INTERNATIONAL NETWORK OF NUCLEAR STRUCTURE AND DECAY DATA EVALUATORS (NSDD)
Updated Guidelines 2021
Updated guidelines for nuclear structure and dceay data evaluators are available ORNL/TM-2022/1835. The revision of the guidelines started in 2015 at the IAEA Specialized Workshop on Nuclear Structure and Decay Data Evaluations and was completed and edited by Murray Martin (ORNL) in April 2021.
New recommended electric quadrupole moments
Status Reports of NSDD Data Centres May 2021
Recommended nuclear moments
Recommended nuclear dipole magnetic moments have been published by N.J. Stone in INDC(NDS)-0794 (long-lived states) and INDC(NDS)-0816 (short-lived states). The data are available on the IAEA Nuclear Moments database.
New AME2020 and NUBASE2020 release
The AME2020 and NUBASE2020 evaluations have been published in Chinese Phys. C 45 030002 (2021)(PDF), 030003 (PDF), and in Chinese Phys. C 41 030001 (2021) (PDF), respectively. The data files are available on the IAEA AMDC, and IMP, ANL webpages.
New r0 parameters from alpha decay of even-even nuclei
New radius (r0 ) parameters from alpha decay of even-even nuclei have been published by Sukhjeet Singh, Sushil Kumar, Balraj Singh, and A.K. Jain in Nuclear Data Sheets 167 (2020) 1-35 [doi.org/10.1016/j.nds.2020.07.001].
This work is an update of Yurdanur Akovali's 1998Ak04 work at Oak Ridge
and includes updating half-lives, alpha-branching ratios, and r0 values for all the even-even alpha emitters, including superheavy elements up to Og.
The new r0 parameters will be incorporated in an upcoming updated version of the ALPHAD-radD code to extract alpha decay hindrance factors.
The Nuclear Structure Experimental Issues Database (NSEI)
The Nuclear Structure Experimental Issues (NSEI) Database was created with the purpose of collecting information on issues or gaps in experimental data that have been identified by the ENSDF evaluators or users of ENSDF and proposing them for further action.
The website was designed by IFIN-HH, Romania and the University of California, USA and is currently hosted on the UC Berkeley web servers. It can be accessed at: https://nucleardata.berkeley.edu/hpnsrl/
The website allows the users to add new experimental issues and also to upload comments to the existing issues. Both these actions are subject to the approval of the moderators of the website (i.e. the authors of the present report) who will then reach out to researchers who might potentially be able to address the issue.
Improvement of Analysis Codes for NSDD evaluations
Progress in the development of new analysis codes and editors for NSDD evaluations as well as improvements in existing codes and further needs was discussed at the Technical Meeting on Improvement of Analysis Codes for NSDD Evaluations, 3-7 December 2018, IAEA, Vienna.
Evaluation of Nuclear Moments
A Consultant's Meeting was held at the IAEA, from 27 to 30 March 2017, to address the need for providing recommended nuclear magnetic dipole moments (DM), in addition to updating the evaluation of electric quadrupole moments (QM) performed by P. Pyykkö (Mol. Phys. 106 (2008) 1965) and N. Stone (INDC(NDS)-0650).
Meeting participants discussed the necessary corrections required for DMs to consider effects of diamagnetism, hyperfine anomaly, model assumptions for short-lived states, as well as advances in electric field gradient calculations for the QMs. They agreed to contribute to the production of a table of evaluated nuclear moments that would be made available in a published volume and incorporated in the online Nuclear Moments database.
The Nuclear Data Section has began a Data Development Project to address all the problems that are encountered in the utilization of the existing ENSDF codes in view of the overall need to re-structure and/or re-write them using modern programming tools. The kick-off Technical Meeting was held at IAEA headquarters in Vienna, from 10 to 13 June 2014. The output of this meeting was a priority list of codes that need to be improved and a list of assignments/tasks to be delivered within a given period. A summary report of the meeting is available INDC(NDS)-0665. Presentations given at the meeting are available here.
A follow-up meeting to monitor progress and revise the assignments as deemed necessary was held from 5 to 8 October 2015, at the IAEA, in Vienna. The summary report of the meeting is available INDC(NDS)-0696. The presentations given at this meeting can be found here.
A dedicated web page on the IAEA ENSDF Codes development project is available at this link.
The database comprises data found in print compilations (INDC(NDS)-0650, INDC(NDS)-0658), peer-reviewed journals and conference proceedings. The user can click on a built-in periodic table to choose an element and then the isotope of interest. Alternatively, the user can type in the atomic (Z) or mass (A) number in input form. The data are displayed in a concise tabulated form. Bibliographical information has been linked to the sources, i.e. NSR key numbers are linked to the NSR database, and in addition, Digital Object identifiers (DOI) have been added to all the publications featuring one. Further developments will include enhancement of retrieval capabilities and plotting tools.
The database can also be accessed from the "Quick links" (left column), the "Structure & Decay" tab, and the Livechart - tab "Nuclear Moments", all available on the IAEA Nuclear Data Services website.
The workshop took place from 27 to 29 April 2015 at the IAEA Headquarters in Vienna. Active NSDD evaluators met to
- discuss frequently encountered problems in their evaluation work,
- be informed on evaluation policies and their implementation,
- be updated about analysis codes,
- refresh their evaluation skills.
The workshop coordinators, Filip Kondev (ANL/USA) and Elizabeth McCutchan (BNL/USA), put together a scientific programme that covered a number of issues of importance to ENSDF evaluations, including policies, procedures, formats, and codes, with special advise from Murray Martin (ORNL/USA). The 'lectures' were based on a combination of presentations and round-table discussions evolving around specific examples and highlighting 'best practices'.
During the workshop, participants also had the opportunity to discuss topics of their preference stemming from their own evaluation work. Several 30-minute long sessions were devoted to discussing participant's topics on Wednesday, 29th April.
The workshop also produced an updated version of the Guidelines for Evaluators by M. Martin.
Nuclear Moments Tables
The updated table of Magnetic Dipole and Electric Quadrupole Moments, prepared by N.J. Stone to replace the previous one (INDC(NDS)-0594), has been published in INDC(NDS)-0658. It covers the literature up to February 2014.
A table of static electric quadrupole moments including recommended values, also prepared by N.J. Stone, is available in INDC(NDS)-0650.
An ENSDF Retrieval Program
Matthias Nagl and his group,at Physikalisches Institut, Georg-August-Universität Göttingen, Germany, has created a retrieval program for ENSDF. The program is a stand-alone retrieval and has very useful options including a decay scheme and its spectral representation. The software is open source and the authors encourage users to freely download and use it. It is available for download here. The related paper is available here.
Meeting on XUNDL 2013
A 1.5 day working group meeting was held on 16-17 May 2013 at the Triangle Universities Nuclear Laboratory to discuss activities connected with XUNDL.