The package janus.database.minimaterials contains the classes responsible for maintaining the contents of the nuclei that appear in the nuclide chart.
A MiniMaterialMatrixRow object is comprised of a row of MiniMaterial objects. Each MiniMaterial object is equivalent to a nucleus. A nucleus may have different excitation states. These states are represented as MiniMaterialState objects. A MiniMaterial object may have up to four states defined in the field states. Currently only two states are displayed. The fields, chartZ and chartN, contain the respective Z and N values for the nucleus. For natural materials, there is no physical N.
In the nuclide chart, each state is displayed in a quadrant of the cell. State[0] is the GROUND_STATE and state[1] is the FIRST_METASTABLE. The ground state is when the nucleus is at the lowest energy state. Usually nuclei are present in the ground state.