**From:** Alberto Fasso' (*fasso@SLAC.Stanford.EDU*)

**Date:** Tue Sep 19 2006 - 18:21:58 CEST

**Previous message:**Sebastien WURTH: "Re: Plotting USRBDX with one angular bin"**Maybe in reply to:**Nicole Patricia Lee Pratt-Boyden: "Plotting USRBDX with one angular bin"**Next in thread:**Giuseppe Battistoni: "Re: Plotting USRBDX with one angular bin"**Reply:**Giuseppe Battistoni: "Re: Plotting USRBDX with one angular bin"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

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

**Previous message:**Sebastien WURTH: "Re: Plotting USRBDX with one angular bin"**Maybe in reply to:**Nicole Patricia Lee Pratt-Boyden: "Plotting USRBDX with one angular bin"**Next in thread:**Giuseppe Battistoni: "Re: Plotting USRBDX with one angular bin"**Reply:**Giuseppe Battistoni: "Re: Plotting USRBDX with one angular bin"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

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