~（26）O基态衰变的三体关联
Three-body correlations in the ground-state decay of 26O
摘要：
背景资料：理论计算表明，两中子O ~（26）三体衰变的能量和角关联可以提供关于基态波函数的信息，它被预言具有双中子组态和2n晕结构.目的：利用实验测量的三体关联来深入了解O_（26）的性质，包括衰变机制和基态共振能。方法：在F27的单质子敲除反应中产生O26，并使用MoNA-Sweeper装置测量O24+n+n衰变产物。提取了O26基态共振衰变的三体关联。实验结果进行了比较，蒙特卡罗模拟，其中的共振能量和衰减机制是不同的。结果如下：通过蒙特卡罗模拟很好地再现了测量的三体关联，但由于实验分辨率的原因，对衰变机制不敏感。然而，三体关联被发现是敏感的共振能量的O26。O26的基态共振能量的1σ上限为53 keV。结论：由于需要精确测量目标中反应点处的O24动量，因此未来从O26的基态衰变测量三体相关性的尝试将非常具有挑战性。
英文摘要：
Background: Theoretical calculations have shown that the energy and angular correlations in the three-body decay of the two-neutron unbound O26 can provide information on the ground-state wave function, which has been predicted to have a dineutron configuration and 2n halo structure. Purpose: To use the experimentally measured three-body correlations to gain insight into the properties of O26, including the decay mechanism and ground-state resonance energy. Method: O26 was produced in a one-proton knockout reaction from F27 and the O24+n+n decay products were measured using the MoNA-Sweeper setup. The three-body correlations from the O26 ground-state resonance decay were extracted. The experimental results were compared to Monte Carlo simulations in which the resonance energy and decay mechanism were varied. Results: The measured three-body correlations were well reproduced by the Monte Carlo simulations but were not sensitive to the decay mechanism due to the experimental resolutions. However, the three-body correlations were found to be sensitive to the resonance energy of O26. A 1σ upper limit of 53 keV was extracted for the ground-state resonance energy of O26. Conclusions: Future attempts to measure the three-body correlations from the ground-state decay of O26 will be very challenging due to the need for a precise measurement of the O24 momentum at the reaction point in the target.
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