Status Report: XUNDL: www.nndc.bnl.gov/xundl/eXperimental Unevaluated Nuclear Data List (Feb 1, 2013 – April 17, 2015)

Balraj SinghMcMaster University, Canada

IAEA-NSDD-2015 IAEA, Vienna, April 20-24, 2015

Why XUNDL ?

Around 1996, an observation was made by a DOE review panel that high-spin structure data in ENSDF database were outdated.

In 1998, McMaster data group took the initiative to start a program of compiling current papers in high-spin physics and make the compilations available in ENSDF format.

Consultations about the need and mechanism of this activity were held in 1998 with several researchers in nuclear structure physics at universities and major labs in US and Canada.

Actual compilation work started at McMaster in Fall 1998 for mainly the high-spin publications, and with the involvement of McMaster physics undergraduate students. At Dec. 1998, IAEA-NSDD meeting in Vienna, this project was formally approved as an NSDD activity, and was also christened (by Richard Meyer) as XUNDL.

XUNDL: scope

Compilation (in ENSDF format) of recently published experimental nuclear structure (and decay data) articles.

In general, the information in a given XUNDL dataset comes from a single journal article, or from a set of closely related articles from the same experimental group.

Supplemental material sent by researchers in support of their published papers is also compiled and archived. Active and timely communication between data compilers and original authors of publications is encouraged.

All contributed datasets are reviewed and edited, as needed, by the XUNDL coordinator and editor.

XUNDL: scope

Critical compilation (not just data entry) of Experimental Nuclear Structure data from reactions and radioactive decays published in current papers in primary nuclear physics journals, PRC, PRL, NP-A, EPJ-A, PL-B, JP-G, and several others. Regular scanning of current literature (independent of NSR).

Papers generally not covered in XUNDL:•Data from papers reporting discovery of new nuclides, and first observation of excited states: such papers are directly included in the ENSDF database, when not much overlap with previous data in ENSDF.•Mass measurement papers: compiled file from such papers is prepared annually at McMaster and sent to Michael Smith (ORNL) to make it available on nuclearmasses.org webpage . •Continuum gamma-ray spectroscopy in high-spin, gamma-strength functions, and TAS measurements. Structure data for hypernuclei.

ENSDF-formatted data files are made available through on-line retrieval system at NNDC, BNL; and RADWARE level-scheme database at ORNL.

Compilation Procedures

Since 1999, long data tables in papers automatically converted to ENSDF format through scanning techniques, followed by a text-to-ENSDF translation code, first written on request by David Radford (ORNL), later in 2003 in C++ by Roy Zywina at McMaster, still in use. Around 2011, Jun Chen at McMaster wrote another code on similar lines but extended in features, which I believe is now a more advanced code in python developed by him at ANL.

Consistency checks, decay-scheme normalizations, and other quantities deduced/added making full use of suite of ENSDF computer codes. Students trained in use of these codes.

Frequent communications with authors of articles about data-related inconsistencies, and obtaining additional data details.

Perceived benefits of XUNDL database

• Provides prompt and convenient web access to formatted structure data from current publications through on-line retrieval systems.

• Complements ENSDF database for those nuclides for which data in ENSDF are outdated.

• Corrections in existing datasets in ENSDF database based on compilations.

• Prompt update of ENSDF database for newly discovered nuclides and for those nuclides for which excited-state data become available for the first time.

• Timely communications with authors to resolve inconsistencies, and to obtain additional details of data. Some authors have sent submissions to XUNDL database for repository of data, which do not appear in their papers, but are referred to XUNDL

Participants in XUNDL work

McMaster (from 1998): B. Singh, E. Thiagalingam (*!), E. McNeice (*!) , M. Walters (*)

ANL (from 2008) F. Kondev, J. Chen (April 2012 – Nov 2014)NSCL (from Dec 2014) J. Chen

TUNL (from 2009): J. Kelley, G. Sheu, J. Purcell : A=2-20 mass region

ORNL (from Oct 2013): C. Nesaraja, C. Smith (since Aug 2014), J. Batchelder (Oct-Dec 2014)

LBNL (from Nov 2013): S. Basunia, A. HurstLLNL (from April 2014): L. Bernstein, M. Trudel (*)

BNL (from July 2014): E. McCutchan

2013-2015: S. Lalkowski, S. Kumar, A. Chakraborti also contributed some datasets

Database management at NNDC, BNL: D. Winchell (1998-2008), J. Tuli (2008- ) (*): Undergraduate student. (!): Jan 2012-Dec 2013.

Current Contents of XUNDL

•Since the start in December 1998, 6190 compiled datasets added up to April 17, 2015. (Average: 7.25 datasets per week over 852 weeks)

•Covers mainly high-spin structures up to ~2004.

•Almost all experimental structure papers from major journals between 2005 - 2015. •Data for 2317 nuclides: 1H to 294118, spread over 288 A-chains; •Data from 3742 primary journal articles published during 1993 – 2015

•About 900 communications with the authors to resolve data inconsistencies and to obtain additional data details. Several errata published based on these.

•Some XUNDL submissions by authors in support of their regular publications.

Compilations during Feb 1, 2013 to April 17, 2015 1136 datasets compiled from 492 publications +78 updated datasets for new papers from the same groups McMaster: 685 from 192 papers + 451 from other centers reviewed, and edited if needed. 70 datasets updated for new papers or additional data received. ANL + NSCL: 30 (ANL) from 13 papers + 130+1 update (NSCL: since Dec 2014) from 85 papers (14 with McMaster) TUNL: 138 from 116 papers ORNL (since Oct 2013): 68 datasets from 33 papers (4 with McMaster)

LBNL +LLNL+UCB (since Nov 2013): 53+2 updates from 30 papers (11 with McMaster) BNL (since July 2014): 33+5 updates datasets from 23 papers

Temporary key-numbers in XUNDL compilations to permanent ones in NSR database replaced at McMaster two times a year using M. Birch’s computer code.

Last update done April 15, 2015

Compilation of Atomic mass measurements

30 mass measurement papers (mainly in PRL, PRC) from Nov 2012-Nov 2014 were compiled at McMaster with about 195 data points.

These data files are available on Michael Smith’s webpage:

www.nuclearmasses.org

NEW: Plan to compile papers on TAGS data: Example: D.Jordan, A.Algora, J.L.Tain et al., PRC 87, 044318 (2013):

Total absorption study of the β decay of 102, 104, 105Tc

Numerical data for Eγ vs. counts in Fig. 4 received from Alejandro Algora

April 14, 2015.

Dataset for 104Tc to 104Ru decay prepared for XUNDL and sent to Alejandro for comments April 16.

Need to include response function matrix: E, J, value, which he will supply

Example of TAS data: 2013Jo02: PRC 87, 044318 (2013):

Data up to Q-=5.6 MeV for Tc-104 decay

Pseudo-levels at 40-keV interval and corresponding beta-feeding records listed.

Please check Ru-104 dataset from TC-104 decay in XUNDL database.

Feedback is welcome, so that we can proceed with other TAGS publications.

XUNDL Coordinator’s current schedule

• Scan journal webpages: PR-C, PRL, PL-B, EPJ-A, NP-A, JP-G, Nature. Also: ARI, NIM-A, NIM-B, CPL, CP-C, IJMP-E, PAN, BRAS, APP-B, arXiv.

• Select papers for XUNDL or for ENSDF. See if author needs to be contacted for additional data details.

• Compile papers as time permits.• Suggest papers to data centers, and get their agreement.• Review (and run FMTCHK, SPELLCHECK) datasets received from

compilers and edit as needed. If any major change made, send edited data file to compiler for comments.

• Upload datasets on NNDC ftp site.• Check if all transmitted datasets to NNDC are in XUNDL database.• Twice a year, replace temporary key-numbers with NSR assigned key-

numbers.• Send compiled file of new mass measurements each year to Michael Smith

at ORNL

FUTURE OF XUNDL DATABASE

Next generation XUNDL coordinator

• Interested in the compilation activity, • Active, unhesitating communication with authors.• Consistent work schedule, papers keep coming every

week.• Keep up-to-data with new literature, independent of

NSR.• Be willing to coordinate this activity for the next 20

years or so.

From Oct 1, 2015 onwards:

• I am glad to report that Libby McCutchan (NNDC, BNL) has agreed to be the next XUNDL coordinator.

• For the first few months I am prepared to assist for a smooth transfer of this effort.

• NSDD and US-NDP Networks should be thankful to Libby in taking up this activity!