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arXiv 1503.03186nucl-th
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三体模型中$^{26}$ O的连续激发:$0^+$和$2^+$态

Continuum excitations of $^{26}$O in a three-body model: $0^+$ and $2^+$ states

L. V. Grigorenko, M. V. Zhukov

摘要:

在三体$^{24}$ O+ $n$ + $n$模型中研究了$^{26}$ O的$0^+$和$2^+$连续激发态的结构和衰变动力学.证明了一个简单的近似的长寿命$2n$发射的截面轮廓的有效性。一个序列的三个$0^+$双(“呼吸模式”型)激发态的预测。这些状态可能被解释为由于不充分的结合而在连续体中被推动的Efimov状态的类似物。计算的$2^+$态能量与$^{25}$ O的激发光谱有关。我们讨论了预测的$^{26}$ O光谱和实验观测之间的相关性。

英文摘要:

The structure and decay dynamics for $0^+$ and $2^+$ continuum excitations of $^{26}$O are investigated in a three-body $^{24}$O+$n$+$n$ model. The validity of a simple approximation for the cross section profile for long-lived $2n$ emission is demonstrated. A sequence of three $0^+$ monopole ("breathing mode" type) excited states is predicted. These states could probably be interpreted as analogues of Efimov states pushed in the continuum due to insufficient binding. The calculated energies of the $2^+$ states are related to the excitation spectrum of $^{25}$O. We discuss the correlation between the predicted $^{26}$O spectrum and experimental observations.

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