Study on the Quark-Gluon Structure of Hadrons

强子夸克-胶子结构的研究

• 批准号: 10044340
• 负责人: HASEGAWA Takeo
• 金额: --
• 依托单位: Miyazaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for International Scientific Research.
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044340/
• 关键词: COMASS; Quark Spin; Gluon Polarization; Spin Structure of Nucleon; Scintillation Fiber; Beam Tracker; Polarized Target; SMC(Spin Muon Collaboration)

We are now preparing the experiment of the COMPASS(COmmon Muon Proton Apparatus for Structure and Spectroscopy) international collaboration program at CERN in order to investigate the spin structure of the nucleon as well as the quark-gluon structure of hadrons. One of the main experiments of the COMPASS program is to obtain the gluon polarization in the nucleon from the measurement of the cross-section asymmetry for the open charm production in the deep inelastic scattering of polarized muons on polarized nucleons.In this COMPASS collaboration, we are responsible for developing and constructing the new polarized hydrogen target system with a large opening solid angles of 180 nirad and the beam tracker detector system to determine the positions of incident muons precisely at the upstream and the downstream of the polarized target. To measure the gluon polarization, the tracks of muons must be determined in the spatial resolution of less than 0.5 mm in the detection area of 4 * 4 cm^22 … More under more than 10^8 incident muons per second. The scintillation fiber tracking detectors are considered to be applicable for these requirements from the good time and spatial resolution even in the extremely high counting rate condition.In the present research project we have investigated the plastic scintillation fiber tracking detector system combined with position-sensitive photo-multipliers to be used in the COMPASS experiment. A prototype tracking detector system was constructed by using plastic scintillation fibers connected to multi-anode type position-sensitive photo-multipliers(HAMAMATSU : H6568)and tested the characteristics with 450 MeV/c electrons at KIEK and 3.6 GeVk protons and pions at CERN.From the measurement, the time resolution of 680 psec was obtained for the beam intensity of 3.6*10^7 p/spill 110 mm^2, which is applicable for the use in the COMPASS experiment. Therefore, we have constructed the beam tracker system based on this type in this project for the start of the COMPASS experiment in 2000. Less

我们现在正在欧洲核子研究中心准备COMPASS（COmmon Muon Proton Apparatus for Structure and Spectroscopy）国际合作计划的实验，以研究核子的自旋结构以及强子的夸克-胶子结构。COMPASS计划的主要实验之一是从极化μ子对极化核子的深度非弹性散射中的开粲产生的截面不对称性的测量中获得核子中的胶子极化，在这次COMPASS合作中我们负责开发和建造具有180 nrad大开口立体角的新型极化氢靶系统和束流跟踪器探测器系统，以精确地确定入射μ介子在偏振目标的上游和下游的位置。为了测量胶子极化，必须在4 * 4 cm ^[22]的探测区域内以小于0.5 mm的空间分辨率确定μ子的径迹 ...更多信息 在超过10^8 μ子每秒的入射下。闪烁光纤跟踪探测器被认为是适用于这些要求从良好的时间和空间分辨率，即使在极高的计数率的条件下，在本研究项目中，我们已经研究了塑料闪烁光纤跟踪探测器系统结合位置敏感的光电倍增管用于COMPASS实验。利用塑料闪烁光纤与多阳极型位置敏感光电倍增管相连接，构建了一个跟踪探测器原型系统（滨松：H6568），并在KIEK和CERN分别用450 MeV/c电子和3.6 GeVk质子和π介子测试了这些特性。对于3.6*10^7 p/spill 110 mm^2的束流强度，获得了680 psec的时间分辨率，这适用于COMPASS实验。因此，我们在这个项目中已经构建了基于这种类型的光束跟踪系统，用于2000年开始的COMPASS实验。少

项目成果

S.Horikawa, T.Toeda, I.Daito, N.Doushita, T.Hasegawa, N.Horikawa et al.: "Time Resolution of a Scintillating Fiber Detector" To be published in Nuclear Instruments and Methods. (1999)

S.Horikawa、T.Toeda、I.Daito、N.Doushita、T.Hasekawa、N.Horikawa 等人：“闪烁光纤探测器的时间分辨率”将发表在《核仪器和方法》上。

B.Adeva, E.Arik, T.Hasegawa, N.Horikawa et al.(The Spin Muon Collaboration): "Measurement of Proton and Nitrogen Polarization in Ammonia and a Test of Equal Spin Temperature" Nuclear Instruments and Methods. A419. 60-82 (1998)

B.Adeva、E.Arik、T.Hasekawa、N.Horikawa 等人（The Spin Muon Collaboration）：“氨中质子和氮极化的测量以及等自旋温度的测试”核仪器和方法。

長谷川武夫: "Hadronic final states from polarized deep-inelastic scattering and spin distribution of valence and non-strange sea quarks" Nuclear Physics. A629. 273c-276c (1998)

Takeo Hasekawa：“来自极化深非弹性散射和价态和非奇异海夸克的自旋分布的强子最终状态”核物理 A629。

B.Adeva, T.Akdogan, T.Hasegawa, N.Horikawa et al.(The Spin Muon Collaboration): "Spin Asymmetries A_1 and Structure Functions g_1 of the Proton and the Deuteron from Polarized High Energy Muon Scattering" Physical Reviews. D58. 112001-112001 (1998)

B.Adeva、T.Akdogan、T.Hasekawa、N.Horikawa 等人（The Spin Muon Collaboration）：“来自极化高能 μ 子散射的质子和氘核的自旋不对称 A_1 和结构函数 g_1”物理评论。

長谷川武夫、堀川直顕、岩田高広、松田達郎、他SMCメンバー: "Spin Asymmetries A_1 and Structure Functions g_1 of the Proton and the Deuteron from Polarized High Energy Muon Scattering" Physical Reviews. D58. 112001-112001 (1998)

Takeo Hasekawa、Naoaki Horikawa、Takahiro Iwata、Tatsuro Matsuda 和其他 SMC 成员：“偏振高能 μ 介子散射中质子和氘核的自旋不对称性 A_1 和结构函数 g_1”物理评论 112001-112001。