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
International Atomic Energy Agency
Outline
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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
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International Atomic Energy Agency
International Atomic Energy Agency
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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
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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
International Atomic Energy Agency
Coordinated Research Projects
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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
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International Atomic Energy Agency
CRPs cont’d
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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
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Oct. 2012
International Atomic Energy Agency
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International Atomic Energy Agency
Departments/Divisions
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International Atomic Energy Agency
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International Atomic Energy Agency
Nuclear Data Section
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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
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International Atomic Energy Agency
Nuclear Data
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energy-dependent reaction probabilities (cross sections)
energy and angular distributions of reaction products
for many combinations of target and projectile
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atomic and nuclear properties of excited states
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nuclear structure and radioactive decay data
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International Atomic Energy Agency
Nuclear Data Section
Organization Chart (September 2012)
Section Head: R.A. Forrest
Deputy Section Head: D. Abriola
Nuclear Data Physicist
(21709/21710)
Nuclear Data Physicist
(21712/21711)
Section Secretary: L. Vrapcenjak
(21710)
Nuclear Data Services
Nuclear Data Development Unit
Atomic & Molecular Data
Unit
Unit
S. Simakov
D.H. Abriola
B.J. Braams
Unit Head
(21717)
Unit Head
(21712)
Unit Head
(21731)
V. Zerkin
R. Capote Noy
Software Engineer
(21714)
Nuclear Physicist
(21713)
W.M. Costello
(IT Systems Analyst)
(21724)
V. Semkova
P. Dimitriou
Nuclear Physicist
(21727)
Nuclear Physicist
(21708)
H.-K. Chung
N. Otsuka
K. Nathani
Nuclear Data Physicist
(21715)
Clerk
(21711)
J. Roberts
Nuclear Data Services Assistant
(21725)
A. Oechs
Clerk
(21716)
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Atomic Physicist
(21729)
Marco Verpelli
Systems Analyst/Programmer
(21723)
K. Sheikh
Database Assistant
(21730)
A. Vasaros
IT Systems Engineer (temp.)
(21724)
International Atomic Energy Agency
Nuclear Data Services Webpage
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International Atomic Energy Agency
Nuclear Database: Live Chart of Nuclides
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International Atomic Energy Agency
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International Atomic Energy Agency
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International Atomic Energy Agency
Nuclear Structure and Decay
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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, halflives, decay modes, spin-parity values, magnetic and electric multipole
moments, and nuclear band structure.
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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).
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NSDD Network
(http://www-nds.iaea.org/nsdd)
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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.
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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)
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International Atomic Energy Agency
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NDS CRP’s
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CRP’s cont’d
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Upcoming:
- Intermediate Cross Section and Decay Data for Medical
Applications (2012-2016)
- Reference Database for Beta-Delayed Neutron Emission
(2013-2017)
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International Atomic Energy Agency
Beta-Delayed Neutron Emission
Sn< Qb
Sn
Important nuclear structure information
t1/2(AZ+1): sensitive to low-lying b-strength
Pn : sensitive to b-strength above Sn
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International Atomic Energy Agency
Beta-Delayed Neutron Emission
Energy production:
Pn determines the delayed neutron
fraction beff : important in reactor
kinetics
87Br
137I
88Br
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International Atomic Energy Agency
Beta-delayed neutron emission evaluation
NDS 112,2887, December 2011 Special Issue on ENDF/B-VII.1 Library
“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/BVII and other published values (e.g., Keepin, ENDF/BVI)...” Pg.2950
“…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
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International Atomic Energy Agency
Nuclear Astrophysics:
Far from the stability, b-delayed neutron emission becomes
the dominant decay process. Pn provides the only nuclear
structure information
β-n, -2n,-3n
Moeller et al., PRC67(03)055802
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International Atomic Energy Agency
Beta-Delayed Neutron Emission
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NEW CRP: Reference Database of Beta-Delayed Neutron Emission
Data (2013-2017)
Project Officer: Daniel Abriola, Secondary Officer: P. Demetriou
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Consultants Meeting: 10-12 Oct. 2011 (IAEA)
→Summary Report
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International Atomic Energy Agency
Beta-Delayed Neutron Emission
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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
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International Atomic Energy Agency
Beta-Delayed Neutron Emission
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NEW CRP: Reference Database of Beta-Delayed Neutron Emission
Data (2013-2017)
Project Officer: Daniel Abriola, Secondary Officer: P. Demetriou
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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
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International Atomic Energy Agency
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International Atomic Energy Agency
Summary
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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
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Thank you for your Attention!
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International Atomic Energy Agency