Re: [fluka-discuss]: USRYIELD

From: Paola Sala <paola.sala_at_mi.infn.it>
Date: Mon, 24 Jun 2019 11:50:04 +0200

Hello
The normalization is not correct and there is an error in the USRYIELD
definition:

For the normalization, quoting from from the manual:
" 6) In the case of polar angle quantities (|ie| or |ia| =
14,15,17,18,24,25) the differential yield is always referred to solid
angle in steradian, although input is specified in radian or degrees."
this means that the normalization for a full solid angle scoring
corresponds to 4*pi =~ 12.6

BUT: the angle is a "polar angle with respect to a direction". Thus the
full angular coverage is obtained with angles between 0 and pi , not
between 0 and 2*pi. Giving 2*pi (or 360 degrees) as upper limit produces
a crash, giving an angle next to 360 degrees gives wrong normalization.
We will protect this issue in the next respin.

So, please change the upper limit to pi, and use 4pi as normalization

Another warning: since you are scoring low energy neutrons,
in the tab and sum files you will also find values for all the 260 low
energy neutron groups, with their energy limits, up to 20 MeV, plus 15
intervals from 20 MeV to your maximum energy.

Regards
Paola

Paola
> Hello everybody!
> I would like to ask about USRYIELD normalizatio for the next case
> DCYSCORE 1. 1hour 1hour
> USRYIELD
> AUXSCORE USRYIELD NEUTRON 1hour 1hour
> USRYIELD 1401. NEUTRON -21. COPPER VOID
> 1.1hour
> USRYIELD 0.05 0.0 25. 6.28 0.0 3. &
>
> --
>
> Is it right that as a result to get neutron spectra in neutrons per
> second I need to multiply Fluka result to N=FLUKA
> RESULT*6.28*(Emax-Emin)
>
> Foe example from tab.lis
> Emin Emax dN/dx1dx2 neutrons per second
> 8.6516899E-05 9.8036500E-05 1797.440 1797.440*6.28*
> (9.8036500E-05-8.6516899E-05)
> 9.8036500E-05 1.1109000E-04 2271.186 2271.186*6.28*
> 1.1109000E-04- 9.8036500E-05
>
> Many thanks
> ========================================================================
> С ƒважением,Раƒˆан šаб‹‚аева
> e-mail: kabytayeva_at_jinr.ru
> Best regards, Raushan Kabytayeva tel: +7(49621)62517
> engineer of the RIB group
>
> Scientific and Technical accelerator department
> Flerov Laboratory of Nuclear Reactions
> International Intergovernmental Organization
> Joint Institute for Nuclear Research Joliot-Curie, 6
> Bld 131, office 408
> 141980, Dubna, Moscow region, Russia
>
> ========================================================================
>
> __________________________________________________________________________
> You can manage unsubscription from this mailing list at
> https://www.fluka.org/fluka.php?id=acc_info
>


Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148

__________________________________________________________________________
You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info
Received on Tue Jun 25 2019 - 01:10:29 CEST

This archive was generated by hypermail 2.3.0 : Tue Jun 25 2019 - 01:14:00 CEST