Neutron Productions from thin Be target irradiated by 50 MeV/u 238U beam
1 Pohang Accelerator Laboratory, POSTECH, Pohang 37673, Republic of Korea
2 Division of Advanced Nuclear Engineering, POSTECH, Pohang 37673, Republic of Korea
3 Institue of Technology, Shimizu Corporation, Tokyo, Japan
4 RIKEN, Wako, Japan
* Corresponding Author, E-mail: firstname.lastname@example.org
Published online: 25 September 2017
Neutrons generated from thin beryllium target by 50 MeV/u 238U 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 209Bi(n, xn)210-xBi(x=4~8), 59Co(n, xn)60-xCO(x=2~5), 59Co(n, 2nα)54Mn, 27Al(n, α)24Na, and 27Al(n,2nα)22Na 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.
Key words: 238U beam / Be / Activation analysis / Neutron spectrum
© The Authors, published by EDP Sciences, 2017
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