Neutron spectra produced by 30, 35 and 40 MeV proton beams at KIRAMS MC-50 cyclotron with a thick beryllium target

Measurements of 89Y(n,2n)88Y and 89Y(n,3n)87Y, 87mY cross sections for fast neutrons at KIRAMS

“…of Ref. [12]. This 10% difference in the experimental and calculated activities may be traced to the uncertainty in the neutron flux.…”

“…Figure 4 of Ref. [12] shows that the magnitude of the neutron flux simulated by GEANT4 increases with the energy of the incident proton beam. However, it is remarkable that the neutron spectra are rather flat at neutron energies above 5 MeV and then drop sharply at the neutron energies close to the incident proton energies.…”

Measurements of cross sections for the 209Bi(n, 4n) reaction by using high energy neutrons with continuous energy spectra

“…1 of Ref. [9]. Neutrons were produced by directing 30, 35 and 40 MeV proton beams of 20µA to a beryllium target of thickness 1.05 cm.…”

“…In [9] simulations for the neutron spectra scored at the sample position was conducted. We adopted the simulation results of the neutron spectra given in [9], where the GEANT4 code v10.0 [10] was used with the newly developed hadronic model [11] that takes the ENDF/B-VII.1 data for the 9 Be(p, n) 9 B cross section.…”

“…We adopted the simulation results of the neutron spectra given in [9], where the GEANT4 code v10.0 [10] was used with the newly developed hadronic model [11] that takes the ENDF/B-VII.1 data for the 9 Be(p, n) 9 B cross section. The angular dependence of the neutron spectra is almost independent of angles when θ < 5 • , where θ is the angle of the neutron momentum with respect to the proton beam axis.…”