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Question Cross-section Biasing Weights 

Forum: Biasing and Scoring
Date: 17 Aug, 2017
From: <ljb>

Hi,

I'm interested in cross-section biasing and have been testing it out with the example GB01. I've modified the code slightly; just to record some hit information in the target. The only biasing I'm applying is a 2x scaling of the cross-section, and only for neutrons.

When I look at the particle weights (recorded for each particle step in the target), there is a distribution of weights that includes values > 1.

This is surprising to me; I thought the weight would be set by (unweighted process cross-section)/(weighted process cross-section). If that's true then there should be events that are weighted by 0.5 (neutron interactions), and events that are weighted by 1 (non-neutron interactions), and any multiple of 0.5 (for successive neutron interactions). So why are there weights > 1?

Lindsey.

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1 None: Re: Cross-section Biasing Weights   (Marc Verderi - 21 Aug, 2017)
(_ Ok: Re: Cross-section Biasing Weights   (ljb - 22 Aug, 2017)
(_ None: Re: Cross-section Biasing Weights   (Marc Verderi - 23 Aug, 2017)
1 Question: Re: Cross-section Biasing Weights   (ljb - 28 Aug, 2017)
1 None: Re: Cross-section Biasing Weights   (Marc Verderi - 28 Aug, 2017)
2 Ok: Re: Cross-section Biasing Weights   (ljb - 28 Aug, 2017)
3 Ok: Re: Cross-section Biasing Weights   (ljb - 28 Aug, 2017)
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