Re: [fluka-discuss]: Angle distributions of neutron yield

From: <me_at_marychin.org>
Date: Wed, 21 May 2014 21:05:28 -0700 (PDT)

Dear Bin Wu,
The cards you provided rightly score neutron yield double-differential in cms
polar angle (60 bins) and energy (4 bins), normalised by factors 1000, 111.1,
11.1 and .714 for each energy bin, respectively. That is d2N/dx1dx2 where N is
the yield, x1 is the cms polar angle and x2 is the energy. Whether these
settings are exactly right or not, however, depends on further specificities you
haven't mentioned. For there are indeed different ways 'angular distribution'
and 'yield' can be defined. Please check the normalisation (ref: notes at the
end of the USRYIELD section of the manual) and the eventual units -- which can
be done with a simple run (eg a single particle in a homogeneous medium) where
the answer is known a priori and/or where correspondence can be verified against
neutron production printed by default in the tables towards the end of .out.
:) mary

> On 20 May 2014 at 19:14 "bin.wu" <bin.wu2_at_fds.org.cn> wrote:
>
>
> Dear FLUKA experts,
>
> I want to score angle distributions of neutron yield for different
> groups of energy in spallation target (PbLi) bombarded with 1.5GeV proton
> source, and the score cards were set as below,
>
> USRYIELD 75. NEUTRON -21. -1. -2.
> 1000.0yield
> USRYIELD 180. 0.0 60. 1.0E-3 1.0E-9 3.
> &
> USRYIELD 75. NEUTRON -22. -1. -2.
> 111.1yield
> USRYIELD 180. 0.0 60. 1.0E-2 1.0E-3 3.
> &
> USRYIELD 75. NEUTRON -23. -1. -2.
> 11.11yield
> USRYIELD 180. 0.0 60. 1.0E-1 1.0E-2 3.
> &
> USRYIELD 75. NEUTRON -24. -1. -2.
> 0.714yield
> USRYIELD 180. 0.0 60. 1.5 1.0E-1 3.
> &
>
> Were these settings right?
>
> Regards,
>
> Bin Wu
>
Received on Thu May 22 2014 - 07:21:38 CEST