Development of Neutron Compton Scattering and Neutron Absorption Methods

中子康普顿散射和中子吸收方法的发展

• 批准号: 05504001
• 负责人: IKEDA Susumu
• 金额: $ 27.52万
• 依托单位: National Laboratory of High Energy Physics (KEK)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05504001/
• 关键词: Neutron scattering; Neutron Compton scattering; Wave function; Hydrogen bonded compounds; Neutron resonance absorption; impurity; Nondestructive testing; Microchemical analysis

Aims of this project is to develop a neutron Compton scattering spectrometer and a neutron resonance absorption spectrometer, which have been investigated, for a long time, utilizing a pulsed spallation neutron source in KEK (KENS). By the further improvements of the electric system, gamma-ray detectors and data-acquisition system in this project, we succeeded to realize these two spectrometers with good performances. Those were named as RAT and DOG,and installed in KENS.RAT spectrometer makes it possible to obtain the information about the ground state wave function psi_0r (^^*). Using the RAT,We tried to determine the space-distribution of hydrogen wavefunction in KHCO3. The obtained distribution is very similar to the theoretical distribution, which can be derived from the new model for the hydrogen bonded compounds. This result show that the hydrogen potential can be described as a superimpose of the Mose-type potential and an asymmetric potential.DOG spectrometer makes it possible to determine the concentration of the impurity and to observe the impurity motion even in the small compound. For example, using the DOG,we succeeded to determine a concentration of the impurity Sb in the semi-conductor Sb/Si and to observe the temperature dependence of the Sb-motion. The concentration of Sb was about 0.001%. Second, we observed the temperature dependence of the impurity (Ba) motion in the high-Tc compound La2-xBaxCuO4, and found a considerable large change around the Tc. Third, we observed the impurity motion under the Laser-irradiation, and studied effects of the electron-phonon interaction on the impurity. The results of those three typical studies indicate that the DOG can open a new scientific field of the 'impurity research', and that the DOG can also provide the further possibility of nondestructive testing and microchemical analysis which are very important in the industrial.

该项目的目标是利用KEK(KENS)的脉冲散裂中子源研制长期研究的中子康普顿散射谱仪和中子共振吸收光谱仪。通过对本项目中的电气系统、伽马射线探测器和数据采集系统的进一步改进，我们成功地实现了这两台性能良好的能谱仪。它们被命名为RAT和DOG，安装在KENS.RAT光谱仪上，可以获得关于基态波函数psi_0r(^^*)的信息。利用RAT，我们试图确定氢波函数在KHCO3中的空间分布。得到的分布与理论分布非常接近，这可以从氢键化合物的新模型得到。这一结果表明，氢势可以描述为Mose型势和非对称势的叠加，DOG光谱仪即使在较小的化合物中也可以确定杂质的浓度和观察杂质的运动。例如，利用DOG，我们成功地测定了半导体Sb/Si中杂质Sb的浓度，并观察到了Sb运动的温度依赖性。Sb的浓度约为0.001%。其次，我们观察了高T_c化合物La_(2-x)BaxCuO_4中杂质(BA)的运动与温度的关系，发现在T_c附近有相当大的变化。第三，我们观察了激光辐照下杂质的运动，并研究了电子-声子相互作用对杂质的影响。这三个典型研究的结果表明，狗可以开辟一个新的科学领域的‘杂质研究’，狗还可以提供进一步的可能性，无损检测和微量化学分析，这是非常重要的工业。

项目成果

Y. Wada, S. Ikeda and K. Itoh: "Incoherent Neutron Scatlering from single Cryetal RbHSO_4" J. Phys. soc. Jpn.(in press). (1996)

Y. Wada、S. Ikeda 和 K. Itoh：“单晶 RbHSO_4 的不相干中子散射”J. Phys。

T.Ueda,S.Hayashi Y.Nakai and S.Ikeda: "Phys.Rev.B 51" Local structure in b-TiHV studied by inelestic Neutron scattering, 5725 (1995)

T.Ueda、S.Hayashi Y.Nakai 和 S.Ikeda：“Phys.Rev.B 51”通过非弹性中子散射研究 b-TiHV 中的局域结构，5725 (1995)

S. Ikeda ad Y. Yamada: "Phase transition in hydrogen bonded ferro electric Compounds" Physca B. 213-214. 652- (1995)

S. Ikeda 和 Y. Yamada：“氢键铁电化合物中的相变”Physca B. 213-214。

S.Ikeda: "Hydrogen potentials in Hydrogen bonded compounds" Physica B. (in press). (1996)

S.Ikeda：“氢键化合物中的氢势”Physica B.（正在出版）。

S. Ikeda: "Hydrogen potentials in Hydrogen bonded compounds" Physica B. (in press). (1996)

S. Ikeda：“氢键化合物中的氢势”Physica B.（正在出版）。