Re: [fluka-discuss]: fluka 2020 Low energy neutron xsec not found for some media - Oxygen

From: Answers <>
Date: Thu, 4 Jun 2020 15:37:23 +0200 (CEST)

Dear Angel

the neutron cross sections for Oxygen moved sometimes ago to Endf/B-VIII.0
where data for O-17 and O-18 are also available.

Following this change, the identifiers for Oxygen are no longer 8 16 296
but rather 8 -2 296 to reflect that now the natural composition is
available, and no longer O-16 only.
Sorry if the change was not properly advertised, you can always check in
the manual the identifiers for the low energy cross sections in case of

On Thu, 4 Jun 2020, angeld wrote:

> Dear FLUKA experts and users,
> Recently I updated fluka to the newest version (fluka2020)
> and I noticed that my old models won't run. As you can see from the
> attached .out file the last message says:
> **** Low energy neutron xsec not found for some media 5
> 6 ****
> I would be very grateful if someone could tell me what is causing this
> issue, since I don't believe that the oxygen cross-section is missing. I
> have also uploaded the .inp file.
> Regards,
> Angel
> --
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Received on Thu Jun 04 2020 - 17:19:16 CEST

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