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Research in medium enrgy nuclear structure with electron scattering.

电子散射中能核结构研究。

基本信息

批准号：
63044058
负责人：
HOTTA Akio
金额：
$ 3.84万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Overseas Scientific Survey.
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63044058/
关键词：
Core-polarization effect Meson-exchange currents Relativistic effects in nuclei Electron scattering Transverse form factors Freedom of quark and nucleon in nuclei High momentum transfer Medium energy nuclear physics

项目摘要

1. At MIT-Bates Lab.; Transverse elastic and inelastic form factors for low-lying levels in ^<117>Sn in the momentum transfer range q= 1.2-2.4 fm^<-1>, and the ^<41>Ca elastic magnetic form factors in the q range from 0.9 to 2.0 fm^<-1>, have been measured by 180ﾟ electron scattering. The quenching from the predictions of the extreme single -particle model has been observed for both ^<117>Sn and ^<41>Ca. The first order core-polarization effects and meson exchange current(MEC) corrections have been investigated comparing the new data.2. At SLAC Stanford University; The cross sections for 180ﾟ deuteron electrodisintegration have been measured near threshold for Q^2-range 1.21 to 2.77 (GeV/C)^2. Nonrelativistic calculations based on both meson-nucleon and hybrid quark-hadron models are not in quantitative agreement with the new data. The necessity of relativistic model is pointed out.

1.在麻省理工-贝茨实验室。用<117>180 μ m电子散射测量了在动量转移范围q= 1.2-2.4 fm^内^ Sn中低能级的横向弹性和非弹性形状因子<-1>，以及在<41>q = 0.9 - 2.0 fm^内^ Ca中低能级的弹性磁性形状因子<-1>。对于^ Sn和^ Ca都观察到了极端单粒子模型预测的淬灭<117><41>。通过与新数据的比较，研究了一阶核极化效应和介子交换流（MEC）修正.在SLAC斯坦福大学;在Q^2范围为1.21 ~ 2.77（GeV/C）^[2]的情况下，在阈值附近测量了180氘的电致衰变截面。基于介子-核子模型和混合夸克-强子模型的非相对论计算与新数据在定量上不一致。指出了相对论模型的必要性。