Dear Jesutofunmi,
My apologies for the delay and thanks for clarifying (when you said “new” in your previous post I assumed you meant between FLUKA versions, where instead nothing changed).
Indeed, for 63Cu(p,n) there is a local dip in the FLUKA excitation curve around 6 MeV comparing with the bulk of experimental data we could extract from EXFOR, as per the figure below:
At 6 MeV the (p,a) channel opens up and picks up too much intensity in FLUKA (judging from experimental data) in detriment of (p,n).
However the excess in (p,a) is not enough to make up for the difference with respect to experimental data in the (p,n) channel. Considering that the differences are quite localized in energy, we gratefully acknowledge them for the time being.
Thanks for pointing them out.
With kind regards,
Cesc