Re: elastic scattering length for

From: Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
Date: Mon, 12 Jul 2010 19:02:45 +0200

Dear Helmut,

those huge values, irrespective of their ratios, simply mean that elastic
scattering does not take place in any material for ions, since it is not
implemented

Cheers

Francesco

**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854

On Mon, 12 Jul 2010, Helmut Vincke wrote:

> Dear FLUKA experts
>
> Looking at the FLUKA output of a Carbon-12 ion run (400 MeV/nuc) I find
> the information listed below about scattering lengths. The elastic
> scattering length values appear very high to me (1E30 cm). It looks
> similar to the value FLUKA is reporting for vacuum. The table tells me
> even that vacuum has a shorter elastic scattering length than
> hydrogen!?!?!?!?!
> I guess there is a simple explanation for that. I would be grateful if
> one of you could advice me on that.
> Thanks in advance.
>
> Best regards
> Helmut
>
>
> Material Atomic Atomic Density Inelastic Elastic Radiation Inelastic
> Number&Name Number Weight Scattering Scattering Length Scattering
> Length for Length for Length for
>
> 2 VACUUM 0.000 0.000 0.000 0.1000E+31 0.1000E+31 0.1000E+31 0.1000E+31
> 3 HYDROGEN 1.000 1.008 0.8370E-04 0.8589E+05 0.1195E+35 0.7532E+06 0.6523E+09
> 6 CARBON 6.000 12.01 2.000 12.91 0.5000E+30 21.35 18.23
> 32 WATER 3.333 6.005 1.000 21.88 0.1000E+31 36.08 45.12
> 33 CO 7.000 14.01 1.000 27.78 0.1000E+31 37.42 38.44
> 34 CO2 7.333 14.67 1.000 28.37 0.1000E+31 36.20 39.02
> 35 CH4 2.000 3.208 1.000 15.63 0.1000E+31 46.47 48.70
>
>
>
Received on Tue Jul 13 2010 - 13:54:30 CEST

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