Jag TuliTown Meeting

Helsinki, September 19, 07

International Network of Nuclear Structure and Decay Data Evaluators :

Need for European participation

Jagdish Tuli*National Nuclear Data Center

Brookhaven National Laboratory

*Email: Tuli@bnl.gov

Brookhaven Science Associates

Jag TuliTown Meeting

Helsinki, September 19, 07

International Network of Nuclear Structure and Decay Data Evaluators

• It’s mission

• ENSDF

• Its Status, contributors, and users

• International effort and support

Jag TuliTown Meeting

Helsinki, September 19, 07

International Network of Nuclear Structure and Decay Data Evaluators

• Multinational team of nuclear structure and decay data evaluators coordinated by the IAEA

• In existence since 1974

• Biennial meetings held under the auspices of the IAEA

• Maintain and update ENSDF (Evaluated Nuclear Structure Data File)

Master database held at NNDC, BNL, USA

• Available through various media: Web, Publications

Jag TuliTown Meeting

Helsinki, September 19, 07

Contents: Evaluated nuclear structure and decay data for all known (>3000 ) nuclei, organized into over 294 mass chains

ENSDF

ENSDF - www.nndc.bnl.gov/ensdf

Decay data-

++

-netc.

Reaction data(HI,xn)

(p,p')(n,), (n,xn)Coulomb Exc.(,'), (,xn)

(d,p), etc.

Adopted databest values

Levels:E, J, T1/2, , Q, configurations

Gammas:E, BR, M, , ICC

ENSDF

Jag TuliTown Meeting

Helsinki, September 19, 07

ENSDF

Special (horizontal) evaluations that are needed by

the nuclear structure community, e.g., logft values, α- and p-decay properties, SD and magnetic rotation bands, nuclear isomers, properties of nuclei far from the line of stability, heavy and super-heavy nuclei, etc.

Evaluation of decay data for nuclides that are important to various applications, e.g., in reactor calculations, homeland security, medicine, detector calibrations, nuclear waste, etc.

Jag TuliTown Meeting

Helsinki, September 19, 07

ENSDF: Major Data Sources and Derivatives

ENSDF

Atomic Masses

(Wapstra & Audi)

Nuclear Science References (NSR)

MIRD

Contributing Databases:

Derivative Databases:

Derivative Publications:

RADWARE

MC Codes MCNPX GEANT

NUBASE RIPL

NuDat2IEORTEC & CANBERRA

JANIS …

Jag TuliTown Meeting

Helsinki, September 19, 07

International contributions to ENSDF

• Sole source of funding: US/DOE Office of Science

• DOE is concerned about lack of non-US contributions to ENSDF

Jag TuliTown Meeting

Helsinki, September 19, 07

Structure and Decay Data Evaluation for ENSDF

An international effort is needed to sustain this vital resource, used worldwide.

An increasingly large fraction of evaluation effort now comes from US and Canada.

0

50

100

150

200

250

300

350

400

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

Year

Pu

blis

hed

Nu

clid

e E

valu

atio

ns

OthersEuropeUS+Canada

US+Canada

2002-61997-011992-61987-911982-60

10

2030

40

50

60

7080

90

100

Time Period

% C

on

trib

uti

on

EuropeOthers

Jag TuliTown Meeting

Helsinki, September 19, 07

Usage

US+Canada: 44%

Europe: 26%

Japan: 6 %

China: 4 %

Former: USSR 3 %

India: 3%

Structure and Decay Data Evaluation for ENSDF

Usage of data geographically (source: US National Nuclear Data Center, 2005)

There is dramatic disparity between contribution to and usage of final product

Contribution (2002-2006 average)

US+Canada: ~78%

Europe: ~9%

Japan: ~5%

Jag TuliTown Meeting

Helsinki, September 19, 07

Numbers of participating Laboratories/Institutes in ENSDF evaluations

Year1981 1986 1996 2007

N. America 6 6 6 6

Europe 6 5 4 2 → 1 (0)

Russia 2 2 2 1

Japan 1 1 1 1

China - - 1 2

Rest of World 1 1 1 3

16 15 15 14 (13)

Jag TuliTown Meeting

Helsinki, September 19, 07

Structure and Decay Data Evaluation for ENSDF

European Effort (1986 to present):

Dramatic erosion of prior European support:

• Out of the 6 European structure data centers in 1986, none is currently financially supported.

• Europe is a 26% user of end product but its contribution is disproportionately low (two remaining structure evaluators are retirees and have no financial support).

European Structure

Evaluation Centers

Last published evaluation

Current financial support?

France 2006 No

Belgium 2005 No

Netherlands 1998 No

Sweden 1992 No

Germany 1991 No

UK 1986 No

Jag TuliTown Meeting

Helsinki, September 19, 07

Conclusion

Strong international effort is needed to sustain this vital resource, used worldwide.

European community is a major user of NSDD databases. Their contribution to keep them updated will be greatly appreciated.

Some European groups have expressed interest in this activity.

These groups should be supported.

Jag TuliTown Meeting

Helsinki, September 19, 07

Conclusion

Thanks for allowing me this opportunity

to bring our concerns to your attention.

Thanks for your great hospitality!