INVESTIGATION ON HIGH-RESOLUTION RADIATION-DETECTORS BY THE USE OF Nb-BASED TUNNEL JUNCTIONS

利用铌基隧道结研究高分辨率辐射探测器

• 批准号: 02680187
• 负责人: ISHIBASHI Kenji
• 金额: $ 1.41万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02680187/
• 关键词: SUPERCONDUCTING TUNNEL JUNCTION; RADIATION; X RAY; NIOBIUM; ALUMINUM; PHOTOLITHOGRAPHY; フォトリソグラフィ-; 放射線検出器; x線検出器; 二オブ; 準粒子

It has been presumed that superconducting tunnel junctions for radiation detection show better energy resolution than semiconductor detectors. We made a basic research for applying niobium-based tunnel junctions to radiation detection.Nb/A1-A10x/Nb junctions of a simple structure was fabricated by photolithographic technique, and 5.9 keV X-ray was measured by them. Non-linear interaction between quasi-particles and phonons was analyzed by the coupled Boltzmann equations, and the behavior of quasiparticles and phonons in the superconductor was elucidated.In order to obtain better energy resolution under the present technical constraint, a study was made on the design method for the optimum niobium-based tunnel junctions. It was found that there exists an optimum value of normal resistance: The energy resolution is deteriorated when junctions have the normal resistance different from the optimum value.Finally, discussion about advanced tunnel junctions was made from the viewpoint of both multilayer tunnel junctions and materials suitable for radiation detection.

据推测，用于辐射探测的超导隧道结显示出比半导体探测器更好的能量分辨率。为铌基隧道结在辐射探测中的应用做了基础性的研究，采用磁控溅射技术制备了结构简单的Nb/A1-A10x/Nb结，并进行了5.9keV的X射线测量。利用耦合Boltzmann方程分析了准粒子与声子之间的非线性相互作用，阐明了准粒子和声子在超导体中的行为，研究了在现有技术条件下，为获得更好的能量分辨率，最佳超导体隧道结的设计方法.发现结的法向电阻存在一个最佳值，当结的法向电阻与最佳值不同时，能量分辨率变差.最后，从多层隧道结和适用于辐射探测的材料两个方面对先进隧道结进行了讨论.

项目成果

K.Ishibashi Y.Matsumoto: "Quasiparticle Disappearance in Superconducting Tunnel Junctions for X-Ray Defection" Nucl.Instr.Methods Phys.Res.

K.Ishibashi Y.Matsumoto：“X 射线缺陷超导隧道结中的准粒子消失”Nucl.Instr.Methods Phys.Res。

Kenji Ishibashi: "Output Signal from Nbーbased Tunnel Junctions by Irradiation of 6 keV xーrays" IEEE Trans.Magn.27. (1991)

Kenji Ishibashi：“通过 6 keV X 射线照射从铌基隧道结输出信号”IEEE Trans.Magn.27 (1991)。

Kenji Ishibashi: "Cryogenic Radiation Detectors by the Use of Niobium-Based Tunnel Junctions" Oyo Butsuri (in Japanese). 60. 712-715 (1991)

Kenji Ishibashi：“使用铌基隧道结的低温辐射探测器”Oyo Butsuri（日语）。

Kenji Ishibashi: "Output Signal from X-Ray Irradiated Nb-Based Tunnel Junctions and Its Analysis on the Basis on the Coupled Boltzman Equations" X-Ray Detection by Superconducting Tunnel Junctions(World Scientific). 151-164 (1991)

Kenji Ishibashi：“X 射线照射铌基隧道结的输出信号及其基于耦合玻尔兹曼方程的分析”超导隧道结的 X 射线探测（World Scientific）。

石橋 健二: "ニオブ系トンネル接合を用いた極低温放射線検出器" 応用物理. 60. 712-715 (1991)

Kenji Ishibashi：“使用铌基隧道结的低温辐射探测器”应用物理 60. 712-715 (1991)。