D(e,e'p) Coincidence Experiments in the Out-of-plane

D(e,ep) 面外符合实验

• 批准号: 08044050
• 负责人: TAMAE Tadaaki
• 金额: $ 2.82万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044050/
• 关键词: out-of-plane; interference term; polarized electron beam; quasi-elastic scattering; final-state; meson exchange current; relativistic effect

We made experiments, D(e,e'p) Coincidence Measurements out of the scattering plane, as a member of the OOPS collaboration at the MIT-Bates laboratory in 1996. In the experiments, a liquid deuterium target was irradiated with an electron beam, and scattered electrons and emitted protons were detected simultaneously. This experiments had advantages that the electron beam was longitudinally polarized and protons were detected out of the scattering plane. The electron beam, accelerated by an electron linac with a recirculation system has a duty factor of 1% and a polarization of 40%. Scattered electrons and emitted protons were analysed with 4 spectrometers. The experiments covered two regions, quasi-elastic and dip regions.(1)D(e,e'p) Experiments in the quasi-elastic region.The experiments were made at an electron energy of 800 MeV and a transferred energy of 110.6MeV. The scattered electrons were measured at 30.27゜,where a four-momentum transfer is 0.22(GeV/c)ィイD12ィエD1. We measured asymmetries, AィイD2LTィエD2, AィイD2TTィエD2, and A'ィイD2LTィエD2 at two kinematical conditions, and compared the obtained results with calculations by Arenhovel. The result shows that in the quasi-elastic region, contributions from MEC's and isobar currents are small, and relativistic effects are important.(2)D(e,e'p) Experiments in the dip region.The experiments were made at an electron energy of 800 MeV and a transferred energy of 155 MeV. Scattered electrons were measured at 31゜. We set three OOPS spectrometers for proton measurement at same polar angle (20.5゜)and different azimuthal angles to obtain asymmetries, AィイD2LTィエD2, AィイD2TィエD2, and A'ィイD2LTィエD2. Similar to the case in the quasi-elastic region, the longitudinal-transverse interference term shored importance of the relativistic effects.

我们做了实验，D（e，e 'p）符合测量的散射平面，作为OOPS合作的成员在麻省理工学院贝茨实验室于1996年。在实验中，用电子束照射液体氘靶，同时检测散射电子和发射质子。该实验的优点是电子束被纵向极化，质子被探测到的散射平面外。电子束，加速的电子直线加速器与再循环系统具有1%的占空比和40%的极化。用4个光谱仪分析散射电子和发射质子。实验包括两个区域，准弹性和倾斜区域。（1）D（e，e ′ p）准弹性区实验，电子能量为800 MeV，转移能量为110.6MeV。散射电子的测量值为30.27 μ m，其中四动量转移为0.22（GeV/c）μ m D12 μ m D1。在两种运动学条件下，我们测量了不对称性，A D2 LT D2，A D2 TT D2和A 'D2 LT D2，并将所得结果与Arenhovel的计算结果进行了比较。结果表明，在准弹性区，MEC和等压流的贡献很小，相对论效应很重要。（2）D（e，e ′ p）实验，电子能量为800 MeV，转移能量为155 MeV。在31 ° C下测量散射电子。我们设置三台OOPS谱仪在相同的极角（20.5 °）和不同的方位角进行质子测量，以获得不对称性，A π D2 LT π D2，A π D2 T π D2和A ′ π D2 LT π D2。与准弹性区的情况类似，横向干涉项也反映了相对论效应的重要性。

项目成果

S.Soong他: "Measurements of R_<LT>,R_<TT>,and R′_<LT> structure functions in a quasi-elastic ^2H (e^^→,e′p) reaction at 210 (MeV/c) missing momentum." アメリカ物理学会.

S. Soong 等人：“210 时准弹性 ^2H (e^^→,e′p) 反应中 R_<LT>、R_<TT> 和 R′_<LT> 结构函数的测量 ( MeV/ c) 缺少动量。”美国物理学会。

J.Chen他: "Measurements of R_<LT>,R_<TT>,and R′_<LT> structure functions in a non-quasi-elastic ^2H (e^^→,e′p) reaction at 210 (MeV/c) missing momentum." アメリカ物理学会.

J. Chen 等人：“在非准弹性 ^2H (e^^→,e′p) 反应中测量 R_<LT>、R_<TT> 和 R′_<LT> 结构函数210 (MeV/c) 缺少动量。”美国物理学会。

A.Young他: "Measurements of R_<LT> and R′_<LT> structure functions in a quasi-elastic ^2H (e^^→,e′p) reaction as a function of missing momentum." アメリカ物理学会.

A. Young 等人：“准弹性 ^2H (e^^→,ep) 反应中 R_<LT> 和 R′_<LT> 结构函数的测量作为缺失动量的函数。”物理学会。

X.Jiang他: "Measurements of R_<LT> and R′_<LT> structure functions in a quasi-elastic ^<12>C (e^^→,e′p) reaction."

X. Jiang 等人：“准弹性 ^<12>C (e^^→,e′p) 反应中 R_<LT> 和 R′_<LT> 结构函数的测量。”