Total neutron cross-section extracted from transmission experiments with liquid oxygen using neutron energies from 18 to 27 MeV

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.

The characterization of the collimated beams of fast neutrons with the clid detection system

“…An independent measurement with the NE213 scintillator in the ToF mode was performed to obtain the neutron spectral flux at the irradiation position of the CLID. The methodology of the TOF measurement is beyond the scope of this paper [21,22]. The resulting ToF neutron spectrum is shown in Figure 8 for comparison.…”