The emission spectra of NaD2O, InBe, LaBe and NaBe photoneutron sources

Journal of Nuclear Energy Pub Date : 1973-12-01 DOI:10.1016/0022-3107(73)90031-2

K. Mueck, F. Bensch

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引用次数: 6

Abstract

The energy distribution of the photoneutrons of NaD₂O, InBe, LaBe and NaBe source systems were measured by means of a proton-recoil proportional counting tube. Spherical lead-shields of various thicknesses (ranging from 1·5 to 13 cm) were used to reduce the intense gamma field accompanying the neutron spectra to be measured. The spectra of spherical heterogeneous source arrangements for three different Be-target thicknesses (0·5, 1· and 2·0 cm) were measured and compared with the theoretical distribution as obtained by Monte-Carlo calculations. The change in spectrum shape due to the lead shields was also calculated by a Monte-Carlo routine. Good agreement between theoretical predictions and experimental results shows values for the peak of the neutron distribution of 264·1 ± 0·5 keV for the NaD₂O system, 397·3 ± 0·8 keV for the InBe system, 761·7 ± 0·7 keV for the LaBe system, and 966·9 ± 0·5 keV for the NaBe source system. With the LaBe system a second neutron group of much lower intensity (6·5 per cent of the main group) could be found with a peak energy of 1097·5 +- 1·0 keV in good agreement to recent gamma-spectroscopic measurements.

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NaD2O、InBe、LaBe和NaBe光子中子源的发射光谱

用质子反冲比例计数管测量了NaD2O、InBe、LaBe和NaBe源体系的光子中子能量分布。采用不同厚度(1.5 ~ 13 cm)的球形铅屏蔽层来减弱伴随待测中子能谱的强伽马场。测量了三种不同be靶厚度(0·5、1·和2·0 cm)的球形非均质源排列的光谱，并与蒙特卡罗计算得到的理论分布进行了比较。由铅屏蔽引起的光谱形状的变化也通过蒙特卡罗程序计算出来。理论预测与实验结果吻合较好，NaD2O系统的中子分布峰值为264·1±0.5 keV, InBe系统为397.3±0.8 keV, LaBe系统为761·7±0.7 keV, NaBe源系统为966·9±0.5 keV。在LaBe系统中，可以发现强度低得多的第二个中子群(占主群的6.5%)，峰值能量为1097·5 +- 1·0 keV，这与最近的伽玛光谱测量结果很吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Nuclear Energy

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