| Geant4 Cross Reference |
1
2 This README file provides instructions for rea
3 schemes in the files zXX.aYYY found in the dir
4 (most recent version). This directory, as wel
5 available from the Geant4 download page
6
7 http://cern.ch/geant4/support/download.shtml
8
9 under the Data files heading. In order to use
10 correctly, you must download and unpack the ab
11 area, and set the environment variable
12
13 G4RADIOACTIVEDATA
14
15 to point to it.
16
17 **********************************************
18 In each of the files, lines beginning with '#'
19
20 Lines beginning with a 'P' are headers, indica
21 nucleus which may be parent nuclei for further
22 the excitation energy in keV, followed by a ch
23 level. If this is "-", the level is assumed t
24 +X, +Y, +Z, +W, +U or +V, the level is floatin
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.
44
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 **********************************************
51