Problem 882

Summary: atomic deexcitation after radioactive decay - data for a new element are requested?
Product: Geant4 Reporter: vgolovko
Component: processes/hadronicAssignee: Maria.Grazia.Pia
Status: CLOSED INVALID    
Severity: normal    
Priority: P2    
Version: 8.1   
Hardware: PC   
OS: Linux   

Description vgolovko 2006-08-15 15:19:32 CEST 
Hello all,
I simulated a radioactive decay of carbon-10 in scintillating beta-detector.
However, the program is crashed when it was looking for fluorescence or Auger
process for material with Z=5 (boron). See below.
-------------------------------------
---> End of event: 10000
G4AtomicTransitionMagare warning: No fluorescence or Auger for Z=5
Absorbed enrgy deposited locally
G4AtomicTransitionMagare warning: No fluorescence or Auger for Z=5
Absorbed enrgy deposited locally

 *** Break *** segmentation violation
--------------------------------------
Reading the GEANT4 Hypernews forum I have noted that similar problem has been
reported by Dr. Igor Pshenichnov. As one of possible solution it has been
suggested by Fan Lei that the G4AtomicDeexcitation process is only activated for
elements existing in the material table, i.e. is was design for deexcitation of
the target atoms in mind. So, I added material boron to the list of the material
in my detector (however I do not use it in my geometry).
--------------------------------------
 Material:    Boron     density:  2.340 g/cm3   temperature: 273.15 K  pressure:
  1.00 atm  RadLength:  22.516 cm
   --->  Element: B (B)   Z =  5.0   N =  10.8   A =  10.81 g/mole
   --->  Isotope:     B   Z =  5   N =  10   A =  10.01 g/mole   abundance:  19.90 %
   --->  Isotope:     B   Z =  5   N =  11   A =  11.01 g/mole   abundance:
80.10 %  ElmMassFraction: 100.00 %  ElmAbundance 100.00 %

--------------------------------------
The problem still remains, as GEANT crashes with the same message.
Could you please look into this problem?
Best wishes,
Victor Golovko.
August 15, 2006
Comment 1 dennis.herbert.wright 2007-02-26 17:47:59 CET 
Although the problem starts with radioactive decay, it seems to have its roots
in the atomic de-excitation code, which is within the low energy electromagnetic
category.   I am referring it to the Low Energy EM coordinator who is more
qualified to examine it.
Comment 2 Maria.Grazia.Pia 2007-02-27 00:28:59 CET 
Geant4 Atomic Relaxation handles elements with 5<Z<101; this is the same range
of atomic numbers covered by the EADL data library, on which the model is based.
These are the elements for which there are data for both the shell binding
energies (necessary to calculate the energy of the relaxation products) and the
transition probabilities from any atomic vacancy. All this is explained in the
documentation.
The Atomic Relaxation package should be used within its documented limits of
validity.

Best wishes,
Maria Grazia Pia