论文标题
手性有效野外理论相互作用的核多极反应
Nuclear multipole responses from chiral effective field theory interaction
论文作者
论文摘要
我们通过使用从手性有效场理论获得的相互作用来探测随机相近似框架中的核能共振。三核力的力包括在源自手性三核子力的中等内核中的形式。已经研究了封闭壳$^{56,68,78} $ ni的等轴偶极子，等轴偶极子，等二极管偶极子和等轴二极管的共振。这些计算合理地重现了$^{56,68} $ ni的实验多极共振，并很好地描述了以$^{68} $ ni测得的pygmy偶极共振和偶极极化性。预测了$^{78} $ ni的多极谐振，包括pygmy偶极共振和偶极性极化性。通过剖析手性相互作用来分析张量和三体力的详细作用。我们发现，尽管张力力提供了超过一半的结合能，但通常，张量力对电巨型共振的影响不如三体力的影响。三体力的影响在光核中很强。特别是，三体力对于在计算中形成侏儒共振至关重要。
We probe nuclear multipole resonances in the framework of the random-phase approximation by using the interaction obtained from the chiral effective field theory. The three-nucleon force is included in a form of the in-medium two-nucleon interaction which was derived from the chiral three-nucleon force. The isoscalar monopole, isoscalar dipole, isovector dipole and isoscalar quadrupole resonances of the closed-shell $^{56,68,78}$Ni have been investigated. The calculations reasonably reproduce the experimental multipole resonances of $^{56,68}$Ni, and well describe the pygmy dipole resonance and dipole polarizability measured in $^{68}$Ni. The multipole resonances of $^{78}$Ni, including pygmy dipole resonance and dipole polarizability, are predicted. The detailed effects of the tensor force and three-body force are analyzed by dissecting the chiral interaction. We find that in general the tensor force effect on electric giant resonances is not as significant as the effect from the three-body force, although the tensor force provides more than half of the binding energy. The effect from three-body force is strong in light nuclei. Particularly, three-body force is crucial for the formation of the pygmy resonance in calculations.
