Re: Common problem, unclear solution

From: Vadim Talanov <>
Date: Thu, 9 Apr 2009 14:51:21 +0200


A receipt (not the answer) seems common to any multi-group MC code - define it
as a compound, i.e.


Two additional questions:

1) Is there now NO way to switch the low-energy neutron transport OFF? (== is it
activated with any valid value of DEFAULTS?)

If yes:

2) Does FLUKA attempt to prepare the low-energy neutron cross-sections EVEN if
the production and transport thresholds are implicitly set above 20 MeV?


Joel DeWitt wrote:
> fluka-discuss:
> This problem is cited repeatedly on the discussion board:
> "Low energy neutron xsec not found for some media"
> The solution to this problem, however, is unclear to me. I don't
> understand how a material (graphite) I've added from the Flair
> database does not have low energy neutron cross-sections properly
> associated with it.
> Any help in resolving this issue will be helpful since I have other
> inputs with an identical problem.
> Joel DeWitt
> Oklahoma State University
Received on Tue Apr 14 2009 - 17:59:49 CEST

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