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arXiv 1101.2376nucl-th
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低激发态~(18)Ne的三体结构

Three-body structure of low-lying 18Ne states

J. A. Lay, D. V. Fedorov, A. S. Jensen, E. Garrido, C. Romero-Redondo

摘要:

我们研究了~(18)Ne在多大程度上可以描述为一个由惰性~(16)O核和两个质子组成的三体系统。我们比较实验数据,偶尔壳模型的结果。用超球绝热膨胀方法得到了三体波函数。我们研究了~(18)Ne的光谱、各态的结构和主要跃迁强度。两个0+,两个2+,和一个4+的束缚态被发现,他们都是已知的实验。还发现了一个接近阈值的3+态和几个负宇称态,1-,3-,0-,2-,它们大多数与16 O激发的3-态束缚。提取的结构作为分波分量,作为物质和电荷的空间尺寸,并作为概率分布。计算了这些状态的电磁衰减率。束缚态的主要衰变模式是E2,偶尔也是M1。

英文摘要:

We investigate to what extent 18Ne can be descibed as a three-body system made of an inert 16O-core and two protons. We compare to experimental data and occasionally to shell model results. We obtain three-body wave functions with the hyperspherical adiabatic expansion method. We study the spectrum of 18Ne, the structure of the different states and the predominant transition strengths. Two 0+, two 2+, and one 4+ bound states are found where they are all known experimentally. Also one 3+ close to threshold is found and several negative parity states, 1-, 3-, 0-, 2-, most of them bound with respect to the 16O excited 3- state. The structures are extracted as partial wave components, as spatial sizes of matter and charge, and as probability distributions. Electromagnetic decay rates are calculated for these states. The dominating decay mode for the bound states is E2 and occasionally also M1.

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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