# Atomic Mass Data
Atomic mass data is extracted from neutron decay sublibrary of ENDFB, JEFF and
JENDL nuclear data libraries.
## Atomic mass
The atomic mass for each nuclide ($m$) is computed from atomic weight ratio ($awr$)
and neutron mass ($m_n$) with following equation :
$$m = m_n \times awr$$
with
$$m_n = 1.008\ 664\ 915\ 95 \ u $$
## Format
Each atomic mass data file is a list of record with whitespace-separated fields
and following format :
```text
..3 : atomic number (Z)
4..7 : mass number (A)
8..9 : isomeric state number (I)
10..17 : nuclide's name (XxAAAmI)
18..31 : nuclide's element name
32..34 : nuclide's element symbol
35.. : nuclide's atomic mass [u]
```
## References
### ENDFB
> Brown, D. A., et al.
> *ENDF/B-VIII. 0: The 8th major release of the nuclear reaction data library with CIELO-project cross sections, new standards and thermal scattering data.*
> Nuclear Data Sheets (2018).
> Volume: 148
> Pages: 1-142
> DOI: https://doi.org/10.1016/j.nds.2018.02.001
### JEFF
> Plompen, A.J.M., Cabellos, O., De Saint Jean, C. et al.
> *The joint evaluated fission and fusion nuclear data library, JEFF-3.3.*
> The European Physical Journal (2020).
> Volume: 56
> Issue: 7
> Pages: 1-108
> DOI: https://doi.org/10.1140/epja/s10050-020-00141-9
### JENDL
> Iwamoto, O., et al.
> *Status of JENDL*.
> In EPJ Web of Conferences.
> EDP Sciences (2020).
> Volume: 239
> Pages: 09002
> DOI: https://doi.org/10.1051/epjconf/202023909002