International Atomic Energy Agency The IAEA’s Commitment to Nuclear Structure and Decay Data...

International Atomic Energy Agency


The IAEA’s Commitment to Nuclear Structure and Decay Data

Paraskevi (Vivian) Demetriou

Nuclear Data Section,

Division of Physical and Chemical Sciences,

Department of Nuclear Sciences and Applications,

IAEA, Vienna, Austria


Outline

• Introduction to NDS/IAEA• Nuclear Structure & Decay

- Live Chart of Nuclides

- Nuclear Structure & Decay Network

- Evaluations – Contracts

- ICTP Workshop • Beta-Delayed Neutron Emission

- NEW CRP 2013-2017- Objectives & Outputs

• Summary

P. Demetriou, DDEP Meeting, Paris 8 Oct. 2012



• Mandate to promote and support the safe, secure and peaceful application of nuclear technologies through

- Coordinated Research Projects

- Technical Cooperation Projects


Individual research in labs

Distribution to several labs, testing and

validation of research

Results published. Networking and

proven technologies ready to be transferred

Technical cooperation project to assist in the transfer of technology

Dissemination of technology to Member

States and socio-economic impact


Coordinated Research Projects

• An important IAEA mechanism for organizing international research work to achieve specific research objectives

• Bring together researchers in both developing and developed countries to address a problem of common interest

• Not only further knowledge but improve research capacity in Member States (MS)

• Results are available, free of charge to scientists, and other users from all MS



CRPs cont’d• CRPs are initiated by IAEA scientific experts following advice and

suggestions of “consultants” who participate in a Consultant’s Meeting

• A proposal is formed and submitted for approval to the Committee for Coordinated Research Activities

• After approval a Project Officer is designated and a call for research contracts and agreement proposals follows

• Once the evaluation and selection of proposals is completed the IAEA PO collaborates with Chief Scientific Investigators from the different research institutes involved in order to develop and manage the research programme

• Duration is normally 3 to 5 years


International Atomic Energy AgencyP. Demetriou, DDEP Meeting, Paris 8 Oct. 2012


Departments/Divisions



Nuclear Data Section

• responsible for undertaking Agency activities in the related areas of the development and dissemination of atomic and nuclear data for applications. Scientists in developing countries are assisted in their evolution of local capabilities for the generation and application of atomic and nuclear data through an active programme of technology transfer activities which include

-Data compilation and evaluation

-Data services, Data Networks and User Support

(documents, CDs)

-Nuclear Data Standards and Evaluation Methods



Nuclear Data

• energy-dependent reaction probabilities (cross sections)

• energy and angular distributions of reaction products

for many combinations of target and projectile

• atomic and nuclear properties of excited states

• nuclear structure and radioactive decay data



Nuclear Data Section


Nuclear Data Services

Unit

Nuclear Data Development Unit Atomic & Molecular Data

Unit S. SimakovUnit Head(21717) V. ZerkinSoftware Engineer(21714) V. SemkovaNuclear Physicist(21727) N. OtsukaNuclear Data Physicist(21715) J. RobertsNuclear Data Services Assistant(21725) A. OechsClerk(21716)

D.H. Abriola Unit Head(21712) R. Capote NoyNuclear Physicist(21713) P. DimitriouNuclear Physicist(21708) K. NathaniClerk(21711)

B.J. Braams Unit Head(21731) W.M. Costello (IT Systems Analyst)

(21724) H.-K. ChungAtomic Physicist(21729) Marco Verpelli Systems Analyst/Programmer(21723) K. SheikhDatabase Assistant(21730) A. VasarosIT Systems Engineer (temp.)(21724)

Organization Chart (September 2012)

Section Head: R.A. Forrest Deputy Section Head: D. AbriolaNuclear Data Physicist Nuclear Data Physicist(21709/21710) (21712/21711)Section Secretary: L. Vrapcenjak (21710)


Nuclear Data Services Webpage



Nuclear Database: Live Chart of Nuclides



Nuclear Structure and Decay

• Nuclear Structure & Decay Data Network (NSDD)

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.

Data include:

-bibliographic information: Nuclear Science References (NSR) -evaluated numerical data: Evaluated Nuclear Structure Data File (ENSDF)

Evaluated nuclear quantities: 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.



NSDD cont’d

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).

IAEA support: Individual Contracts to scientists from developing countries to undertake a specific evaluation project (currently 8).



NSDD Network(http://www-nds.iaea.org/nsdd)

• NSDD Annual Meetings (supported by IAEA)

Upcoming: We plan to hold the 20th Network meeting of the NSDD network at the Kuwait Nuclear Data Center, Physics Department, Kuwait University, Kuwait, from 27-31 January 2013.

• Biennial Workshops on "Nuclear Structure and Decay Data: Theory and Evaluation"

organized jointly with the International Centre for Theoretical Physics (ICTP) in Trieste, Italy. Recent ICTP Workshop was held from 6 to 12 August 2012.

OUTCOME: Evaluation of the 211 mass chain (to be submitted to Nuclear Data Sheets, B. Singh)



NDS CRP’s



CRP’s cont’d

• Upcoming:

- Intermediate Cross Section and Decay Data for Medical

Applications (2012-2016)

- Reference Database for Beta-Delayed Neutron Emission

(2013-2017)



Beta-Delayed Neutron Emission


Important nuclear structure informationt1/2(AZ+1): sensitive to low-lying b-strength

Pn : sensitive to b-strength above Sn

Sn

Sn< Qb




Energy production:Pn determines the delayed neutron fraction eff : important in reactor kinetics

137I

87Br

88Br


Beta-delayed neutron emission evaluation

“Significant differences, on the order of a factor of two to four , have been observed in the decay constants for the short-lived delayed precursor groups between ENDF/B-VII and other published values (e.g., Keepin, ENDF/B-VI)...” Pg.2950

NDS 112,2887, December 2011 Special Issue on ENDF/B-VII.1 Library

“…While a detailed analysis on delayed neutron precursors should be performed, present resources are such that the most favorable short-term solution is to revert to the ENDF/B-VI 6-group delayed data….” Pg.2951



Nuclear Astrophysics:Far from the stability, -delayed neutron emission becomes the dominant decay process. Pn provides the only nuclear structure information

Moeller et al., PRC67(03)055802

β-n, -2n,-3n



• NEW CRP: Reference Database of Beta-Delayed Neutron Emission Data (2013-2017)

Project Officer: Daniel Abriola, Secondary Officer: P. Demetriou

- Consultants Meeting: 10-12 Oct. 2011 (IAEA)

→Summary Report




• Beta-delayed neutrons are important for energy production, astrophysics and nuclear theory

• New experimental facilities (GSI, GANIL, JYFL, RIKEN, TRIUMF) are available which will be able to produce new precursors in the neutron-rich region

• Since the last evaluation in 1993 (Rudstam et al., ADNDT 53, p. 1) and the last compilation in 2002 (Pfeiffer et al., Prog. Nucl. Energy 41, p.39) progress has been made in the production/identification of delayed neutron precursors

• Over 60 papers have been published which are not yet included in any database

• There is no database that compiles all relevant data




• NEW CRP: Reference Database of Beta-Delayed Neutron Emission Data (2013-2017)

Project Officer: Daniel Abriola, Secondary Officer: P. Demetriou

- Consultants Meeting: 10-12 Oct. 2011 (IAEA)

→Summary Report - Proposal submitted to CCRA: 10 Aug. 2012

→Approved: 29 Aug. 2012- Call for proposals for Contracts (4) & Agreements (10) (open)

→Evaluated and signed

- 1st Research Coordination Meeting: Aug. 2013



Summary

• NDS/IAEA committed to coordinated effort on compilation and evaluation of nuclear structure and decay data through

- coordination of NSDD network (http://www-nds.iaea.org/nsdd)

- financing individual contracts for evaluators

- supporting ICTP Workshops on training next

generation of evaluators

- performing ENSDF evaluations

• NEW CRP on Reference Database for Beta-Delayed Neutron Emission 2013-2017 (http://www-nds.iaea.org/beta-delayed-neutron)

• Live Chart of Nuclides 2.6 → extended to include Decay Data and in future XUNDL information as well


http://www-nds.iaea.org/beta-delayed-neutron


Thank you for your Attention!


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