511个keV峰高计数率在研究铽的（n，x）和（g，x）反应中的观察
Observation of 511 keV peak high count rate in studying (n,x) and (g,x) reactions on terbium
摘要：
用活化技术对Tb-159上的（n，x）和（g，x）反应进行了实验研究。用NG-300中子发生器对天然组成的Tb样品进行了（d-d）和（d-t）中子辐照。此外，还应用M-30微型电子回旋加速器作为电子源进行了一系列实验，产生端点能量为7.5、9.5、11、11.5、12、12.5、16.5和18.5 MeV的韧致辐射谱。用HPGe和Ge（Li）谱仪测量了Tb样品的仪器谱。在核反应研究和Tb样品精确γ能谱测量的主要范围内，在511 keV γ线峰处观察到高计数率。Tb样品杂质的第一优先级分析与进一步的尝试来解释的结果，观察参考的特定核性质的Tb，这可能会出现由于复杂的GDR结构。检测到的过程的能量阈值被确定为约12.2 MeV。假设并计算了该过程的截面值的较低估计值。
英文摘要：
Experimental investigation of (n, x) and (g, x) reactions on Tb-159 with activation technique was carried out. Tb specimens of natural composition were irradiated with (d-d) and (d-t) neutrons using NG-300 neutron generator. Additionally the series of experiments were performed with application of M-30 microtrone as a source of electrons for bremsstrahlung spectra production with end point energies 7.5, 9.5, 11, 11.5, 12, 12.5, 16.5, and 18.5 MeV. Instrumental spectra of Tb specimens were measured with HPGe and Ge(Li) spectrometers. Within the main scope of nuclear reactions research and accurate γ-spectrometry of Tb specimens a high count rate in 511 keV γ-line peak was observed. The first-priority analysis of Tb specimen impurities was done with further attempts to explain a result of observations with reference to the specific nuclear properties of Tb which could appear due to complex GDR structure. The energy threshold of the process detected was determined around 12.2 MeV. The lower estimate of cross section value for this process was assumed and calculated.
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