Study of neutron fluence rate fluctuation factor in nuclear reaction cross section measurement

Study of neutron fluence rate fluctuation factor in nuclear reaction cross section measurement
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核反应截面测量中子注量率波动因素研究

DOI:
10.1007/s10967-014-2934-3
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发表时间:
2014-01
影响因子:
1.6
通讯作者:
Junhua Luo
Junhua Luo
中科院分区:
化学4区
文献类型:
--
作者:
Junhua Luo

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根据人工放射性核素的生长和衰变规律,得出了中子注量率波动对中子辐照样品测量放射性的修正公式。这是基于T(d,n)4He反应产生的14 MeV单能中子的注量。结合实际测量的伴生α粒子的计数和能谱,对不同辐照时间下不同的半衰期、中子注量率波动因子进行了计算和讨论。实验结果表明,在中子感生反应截面测量中,样品的辐照时间应小于或接近被测反应子核的半衰期,以使涨落因子的校正值接近1。
The correction formula for the neutron fluence rate fluctuation on the measured radioactive of the neutron irradiated sample was obtained based on the regulation of growing and decay of artificial radioactive nuclide. This was done based on the fluence of the 14 MeV mono-energetic neutron generated by T(d,n)4He reaction. Combining with the actual measured counts and spectra of the accompanying alpha-particles, for the different irradiating time, the different half-life, neutron fluence rate fluctuation factor was calculated and discussed. The experimental results show that in the cross section measurement of neutron-induced reactions, the irradiation time of the samples should be less than or close to the half-life period of the daughter nucleus of the measured reaction such that the corrected values of the fluctuation factors are close to one.
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