Dear Beatrice,
It should be
LOW-MAT HYDROGEN 1. -2. 296.
HYDROGEN
Note that if you use the HYDROGEN isotope for materials other than
PORTLAND, you should define a separate hydrogen specifically for PORTLAND
and use its name in WHAT(1), as shown in the LOW-MAT card example.
Konstantin
Il giorno ven 2 ago 2024 alle ore 18:57 Beatrice Pomaro <
beatrice.pomaro_at_dicea.unipd.it> ha scritto:
> Dear Konstantin,
> thank you very much for your help. I have added card LOW-MAT (attched
> file) but I get the following error message: "undefined atomic density
> for the low en. xsec mat. corresponding to the comp. mat. n. 27". Do you
> have a suggestion also for that?
> Thank you very much,
> Kind regards,
> Beatrice
>
>
> ---
> **************************************************
> Ing. Beatrice Pomaro
>
> Universita' degli Studi di Padova
> Dipartimento di Ingegneria Civile, Edile e Ambientale
> Via F. Marzolo, 9 - 35131 Padova (Italy)
> tel.: +39 049 8275601
> e-mail: beatrice.pomaro_at_dicea.unipd.it
>
>
> Il 02-08-2024 11:06 Konstantin Batkov ha scritto:
>
> Also, if you are interested in accurate neutron transport below a few eV,
> you need to define a thermal scattering kernel for your wall material.
> Otherwise, FLUKA assumes the free gas approximation. To do this, specify
> the wall temperature (room temperature?) and the crystal/molecular bound
> states (hydrogen in a water molecule in your case). If you use groupwise
> neutron transport, do this with the LOW-MAT card with the 1 1 296
> identifiers (see table 10.3). In the case of pointwise transport, define
> the appropriate TSL-PWXS card (the LOW-MAT card is not needed in this case)
> and, of course, use pointwise energy binning in your estimators:
> TSL-PWXS 1.0 1.0 296.0 PORTLAND
>
> Konstantin
>
>
>
>
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Received on Mon Aug 05 2024 - 09:49:24 CEST