ANITA-IEAF: an intermediate energy neutron activation system

ANITA-IEAF is an activation package (code and libraries) developed in ENEA-Bologna in order to assess the activation of materials exposed to neutrons with energies up to 55 MeV. It is suitable to be applied to the study of the irradiation effects on materials in facilities like the International Fusion Materials Irradiation Facility (IFMIF) and, more recently, the DEMO Oriented Neutron Source (DONES), in which a considerable amount of neutrons with energies above 20 MeV is produced. The package provides: a) the activation code ANITA-IEAF, b) the activation cross section library, file “eaf2010_lib”, based on the EAF-2010 group-wise neutron activation cross section library “eaf_n_gxs_211_flt_20010” in the VITAMIN-J+ (211 energy group structure) up to 55 MeV, c) the Decay, Hazard and Clearance data library (file “fl1”) containing the quantities describing the decay properties of unstable nuclides and d) the Gamma library (file “fl2”) containing the gamma ray spectra emitted by the radioactive nuclei. The data contained in the fl1 and fl2 files are based on the JEFF-3.1.1 Radioactive Decay Data Library. Three test cases (both input and output files) are included in the code package. In this report the main characteristics of the code and the libraries, together with the description of the input and output files, are given. It can be used as the ANITA-IEAF “user’s manual”. The validation effort related to the comparison between the code predictions and the activity measurements obtained from the Karlsruhe Isochronous Cyclotron is also presented.