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Forum: Documentation and Examples
Re: None Moliere's article in English please (Ricardo Pinho)
Re: None Re: Moliere's article in English please (Vladimir IVANTCHENKO )
Date: 20 Aug, 2007
From: Ricardo Pinho <ricardo@lipc.fis.uc.pt>

Hi VI,

First of all, thanks for your answer.

Ok, that makes more sense. Still, only the ICRU_R49 parametrization comes from de ICRU report, in a universal fit segmented in 104 bins of energy. As for the Ziegler1985 parametrization, it's the ZBL universal formula taken straight from Ziegler's 85 book, divided in 2 energy regions. I can only imagine the same applies for the Ziegler1977 parametrization (straight from Ziegler's 77 book). So, they really are 3 "different" approaches to nuclear stopping parametrization, i mean, different equations, different formulae, not only different values of the parameters of the same equations as one is led to imagine by reading the manual. The manual should explain this, and reference the 3 separately. Actually, it should go even deeper and explain that the differences come from different choices of screened Coulomb potentials, and your answer leeds me to believe ICRU chose Moliere's screening function, documented on Ziegler85 (as the Moliere's danish article is impossible to read). By the way, don't you think a reference added for completeness should be in english?! I mean, if you can only choose one, why the unreadable one?!

The same problem happens with the electronic stopping parametrizations. By reading the manual one is led to believe that the different parametrizations simply provide different parameter values for the same equations, printed in the manual, but that is also not the case. The equations varie more or less slightly, and while ICRU_R49p has 5 parameters for each element (actually 4), for example, Ziegler1977p has 12.

I know this questions should be addressed to someone in the Low Energy group, but I still await answers, so, thank you very much VI for replying.

ricardo pinho, LIP-Coimbra

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1 None: Re: Moliere's article in English please   (Maria Grazia Pia - 27 Aug, 2007)
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