INTERNATIONAL NETWORK OF NUCLEAR STRUCTURE AND DECAY DATA EVALUATORS (NSDD)

The NSDD Network

The International Network of Nuclear Structure and Decay Data (NSDD) is an international team of experts who provide recommended nuclear structure and decay data to be used in basic and applied research. These data include:

Evaluated nuclear quantities include the following: disintegration energies, radiation and transition probabilities, nuclear level schemes, excitation energies, half-lives, decay modes, spin-parity values, magnetic and electric multipole moments, and nuclear band structure. The NSDD network was established in 1974 under the auspices of the International Atomic Energy Agency (IAEA), and includes 18 data centres and groups located in laboratories, institutes and universities within 10 countries. Network scientists evaluate nuclear structure and decay data for all isotopes on an agreed basis; they also compile the most recent experimental results in the Unevaluated Nuclear Data Library (XUNDL). NSDD databases contain these data in computerised format and are available both online and offline. These evaluations are also published in the journals Nuclear Physics A and Nuclear Data Sheets. The NSDD Network welcomes participation from other groups interested in contributing to this activity.

Meetings

Meetings of the International Network of Nuclear Structure and Decay Data Evaluators (NSDD) are coordinated by the IAEA, while staff at Brookhaven National Laboratory, USA, are responsible for both the technical and database issues. NSDD members meet biennially (once every two years) to discuss the current status of the mass chain evaluations, evaluation responsibilities, and processing code needs, as well as ENSDF formats. Priority activities for the subsequent two years are also agreed. These NSDD meetings are held alternatively at the data centres and IAEA Headquarters in Vienna.