Background information

The library files ENDL for incident neutrons and ECPL for incident charged particles are documented in the references [3] and [5]. These libraries are derived from ASCII evaluated data files located in subdirectories under

$$\tt /nds/data/endl,\ /nds/data/ecpl$$

on the Nuclear Data Group's network. These ASCII files are arranged in separate directories for the different targets, and there is a separate file for each property of each reaction, with the identification incorporated in the name of the file. Thus, the file

$$\tt /nds/data/endl/za016032/yo07c55i001s003$$

pertains to incident neutrons on the target ³²O, the ejected particle is a photon ( $\tt yo$ = 7), the reaction is photon production ( $\tt C$ = 55), and the data gives angular distributions ( $\tt I\_number$ = 1). Furthermore, the value $\tt S$ = 3 indicates that the energy of the emitted photon is given by X₁.

In order to combine this data into a `library' file, see the script

$$\tt /nds/bin/build.mcf.general$$

There are two steps involved. The first step is to run endlret, to make an ASCII file containing all of the data for the particular incident particle reacting with all of the targets. The second step is to run create, to convert the ASCII file to binary.