RE: Score neutron from 16O(p,xn) reaction

From: Vasilis Vlachoudis <>
Date: Mon, 29 Dec 2008 10:22:11 +0100

Dear Lee,

The units:
WHAT(1) =3D 124 therefore
        x1=3Dradians (in reality solid angle [sr])
        x2=3DKinetic Energy [GeV])
Second line WHAT(6) =3D 901 therefore you are requesting
        Sigma(O-16) * dN/ dx1 / dx2 in [mb] / sr / GeV
        The Sigma(O-16) is printed in the the USRYIELD _sum.lis
But as I told you this would had a physical meaning if you normalize by
the number of stars (inelastic interactions) and not by the number of
primaries as fluka is doing at the end.


-----Original Message-----
[] On Behalf Of
Sent: Tuesday, 23 December 2008 03:32
To: Vasilis Vlachoudis
Cc: Francesco Cerutti;
Subject: Re: Score neutron from 16O(p,xn) reaction

Dear Vasilis,

Thank you for your advice.

The non-elastic cross section agrees well with ENDF ,ICRU and FLUKA.

I could get a close result (at least the same order), but the spectrum
The USRYIELD I used gives relatively flat spectrum over 0-11MeV,but ICRU
gives very low results after 3.5MeV.
(attached as excel file)

By the way, where could I find the units (mb/MeV) of output from
USRYIELD , because I searched from the manual (6.1 physical units) and
output file but I did not find it .

Best Regards

Received on Mon Dec 29 2008 - 12:16:18 CET

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