XUNDL Status Report: (May 21, 2005

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XUNDL Status Report(May 21, 2005 May 31, 2007)

• B. Singh, S. Geraedts, M. Mitchell, J.C. Roediger
  
• (McMaster)
• D.F. Winchell, J.K. Tuli, T.W. Burrows
• (NNDC, BNL)
• NSDD-2007, St. Petersburg, Russia June. 11-15,
  2007

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Purpose and Overview

• To provide prompt and convenient web access to
  current publications in experimental
  nuclear-structure data (level-scheme information)
  through on-line retrieval at BNL RADWARE at ORNL
  and Isotope-Explorer at LBNL.
• ENSDF-formatted datasets compiled from one paper,
  or a set of related papers from the same group.
• Covers high- and low-spin reaction and decay
  papers. Daily perusal of web pages of primary
  nuclear physics journals (PR-C, EPJ-A, PRL, NP-A,
  PL-B, JP-G, IJMP-E)
• Compilation work done primarily at McMaster.
  Database management at NNDC.

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Purpose and Overview cont

• Keeping up-to-date with the published literature,
  communication with original authors, and training
  of undergraduate students in basic nuclear
  physics, familiarity with ENSDF, XUNDL and NSR
  databases and computer codes PDF to TEXT to
  ENSDF FMTCHK PANDORA ENSDAT Isotope-Explorer
  GTOL BrIcc LOGFT.
• Various steps of compilation procedures have been
  described at earlier USNDP and NSDD meetings.
• Although the datasets are called as
  unevaluated, each dataset is sort of internally
  evaluated through consistency checks and
  communication with the authors about data-related
  problems and unpublished data.

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Current Contents of XUNDL

• Since the start in December 1998,
• 2225 datasets added up to May 31, 2007 over
  300K lines of data.
• Covers mainly high-spin structures but since
  2003, most low-spin papers have also been
  compiled.
• 1345 nuclides 7Li to 288115, spread over 253
  A-chains few datasets for hypernuclides also.
• Data from over 1700 primary references published
  mainly during 1995 2007 year-wise
  distribution
• 2007-1995 50, 185 205 175 140 151 142
  145 125 130 64 66
• 59

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Work during May 21, 2005-May 31, 2007

• 715 datasets compiled since May 21, 2005 which
  include data from about 300 publications, 55 in
  2007 alone.
• 47 existing datasets revised/updated based on new
  papers from previous authors/groups
• McMaster undergraduate students Max Mitchell and
  Joel Roediger participated in XUNDL work from May
  21, 2005 to April 2007.
• A new undergraduate student, Scott Geraedts
  started in February 2007 and has undergone
  training in the XUNDL compilation procedures and
  basic knowledge of nuclear physics and
  spectroscopy.
• Except for about 12 papers published in journal
  web pages in the last few weeks, we are current
  on the compilation of high- and low-spin primary
  publications. These papers have been compiled but
  not yet checked.

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Communication with authors

• Authors of original papers frequently contacted
  to resolve data-related errors (inconsistencies)
  and/or to request additional details of data
  which are often lacking in publications due to
  space limitations or other reasons
• Generally, prompt and useful response received
  from the authors
• In cases where we received preprints,
  data-related errors pointed out to authors were
  corrected prior to actual publications of paper.
  In other cases, authors have published errata
  based on our communications with them about
  data-related problems.
• Since June 2005, compilation of 70 e-mail
  communications containing additional information
  (data) and/or clarifications was sent to BNL (for
  archival purposes) in Sept 2006, as a composite
  computer file and in print version

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Some difficult examples

• No details of data available, neither in the
• publication nor through requests from the
• authors Examples
• 161Lu and 170Hf in PR-C (2006)
• 58Ni perhaps the most complex high-spin
• level scheme
• About PR-C papers, communicated with an
  Assoc. Editor of PRC. First reply appeared
  encouraging, subsequent response not so.

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Illegible in many places
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Illegible in many places
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600 ? rays
D. Rudolph et al, Acta Phys Pol B 32, 703 (2001)
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ENSDF coverage of Nuclei at the Limits of
Stability

• First primary papers on new Nuclides at the
  limits of Stability bound and unbound.
• First primary paper about excited states in
  nuclides at the limits of stability.
• As part of XUNDL activity, we routinely compile
  papers containing types of discoveries stated
  above.
• With some extra work, we can prepare datasets for
  inclusion in ENSDF.
• Advantage prompt inclusion of such important
  data in ENSDF, NUDAT and other related databases.
• If necessary, the datasets can first be sent to
  the center responsible for that mass region for
  the purpose of approval of a dataset prior to
  entry in ENSDF.
• This point was discussed at US-NDP-06 meeting in
  November 2006. There was
• a general agreement.

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Estimation of number of Detailed (ENSDF-relevant)
Publications per Year

• We estimate average of 180 primary (and
  detailed) papers/year relevant to ENSDF for all
  mass chains. These are the type of papers which
  we compile for XUNDL
• This suggests an average of about 1-2 paper per
  mass chain/year in the active regions.
• This may suggest that a mass chain needs to be
  published in NDS every 10-12 years or so, not
  earlier. Earlier proposed cycle times of 4-5
  years were never met and perhaps not
  recommendable either.

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Conclusions

• Compiled datasets in XUNDL are being used by
  ENSDF evaluators in their A-chain/nuclide
  evaluation work, which may be helping the ENSDF
  evaluation process.
• Based on our XUNDL compilations, we have
  undertaken to prepare ENSDF datasets when either
  first (primary) papers appear on the
  identification of new nuclides (bound or unbound)
  or first published reports of excited states
  (mainly) for nuclei at the limits of stability.
• Future of XUNDL ? If this database is useful and
  to continue on a long-term basis, it is perhaps
  time to consider participation by other data
  centers in compilations. For 2-3 years we will
  continue the activity at McMaster, but it may get
  scaled down after that.