The JANIS Books are compilations of cross-section curves of evaluated and experimental data from a number of evaluated libraries, nuclear reactions and associated reaction products. JANIS Books are available for nuclear reactions induced by neutrons, photons and light-charged particles.


  • Evaluated data are plotted with full lines for exclusive cross-sections explicitly defined by a MT number, whereas dashed lines indicate residual production cross-sections given in MT5. A star '*' after the name of the library indicates additional operations performed by JANIS, e.g. summation over the ground and metastable yields, reconstruction of residual production cross-sections over the whole energy range.
  • Experimental data sets are identified by the year and first author of the main reference compiled in EXFOR. All experimental data are plotted on the graph but the legend will ignore all of them if there are more than 20 data sets.
  • Evaluated and experimental data may not be comparable in some cases (because of energy resolution, Doppler broadening, solid state effects for neutron scattering on bound-nuclei, etc.).


Web access

Online JANIS Books are up-to-date interactive versions that allow the users to zoom, access complementary information and plot additional data.


PDF files (September 2020)

JANIS Books are available for download in PDF format. The PDF version contains tables of simple integral neutron cross-section data for the main reaction channels, as well as tables of reaction Q values for residual production cross-sections. More information is provided in each of the following Books:


Sample page of the PDF version for the neutron-induced fission of U-238:

JANIS Book sample page (2020-09) 

PDF versions were produced in September 2020. Recent plots are available using online JANIS Books or the JANIS software.

7-Zip archive with a JNS file per page (858 KiB)



May 2018


March 2017


June 2012


Contact: janisinfo@oecd-nea.org

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