Characterization of high-energy quasi-monoenergetic neutron energy spectra and ambient dose equivalents of 80–389 MeV 7Li(p,n) reactions using a time-of-flight method

Characterization of Hundreds of MeV 7Li(p,n) Quasi-Monoenergetic Neutron Source at RCNP Using a Proton Recoil Telescope and TOF Technique

“…The both data were not dependent on the incident proton energy and constant to be about 1 × 10 10 sr -1 C -1 . Peak cross section at 0° of 7 Li(p,n) reaction in LAB system in this study, our previous study [5], Baba et al [7], Watoson et al [8], and Taddeuchi et al [9]. The cross section for the peak neutron production, 7 Li(p,n 0,1 ) 7 Be, was deduced to compare with the experimental data measured by the other facilities.…”

“…Each measurement for polyethylene, carbon and blank radiators was done for 1-2 hours with the proton beam current of 1-3 μA Three data (ΔE, E and TOF) were processed event by event using conventional NIM and CAMAC electronics. The data taking system was almost the same as that used in the previous measurements [5]. The light outputs of ΔE and E detectors were taken with a charge-sensitive analog-to-digital converter (ADC) and TOF was taken with a time-to-digital converter (TDC).…”

“…For data analysis of these experiments, the intensity and the energy spectrum of the neutron source should be known accurately. We have measured the energy spectra of the 7 Li(p,n) neutron source with a time-of-flight (TOF) method employing an organic liquid scintillator (NE213) for incident proton energies between 80 and 389 MeV in the previous study [5]. The accuracy of the measured data was limited by that of the detection efficiency determination (~15%) with a Monte-Carlo method, because the detection efficiency of NE213 is rather uncertain in this energy region due to the neutron-carbon interaction in the scintillator and the light outputs of the reaction products which are not sufficiently known.…”

Single Event Effect cross section calibration and application to quasi-monoenergetic and spallation facilities

“…At the Research Center for Nuclear Physics (RCNP), quasimonoenergetic neutron beams in the 80-400 MeV range are provided through the 7 Li(p,xn) reaction [16]. A 1 cm thick enriched Li target is used to produce the neutrons.…”

“…4. RCNP spectra for 100 and 296 MeV as measured through the NE213 TOF technique [16]. absorb the thermal neutrons by means of the roughly 7000 b associated capture cross section.…”