From: Sebastien WURTH (wurth@ipno.in2p3.fr)
Date: Tue Sep 19 2006 - 17:00:10 CEST
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.
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>
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