Re: Low energy neutrons at very low temperature

Difficult to say, but you can do some tests.
1) Try both 293 and 87 K, and see if there is a large difference
in the results. That can possibly give an idea of the sensitivity
of the problem to a change in temperature.
2) Try a re-scaling of the temperature using MAT-PROP with
SDUM = LOWNTEMP (see the manual). It is not very accurate, but again, you can
get some feeling about the sensitivity.

Alberto

On Wed, 16 Apr 2008, webmaster@pradaimmobiliare.it wrote:

> Dear Fluka experts
> I would like to calculate the activation of some metallic components (mostly
> iron and copper), kept at the temperature of liquid helium (about 2 K), after
> the irradiation due to a proton beam.
> I see in the manual that I can select, for the low energy neutron cross
> sections of my interest, only the temperatures of
> 293 or 87 Kelvin.
> According to your experience, what are the possible biases if I select the
> 87 K case?
> Are these low energy neutron cross sections relevant for the activation
> calculation?
>
> Kind regards
> Arturo Busetti
>

-- 
Alberto Fasso`
SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025
Phone: (1 650) 926 4762   Fax: (1 650) 926 3569
fasso@slac.stanford.edu