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arXiv 1809.02247nucl-th
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自洽声子耦合模型中奇异核的激发谱

Excitation spectra of exotic nuclei in a self-consistent phonon-coupling model

N. Lyutorovich, V. Tselyaev, J. Speth, P. -G. Reinhard

摘要:

我们探索巨共振谱和低躺在镍和锡链的偶极强度从质子丰富的中子丰富的同位素,相关的天体物理反应链。对于理论描述,我们采用随机相位近似(RPA)加上多体效应,通过声子耦合模型与优化选择的声子。核力是基于Skyrme-Hartree-Fock能量泛函,在建模的所有步骤中始终进行。声子耦合的主要效应是光谱分布的加宽(碰撞宽度)。这种加宽对于非常富中子的核中的低偶极强度特别显著,从而使光谱发生质的变化。

英文摘要:

We explore giant resonance spectra and low-lying dipole strength in the Ni and Sn chains from proton rich to very neutron rich isotopes, relevant in astrophysical reaction chains. For the theoretical description we employ the random-phase approximation (RPA) plus many-body effects through a phonon coupling model with optimized selection of phonons. The nuclear force is based on the Skyrme-Hartree-Fock energy functional carried consistently through all steps of modelling. The main effect of phonon coupling is a broadening of the spectral distributions (collisional width). This broadening is particularly dramatic for low-lying dipole strength in very neutron rich nuclei delivering there a qualitative change of the spectra.

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