Re: [fluka-discuss]: missing neutron cross sections

From: Francesco Cerutti <>
Date: Fri, 17 Feb 2017 12:34:29 +0100

Hi Mo,

if you discard neutrons, which cannot be properly transported in the
absence of the respective cross sections, you will get an estimation of
the activation due to the primary beam, neglecting the contribution of
neutron reinteractions. If your target is sufficiently thin, such an
estimation may still make some sense (apart from uncertainties related to
the rather low proton energy).



> Hi Mohamed,

> I had a same prob with the neutron libraries for Tellurium.

> Cheers,
> Shri

(Srinidhi Bheesette)

On 14 February 2017 at 06:16, Benmerrouche, Mohamed

> Dear FLUKA experts/users,
> I am trying to setup an activation study with a 16MeV proton beam on
> Ra-226 target but when I run my input file FLUKA exits with the
> error message:
> ***** Neutron Xsec: ****
> **** Group limits, average energies, velocities and momenta start at
> location 10422717, end at location 10424884 (I*4 addr.) *****
> **** Low energy neutron xsec not found for some media 12 13 ****
> Which indicate that low energy neutron cross sections for Ra-226 are not
> available in the FLUKA code. I checked the FLUKA manual section
> and confirmed that there is NO entry for Radium.
> Any suggestions or thoughts on how to resolve this issue?
> Thanks,
> Mo

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Received on Fri Feb 17 2017 - 13:48:30 CET

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