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Question Radioactive decay - isomers... 

Forum: Hadronic Processes
Date: 13 Jun, 2012
From: Michael <Michael>

Hi,

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?

Thoughts?

Cheers,

Mike.

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1 None: Re: Radioactive decay - isomers...   (Michael Rubery - 13 Jun, 2012)
2 None: Re: Radioactive decay - isomers...   (Dennis H. Wright - 13 Jun, 2012)
1 None: Re: Radioactive decay - isomers...   (michel maire - 14 Jun, 2012)
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