A Beryllium Filter Spectrometer With High Efficiency for Neutron Inelastic Scattering

Ruan Jinghui; Niu Shiwen; Zeng Xiangxin; Wang Jun; Cheng Zhixu; Cheng Yufen; Gou Cheng; Guo Liping; Lin Jun; Yu Ansun; Shen Zhigong; Ke Yongfeng; Zhang Panlin; Yan Qiwei

Chinese Physics C> 1996, Vol. 20> Issue(6) : 498-504

A Beryllium Filter Spectrometer With High Efficiency for Neutron Inelastic Scattering

China Institute of Atomic Energy,Beijing 1024132 Institute of Physics,The Chinese Academy of Sciences,Beijing 100080

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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 ZrH_1.6 and PdH_0.58 and the total spectrum of the high-temperature superconducting material YBa₂ Cu₃ O_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.

References

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阮景辉等，高能物理与核物理，5（1978）441.[2]D.K.Ross et al,Zeitschrift fur Physikalische Chemie Neue Folge,Bd.114（1979）221.[3]陈桂英等，物理学报，（1980）257.[4]阮景辉等，物理学报，3（1986）389.[5]F.Gompf et al.,Proceedings of the Third International Conferenceon Phonon Physics and the Sixth International Conference on Phonon Scattering in Condesed Matter.,Vol.1（1990）307.[6]P.P.Parshin et al.,Proceedings of the Third International Conferenceon Phonon Physics and the Sixth International Conferenceon Phonon Scattering in Condensed Matter.,Vol.1（1990）310.[7]阮景辉等，物理学报，7（1993）1121;Ruan Jinghui et al.,Physics Letters,A187（1994）107.

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Ruan Jinghui, Niu Shiwen, Zeng Xiangxin, Wang Jun, Cheng Zhixu, Cheng Yufen, Gou Cheng, Guo Liping, Lin Jun, Yu Ansun, Shen Zhigong, Ke Yongfeng, Zhang Panlin and Yan Qiwei. A Beryllium Filter Spectrometer With High Efficiency for Neutron Inelastic Scattering[J]. Chinese Physics C, 1996, 20(6): 498-504.

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Received: 1900-01-01
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沈阳化工大学材料科学与工程学院沈阳 110142

A Beryllium Filter Spectrometer With High Efficiency for Neutron Inelastic Scattering

Corresponding author: Ruan Jinghui,

China Institute of Atomic Energy,Beijing 1024132 Institute of Physics,The Chinese Academy of Sciences,Beijing 100080

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1996-06-05

Abstract: 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 ZrH_1.6 and PdH_0.58 and the total spectrum of the high-temperature superconducting material YBa₂ Cu₃ O_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.

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A Beryllium Filter Spectrometer With High Efficiency for Neutron Inelastic Scattering

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