Chinese Physics C

2021 Vol. 45, No. 3

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NUCLEAR PHYSICS

The NUBASE2020 evaluation of nuclear physics properties

Kondev F.G., M. Wang, W.J. Huang, S. Naimi, Audi G.

2021, 45(3): 030001. doi: 10.1088/1674-1137/abddae

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Abstract:
The NUBASE2020 evaluation contains the recommended values of the main nuclear physics properties for all nuclei in their ground and excited, isomeric (T_1/2

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100 ns) states. It encompasses all experimental data published in primary (journal articles) and secondary (mainly laboratory reports and conference proceedings) references, together with the corresponding bibliographical information. In cases where no experimental data were available for a particular nuclide, trends in the behavior of specific properties in neighboring nuclei were examined and estimated values are proposed. Evaluation procedures and policies that were used during the development of this evaluated nuclear data library are presented, together with a detailed table of recommended values and their uncertainties.

The AME 2020 atomic mass evaluation (I). Evaluation of input data, and adjustment procedures

W.J. Huang, Meng Wang, Kondev F.G., Audi G., S. Naimi

2021, 45(3): 030002. doi: 10.1088/1674-1137/abddb0

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Abstract:
This is the first of two articles (Part I and Part II) that presents the results of the new atomic mass evaluation, AME2020. It includes complete information on the experimental input data that were used to derive the tables of recommended values which are given in Part II. This article describes the evaluation philosophy and procedures that were implemented in the selection of specific nuclear reaction, decay and mass-spectrometric data which were used in a least-squares fit adjustment in order to determine the recommended mass values and their uncertainties. All input data, including both the accepted and rejected ones, are tabulated and compared with the adjusted values obtained from the least-squares fit analysis. Differences with the previous AME2016 evaluation are discussed and specific examples are presented for several nuclides that may be of interest to AME users.

The AME 2020 atomic mass evaluation (II). Tables, graphs and references

Meng Wang, W.J. Huang, Kondev F.G., Audi G., S. Naimi

2021, 45(3): 030003. doi: 10.1088/1674-1137/abddaf

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Abstract:
This is the second part of the new evaluation of atomic masses, AME2020. Using least-squares adjustments to all evaluated and accepted experimental data, described in Part I, we derived tables with numerical values and graphs which supersede those given in AME2016. The first table presents the recommended atomic mass values and their uncertainties. It is followed by a table of the influences of data on primary nuclides, a table of various reaction and decay energies, and finally, a series of graphs of separation and decay energies. The last section of this paper provides all input data references that were used in the AME2020 and the NUBASE2020 evaluations.

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