|Message: Radioactive decay - isomers...||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)|
I'm using the QGSP_BERT_HP physics list together with the ->RegisterPhysics(new G4RadioactivedecayPhysics()) command...
After registering G4RadioactivedecayPhysics I decided to try a simple example of n,2n on Al-27 for 20 MeV neutron. Evaluated cross sections exist for populating the 0+ excited state (which B+ decays in 6.345s) and the 5+ ground state (which B+ decays in 7.1e5yrs together with a ~1.8 MeV gamma). I should see both states populated but only see the ground state...is it using a total cross section but only populating the ground state or is the iomeric final state completely omitted?
I tink the question I'm asking is: does Geant4 handle isomers and metastable excited states following hadronic reactions? With regard to shielding calculations etc this is a pretty important result. For example if I believe the current result I would be led to believe that the aluminium would be ~inert (7.1e5year b+ decay) following 20 MeV bombardment...in reality it would be pretty active due to the 6.345s isomer?
If Geant4 could do this properly it would save me a whole world of pain trying to post process activation data?
|Inline Depth:||Outline Depth:||Add message:|