Gabriele Cosmo
39 lines
1.8 KiB
Plaintext
39 lines
1.8 KiB
Plaintext
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This README file provides instructions for reading the radioactive decay
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schemes in the files zXX.aYYY found in the directory RadioactiveDecay3.2
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(most recent version). This directory, as well as previous versions, is
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available from the Geant4 download page
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http://geant4.web.cern.ch/geant4/support/download.shtml
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under the Data files heading. In order to use the radioactive decay module
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correctly, you must download and unpack the above directory in your local
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area, and set the environment variable
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G4RADIOACTIVEDATA
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to point to it.
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**************************************************************************
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In each of the files, lines beginning with either a 'W' or a '#' are
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comments.
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Lines beginning with a 'P' are headers, each of which describes a level of
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the nucleus. The first number is the excitation energy in keV, the second
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is the half life in seconds. Indented lines under the 'P' lines are decay
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modes for that excitation. There are two type of records here,
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distinguished by the number of columns.
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If there are 3 columns only, this is a header which describes all decays of
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that type from this level. The first column is the decay mode, the second
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column is zero, and the third column in the branching ratio to this mode,
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as a fraction of unity. Therefore, the third columns of all the 3-column
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records under a given 'P' line should sum to 1.0.
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If there are four columns, this is a record which describes a subset of the
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decay type, specific to a given lower level in the daughter species. The
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first column is the decay type, the second column is the excitation level
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of the daughter (in keV), and the third column is the branching ratio as a
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percentage (! note... not a fraction of unity) of the total branching ratio
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which came from the 3-column record for this decay.
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