# Isotope Information Files

## mass.mas20
This file contains atomic mass adjustment data. It includes information such as:
- Atomic mass excess (keV)
- Binding energy per nucleon (keV)
- Beta-decay energy (keV)
- Atomic mass (micro-u)
PLEIADES usage: Atomic mass, Binding energy per nucleon, Beta-decay energy

## neutrons.list
This file lists neutron evaluation data. It includes:
- Material and laboratory information
- Evaluation date
- Authors
- Material identifier (MAT)
PLEIADES usage: ENDF Material identifier number.

## isotopes.info
This file is an EasySpin nuclear isotope database. It contains:
- Number of protons and nucleons
- Radioactive or stable status
- Element symbol and name
- Spin quantum number
- Nuclear g factor
- Natural abundance (percent)
- Electric quadrupole moment (barn)
PLEIADES usage: spin quantum number and natural abundance
