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Nuclear multipole responses from chiral effective field theory interactions

机译：手性有效场理论相互作用的核多体反应

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摘要

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 Ni-56,Ni-68,Ni-78 have been investigated. The calculations reasonably reproduce the experimental multipole resonances of Ni-56,Ni-68, and well describe the pygmy dipole resonance and dipole polarizability measured in Ni-68. The multipole resonances of Ni-78, 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.
机译：通过使用从手性有效场理论获得的相互作用，我们探测随机相近似的框架中的核多极共振。三核力包括以中载二核相互作用的形式，其衍生自手性三核力。研究了闭合壳Ni-56，Ni-68，Ni-78的isoscalar偶极物，isoscalar偶极子，等脂偶极子和isoscalar四极掺换。该计算合理地再现Ni-56，Ni-68的实验多极共振，并良好地描述了Ni-68中测量的侏儒偶极谐振和偶极极化性。预测了Ni-78的多极共振，包括侏儒偶极谐振和偶极极化性。通过解剖手性相互作用来分析张力力和三体力的详细效果。我们发现，一般而言，张力效应对电动巨大共振的张力作用并不像三体力的效果一样重要，尽管张力力提供超过一半的结合能量。三体力的效果在轻质核中强烈。特别地，三体力对于在计算中形成侏儒共振是至关重要的。

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