Re: neutron transport threshold

From: Francesco Cerutti <>
Date: Sat, 6 Feb 2010 13:55:21 +0100

Dear Christoph,

since quite some time ago, the neutron transport threshold can be fully
controlled with PART-THR. If you input a value <20MeV, this is translated
into the respective group (which will become the cutoff group); moreover,
one can *raise* locally the threshold on a region basis with LOW-BIAS
(obviously not above 20MeV). If instead you give in PART-THR a value
>20MeV, the low energy neutron transport is not activated at all,
regardless of the implicit request from the DEFAULTS settings and of the
explicit presence of LOW-NEUT in the input (which by the way in this case
is clearly contradictory). Why do you talk about conflict?



Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Tue, 26 Jan 2010, Christoph Bobeth wrote:

> Dear FLUKA users,
> I would like to raise the neutron transport cutoff threshold above 20 MeV
> using PART-THR, but this seems to conflict with LOW-NEUT. How can
> I deactivate the LOW-NEUT card?
> With best regards,
> Christoph Bobeth.
Received on Sat Feb 06 2010 - 20:48:28 CET

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