Evaluated and Compiled Nuclear Structure Data
Dataset Retrieval - Help Page
This site can be used to retrieve evaluated and/or compiled nuclear structure datasets from the NNDC databases. Several options are available for selecting datasets. Data may be retrieved based on nuclide, charge, or mass, or by indexed reaction and decay quantities.
Once a set of datasets matching specified criteria is found, the nuclide and dataset ID string will be listed, along with several retrieval options. The options can apply to selected datasets, or to all datasets from a given database. Individual datasets can be selected using provided checkboxes. Note: If a very large number of datasets are listed, the "get all datasets" option will not appear. In this case the user should use the checkboxes to select particular datasets of interest.
The first dataset retrieval option is a formatted html page containing tables and comments for the dataset. This page will also provide links for the display of level schemes in graphical format. The second option is to download the ENSDF-formatted file. If your browser has a plug-in for type "application/ensdf" (i.e., Isotope Explorer), it will recognize the data in this format. The third choice displays the ENSDF file in plain text form in the browser.
In addition, for each dataset there is an option to retrieve a list of references quoted in the dataset.
For many of the search options, you will be asked to specify which "types" of dataset you want to retrieve. There are five types of dataset in the database: Comments, Reference, Adopted, Decay, and Reaction. The first three apply only to evaluated data. Adopted data contains the "recommended" values for nuclear structure quantities, as established by the evaluator. Reaction and Decay datasets contain data associated with specific reaction and decay measurements. Note that Adopted, Reaction, and Decay datasets are always associated with a specific nuclide, while Comment and Reference datasets are usually associated with an entire mass chain.
This page can be used to browse the datasets by charge or mass.
This form can be used to find datasets for a particular nuclide, or for all nuclides with a given mass or atomic number. Z can be entered as an element symbol or as a numeric value, and A should be entered as a numeric value. Nuclides should be entered in the form "AAAZZ" or "ZZ-AAA" (i.e. 44TI or TI-44). Retrievals are not case-sensitive (TI=ti=Ti). The exception to this is "n" vs. "N". In this case, "n" refers to neutron, whereas "N" refers to nitrogen.
For nuclides with Z>111, use the number (Z-100) as the element symbol in nuclide retrievals. For instance, for Z=112, A=281, the nuclide can be entered as "28112" or "12-281".
This form can be used to select decay datasets based on decay-related quantities. The Z- and A-range inputs can be used to restrict the area of intrest on the chart of nuclides. The "parent" input can be used to specify the decay parent. Finally, the specific type of decay can be chosen from the drop-down list.
This form can be used to select reaction datasets based on reaction-related quantities. The Z- and A-range inputs can be used to restrict the area of intrest on the chart of nuclides. A reaction can be specified - it should be entered as it appears in the dataset ID string (though parentheses are optional). Target and residual nuclides can be specified (in some cases, the residual may be different than the nuclide being studied). Incident and outgoing particles can be specified (A = alpha, P = proton, etc.). Finally, a specific reaction-related "subject", such as "stripping" or "Coulomb excitation", can be specified.
This page can be used to retrieve all datasets which have been added or modified since the specified date. Dates up to one year before the present can be specified.
The ENSDF and XUNDL indices provide information on the contents of the respective databases. For ENSDF, literature cut-off dates and publication information are given.