Eva Simeckova

NEUTRON FIELD MEASUREMENT OF P(35)+Be SOURCE USING THE MULTI-FOIL ACTIVATION METHOD

Neutron field from the p+Be interaction was investigated at the NPI CAS for a proton beam energy of 35 MeV and thick beryllium target. Broad neutron spectra at close source-to-sample distances were determined using the multi-foil activation technique. Two large sets of dosimetry foils containing the Ni, Co, Au, In, Ti, Al, Y, Lu, Nb and Fe were irradiated at a distance of 74 mm at direct neutron beam axis and at a distance of 34 mm from beam axis. Supporting Monte-Carlo MCNPX calculations of the irradiation system were performed as well. From measured reaction rates, the neutron energy spectra at both positions were reconstructed employing the modified version of the SAND-II unfolding code and activation cross-section data from the EAF-2010 library. At the position of irradiated samples, the total fast neutron flux reaches the value up to 1010 cm-2 s-1, and the neutron field is utilizable for radiation hardness study and integral benchmark experiments within the International Fusion Material Irradiation Facility (IFMIF) program.

CROSS SECTIONS MEASURED BY QUASI-MONOENERGETIC NEUTRONS

197Au, 209Bi, 59Co, natFe and 169Tm samples were irradiated several times with quasi-monoenergetic neutrons from the p+7Li reaction in the energy range of 18-34 MeV. The activities of the samples were measured with the HPGe detector and the reaction rates were calculated. The cross sections were extracted using the SAND-II code with the reference cross sections from the IRDFF database.

Accelerator driven p(37)-D 2 O fast neutron source at NPI Řeř

In the article, the fundamental information on the neutron production in the D(p,n)2p reaction is summarized, and the measurements at research facilities dealing with such types of source are described. The details about the experimental study of p + D2 and p + D2O reactions and corresponding neutron source development at the NPI in Řež are provided. The accelerator driven fast neutron generator NG-2 based on p(37) + D2O source reaction with a broad neutron spectrum up to 34 MeV is characterized, and the neutron field determined by the multi-foil activation technique validated against the Monte Carlo MCNPX calculations is presented. The research programs realized in this neutron field, commonly used for experimental simulation of the IFMIF (International Fusion Material Irradiation Facility) spectrum, are outlined.