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arXiv 0906.5598nucl-th
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高动量转移准弹性电子散射中的介子交换流和末态相互作用

Meson-exchange currents and final-state interactions in quasielastic electron scattering at high momentum transfers

J. E. Amaro, M. B. Barbaro, J. A. Caballero, T. W. Donnelly, C. Maieron, J. M. Udias

摘要:

本文计算了在准弹性峰区高动量转移$q$条件下有限核单粒子单空穴横向响应函数的介子交换流效应。本文采用半相对论壳层模型研究了单粒子发射$(e,e')$反应。相对论效应包括使用相对论运动学,执行当前运营商的半相对论扩展,并使用基于狄拉克方程(DEB)的形式的相对论平均场势的最终状态。结果表明,对于$q\geq 1$ GeV/c,末态相互作用(FSI)在响应函数的高能尾部产生了MEC的重要增强.当采用其他不基于DEB势的FSI模型时,MEC和FSI的组合效应消失。

英文摘要:

The effects of meson-exchange currents (MEC) are computed for the one-particle one-hole transverse response function for finite nuclei at high momentum transfers $q$ in the region of the quasielastic peak. A semi-relativistic shell model is used for the one-particle-emission $(e,e')$ reaction. Relativistic effects are included using relativistic kinematics, performing a semi-relativistic expansion of the current operators and using the Dirac-equation-based (DEB) form of the relativistic mean field potential for the final states. It is found that final-state interactions (FSI) produce an important enhancement of the MEC in the high-energy tail of the response function for $q\geq 1$ GeV/c. The combined effect of MEC and FSI goes away when other models of the FSI, not based on the DEB potential, are employed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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