Dear Francesco:
> Since the 20MeV proton range in water (around 4mm) is less than your target
> length, the latter is indeed not relevant to the choice of the biasing
> factor for the inelastic scattering length.
> The reduction factor in WHAT(2) has to be set comparing the inelastic scattering length of beam protons in > water (printed in the .out file) and the lenght of your target (after one scattering length - assuming it as > constant along the energy range of interest - about 63% of the beam particles underwent an inelastic > reaction).
Sorry, I may misinterpret the message from your reply
Please let me state what I I understand and correct me.
The inelastic cross section ( around 4.4 m barns for (p,n)) is very
small compare to electronic interaction.
Most of the proton didn't undergo inelastic scattering, but electronic
interaction.
>From the output , the inelastic scattering length of water is 56cm.
So if want to increase the interaction probability of inelastic
scattering, I set the biasing factor for inelastic interaction like
0.01, the inelastic scattering length became 0.56cm.
In the other way ,
I knew the 20MeV proton range in water (around 4mm) is less than target.
It seems to me that biasing is not so necessary.
The two confuses me.
Lee
Received on Wed Dec 03 2008 - 15:49:17 CET
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