From: Alfredo Ferrari (alfredo.ferrari@cern.ch)
Date: Wed Jan 25 2006 - 14:22:12 CET
Dear Yann
you set the atomic weight to 64, but you didn't set the isotopic
composition to 64 as well, so you got natural Nickel isotopic composition
where 64-Ni is only 0.9% but with a (somewhat nonsense) atomic weight of
64. Set the what(6) of the material card to 64 and it will be fixed,
however you'll not get a factor 1000 more but rather
something 100 more. Looking around for exp data (for 64-Ni(p,n)64-Cu)
I found a value of 220 mb at 14.8 MeV (the code predicts 135 mb with some
variations around depending on the evaporation settings, level densities
etc), 650 mb at 11.9 MeV (the code predicts around 520 mb again +/-
some tens of mb depending on options), 800 mb at 10 MeV (the code
predicts 680 mb) etc.
These are still reasonable values even though such very low energies (for
FLUKA) are somewhat at the limit of its models (you probably can get nice
results out of GNASH or other "low" energy dedicated nuclear models).
The data I have stop at 14.8, the next point is 130 MeV where the exp
number is 6.1 mb and FLUKA predicts 8 mb.
I hope I answered your question!!
Ciao
Alfredo
On Wed, 25 Jan 2006, foucher wrote:
> Dear Fluka users,
>
> It's a long time ago that I have not used fluka.
> I want to calculate the activity of 64Cu induced by 18 MeV protn on a Ni64
> target (360 micron)
> thickness.
> I use the RESNUCLE card in order to get the production of Cu64.
> The result is 4.7E-6 Atom/p ---> A = 4.33E-5 mCi/(MicroA.h).
> The results is far below what I'm expecting (1000 times higher).
> Is my input file correct ?
> If yes where is the problem ?
> Thanks in advance
>
> Yann
>
>
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