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arXiv 1603.03120nucl-thnucl-ex
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$^{25}$ O和$^{26}$ O核的衰变动力学

Decay dynamics of the unbound $^{25}$O and $^{26}$O nuclei

K. Hagino, H. Sagawa

摘要:

我们用考虑到连续介质耦合的$^{24}$ O+n+n三体模型研究了$^{26}$ O的基态和激发共振态。为此,我们使用新的实验数据的非束缚$^{25}$ O和$^{26}$ O核的不变质谱,并提出了一个更新的三体模型计算的两个中子衰变的$^{26}$ O核。利用由$^{26}$ O基态衰变确定的新模型输入,我们讨论了该核的双电子关联和晕的性质,以及激发态的结构.对于2 $^+$态的能量,我们取得了很好的协议与实验数据与此计算。我们发现,2 $^+$状态主要由$(d_{3/2})^2$配置,其中的价中子之间的配对相互作用略有降低其能量从未扰动的。我们还讨论了$^{26}$ O核的0 $^+$激发态的结构。特别是,我们表明存在一个激发0 $^+$状态在3.38 MeV,这是主要由$(f_{7/2})^2$配置。

英文摘要:

We study the ground and excited resonance states of $^{26}$O with a three-body model of $^{24}$O+n+n taking into account the coupling to the continuum. To this end, we use the new experimental data for the invariant mass spectroscopy of the unbound $^{25}$O and $^{26}$O nuclei, and present an update of three-body model calculations for the two-neutron decay of the $^{26}$O nucleus. With the new model inputs determined with the ground state decay of $^{26}$O, we discuss the di-neurtron correlations and a halo nature of this nucleus, as well as the structure of the excited states. For the energy of the 2$^+$ state, we achieve an excellent agreement with the experimental data with this calculation. We show that the 2$^+$ state consists predominantly of the $(d_{3/2})^2$ configuration, for which the pairing interaction between the valence neutrons slightly decreases its energy from the unperturbed one. We also discuss the structure of excited 0$^+$ states of the $^{26}$O nucleus. In particular, we show the existence of an excited 0$^+$ state at 3.38 MeV, which is mainly composed of the $(f_{7/2})^2$ configuration.

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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