The activation of Zr-nat by quasi-monoenergetic neutrons below 34 MeV.

0542159 - ÚJF 2022 RIV FR eng C - Conference Paper (international conference)
Šimečková, Eva - Ansorge, Martin - Bém, Pavel - Majerle, Mitja - Mrázek, Jaromír - Novák, Jan - Štefánik, Milan
The activation of Zr-nat by quasi-monoenergetic neutrons below 34 MeV.
EPJ Web of Conferences. Vol. 239. Les Ulis: E D P Sciences, 2020, č. článku 20005. ISBN 978-2-7598-9106-1. ISSN 2100-014X.
[International Conference on Nuclear Data for Science and Technology (ND2019). Beijing (CN), 19.05.2019-24.05.2019]
R&D Projects: GA MŠMT(CZ) EF16_013/0001679; GA MŠMT LM2015076
Research Infrastructure: SPIRAL2-CZ - 90076
Institutional support: RVO:61389005
Keywords : cross section * Time-Of-Flight * nuclear spectrometry method
OECD category: Nuclear physics

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 Li-7 (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 Zr-nat(n,*)Zr-89m,Zr-89g,Zr-89, (87m,87,88,89m,90m,91m,92,93,94,95)y and Sr-87m,Sr-91,Sr-92 were obtained and cross sections were extracted. The preliminary results are discussed.
Permanent Link: http://hdl.handle.net/11104/0319635