How can I turn off variance reduction for F8 Tally?

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Ludovic Mathieu

Can you give more details about what are your source particles and/or detected particles.

The F8 tally is very sensitive (i.e doesn't like) to F8 tally. Only few variance reduction techniques are allowed.

Malihe Rostampour

I am trying to calculate reaction cross section via MCNPX2.6. I used FT8 to count residual nuclide. when I consider photo reactions in photon physics the flowing fatal error is given:

photonuclear production does variance reduction with f8.

Is there any way to fix this problem?

Mohd Rafi mohd solleh

study the variance reduction first......