Measurement and Calculation of High-Energy Reflected Neutrons from Aluminum

LU Xin-Xin; LIU Rong; JIANG Li; WANG Mei; LIN Ju-Fang; WEN Zhong-Wei; ZHU Tong-Hua; WANG Da-Lun

Chinese Physics C> 2007, Vol. 31> Issue(5) : 448-451

Measurement and Calculation of High-Energy Reflected Neutrons from Aluminum

Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China

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Abstract：
Using six different high-threshold neutron-activation detectors, the activation reaction rates are obtained with and without the Al reflector. Measured reflectivities of high-energy neutrons from Al reflector are also obtained as the ratio of measured data and range from 1 to 1.14. For different activation detectors, the shape of the reflectivities as function of measurement angles is rather similar. The intensity of the reflected high-energy neutron field is high at large angles and smaller towards smaller angles. With increasing thresholds of the activation detectors, the reflectivities decrease. Evaluated total uncertainties of reflectivities are 3.4%—4.2%. Calculated results of reflectivities agree with the experimental results at the majority of the measuring points.

References

[1]

. Walter Meyer, Leighty J W, Thiesing J W. Nuclear Scienceand Engineering, 1976, 60: 4052. Monahan S P. The Neutron Physics of Concrete Reec-torsμLA-UR-95-2196. USA: LA, 19953. LIU Rong, LIN Li-Bin,WANG Da-Lun et al. Nuclear Tech-niques, 2000, 23(12): 851 4. LIU Rong, JIANG Li, WANG Mei et al. Nuclear Electron-ics Detection Technology, 2001, 21(4): 2415. LU Xin-Xin, LIU Rong, JIANG Li et al. Nuclear Electron-ics Detection Technology, 2005, 25(1): 106 6. LU Xin-Xin, LIU Rong, WANG Mei et al. Nuclear Tech-niques, 2004, 27(8): 591

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LU Xin-Xin, LIU Rong, JIANG Li, WANG Mei, LIN Ju-Fang, WEN Zhong-Wei, ZHU Tong-Hua and WANG Da-Lun. Measurement and Calculation of High-Energy Reflected Neutrons from Aluminum[J]. Chinese Physics C, 2007, 31(5): 448-451.

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Received: 2006-08-21
Revised: 2006-09-18

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement and Calculation of High-Energy Reflected Neutrons from Aluminum

Corresponding author: LU Xin-Xin,

Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China

Received Date: 2006-08-21
Accepted Date: 2006-09-18
Available Online: 2007-05-05

Abstract: Using six different high-threshold neutron-activation detectors, the activation reaction rates are obtained with and without the Al reflector. Measured reflectivities of high-energy neutrons from Al reflector are also obtained as the ratio of measured data and range from 1 to 1.14. For different activation detectors, the shape of the reflectivities as function of measurement angles is rather similar. The intensity of the reflected high-energy neutron field is high at large angles and smaller towards smaller angles. With increasing thresholds of the activation detectors, the reflectivities decrease. Evaluated total uncertainties of reflectivities are 3.4%—4.2%. Calculated results of reflectivities agree with the experimental results at the majority of the measuring points.