| Geant4 Cross Reference |
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<< 1
2 This README file provides instructions for rea << 2 Lines beginning with either a 'W' or a '#' are comments
3 schemes in the files zXX.aYYY found in the dir << 3
4 (most recent version). This directory, as wel << 4 Lines beginning with a 'P' are a header which describes a level of the
5 available from the Geant4 download page
<< 5 nucleus. The first number is the excitation energy in keV, the second is the
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<< 6 half life in seconds
7 http://cern.ch/geant4/support/download.shtml
<< 7 Indented lines under the 'P' lines are decay modes for that
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<< 8 excitation. There are two type of records here, distinguished by the
9 under the Data files heading. In order to use << 9 number of columns.
10 correctly, you must download and unpack the ab << 10
11 area, and set the environment variable
<< 11 If there are 3 columns only, this is a header which describes all
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<< 12 decays of that type from this level.
13 G4RADIOACTIVEDATA
<< 13 The first column is the decay mode, the second column is zero, and the
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<< 14 third column in the branching ratio to this mode, as a fraction of
15 to point to it.
<< 15 unity. Therefore, the third columns of all the 3-column records under
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<< 16 a given 'P' line should sum to 1.0.
17 ********************************************** << 17
18 In each of the files, lines beginning with '#' << 18 If there are four columns, this is a record which describes a subset
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<< 19 of the decay type, specific to a given lower level in the daughter
20 Lines beginning with a 'P' are headers, indica << 20 species. The first column is the decay type, the second column is the
21 nucleus which may be parent nuclei for further << 21 excitation level of the daughter (in keV), and the third column is the
22 the excitation energy in keV, followed by a ch << 22 branching ratio as a percentage (! note... not a fraction of unity) of
23 level. If this is "-", the level is assumed t << 23 the total branching ratio which came from the 3-column record for this
24 +X, +Y, +Z, +W, +U or +V, the level is floatin << 24 decay.
25 following this is the half life in seconds. I <<
26 are decay modes for that excitation. There ar <<
27 distinguished by the number of columns.
<<
28
<<
29 If there are four columns only, this is a head <<
30 of each type of decay from this level. The fi <<
31 the second column is always zero, the third co <<
32 is floating or not, as mentioned above, and th <<
33 branching ratio going through this mode, as a <<
34 the fourth column of all the 4-column records <<
35 to 1.0.
<<
36
<<
37 If there are five columns, this is a record wh <<
38 decay type, specific to a given lower level in <<
39 first column is the decay type, the second and <<
40 level (keV) of the daughter reached after the <<
41 indicator, and the fourth column is the branch <<
42 (! note... not a fraction of unity) of the tot <<
43 from the 4-column record for this decay.
<<
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45 In the case of beta- or beta+ decay, there wil <<
46 describing the "forbiddenness" of the particul <<
47 indicated by the tags firstForbidden, secondFo <<
48 uniqueFirstForbidden, uniqueSecondForbidden, u <<
49 determine the shape of the beta spectrum.
<<
50 ********************************************** <<
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