CRPropa needs a number of data files to run. These include databases for nuclear mass and decay rates, interaction rates for photodisintegration, photo-pion production and electron-pair production, as well as the data files for DINT and EleCa. The scripts and files that are used to prepare the data files are tracked by the CRPropa3-data repository.

Since a git repository is not well suited to store these large files (and git-lfs is not free on GitHub), the data files are downloaded automatically during cmake configuration. In case you want to use a different photodisintegration model or want to download the default data file manually use the following link to the tarballs files and extract them to your install folder.

Default data files: (data-YYYY-MM-DD.tar.gz where YYYY-MM-DD depends on the data files version) Contains interaction rates nuclei, electrons and photons and spectra of secondary particles from these interactions, as well as data on nuclear masses and decay rates. Uses photodisintegration cross sections (for A > 12) from TALYS 1.8 with a partially modified set of GDR parameters.

Alternative 1: (data-2016-03-21-Kossov.tar.gz) Photodisintegration interaction rates for the Kossov model.

Alternative 2: (data-2016-03-21-PSB.tar.gz) Photodisintegration interaction rates for the PSB model.

# Verify the Data Files Integrity¶

Every data file should have a corresponding -CHECKSUM file in which the appropriate MD5 sum is stored. A checksum file can be generated as follows:

$ls data-YYYY-MM-DD.tar.gz | xargs -I{} sh -c 'md5sum "$1" > "$1-CHECKSUM"' -- {}  where YYYY-MM-DD can be obtained directly with date +"%Y-%m-%d". To verify the integrity of the data files, a it is enough to download the checksum file in the same directory with the data file: $ md5sum -c *-CHECKSUM


Files that are automatically downloaded with CMake are also automatically verified by CMake.