Abstract
Neutrons generated from thin beryllium target by 50 MeV/u 238 U beam were measured using activation analysis at 15, 30, 45, and 90 degrees from the beam direction. A 0.085 mm-thick Be stripper of RIBF was used as the neutron generating target. Activation detectors of bismuth, cobalt, and aluminum were placed out of the stripper chamber. The threshold reactions of 209 Bi(n, xn)210-x Bi(x=4~8), 59 Co(n, xn)60-x CO(x=2~5), 59 Co(n, 2nα)54 Mn, 27 Al(n, α)24 Na, and 27 Al(n,2nα)22 Na were applied to measure the production rates of radionuclides. The neutron spectra were obtained using an unfolding method with the SAND-II code. All of production rates and neutron spectra were compared with the calculated results using Monte Carlo codes, the PHITS and the FLUKA. The FLUKA results showed better agreement with the measurements than the PHITS. The discrepancy between the measurements and the calculations were discussed.
Highlights
Neutron production is one of important subjects for shielding calculation of particle accelerator facility, such as RIBF/RIKEN
The number of high energy heavy ion accelerators is small in a world
The activation analysis was applied using Bi, Co, and Al samples which were attached on the outer surface of the stripper chamber
Summary
Neutron production is one of important subjects for shielding calculation of particle accelerator facility, such as RIBF/RIKEN. The information of neutron production is very rare if the accelerated particles are heavy ions like uranium. The study to measure the neutron production yields was done using 50 MeV/u 238U beam of RIBF for the shielding design of the Rare Isotope Science Project (RISP) ion accelerator in Korea. The produced neutrons were measured when 50 MeV/u 238U beam hit thin Be using activation analysis.
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