Dear Paola :
Thank you very much for your advice.
I tried AUXSCORE card and BEAMPART as a filter,but the result seems to
be the same.
I tried proton as a filter (which is my primary particles), the value is zero.
Neutron as a filter, the result is the same as BEAMPART.
Sorry for my late problem
2009/1/12 Paola Sala <paola.sala_at_mi.infn.it>:
> Dear Lee,
> I think that the discrepancy is due to secondary particles: in the
> USRYIELD, you score neutrons generated by the primary protons together
> with the products from secondary particles.
> You should select the oprimary interactions only with the AUXSCORE card
> (see the manual) , asking BEAMPART as a filter.
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