高效率Be过滤探测器中子非弹性散射谱仪  

A Beryllium Filter Spectrometer With High Efficiency for Neutron Inelastic Scattering

作　　者：阮景辉 牛世文 曾祥欣 王军[1] 成之绪 程玉芬 勾成[1] 郭立平 林军 俞安孙 沈志功 柯永丰 张泮林 严启伟[1] 

机构地区：[1]中国原子能科学研究院,中国科学院物理研究所

出　　处：《高能物理与核物理》1996年第6期498-504,共7页High Energy Physics and Nuclear Physics

摘　　要：在中国原子能科学研究院重水堆水平孔道旁，建立了高效率的Ｂｅ过滤探测器中子非弹性散射谱仪，首次研制了具有宽的接受角（～３０°）和聚焦安排的新型Ｂｅ过滤器，使探测效率提高３倍以上，同时也克服了一般Ｂｅ过滤谱仪在低能段相干散射的影响．本谱仪还通过具有特殊取向的Ｇｅ单色器的不同晶面的自动转向，拓宽了测量的能量范围（１０—４００ｍｅＶ），并有较好的能量分辨率（４％—９％）．在此谱仪上对ＺｒＨ１．６和ＰｄＨ０．５８的光学振动模以及高Ｔｃ超导材料ＹＢａ２Ｃｕ３Ｏ６＋ｘ的全频谱进行了测试，观察出奇异的结构峰、高频模和反常的散射强度，表明本谱仪不仅效率高而且还具有优良的物理性能，可以在中等通量水平的反应堆上开展广泛的热中子非弹性散射研究．A beryllium filter detector spectrometer with high efficiency for neutron inelastic scattering has been built beside the horizontal channel of heavy water reactor in China Institute of Atomic Energy.It is the first time to develope a new type of beryllium filter with a wide receiving angle(～30°)and focus arrangement of beryllium blocks.The detecting efficiency of the spectrometer is raised at least by a factor of three.Furthermore,the influence of coherent scattering upon experiments has also been eliminated in the range of low energy.By automatic rotating of different crystal planes of Ge monochromator which possesses particular orientation the measurable energy range of the spectrometer has been widened(from 10 to 400meV)and the energy resolution improved (4%-9%).On this spectrometer,we have measured the optical vibrational modes for ZrH1.6 and PdH0.58 and the total spectrum of the high-temperature superconducting material YBa2Cu3O(6+x)and observed its unusual structural peaks, high frequency modes and anomalous scattering intensities.It has been shown that the spectrometer not only is efficient but also possesses an excellent physical capability.So it is possible to carry out extensive research on inelastic thermal neutron scattering on a medium-flux reactor.

关 键 词：非弹性散射 中子谱仪 探测器 过滤器 

分 类 号：TL817.3[核科学技术—核技术及应用]