Two-body electrodisintegration of 3He at high momentum transfer
Two-body electrodisintegration of 3He at high momentum transfer
复制标题
高动量转移下 3He 的二体电分解
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Viviani
中科院分区：
文献类型：
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作者：
R. Schiavilla;O. Benhar;A. Kievsky;L. Marcucci;M. Viviani
利用精确的三核子束缚态波函数、包含一体和二体项的电磁电流算符模型和处理终态相互作用的Glauber近似，研究了{sup 3}He(e，e{sup‘p}p)d反应.与以前的研究不同，Glauber展开中的轮廓算符是由核子-核子散射振幅导出的，该振幅保持了它的全自旋和同位旋相关性，并与双核子散射数据的相移分析是一致的。振幅从质心标架(可对其进行参数化)增加到发生重新散射的标架。用精确蒙特卡罗方法计算了电磁电流算子的相关矩阵元素。在(0-700)MeV/c范围内，缺失动量p{subm}值的预测值与实验值在定量上是一致的，但在p{subm}{近似等于}1GeV/c处的数据被低估了约两倍。然而，测量到p600 MeV/c的纵向-横向不对称性在理论上得到了很好的再现。对本工作的结果与以前的研究结果进行了关键的比较。
The {sup 3}He(e,e{sup '}p)d reaction is studied using an accurate three-nucleon bound state wave function, a model for the electromagnetic current operator including one- and two-body terms, and the Glauber approximation for the treatment of final state interactions. In contrast to earlier studies, the profile operator in the Glauber expansion is derived from a nucleon-nucleon scattering amplitude which retains its full spin and isospin dependence, and is consistent with phase-shift analyses of two-nucleon scattering data. The amplitude is boosted from the center-of-mass frame, where parametrizations for it are available, to the frame where rescattering occurs. Exact Monte Carlo methods are used to evaluate the relevant matrix elements of the electromagnetic current operator. The predicted cross section is found to be in quantitative agreement with the experimental data for values of the missing momentum p{sub m} in the range (0-700) MeV/c, but underestimates the data at p{sub m}{approx_equal}1 GeV/c by about a factor of two. However, the longitudinal-transverse asymmetry, measured up to p{sub m}{approx_equal} 600 MeV/c, is well reproduced by theory. A critical comparison is carried out between the results obtained in the present work and those of earlier studies.