|Message: Re: Problems with neutron HP and LEND with Argon interactions||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
Thank you very much for running your test Michel! It allowed me to find my problem and it has nothing to do with problems with argon. Rather, it was how I was defining my material. I had inadvertently set the temperature of my argon to -1K and this was causing the problems in both the elastic and inelastic interactions that I was seeing.
If anyone is interested, you can test this by modifying the MaterialWithSingleIsotope method in the DetectorConstruction class of Hadr03 so that the material was defined as such:
G4Material* material = 0; if(name=="Ar40") material = new G4Material(name, density, ncomponents=1, kStateLiquid, -1.0); else material = new G4Material(name, density, ncomponents=1); material->AddElement(element, massfraction=100.*perCent);
The only other changes I made were to turn elastic scatters back on and modify the density of the Argon in the Ar40.mac that Michel attached in his message. The results are attached. As you can see, the elastic scatters produce no recoil Ar40 and the (n,3n) reaction shows up when it shouldn't.
Putting the argon at a reasonable temperature fixed both the elastic and inelastic problems. I wonder if the G4Material class should be doing a check for a negative temperature and throwing an exception if the user attempts to do this?
Your test gave me a benchmark from which to discover the problem. Many thanks!