Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons

LI Yan-Yan; ZHANG Xue-Ying; JU Yong-Qin; MA Fei; ZHANG Hong-Bin; CHEN Liang; GE Hong-Lin; WAN Bo; LUO Peng; ZHOU Bin; ZHANG Yan-Bin; LI Jian-Yang; XU Jun-Kui; WANG Song-Lin; YANG Yong-Wei; YANG Lei

doi:10.1088/1674-1137/39/4/044001

Chinese Physics C> 2015, Vol. 39> Issue(4) : 044001 DOI: 10.1088/1674-1137/39/4/044001

Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons

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Spallation neutrons were produced by the irradiation of Pb with 250 MeV protons. The Pb target was surrounded by water which was used to slow down the emitted neutrons. The moderated neutrons in the water bath were measured by using the resonance detectors of Au, Mn and In with a cadmium (Cd) cover. According to the measured activities of the foils, the neutron flux at different resonance energies were deduced and the epithermal neutron spectra were proposed. Corresponding results calculated with the Monte Carlo code MCNPX were compared with the experimental data to check the validity of the code. The comparison showed that the simulation could give a good prediction for the neutron spectra above 50 eV, while the finite thickness of the foils greatly effected the experimental data in low energy. It was also found that the resonance detectors themselves had great impact on the simulated energy spectra.

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LI Yan-Yan, ZHANG Xue-Ying, JU Yong-Qin, MA Fei, ZHANG Hong-Bin, CHEN Liang, GE Hong-Lin, WAN Bo, LUO Peng, ZHOU Bin, ZHANG Yan-Bin, LI Jian-Yang, XU Jun-Kui, WANG Song-Lin, YANG Yong-Wei and YANG Lei. Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons[J]. Chinese Physics C, 2015, 39(4): 044001. doi: 10.1088/1674-1137/39/4/044001

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Received: 2014-09-04
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons

Corresponding author: ZHANG Xue-Ying,

Received Date: 2014-09-04

Accepted Date: 1900-01-01

Available Online: 2015-04-05

Abstract: Spallation neutrons were produced by the irradiation of Pb with 250 MeV protons. The Pb target was surrounded by water which was used to slow down the emitted neutrons. The moderated neutrons in the water bath were measured by using the resonance detectors of Au, Mn and In with a cadmium (Cd) cover. According to the measured activities of the foils, the neutron flux at different resonance energies were deduced and the epithermal neutron spectra were proposed. Corresponding results calculated with the Monte Carlo code MCNPX were compared with the experimental data to check the validity of the code. The comparison showed that the simulation could give a good prediction for the neutron spectra above 50 eV, while the finite thickness of the foils greatly effected the experimental data in low energy. It was also found that the resonance detectors themselves had great impact on the simulated energy spectra.

Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons

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Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons

Corresponding author: ZHANG Xue-Ying,

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