Study of satellite structure of the rare-earth Lγ x rays reflecting many-electron effect of 4f-electronic state

反映4f电子态多电子效应的稀土Lγx射线卫星结构研究

• 批准号: 14550051
• 负责人: ITO Shin
• 金额: $ 1.79万
• 依托单位: Kinki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550051/
• 关键词: 4f electron; rare earth; Lγ x ray; satellite structure; many-electron effect; heavy-ion impact; multiple ionization

1.Lγ x-ray measurement of the rare-earth elements in proton bombardment :(1)The rare-earth targets of Gd,Tb,and Dy were bombarded with 2-9 MeV proton beams. High-resolution measurement of Lγ x rays was made. The results showed that the measured spectrum profiles of Lγ x rays were identical within the experimental energy resolution of about 11 eV(FWHM) as compared with the data obtained with x-ray or electron excitation.(2)Theoretical calculations were made for the multiple ionization probability, the mean energy transfer and its straggling, and recoil energy. The results lead to the conclusions that the influence of the recoil effect on the 4f electrons is too small to generate change in Lγ x-ray spectrum in the present bombarding energies, however, there is a possibility to find the recoil effect below 1 MeV.2.Basic performance of PSPC :(1)The PSPC was improved to get higher x-ray detection efficiency. In this procedure, the phenomenon of position-peak splitting was found. Since the phenomenon may give rise to deterioration of position(energy) resolution of the present work, the mechanism of the phenomenon was studied in detail. The results will be reported in publication.

1.L质子轰击稀土元素的γX射线测量：(1)用2-9 MeV的质子束轰击Gd、Tb、Dy的稀土靶材。对LγX射线进行了高分辨率测量。结果表明，在约11 eV(半高宽)的实验能量分辨率范围内，测量到的LγX射线的能谱分布与用X射线或电子激发得到的数据一致。(2)对多重电离几率、平均能量转移及其散布和反冲能进行了理论计算。结果表明，在目前的轰击能量下，反冲效应对4f电子的影响很小，不会引起LγX射线能谱的变化，但在1 MeV以下仍有可能发现反冲效应。在这个过程中，发现了位置-峰分裂现象。由于该现象可能导致本工作的位置(能量)分辨率下降，因此对该现象的机理进行了详细的研究。结果将在出版物上公布。

项目成果

T.Horiguchi: "Basic performance of a pressurized backgammon-type position-sensitive proportional counter for thermal neutrons"Nuclear Instruments and Methods A. in press.

T.Horiguchi：“热中子加压西洋双陆棋型位置敏感正比计数器的基本性能”核仪器和方法 A. 已出版。

T.Horiguchi et al.: "Basic performance of a pressurized backgammon-type position-sensitive proportional counter for thermal neutrons"Nuclear Instruments and Methods A. (in press).

T.Horiguchi 等人：“热中子加压西洋双陆棋型位置敏感正比计数器的基本性能”核仪器和方法 A.（出版中）。

T.Horiguchi: "Basic performance of a pressurized backgammon-type position-sensitive proportinal counter for thermal neutrons"Nuclear Instruments and Methods A. (in press).

T.Horiguchi：“热中子加压西洋双陆棋型位置敏感比例计数器的基本性能”核仪器和方法 A.（出版中）。