Re: Lutetium in FLUKA

From: Alberto Fasso' <fasso_at_SLAC.Stanford.EDU>
Date: Thu, 30 Jun 2011 11:37:46 -0700 (PDT)

Dear Francesca,

if card DEFAULTS is absent, the default becomes that of NEW-DEFA, for which
neutron transport is on. To switch it off, you must give a card LOW-BIAS
with WHAT(1) = 1. (You may look it up on the manual).
The command LOW-NEUT is not used to switch on low energy neutron transport,
but to select a neutron library (if more than one is available) or to
request neutron pointwise transport (when possible) or to bias the fission
neutron multiplicity.



On Thu, 30 Jun 2011, Francesca Nessi-Tedaldi wrote:

> Dear FLUKA experts
> I am setting up cards to calculate the residual ambient dose at various
> cooling times after an irradiation with multi-GeVprotons of a compound
> containing Lutetium. Although I have not enabled low-energy neutron transport
> (card LOW-NEUT absent, card DEFAULTS absent), I get an error message "Low
> energy neutron xsec not found" for Lutetium. I am aware of the fact that the
> low-energy neutron cross-sections are not available in the library. But why is
> FLUKA looking for them, if LOW-NEUT is not enabled? and how to tell it not to
> do so?
> Thank you very much for any help.
> Cheers
> Francesca
Received on Thu Jun 30 2011 - 21:54:42 CEST

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