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arXiv 0704.1336nucl-th
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用手征有效场论计算二加三核子相互作用下$^4$ He的光吸收总截面

The $^4$He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory

S. Quaglioni, P. Navratil

摘要:

基于手征有效场论($χ$ EFT),利用双核子和三核子相互作用,在微观上计算了$^4$ He的总光吸收截面.计算是使用洛伦兹积分变换法以及{ \em ab initio}无核壳模型方法进行的。本研究的一个重要特征是NN和NNN相互作用的一致性,也通过Siegert定理,两体和三体电流算子。这是由于应用了$χ$ EFT框架。包含NNN相互作用产生的低能量峰的抑制和增强的高能量尾部的截面。我们比较使用其他相互作用和代表性的实验获得的计算。在巨共振区相当混乱的实验情况,防止不同的相互作用模型之间的歧视。

英文摘要:

The total photo-absorption cross section of $^4$He is evaluated microscopically using two- (NN) and three-nucleon (NNN) interactions based upon chiral effective field theory ($χ$EFT). The calculation is performed using the Lorentz integral transform method along with the {\em ab initio} no-core shell model approach. An important feature of the present study is the consistency of the NN and NNN interactions and also, through the Siegert theorem, of the two- and three-body current operators. This is due to the application of the $χ$EFT framework. The inclusion of the NNN interaction produces a suppression of the low-energy peak and enhancement of the high-energy tail of the cross section. We compare to calculations obtained using other interactions and to representative experiments. The rather confused experimental situation in the giant resonance region prevents discrimination among different interaction models.

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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