The Measurement of the Gluon Spin Polarization in Nucleon

核子中胶子自旋极化的测量

• 批准号: 09044072
• 负责人: HORIKAWA Naoaki
• 金额: $ 18.18万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044072/
• 关键词: spin; nucleon spin structure; COMPASS; polarized target; quark spin; gluon spin; QCD; muon beam; SMC; クォークスピン; グルーオンスピ; グル-オンスピン

In these three years, we concentrated to the preparation of the COMPASS experiment at CERN in Geneva.The first subject is the construction of the polarized target. In order to prepare the polarized target, several individual part must be completed. Our group has shared the construction of the superconductive magnet and the construction of microwave system. The magnet was ordered to Oxford Instr. Co. LTD. The first stage of the research was the design of the magnet. Second stage was the preparation of the cryogenic system, magnet support system, microwave system etc. We contributed the design of the microwave system and the cryogenic system. The control system of the magnet and cryogenic systems has been designed. The check of the system will be performed after the arrival of the magnet.For the construction of the scintillating fiber tracker, we made several test experiments on the pulse height and the time resolution in 1997-1999 at CERN and INS.In 1999, we have assembled a prototype o … More f a tracker with a diameter of 0.5 mm scintillating fiber, and measured the time resolution to the real muon beam in a beam intensity of 10ィイD18ィエD1 ppp. We found that the tracker gave a best time resolution of σ〜350 ps. This prototype is composed of 7 layers of fibers. It is found that the improvement of the voltage divider giving additional voltage from outside to the last 4 dinodes of the photo-tube (16ch. H1658 made by Hamamatsu Photonics) was quite effective the higher trigger rate experiment. We have contributed to COMPASS in one more field, that is, off-line analysis in the experiment. Before the data taking by the experiment, many programs have to be prepared, for example, monitors of the equipment, the graphic display of those data, display of data histograms, event pattern recognition, data base arrangement, simulation for reaction and detectors etc. Our group members contributed to the production of the program of the histogram formation, data base arrangements.The Grant-in-Aid (International Collaboration Research) supported the above mentioned research activities and some consumable materials which are needed for the development of the polarized target and the scintillating fiber tracker etc. Less

在这三年中，我们主要致力于日内瓦欧洲核子研究中心COMPASS实验的准备工作。为了制备极化靶，必须完成几个单独的部分。我们小组曾参与过永磁体的建造和微波系统的建造。磁铁被订购到牛津研究所。研究的第一阶段是磁铁的设计。第二阶段是低温系统、磁体支撑系统、微波系统等的准备工作，完成了微波系统和低温系统的设计。设计了磁体和低温系统的控制系统。在1997-1999年期间，我们在欧洲核子研究中心和惯性导航系统进行了脉冲高度和时间分辨率的测试实验，并于1999年组装了一台脉冲高度和时间分辨率的光纤跟踪器样机。 ...更多信息 在束流强度为10 μ π ι D ~ 18 μ π ι D ~ 1 ppp的情况下，测量了对真实的μ介子束流的时间分辨率。我们发现跟踪器的最佳时间分辨率为σ〜350 ps。该原型由7层纤维组成。结果表明，对分压电路的改进使光电管（16路）的后4个二极管获得了外部附加电压。H1658（Hamamatsu Photonics制造）在较高触发率实验中相当有效。我们在另一个领域为COMPASS做出了贡献，即实验中的离线分析。在实验数据采集之前，需要编写许多程序，如设备的监视器、数据的图形显示、数据直方图的显示、事件模式识别、数据库的整理、反应的模拟和检测器等，我们小组的成员参与了直方图形成程序的编写，援助赠款（国际合作研究）支持了上述研究活动和开发偏振目标和偏振光纤跟踪器等所需的一些消耗性材料。减

项目成果

N. Horikawa, B. Adeva and SMC: "Measurement of Proton and Nitrogen Polarization in Ammonia and a Test of Equal Spin Temperature"Nucl. Instr. and Methods in Phys. Research. A419. 60-82 (1998)

N. Horikawa、B. Adeva 和 SMC：“氨中质子和氮极化的测量以及等自旋温度的测试”Nucl。

N. Horikawa: "Where Do We Stand on the Understanding of the Nucleon Spin Carriers?"BUTSURI. Vol.54, No.8. (1999)

N. Horikawa：“我们对核子自旋载流子的理解处于什么位置？”BUTSURI。

堀川直顕、他SMCメンバー: "ポリエチレン偏極標的試料の開発" 原子核研究. 41. 185-202 (1997)

Naoaki Horikawa 等 SMC 成员：“聚乙烯极化靶样品的开发”核研究 41. 185-202 (1997)。

堀川直顕、高林直生、他: "偏極重陽子化ポリエチレン標的の開発"原子核研究. Vol.43. 1-43 (1998)

Naoaki Horikawa、Nao Takabayashi 等：“极化氘核聚乙烯靶材的开发”核研究第 1-43 卷（1998 年）。

N. Horikawa, B. Adeva, and SMC: "Spin Asymmetries AィイD21ィエD2 and Structure Functions gィイD21ィエD2 of the Proton and the Deuteron from Polarised High Muon Scattering"Phys. Rev.. D58. 112001-1-112001-17 (1998)

N. Horikawa、B. Adeva 和 SMC：“偏振高 μ 子散射中质子和氘核的自旋不对称性和结构函数”Phys。112001-1-112001-17 (1998)。