Identification of the target

We start with the quantities:

nnza:

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 $\tt nnza$ = 8000 for natural oxygen. Also, the values $\tt nnza$ = 99120 and 99125 are used for fission fragments. Furthermore, in some instances $\tt nnza$ = - 9 denotes an electron.

atm:

The atomic mass of the target.

elevel:

The excitation level of the target.

halflife:

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.

ndatsyz:

The number of data words following the directory.

numc:

The number of reactions for the target.