From: Nicole Patricia Lee Pratt-Boyden (npp598@bham.ac.uk)
Date: Sun Sep 24 2006 - 01:50:15 CEST
Hi there!
I can't answer in great detail as I'm still learning all this myself.
My understanding is that below 19.6 MeV you are officially into Low
Energy Neutron Transport territory. In that area the FLUKA code uses a
multigroup transport algorithm, which uses 72 energy bins of set width
in the range ~1E-14GeV - 19.6MeV. In this range, your energy bin
boundaries are automatically forced to coincide with these preset ones,
you cannot go smaller. (This can mean that you wind up with more/less
bins than you requested.)
If you have a look in the Fluka Manual (FM.pdf) there's a better
explanation, I think, under the USRBDX entry, and also towards the back
in the blurb about the physics of low energy neutron transport. I hope
folks can correct me if I've got the wrong end of the stick!
Best wishes,
Nicole.
Bhushankumar Jagannath Patil wrote:
>Hello,
>
> I am using USRBDX card to score neutron fluence as
>
>USRBDX 101.0 8.0 -61.0 7.0 6.0
>145.32PhFluenUD
>USRBDX 0.015 1e-14 100.0 &
>
>in this example i have asked for 100 energy bins between the enrgy range
>15 MeV to 1e-5 ev. But the *.tab.lis giving only 72 energy bins in the
>enrgy range 1e-5 ev to 19.6 MeV. where i had made a mistake? when i am
>using following USRBDX card then also it is giving 72 enrgy bins with
the
>same enrgy range.
>
>USRBDX 101.0 8.0 -61.0 7.0 6.0
>145.32PhFluenUD
>USRBDX 1e-08 1e-14 100.0 &
>
>So i want to know how can i set the max and min energy limit in USRBDX
>card to score neutron energy spectrum in the energy range 1e-5eV to 10
ev
>with 100 energy bins.
>
>
>Thanks
>Patil Bhushankumar J.
>
>
>--
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