Re: [ROOT] TGeoMixture: how to define with the proportion by number of atoms?

From: Andrei Gheata (Andrei.Gheata@cern.ch)
Date: Wed Oct 13 2004 - 18:32:34 MEST


Hi Yuri,

I will implement this and let you know.
Regards,
Andrei

Y. Shitov wrote:

>Hi, ROOT team,
>
>Is it possible to implement GEANT-3 GSMIXT() NLMAT-like option in
>TGeoMixture?
>
>-----------------from GEANT-3 doc----------->
>CALL GSMIXT (IMATE,NAMATE,A,Z,DENS,NLMAT,WMAT*)
>...
>NLMAT -  number of elements in the mixture;
>	 > 0 WMAT contains the proportion by weights of each material in
>		  the mixture;
>	 < 0 WMAT contains the proportion by number of atoms of each kind,
>		  the content of WMAT in output is changed to contain the relative
>		  weights;
>-----------------from GEANT-3 doc----------->
>
>I think it will be suitable to define materials according to its
>chemical formulas like:
>
>TGeoElement* O = new TGeoElement ("O","Oxygen",15.9994,8,);
>TGeoElement* C = new TGeoElement ("C","Carbon",12.0107,6,);
>TGeoElement* H = new TGeoElement ("H","Hydrogen",1.00794,1);
>
>// Mylar wrapper C10H8O4
>TGeoMixture *mat4 = new TGeoMixture("MYLAR",3,dmyl);
>mat4->SetUniqueID(   4);
>mat4->DefineElement(C,-10.);
>mat4->DefineElement(H,-8.);
>mat4->DefineElement(O,-4.);
>
>Best,
>Yuri
>
>
>  
>



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