Re: Question about USRYIELD double differential scoring options

Hi Ray

> Can someone explain how the two options "plain double differential
> cross-section" and "plain double differential yield" are related?

forget about the first one (which by the way is the default choice!) since
it multiplies the latter by the beam particle nuclear cross section (at
beam energy) in the material indicated by the user in the same USRYIELD
WHAT(12) field (see the manual: ixa + 100 * ixm, where ixa indicates the
kind of yield or cross section desired and ixm the target material if
needed in order to calculate a cross section, otherwise ixm = 0), which
typically - as in your case - should be set to 3.0 (ixa=3 and ixm=0).

Ciao

Francesco

**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854

On Tue, 27 Nov 2012, Ray F. Cowan wrote:

> Hi,
>
> The USRYIELD card has several scoring options.
>
> Can someone explain how the two options "plain double differential
> cross-section" and "plain double differential yield" are related?
>
> I'm looking at particles crossing from a target region of tungsten
> into vacuum and using USRYIELD to obtain the yield distribution of
> a function of angle (0 to pi) and energy (in a single bin).
>
> Thank you,
> --Ray
>
>
>
>
Received on Thu Nov 29 2012 - 10:29:35 CET