nuclear structure data evaluation & frib
DESCRIPTION
Nuclear Structure Data Evaluation & FRIB. John Kelley * NCState and TUNL for Filip Kondev. [email protected]. Low Energy Community Meeting, MSU, August 23-24, 2013. Outline. Introduction: what is Nuclear Data historical perspective Major Nuclear Physics Databases: - PowerPoint PPT PresentationTRANSCRIPT
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Nuclear Structure Data Evaluation & FRIB
Low Energy Community Meeting, MSU, August 23-24, 2013
John Kelley * NCState and TUNL for Filip Kondev
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Outline
Introduction:
what is Nuclear Data
historical perspective
Major Nuclear Physics Databases:
NSR, ENSDF, XUNDL, AME
Other useful resources:
Nuclear Structure and Nuclear Astrophysics
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~3000
~3000 nuclei the knowledge is very
limited or nonexistent!
~6000 nuclei are predicted to
exist
Proton Drip Line
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What is Nuclear Data?
… too applied to the basic physics …too academic to the applied physics …
Generally: any result produced in a NP experiment can qualify
Historically: associated with neutron cross sections and fission like applications
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Nuclear Physics in Importantastrophysics, medicine, energy production, security
supernova explosionnuclear power plant
99mTc bone scan238PuO2
(87.7 y)Cassini spacecraft - Saturn
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Nuclear Physics is (still) a Big Challenge
Question 3How were the elements from
iron to uranium made ?
11 physics questions for the new century
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it is an interesting time in Nuclear Physicsevaluated nuclear data - support various applications, assist scientific discoveries and preserve the knowledge for future generations
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What takes to do a good evaluationit is a time consuming effort!
critical reading of all published (and sometime unpublished) work on a particular nuclide – working with the authors when possible compilation of the results in appropriate formats - prepare individual data sets
critical review - recommends best values for a range of nuclear properties (not simply averaging numbers!)
a number of computer codes are applied to check the data for consistency or to deduce some quantities, e.g. ICC, BXL, log ft, etc. the human factor is also very important
peer-review process – completeness & quality!
publication in Nuclear Data Sheets (and on the Web)
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What should a good database look like? Comprehensive:
All related quantities should be included, together with estimates of their uncertainties
Reliable: Data should be correctly represented
Complete: All available data of each type should be included
Up-to-Date: Consequences of new measurements should appear promptly
Accessible: Data should be easily available to the users via modern dissemination tools
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What is the value of evaluated data? Interactive access to properties of many nuclei with a click of a mouse …
Archival of all nuclear structure and decay data
Resolve differences between overlapping and contradictory results
Beneficial consequences for nuclear theory development
Beneficial to many applied areas such as nuclear medicine, reactor engineering, environmental impact assessment, nuclear waste management, activation analysis, etc.
Identify and stimulate needs for new measurements
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Nuclear Structure Data Evaluationassociated with nuclear structure databases – complex nuclear level schemes and tables of numerical values, which quantify fundamental nuclear structure information, such as level energies and quantum numbers, lifetimes, decay modes, and other associated properties.
Nuclear Data Evaluation network activityservice to various communities
these databases are not only at the core of basic nuclear structure and nuclear astrophysics research, but they are also relevant to many applied technologies, including nuclear energy production, reactor design and safety, medical diagnostic and radiotherapy, health physics, environmental research and monitoring, safeguards, material analysis,
etc.
Today, far larger and more complex databases are urgently needed in many fields!
Nuclear Physics perhaps has one of the best!
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Evaluation History – cont.
courtesy of E. Browne (LBNL)
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“Google can do it all …”
access to the most relevant articles and evaluated data on a particular nuclide access the recommended (best) values for a range
of nuclear properties search on a specific nuclear property, quantity or reaction
a lifetime of a graduate student????
Nuclear Science References (NSR)
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collaboration of scientists from ANL, LBNL, McMaster U. (Canada), NNDC (BNL), ORNL, TUNL & Texas A&M U, supported by the Office of Nuclear Physics, Office of Science, US DOE
leveraged with effort from colleagues from several countries within the NSDD Network, established in 1974 under the auspices of IAEA, Vienna
Compile, Evaluate, Measure and Disseminate Nuclear Structure and Decay Data for ALL known nuclei (more than 3000!) that are used in basic science research and technology applications
What we do:
Nuclear Structure & DecayNuclear Reactions
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Backbone of NSDD – leadership, technical expertise and mentoring host & maintain ENSDF, NSR & network programs
developing countries
Europe, FSU & Turkey Asia – Japan, China, India & Kuwait S. AmericaAustralia
NSDD Network
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www.nndc.bnl.govThe focal point
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Contents: Evaluated nuclear structure and decay data for all known nuclei, organized in over 290 mass chains
Adopted(best values)Levels:(E, J, T1/2, , Q, configurations)Gammas:(E, BR, M,, ICC)
Decays-
++
-netc.
Reactions(HI,xn)(p,p’)(n, ), (n,xn)Coul. Exc.(,’), (,xn)(d,p), etc.
ENSDF
www.nndc.bnl.gov/ensdf
ENSDF – the core database
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ENSDF – the core database – cont.ENSDF is the only Nuclear Structure database that is updated continuously – contains information for ALL nuclei and ALL nuclear level properties & radiations – currently contributed by members of the Nuclear Structure and Decay Data Network, under auspices of IAEA. It is maintained by NNDC and the NSDD role is indispensible!
No viable alternative exists in the world!
MIRD
RADWARE
Monte-Carlo Codes MCNP, GEANT,
EGS4
ORIGEN, CINDER90
NUBASE
RIPL
ORTEC & CANBERRA
ENSDFApplications
ENDF, JEFF, JENDL …
Simulations
Basic NP Research
RNALPGAANuDat astrophysics
IE
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NDS e-Subscr. (Elsevier) – 4705 accounts with 11.7K (paid) downloads (2007)
USA & Canada(25%), EU (39%), Asia (33%), Africa (1.5%) & Australia (1.5%)
ENSDF usage
www.nndc.bnl.gov
44% US & Canadapreparation of experiments – during experiments – data analysis & publications – journal reviewers etc.
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J=68 (SD 152Dy)?
130Ag-21 n from 109Ag169Au-28 n from 197Au
Ex=36 MeV (149Gd)
from 2923 nuclei known785 nuclei with only 1 level1101 nuclei with no known 40Ca – 578 levels53Mn – 1319 rays
E6 in decay of the 19/2- (2.5 min) isomer in 53Fe
www.nndc.bnl.gov/ensdf
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Pro
ton
sChallenges away from the line of stability
What was believed to be in 177Yb is actually an excited structure in the
neighboring 175Yb isotope
177
175
178
50 100 150
Neutrons
Proton drip line
Neutron drip line
100
50
Several publications in Phys. Rev. C
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… a paper that was not so correct …
From: Balraj Singh [[email protected]]Sent: Thursday, May 12, 2005 5:52 PMTo: Kondev, Filip G.Subject: Re: NSDD-2005: Visa ; 174Yb paper
Hi Filip:…About 174Yb: We have compiled your paper for XUNDL and will send it to BNL today. There is one curious thing about the 830-microsecond isomer. In the literature (ENSDF and 1967Bo08: NP A96, 561) value of 830 corresponded to half-life rather than meanlife. In your paper it is being referred as meanlife everwhere, including in table III where BEL's are deduced. Also in table III, for 628 gamma from this isomer, I seem to get BE2 a factor of 10 higher than your value using 830 as meanlife. Could you please check these points and let me know what you think.
Thanks,Balraj
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Horizontal Evaluations and Topical Reviews
Log ft values in -/(EC+b+) decay
Alpha-decay HF from even-even nuclei
Nuclear Moments ( and Q0)
Proton Radioactivity Decay Data
many other applications oriented …
Nuclear Data Sheets v. 97 (2002) 241
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Opportunities
Overseas: RIKEN, TRIUMF, GANIL, CERN, GSI (planned)
a surge of new data can be foreseen in the near future – nuclear structure & reactions involving radioactive nuclei far from the line of stability – all new data need to be promptly compiled, evaluated & disseminated to enhance scientific discoveries and to assist technology applications - development of new evaluation methodologies, strategies & dissemination tools that are tailored to the specific needs of variety of users – archive for future generations
The NP community would require even more sophisticated databases that couple Experiments, Theory & Data Evaluation with the modern
computer technology
U.S. facilities: ANL, ORNL & MSUFRIB – the future in U.S.
GRETINA-AGATA ray tracking arrays
~3000 nuclei yet to be discovered
~3000 nuclei known
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up in the Cloud ….
Thank you!