STUDY OF NUCLEON-NUCLEON CORRELATION IN NUCLEI

原子核中核子-核子相关性的研究

• 批准号: 03402003
• 负责人: SUGAWARA Masumi
• 金额: $ 21.5万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03402003/
• 关键词: Electro-magnetic interaction; Nucleon-nucleon correlation; Continuous electron beam; Photo-nuclear reaction; Electron scattering; 電〓相互作用; 同時計数実験; 核内核子相関

The main results obtained in the present project are as follow.1.Photo-nuclear reactions using tagged photons.1) At the excitation energies above the giant resonances, ^<40>Ca(gamma, n) cross sections could be explained by the quasi-deuteron model.2) Angular correlatious of two protons from the (gamma, pp) reaction showed back to back correlations like in the (gamma, pn) reaction.3) The position and the width of the IVGQR were obtained from the ^<13>C(gamma, n) experiment.2. (e, e'p), (e, e't) reactions1) The importance of the processes via E1 and E2 resonances was shown in ^<12>C(e, e'po) reaction.2) A large L-T interference was observed in the ^6Li(e, e'p) reaction, however not in the ^6Li(e, e't) reaction.3. (e, e'n) reactions1) The angular distribution of neutrons from the ^<12>C(e, e'n) reaction was found to be an out of phase of protons in the ^<12>C(e, e'p) reaction.2) The iso-spins of the giant dipole resonances in ^<13>C were determined by observing the ^<13>C(gamma, n) cross sections to final states with definite iso-spin.3) The effect of the iso-spin of the excited states were also observed in the angular distribution of the ^<40>Ca(gamma, n) reaction.4. A new beam transport system which connects two experimental areas were constructed. The possibility of doing the parasitic experiment was shown.5. Workshop and Seminar1) "Workshop on electron scattering experiment using internal target" was held at the Laboratory of Nuclear Science in Dec.18-19, 1992.2) A series of seminars on modern theories of photo-nuclear reactions was given by Dr. J.Ryckebusch invited from the University of Gent at Belgium.

本项目获得的主要结果如下。1.利用标记光子的光核反应。1）在巨共振以上的激发能处，^<40>Ca（γ，n）截面可以用准氘核模型来解释。2）两个质子的角关联（gamma，pp）反应表现出与（gamma，pn）反应类似的背靠背相关性。3）IVGQR的位置和宽度由^<13>C（gamma，n）实验获得。（e，e 'p），（e，e 't）反应1）在^ C（e，e' po）反应中通过E1和E2共振的过程的重要性得到了证明<12>。2）在^6Li（e，e 'p）反应中观察到了很大的L-T干涉，而在^6Li（e，e 't）反应中没有观察到。（e，e 'n）反应1）从^<12>C（e，e' n）反应中产生的中子角分布与^<12>C（e，e 'p）反应中的质子角分布是异相的; 2）<13>通过观察^<13>C（γ，n）到具有确定的同位旋的终态的截面，确定了^ C中巨偶极共振的同位旋; 3）在^ Ca（γ，n）反应的角分布中也观察到激发态的同位旋效应<40>.建立了一个连接两个实验区的束流传输系统。说明了进行寄生实验的可能性. 1992年12月18日至19日，在核科学实验室举办了“内靶电子散射实验研讨会”。2）邀请比利时根特大学的J.Ryckebusch博士作了一系列关于现代光核反应理论的研讨会。

项目成果

T.Tadokoro et al.: "The (e, e'po) coincidence cross section for ^<12>C at transfer energy of 40Mev" Nucl.Phys.(in press). (1994)

T.Tadokoro 等人：“^12C 在 40Mev 传输能量下的 (e, epo) 重合截面”Nucl.Phys.（正在出版）。

鈴木伸介: "Neutron Detection System for the (e,e'n) Reaction" Nucl.Inst.and Meth.A314. 547-552 (1992)

Shinsuke Suzuki：“(e,en) 反应的中子检测系统”Nucl.Inst.and Meth.A314 (1992)。

斎藤悌二郎: "A Study of the Giant Resonance in ^<12>C,^<13>C and ^<40>Ca" Proc.4th Int.Spring Seminar on Nuclear Physics ed.by A.Covello,World Scientific,1993. 401-409 (1993)

Teijiro Saito：“A Study of the Giant Resonance in ^<12>C,^<13>C and ^<40>Ca”Proc.4th Int.Spring Seminar on Nuclearphysical ed.by A.Covello，World Scientific，1993 401-409（1993）

田所孝広: "The (e,e'p_0) coincidence cross section for ^<12>C at transfer energy of 40 MeV" Nucl.Phys.(印刷中). (1994)

Takahiro Tadokoro：“传输能量为 40 MeV 时 ^<12>C 的 (e,ep_0) 重合截面”Nucl.Phys.（出版中）。

S.Itoh et al.: "Parasitic Experiment Using Electron Beam" Proc.the 18th Linear Accelerator Meeting in Japan. 383-385 (1993)

S.Itoh 等人：“使用电子束的寄生实验”，第 18 届日本直线加速器会议论文集。