Abstract
Good knowledge of cross section neutron induced reactions on Zr becomes of importance due to the use of zirconium as structural material in reactors, its applicability in neutron dosimetry and the theoretical model testing. Thin Zr foils (0.05 mm thickness, 99.2% purity) were irradiated in the quasi-monoenergetic p-Li neutron fields, the proton beams from NPI CAS variable-energy cyclotron U120M at proton energies 20.33, 22.44, 24.69, 27.64, 29.85, 32.31 and 35.11 MeV. Li target with carbon stopper was used for the generation of neutron flux. The reaction 7Li (p,n) produces the high-energy quasi-monoenergetic neutrons with a tail to lower energies. The flux density and neutron spectra were evaluated by MCNPX code and validated with set of measurements including Time-Of-Flight and Proton recoil Telescope and additional activation monitors. The pneumatic tranfer system enables the investigation of short living isotopes. The foil activity determination was performed by the nuclear spectrometry method employing two calibrated HPGe detectors. The reaction rates for natZr(n,*)89m,89g,89Zr, 87m,87,88,89m,90m,91m,92,93,94,95Y and 87m,91,92Sr were obtained and cross sections were extracted. The preliminary results are discussed.
Highlights
Zirconium is an important reactor material, but till recently its cross section database, especially for neutron treshold reactions, was rather weak
The standard 7Li(p,n) reaction on a thin lithium target induced by 20-35 MeV proton beam from the variable-energy cyclotron U120M was used for the production of quasi-monoenergetic neutron field
A selfsupporting Li target cooled by 5◦C alcohol stream and a carbon stopper were utilized
Summary
Zirconium is an important reactor material, but till recently its cross section database, especially for neutron treshold reactions, was rather weak. The available data mostly covered the energy region up to 15 MeV. The excitation functions of neutron threshold reactions are of the considerable interest for testing of nuclear models. The theoretical description of (n,p) and (n,α) reactions on Zr isotopes was recently done in Ref. The Fast Neutron Generator (FNG) facility at the NPI CAS variableenergy cyclotron U120M provides quasi-monoenergetic neutron fields in the region of 16 - 34 MeV (see [2])
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