Re: Usryield unit

From: Francesco Cerutti <>
Date: Wed, 20 Mar 2013 18:44:20 +0100

Dear Julie

the cross section is already given in mb (as written in the output file).
Note that plain double-differential cross section (default USRYIELD
choice you are asking for) is just plain double-differential yield
(recommended choice) multiplied by the inelastic cross section of the beam
particle (meaning the particle identity and energy specified in the BEAM
card) for the requested material. This makes sense only in case of a
thin target where no reinteraction and beam energy degradation take



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

On Tue, 19 Mar 2013, Julie Barbier wrote:

> Dear fluka users,
> Â
> In the manual it is written that physical units consistently used in Fluka
> are, for distances, centimeters and derived units cm² for areas, cm³ for
> volumes…
> So should I understand that if I use the USRYIELD card to score plain
> double-differential cross section (d2 sigma / d x1 d x2) the result will be
> express in cm²/GeV/sr ? Or is the conversion in mbarns automatically done ?
> Â
> Thank you for your help and best regards,
> Â
> Julie
> Â
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Received on Wed Mar 20 2013 - 19:38:02 CET

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