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We start with the quantities:
- The atomic number and mass number for the target. The format is
1000*Z + A, but there are special cases. The value A
= 0 denotes a natural element, so that
= 8000 for natural oxygen. Also, the values
= 99120 and 99125 are used for fission fragments. Furthermore,
in some instances
= - 9 denotes an electron.
- The atomic mass of the target.
- The excitation level of the target.
- The halflife. Stable isotopes are given a halflife of 1050.
- (date, nwd):
- Two 32-bit integers, containing the date of the most recent update for this
target and the length of the target directory.
- The number of data words following the directory.
- The number of reactions for the target.