Development of JENDL-5 and future perspective

The latest version of Japanese evaluated nuclear data library JENDL-5 was released at the end of 2021. In addition to update of the neutron data in the previous version JENDL-4.0, the upper limit of the incident neutron energy more than 70% of the nuclides in the neutron sublibrary was extended to 200 MeV. In addition, the total number of nuclides increased to 795 from the previous number of 406, where activation related data i.e., isomer production information were integrated. JENDL-5 also integrated the various types of reaction data such as photon, proton, deuteron, and alpha-particle induced ones which had been released as special-purpose files of JENDL. Their data were partly updated and complemented to satisfy requirements of radiation transport calculations from the original releases. For the next release of JENDL-5, we are planning to enhance covariance data for neutron reactions whose updates are very limited in JENDL-5. The charged particles reactions, whose data in JENDL-5 are much less than neutron ones, would be also a target of the next release.