From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Tue Sep 19 2006 - 18:21:58 CEST
I know for sure for what concerns the *_sum.lis file, but I don't know about
the *_tab.lis file, which is a recent addition (by Paola, I think).
Paola, can you answer this question?
Alberto
On Tue, 19 Sep 2006, Sebastien WURTH wrote:
> All right, apparently, it was not very clear for me, although I saw it
> (the fact that you must not multiply again by 2 pi or 4 pi) by
> experience on comparing some USRTRACK an "similar" USRBDX results...
> But then with the same example (one angular bin), in the *_tab.lis file
> when it says "integrated over solid angle" at the first lign, it refers
> to the differential Flux as a function of energy in (Part/GeV/cmq/pr) in
> *_sum.lis file, I do have to multiply by each energy bin value to obtain
> integrated flux in part/cmq/pr. Am I right this time ?
>
> Thank you.
> Regards.
> Sebastien.
>
> Alberto Fasso' a écrit :
>
> >Be careful: the manual says that you must multiply by 2 pi or 4 pi,
> >but assuming that you do the integration yourself. The usxsuw program
> >takes already care of that, so you must not do it again
> >
> >Alberto
> >
> >On Tue, 19 Sep 2006, Sebastien WURTH wrote:
> >
> >
> >
> >>Hello,
> >>
> >>In your example, you cannot have a neutron fluence, you put WHAT(2) =
> >>7.0 in your first USRBDX card, this would give you photon fluence (maybe
> >>you choose only the wrong example to illustrate).
> >>To answer your question (I was asking me the same one once), I quote the
> >>manual from USRBDX part :
> >>*********
> >>Notes
> >>1. IMPORTANT! The results of a USRBDX boundary crossing estimator are
> >>always given as double differential
> >>distributions of fluence (or current) in energy and solid angle, in
> >>units of cm−2 GeV−1 sr−1 per incident primary,
> >>even when only 1 interval (bin) has been requested, which is often the
> >>case for angular distributions.
> >>Thus, for example, when requesting a fluence or current energy spectrum,
> >>with no angular distribution, to
> >>obtain integral binned results (fluence or current in cm−2 per energy
> >>bin per primary) one must multiply the
> >>value of each energy bin by the width of the bin (even for logarithmic
> >>binning), and by 2 pi or 4 pi (depending
> >>on whether one-way or two-way scoring has been requested).[...]
> >>*********
> >>
> >>Best Regards.
> >>Sebastien.
> >>
> >>
> >>
> >>
> >>Nicole Patricia Lee Pratt-Boyden a écrit :
> >>
> >>
> >>
> >>>Hello,
> >>>
> >>>I'm using a USRBDX card to score neutron fluence (linear angular and
> >>>energy bins). The programme seems to be running fine, and I'm compiling
> >>>the data with the usxsuw.f programme.
> >>>
> >>>I asked for eight energy bins, and one angular bin.
> >>>
> >>>USRBDX 101.0 7.0 -48.0 3.0 4.0 400.0
> >>>PH-199m
> >>>USRBDX 6.5E-4 2.5E-4 8.0 0.0 1. &
> >>>
> >>>The *_tab file only returns the differential fluence integrated over
> >>>solid angle; there are no double differential values returned at all,
> >>>no mention of solid angle boundaries.
> >>>
> >>>Assuming this is fine, do I still need to multiply the differential
> >>>values by 2PI (one-way scoring) in order to get diff. fluence in
> >>>particles/GeV/cm^2/primary, or do I only do this if I want fluence
> >>>(/cm^2/pr)?
> >>>
> >>>Apologies if this is extremely simple, I was just thrown by the lack of
> >>>any information for the double differential! Best regards,
> >>>
> >>>Nicole Pratt-Boyden.
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >
> >
> >
>
>
-- Alberto Fassò SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025 Phone: (1 650) 926 4762 Fax: (1 650) 926 3569 fasso@slac.stanford.edu
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