EQ. 99) THEN       
     WTSCO = 0.0D0    
    END IF
  END IF

Additionally, I noted that it seems to behave quite differently if I activate or not the pointwise cross-sections.

Is there something I am missing or is this not possible ?

Thanks for your help.

Best regards,

Thomas

2

Hi Thomas,
did you switch to 4-5.1?
Your mdstck.f logic should now work in the recommended pointwise mode thanks to the bug fix documented in the RELEASE-NOTES after being triggered by a forum post of 4 months ago.