The special issue of atomic quality assessment ame2020 was published in the third issue of Chinese Physics C in 2021. This is the third time after ame2012 and ame2016, the special issue was published in Chinese academic journal "China Physics C".

Atomic quality assessment (AME) is an authoritative source of nuclear quality data, which provides the reference data for the development of nuclear theoretical model, basic symmetry test, research on the process of astronuclear and nuclear technology application. At present, ame cooperation group members are from the Institute of modern physics, Guangdong Laboratory of advanced energy science and technology, argon National Laboratory of the United States, Japan Institute of science and chemistry, Mapu Institute of nuclear physics in Germany and University of sacrai, Paris, France.

The special issue of atomic quality assessment ame2020 contains 13812 experimental data related to the quality of atomic nuclei, and recommends 3557 nuclear masses, which is a comprehensive summary of nuclear mass measurement. At the same time, the atomic mass data sheet is http://amdc.impcas.ac.cn The website is published, so that researchers can download ASCII files directly for computer processing. The work has been supported by the national key R & D plan (2016yfa040004) and the class B strategic leading science and technology project of Chinese Academy of Sciences (xdb340000).

Figure: accuracy of nuclear mass in ame2020