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NNDC Data Services

This overview provides insight into the evaluation and dissemination activities of the US Nuclear Data Program (USNDP), including the international collaboration, major products, and access methods. It showcases the US contribution to structure evaluation, responsible for two-thirds of the known nuclides, and highlights the geographical distribution of NNDC users. Major products such as the Evaluated Nuclear Structure Data File (ENSDF) and Experimental Unevaluated Data List (XUNDL) are discussed. The article also covers the purpose and contents of the XUNDL Database and its coordination. Access to ENSDF data and other derivative databases is explained, along with electronic access to nuclear physics databases and web statistics.

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NNDC Data Services

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  1. NNDC Data Services NNDC Data Services NNDC Data Services Jagdish K. Tuli National Nuclear Data Center Brookhaven National Laboratory Upton, NY 11973

  2. Overview of US Nuclear Data Program’s nuclear structure and decay data activities • Content: • How do our evaluation and dissemination activities fit into the global picture? • Who is involved? • What are the major products? • How can our products be accessed? • Other activities

  3. The International Connection The US structure and decay data evaluation effort is part of an international effort coordinated by the IAEA via two-yearly Advisory Group meetings Long-Term Non-US Emerging Non-US Contributors: Contributors: BELGIUM ARGENTINA CANADA AUSTRALIA CHINA BRAZIL FRANCE BULGARIA JAPAN INDIA KUWAIT RUSSIA

  4. Structure Evaluation Responsibilities The US contribution is a very significant one Responsible for two thirds of the known ~2900 nuclides. However, there is an extremely important international component to the overall structure evaluation effort!

  5. US Network (~6 FTE) (US-DOE Office of Science funded) USNDP Evaluators – Who Are We? ANL BNL INEEL LBNL ORNL McMASTER TUNL

  6. NNDC Web Portal

  7. Geographical Distribution of NNDC Users in 2004 • USA - 41.87% • EU - 25.72% • Japan - 6.06% • China - 3.75% • Former USSR - 3.28% • India - 3.13% • Canada - 2.47% • Korea - 1.09% • Australia - 0.78% • Brazil - 0.77% • The rest- 4.14% • Unresolved - 6.94%

  8. Our Major Products Evaluated (or compiled) structure & decay data, A=1-294, and the means to access them • PRINCIPAL DATABASES …. • Web accessible from NNDC or mirror sites; http://www.nndc.bnl.gov. • NSR - Nuclear Science References (bibliographic). • ENSDF - Evaluated Nuclear Structure Data File; comprehensive, peer reviewed, publicly available; the primary data source for other special purpose databases and the starting point for several major publications. • XUNDL – Experimental Unevaluated Data List compiled from recently published literature; primarily high-J papers.

  9. ENSDF Database: Major Contributors and Derivatives Atomic Masses (Audi, Wapstra) Nuclear Science References (NSR) XUNDL Compilation Contributing Databases: ENSDF Derivative Databases: NuDat MIRD RADWARE Hi-J Nuclear Data Sheets (Elsevier) Table of Isotopes (1996-9) Table of Radioactive Isotopes (1986) Derivative Publications: (value added) Table of Super -deformed Bands Nuclear Wallet Cards

  10. ENSDF Database Structure ENSDF .... …. A=1 A=294 A .... …. Abs Zmin Z Zmax Ref Adopted (best values) Q values Levels: (E, J, T1/2, , Q, config, excitn.) Gammas: (E, Br, Mult, ) Reactions (HI,xn) (p,p’ ) (n, ) Coul. Exc. (,’) (d,p) etc. Decays - ++  -n etc. 0 to ~6 datasets 1 dataset 0 to ~40 datasets

  11. Access to ENSDF data Segment of Index to ENSDF; choose A or nuclide of interest

  12. Choose Dataset(s), Output option

  13. HTML output for 184Bi “Adopted”

  14. XUNDL Database • Purpose: To provide rapid access to formatted (manipulable) data from the latest papers - in response to request from high-spin physics researchers. • Contents: Compiled (unevaluated) data from recent publications, primarily in high-spin physics. Currently contains material for: • 916 nuclides (A=13-288; N - element 115) • 1326 papers • Coordination: B. Singh (McMaster). • Updates: as datasets arrive at NNDC (D. Winchell - BNL) • Manpower: primarily, carefully trained and closely supervised undergraduate students. • Data Input: often, data input can be done directly from publication using FINEREADER commercial software.

  15. Major products for which ENSDF is primary source NuDat: recommended level and gamma properties (ENSDF Adopted Levels, Gammas) WWW Table of Nuclear Structure: website providing alternative interface to ENSDF Adopted Levels, Gammas MIRD: Medical internal radiation dose from radionuclides Wallet Cards: ground and isomeric state properties RADWARE Hi-Spin Database: database providing ENSDF and XUNDL datasets for in-beam gamma-ray studies in RADWARE file format

  16. NuDat Database

  17. Choose: Hg

  18. Bibliographic data Evaluated data Journal prep’n Nuclear Structure Data

  19. Electronic access to nuclear physics data bases, computer codes and documents available since 1986. Electronic Access to Nuclear Data

  20. 2004 Web Statistics • Portal was launched on April 19, 2004 • Number of retrievals went from 338K in 2003 to 560K in 2004, 66% calendar year increase • Number of database retrievals increased two-folds with a new portal • Migration + User Interface • improvements produce results

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