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Geant4/processes/hadronic/models/de_excitation/photon_evaporation/README-LevelGammaData

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  1 
  2 The photo-evaporation database contains nuclear deexcitation data starting 
  3 from a given nuclear level. Each file contains data for a given isotope, 
  4 identified by Z and A.
  5 
  6 The database must first be downloaded from
  7 
  8 http://geant4.web.cern.ch/geant4/support/download.shtml
  9 
 10 and stored in a local directory.  The environment variable 
 11 G4LEVELGAMMADATA must then be set to point to this directory.
 12  
 13 **************************************************
 14 
 15 Each line describes a de-excitation *step* from a given energy level to a lower 
 16 one (which might be the ground state). It contains data for gamma de-excitation
 17 and internal conversion. Notice that if multiple de-excitation 
 18 channels are allowed for the starting energy level, these channels will be 
 19 described in more lines (all having the same starting level).
 20 
 21 
 22 Each line contains 17 columns:
 23 
 24 1) Energy of the starting nuclear level (keV)
 25    As mentioned before, it is possible to have more lines describing the same 
 26    starting level, in the case where multiple de-excitation schemes are
 27    allowed.
 28   
 29 2) Energy of the transition (keV)
 30    This is the energy difference between the initial and the final level.
 31 
 32 3) Gamma transition probability (Ig in %)
 33    Note1: if the probability is less than  minProbability = 1e-8%, it is forced
 34           to be 1e-8%.
 35    Note2: see column 7 how total branching ratio is computed.   
 36 
 37 4) Polarity 
 38    Spin-parity variation in the transition
 39    [never used in real simulation]
 40 
 41 5) Level half-life (s)
 42 
 43 6) Angular Momentum
 44    Spin of the initial level
 45    [never used in real simulation]
 46 
 47 7) Total internal conversion coefficient : alpha = Ic/Ig
 48    Note1: total transition is the sum of gamma de-excitation and internal
 49           conversion. Therefore total branching ratio is proportional to 
 50     (1+alpha)*Ig
 51    Note2: total branching ratios from a given level do not always sum up to 
 52     100%. They are re-normalized internally.    
 53    Note3: relative probabilities for gamma de-excitation and internal conversion
 54           are 1/(1+alpha) and alpha/(1+alpha) respectively
 55 
 56 8-17) Partial conversion probabilities for
 57   K-shell
 58   L1-3 shells
 59   M1-5 shells
 60   Outer shells (shellID = 9 is used, when applicable)
 61 
 62 Note: if the nuclear excitation energy does not match any of the known levels,
 63       the *nearest* level is always considered.  In G4RadioactiveDecay, 
 64       metastable states are treated correctly if the excitation energy is 
 65       within 2.0 keV of the values in $G4RADIOACTIVEDATA.
 66 
 67       For instance: take file $G4LEVELGAMMADATA/z28.a60 (Ni-60)
 68       Co-60 radioactive decay populates the 1332.5080-keV level of 
 69       Ni-60 (0.12%) or the 2505.7480-keV level of Ni-60 (99.88%).
 70 
 71       Deexcitation from the 2505.7480-keV level is described in lines 
 72       6-8 of $G4LEVELGAMMADATA/z28.a60 (Ni-60)
 73       Here, internal conversion coefficients are negligeable (column 7)
 74       Therefore the nucleus will release
 75       1) 347 keV with 7.6e-3% probability, ending up in the 2158-keV level 
 76       (following de-excitation hence takes place, lines 2-4 of the file)
 77       2) 1173 keV with 100% probability, ending up in the 1332-keV 
 78       excited state (following de-excitation hence takes place, line 1)
 79       3) 2505 keV with 2e-6% probability ending up in the ground state.
 80 
 81