|Message: Re: Superheavy nuclei||Not Logged In (login)|
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> Hi Forum people, I have a question regarding your RadioactiveDecay and > PhotoEvaporation files. > > The thing is I am working on superheavy nuclei. They start with proton > number z=102, i.e. just above what is included in your > RadioactiveDecay3.3 and PhotoEvaporation2.1 libraries.
By default in G4RadioactiveDecay only ion with Z up to 100 will be treated even if you add file for Z>100 isotope in the radioactive decay database. To change that limit you can use the macro command
/grdm/nucleusLimits or change that in the C++ physics lists level with G4RadioactiveDecay::SetNucleusLimits() but I would recommand to do that rather at the macro command level.
> > To explore different hypotheses regarding the decay of these nuclei > (which are notoriously hard to study) I would like to use a data file > and simulate different ways to decay. Thus, ideally I would like to make > up a file for nucleus z10X.aXXX. This file should then be editable to > simulate for example different alpha energies or the order and intensity > of the subsequent gamma rays. > > I tried to do so but ran into various problems. > > 1a) When I make up a file with a new name the program does not want to > accept it.I guess that it is because you did not put the Z and A limit higher as suggested above. Did you set your file in the correct database directory?
>Do I need to have produced the file already before compiling? > It seems like there's no problem to take a already existing file (like > z55.a131) and modify the decay in RadioactiveDecay3.3 (furthermore I > have changed z54.a131 to simulate the nucleus decaying into an excited > state in the daughter nucleus thus emitting gamma rays). 1b) Is there > any way to only recompile the RadioactiveDecay3.3 and > PhotoEvaporation2.1 libraries or do I need to wait though the whole 2h > compilation process when I want to add a new file?
No no! Database files area loaded at run level. So it is not a a compilation issue.
> > 2a) I've been trying to find out the format of the data files in order > to understand what I am actually simulating. Are there any documentation > of this? The PhotoEvaporation2.1 have 17 input columns for each gamma > ray and the RadioactiveDecay3.3 have 4 columns and a number of rows for > each nucleus. Some of the numbers in the files are easy to understand > and some are not clear to me at all.
I have no time to discuss the format of the Radiactive decay file now. I will try to do that later next week but to have a first idea you may look at the method G4RadioactiveDecay::LoadDecayTable where these files are read. lines 624-974 from G4RadioactiveDecay.cc
> > 3b) Are you aware of if there are any (unofficial) data files around > which includes the decay of the superheavy elements? It is always easier > not to start from scratch!
Not that I know!
> > I would be very happy for some help and advice in this matter! Thanks, > Lisa >
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