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Development of a 4pi position-sensitive detectors and a study on the measurement of nuclear-reaction cross sections induced by polarized neutrons in the energy region around MeV

4pi位敏探测器研制及MeV附近极化中子诱发核反应截面测量研究

基本信息

批准号：
06680470
负责人：
MATOBA Masaru
金额：
$ 1.47万
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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

In the present research, a charged particle counter-telescope system with wide angular acceptance has been developed for the investigation of the double differential cross section of neutron-induced nuclear reactions. The counter-telescope system is capable of identification of particle sorts, measurement of the total energy and ray-tracing of the passing path.As a part of this counter-telescope system, a two-dimensional position-sensitive gas counter was newly designed and constructed. In this gas counter, two-dimensional position sensing is achieved with a combination of two different methods for each axis ; one is the charge division method with a backgammon-shaped electrode and the other method is besed on the measurement of electron drift time. The sensitive area is about 100x100 mm^2 and the inherent position resolution has been estimated at 0.75 mm in FWHM.This position-sensitive gas counter has transmission capability. Therefore, angle determination of passing particles is available by the ray-tracing when several such detectors are stacked.A SSD,48x48 mm^2 sensitive area and 300 mum thickness, was put behind the ray-tracing system to measure the total energy of incident charged particles. A personal-computer based data-acquisition system has been developed with CAMAC electronics. On-line data analysis is possible in this data-acquisition system.Finally, the practicability of this counter-telescope system was successfully demonstrated at the Tandem Accelerator facility of Kyushu university using about 9 MeV protons which were elastically scattered from a polyethylene target by the neutron beam.

在目前的研究中，开发了一种具有宽接收角的带电粒子反望远镜系统，用于研究中子诱发核反应的双微分截面。该反望远镜系统能够识别粒子种类、测量总能量以及对通过路径进行射线追踪。作为该反望远镜系统的一部分，新设计并构建了二维位置敏感气体计数器。在该气体计数器中，每个轴结合两种不同的方法实现了二维位置传感；一种是采用双陆棋形状电极的电荷分配方法，另一种方法是基于电子漂移时间的测量。敏感区域约为 100x100 mm^2，固有位置分辨率在 FWHM 中估计为 0.75 mm。该位置敏感气体计数器具有传输能力。因此，当多个此类探测器堆叠在一起时，可以通过射线追踪来确定通过粒子的角度。在射线追踪系统后面放置一个敏感区域为48x48 mm^2、厚度为300μm的SSD，用于测量入射带电粒子的总能量。 CAMAC electronics 开发了基于个人计算机的数据采集系统。该数据采集系统可以进行在线数据分析。最后，在九州大学的串联加速器设施中，利用中子束从聚乙烯靶上弹性散射的约 9 MeV 质子，成功证明了该反望远镜系统的实用性。