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None Radioactive decay of moving ions g496p04 versus g1002p01 no threading 

Forum: Hadronic Processes
Date: 02 Jun, 2016
From: <ljungvall@csnsm.in2p3.fr>

Dear all,

We have a simulation where we simulate the decay of excited states in nuclei. In geant4 terms these are called IT (isomeric transitions). However, they are gamma-rays emitted after a finite lifetime (order of ps). To do this in geant496p04 what we usually do is to create a decay file with IT entries that gives the states decaying with a finite lifetime the correct lifetime. Something like

P          286.7   1e-10
                         IT         286.7      100.
P          749.9   1e-11
                         IT         749.9      100.
P          749.9   1e-11
                         IT         749.9      100.

for each states we need to simulate. We then create the ions with the correct excitation energy, i.e. for this example

/gun/ion 72 170 0 749.9

and geant496p04 happily decays this ion with the correct lifetimes.

Now, in geant41002p01 the ions no longer decay unless at rest... I have modified example rdecay01 in geant496p04 and geant41002p01 to show the issue. Included are needed data files and the output of short runs for the two versions with /tracking/verbose 2. Note how for g496p04 we get decays with gamma-rays and conversion electrons but for geant41002p01 the ions happily just fly out of the world volume. You can find the files here

https://owncloud.csnsm.in2p3.fr/index.php/s/xDT2a5Avm47RShy

Any ideas?

kind regards

Joa

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1 None: Re: Radioactive decay of moving ions g496p04 versus g1002p01 no threading   (michel maire - 05 Jun, 2016)
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