Re: Cu64 production

From: Alfredo Ferrari (alfredo.ferrari@cern.ch)
Date: Wed Jan 25 2006 - 14:22:12 CET

  • Next message: Burge, F \(Frances\): "gases at non-atmospheric pressure"

    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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