Abstract
Fast neutron generators driven by isochronous cyclotron U-120M developed at Nuclear Physics Institute were used for neutron cross-section measurements. The target station with 2 mm thin lithium was used to produce pulsed beams of fast quasi-monoenergetic neutrons in the 7Li(p,n) reaction. The Time-of-Flight technique was used to determine the exact neutron energy spectra. The transmission measurements on liquid oxygen were conducted for several neutron peak energies between 18 and 27 MeV and the cross-sections for reaction natO(n,tot) were derived.
Highlights
The total cross-section natO(n,tot) for reactions induced by fast neutrons is an important quantity for designing future energy facilities, where high fluxes of fast neutrons will be present together with sufficient amount of oxygen nuclei
In recent years a series of transmission experiments has been conducted at the Nuclear Physics Institute (NPI) of the CAS at U-120M cyclotron facility, operated with the support of CANAM project
The collimator was used during the transmission measurements and contributed significantly to the precision of the final results
Summary
The total cross-section natO(n,tot) for reactions induced by fast neutrons is an important quantity for designing future energy facilities, where high fluxes of fast neutrons will be present together with sufficient amount of oxygen nuclei. In the energy region from 18 to 35 MeV precise experimental data are still rare, making space for new additional transmission experiments with oxygen nuclei. Present results should improve the correctness of data evaluations and contribute to all projects and researches where crosssection natO(n,tot) is not a negligible factor. The Accelerator Driven Systems (ADS) and future fusion-based facilities can be stated as relevant examples. In recent years a series of transmission experiments has been conducted at the Nuclear Physics Institute (NPI) of the CAS at U-120M cyclotron facility, operated with the support of CANAM project. Fast neutron generators based on the interaction of protons with thin 7Li were used together with Time-Of-Flight (TOF) technique based detection method
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