tunl review – dec. 8/9, 2014 tunl contributions in the us nuclear data program (usndp) &...
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TUNL Review – Dec. 8/9, 2014
TUNL Contributions in the US Nuclear Data Program (USNDP) &Nuclear Structure and Decay Data (NSDD) Network
Nuclear Structure Data Evaluation Program J.H. Kelley - USNDP Structure Group Chair: (5 months FTE),
J. Purcell (emeritus 0.1 FTE), G. Sheu (Adm. Assist. 0.75 FTE)
& Kent Leung (post doc 0.5 FTE)
TUNL Review – Dec. 8/9, 2014
A Simple View of Nuclear Data?
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Utilities, Applications,
Annals of Knowledge
Validation
Refinement
Discovery
ScienceIdeas & Data
TUNL Review – Dec. 8/9, 2014
What is Nuclear Data?
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… too applied for basic physics …too academic for applied physics
Generally: any result produced in a NP experiment can qualify
Historically: associated with neutron cross sections and fission like applications
TUNL Review – Dec. 8/9, 2014
Nuclear Data Merges What We Can Measure With What We Can Understand.
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Provides the bridge between Basic Science and Applied Science
Motivates curiosity of the unknown
Extends our ability to accomplish new feats
Helps us understand the world around us
TUNL Review – Dec. 8/9, 2014
Primary Activities of USNDP
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Evaluation: Evaluated Nuclear Structure Data File (ENSDF/IAEA) Evaluated Nuclear Data File (ENDF)
Compilation: Nuclear Science Reference database (NSR) eXperimental Unevaluated Nuclear Data Library (XUNDL) EXperimental nuclear reaction data (EXFOR/IAEA)
Dissemination: NNDC Website
Repackaging/ tailored user interfaces: NuDat, Nuclear Data Sheets, Table of IsotopesRIPL, Medical Internal Radiation Dose Program,MCNP, GEANT4, CINDER90, etc…
Experiment: Basic science, horizontal studies, data for validation studies.
TUNL data group website
TUNL Review – Dec. 8/9, 2014
TUNL Evaluation Activities
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We are responsible for nuclear structure evaluation in the A=2-20 mass region
Energy Levels of Light Nuclei reviews published in Nucl. Phys. A– Follow style of Fay Ajzenberg-Selove– Broad scope of reactions is included – discussion format. – Adopted levels/gammas, energy level diagrams
Evaluated Nuclear Structure Data File (ENSDF) for A=2-20– More rigorous information required– Better documentation of original sources– Evaluate reaction data sets/decay data sets
– Deduce adopted levels/gammas, decay widths, etc.eXperimental Unevaluated Nuclear Data Library (XUNDL) A=2-20
– ENSDF style compilation of current literature
Web interface for A=3-20 Information
TUNL Review – Dec. 8/9, 2014
ENSDF is the Main Product of the USNDP Structure Group & NSDD
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Contents: Evaluated experimental nuclear structure and decay data for all known nuclei, organized in over 260 mass A-chains
Adopted(best values)
Levels:(E, J, T1/2, , Q, configurations)Gammas:(Eg, BR, M,, ICC)
Decays-
++
-netc.
Reactions(HI,xn)(p,p’)
(n, ), (n,xng)Coul. Exc.
(,’), (a,xng)(d,p), etc.
ENSDF
www.nndc.bnl.gov/ensdf
TUNL Review – Dec. 8/9, 2014
ENSDF database plays a seminal role in scientific discoveries & many applications the only nuclear structure database that is updated continuously contains level properties & decay radiations for ALL nuclei coordination is supported by NNDC and the IAEA/NSDD network experimentally based
Evaluated Nuclear Structure Data File
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No viable alternative exists in the world!
ENSDF
RADWARE
NUBASE
Basic NP Research
NuDat astrophysics
IE
Monte-Carlo Codes MCNP, GEANT, EGS4, ORIGEN,
CINDER90
Simulations
MIRD RIPL
ORTEC & CANBERRA
Applications
ENDF, JEFF, JENDL …
RNALPGAA
New at NSCL/FRIBUSNDP evaluators International evaluators New at UC BerkeleyIAEA seed funds
TUNL Review – Dec. 8/9, 2014
Present Evaluation Activities
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Published “Energy Levels of Light Nuclei: A=3”Purcell, et al., Nucl. Phys. A848 (2010) 1
“Energy Levels of Light Nuclei: A=11”Kelley, et al., Nucl. Phys. A880 (2012) 88 (ENSDF Updated)
Work in progress:– A=12 Evaluation for “Energy Levels” (J. Kelley)– Preparing A=12 ENSDF file– Preparing A=3 ENSDF file(J. Purcell)– Preparing A=2 for Nuclear Data Sheets and ENSDF
(K. Leung & H.R. Weller)
Future: Evaluate A=13 & 14 nuclides
TUNL Review – Dec. 8/9, 2014
Other Recent Evaluation Activities
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• Updated near dripline nuclides in ENSDF– 6B, 7B, 14F, 15Ne, 18Mg, 19Mg, – Plan to update heavy Be and C isotopes
• Updated ENSDF Reaction Data sets– b: 14Be, 14B, 19N, 20N– b-n: 12Be, 13B, 14Be, 14B, 15B, 16C, 17B, 17C, 17N, 18C, 18N,
19B, 19C, 19N, 20C, 20N– b-p: 9C, 11Be, 13O, 20Mg– -b a: 9C, 11Be, 14Be, 17N, 18N, 20Na
TUNL Review – Dec. 8/9, 2014
XUNDL - Compilation Activities
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eXperimental Unevaluated Nuclear Data Library– Up-to-date compiled structure data library– New articles added within 1-2 months– Feedback loop between source and evaluator– Committed to A=2-20 since April 2009– 60-65 data sets/year (5-6/month)– ~20% of activity is in this mass region (articles)
*Need to resolve future path after Balraj Singh retires
TUNL Review – Dec. 8/9, 2014
Other Compilation Activities
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• Compilation of ground state decay & b-decay references and data
• Compilation of (p,X) and (a,X) excitation functions
• TUNL Dissertations-– http://www.tunl.duke.edu/nucldata/Theses/TUNL_Theses.shtml
TUNL Review – Dec. 8/9, 2014
TUNL Nuclear Data Website Usage
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Added compilation of TUNL dissertations
TUNL Review – Dec. 8/9, 2014
US Nuclear Data Program:Key is to satisfy national interests and meet user needs
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Validation
Refinement
Discover
Ideas &Data Science