Post on 12-Jan-2016
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)
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics.
A Simple view of Nuclear Data?
Utilities, Applications,
Annals of Knowledge
Validation
Refinement
Discovery
ScienceIdeas &Data
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
Provides the bridge between Basic Science and Applied Science
Motivates curiosity of the unknown
Nuclear Datamerges what we can measure with what
we can understand.
Extends our ability to accomplish new feats
Helps us understand the world around us
Primary Activities of USNDPEvaluation: 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 Evaluation ActivitiesWe 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
Contents: Evaluated experimental nuclear structure and decay data for all known nuclei, organized in over 260 mass A-chains
ENSDF is the main product of the USNDP Structure
Group & NSDD
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
Evaluated Nuclear Structure Data FileENSDF 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
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
No viable alternative exists in the world!
USNDP evaluators International evaluators
Present Evaluation ActivitiesPublished “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: A=13 & 14 evaluations
Other Recent Evaluation Activities• Updated near dripline nuclides in ENSDF
– 6B, 7B, 14F, 15Ne, 18Mg, 19Mg, (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
XUNDLCompilation Activities
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)
*Need to resolve future path after Balraj Singh retires
Other Compilation Activities
• 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
Validation
Refinement
Discovery
US Nuclear Data Program Key is to satisfy national interests and meet user needs
Ideas &Data Science