How to deal with Strong Anisotropic Scattering in multigroup Monte Carlo

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Hi everyone! I wonder how to deal with Strong anisotropic scattering when using P1 multigroup mc neutron transport? for example when p1=1 p0=0.3 （p0 p1 ：0/1 order scattering matrix）?
 

Thread 'MCNP6 BURN Card Issue: Zero Burnup for Material in Fuel Assembly'

Hello everyone, I am currently working on a burnup calculation for a fuel assembly with repeated geometric structures using MCNP6. I have defined two materials (Material 1 and Material 2) which are actually the same material but located in different positions. However, after running the calculation with the BURN card, I am encountering an issue where all burnup information（power fraction(Initial input is 1,but output file is 0), burnup, mass, etc.） for Material 2 is zero, while Material 1...
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