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Question Re: G4NDL3.13 cross section data  

Forum: Hadronic Processes
Re: Question G4NDL3.13 cross section data (hemiao)
Re: None Re: G4NDL3.13 cross section data (Koi, Tatsumi)
Date: 14 Sep, 2010
From: hemiao <hemiao>

> Hi
> 
> > 1) The Inelastic attenuation coefficient of neutron will increase with
> > larger energy(>1MeV and <25MeV), but the Fig1(cross section changing
> > trend with neutron energy) is not like so, whose data come from
> > G4.9.3p01
> 
> Sorry I am not sure what you mean. What kind of shape do you expect in
> the plot?
> 
> Origin of Gd data is written in README.v3.13
>         source: Gd-152 from ENDF/B-VI Release 8 Tape162
>         source: Gd-154 from ENDF/B-VI Release 8 Tape162
>         source: Gd-156 (neutron) from ENDF/B-VI Tape 106
>         source: Gd-157 (neutron) from ENDF/B-VI Tape 106
>         source: Gd-158 (neutron) from ENDF/B-VI Tape 106
>         source: Gd-160 (neutron) from ENDF/B-VI Tape 106
> 

  Thanks for your quick answer. And sorry that I didn't describe clearly. 
What I mean is the trend of the line should be up and up, but trends of cross 
section of the isotopes of Gd_156 come down with larger neutron energy(>12MeV). 
Is it a bug for G4data?

> > 2) Fig3 is totally different from fig2. Is it means that cross section
> > data of for neutron G4.9.3p01 is the lasted one, while Data were changed
> > during 2007~2010?
> 
> Sorry again, I cannot see the "totally different" result in the figures.
> Could you give me more specific part of the figure, where you felt
> "totally different".
> 
> Tatsumi
> 

   Fig3 and Fig2 have the same trends but the altitude is not the same. In Fig2 
the Gd_152 is the largest one, but in Fig3, Gd_152 cross section value is lower 
than Gd_155. that's really different from Fig2, isn't it?
Because the Fig2 is from talk on 2006, I guess that the data were changed from 
2007 till now, right?

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