Help:Reduced Decay Schemes

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The nuclear data contained in the nuclide boxes is concise due to the very limited space available. In addition, there are a number of rules governing how the data is given in the nuclide box. In order to obtain maximum benefit from the nuclide chart, it is important to know how to interpret the box contents correctly. In the following sections, the contents of the nuclide boxes are explained in detail by considering a number of example nuclides. In addition, reference is made to the nuclide reduced decay scheme in order to relate the box contents with information on energies of emitted particles with the energy levels in the nucleus in the decay scheme diagram. Additional data has been taken from the Nuclear Data Sheets and Nucleonica's Datasheets.

Radiations indicated in the nuclide box are drawn as plain lines in the diagram. To improve understanding, some transitions not mentioned in the box are added and indicated as dotted lines. Corresponding data is also indicated in grey. Radiations with a low emission probability indicated by dots or brackets in the nuclide box are also drawn with dotted lines.

Using the Reduced Decay Schemes Application

The user interface for the Reduced Decay Scheme Application is shown below.

Reduced Decay Schemes: User Interface


In the Summary tab, a list of all nuclides for which Reduced Decay Schemes are available is given together with the atomic number, half-life, and creation / modification date. Additionally, nuclide Reduced Decay Schemes can be downloaded in html format or deleted. At the bottom of the grid, the total number of nuclides for which Reduced Decay Schemes are available is given. A slider control can be used to scroll through the list of nuclides. The grid information can be arranged in ascending/descending order by clicking on the header names (Z, Nuclide, Half-life, and Updated). By default the most recent Reduced Decay Scheme is at the top of the grid list.

Reduced Decay Schemes

When the user clicks on a nuclide listed in the Summary tab, the reduced decay scheme and further information is shown in the Reduced Decay Scheme tab. In the example below, the reduced decay scheme and additional data for the nuclide Ar 41 are shown. The information in the Reduced Decay Scheme tab consists of

  • An extract from the Karlsruhe Nuclide Chart showing the nuclide of interest and its decay products
  • The reduced decay scheme
  • A discussion on how to interpret the data in the nuclide box based on the more detailed information in the reduced decay scheme
  • A high resolution gamma spectrum created using the Gamma Spectrum Generator application in Nucleonica. A larger version of the gamma spectrum image can be obtained by clicking on the "enlarge" link.
Reduced Decay Schemes: Ar 41


The Upload tab is available only to Nucleonica editors for uploading reduced decay schemes and additional data into the application.

Reduced Decay Schemes: Upload


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