Nonresonant Density of States Enhancement at Low Energies for Three or Four Neutrons
Nonresonant Density of States Enhancement at Low Energies for Three or Four Neutrons
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DOI：
10.1103/physrevlett.125.052501
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发表时间：
2020-07-28
影响因子：
8.6
通讯作者：
Viviani, M.
中科院分区：
文献类型：
--
作者：
Higgins, Michael D.;Greene, Chris H.;Viviani, M.
三个或四个中子的低能系统在绝热的超球面框架内处理，产生了根据绝热势能曲线对低能量子态的理解。每个系统的主要低能势曲线，在这里使用广泛接受的核子-核子相互作用计算，包括或不包括三核子力，没有显示出低能共振的迹象。然而，这两种系统都表现出态密度的低能量增强，或Wigner-Smith时间延迟，这源自于类似于Efimov效应的远程宇宙物理。这种增强可能与Kisamori等人在核反应实验中观察到的相关四中子抛射事件的低能量过剩有关。
The low energy systems of three or four neutrons are treated within the adiabatic hyperspherical framework, yielding an understanding of the low energy quantum states in terms of an adiabatic potential energy curve. The dominant low energy potential curve for each system, computed here using widely accepted nucleon-nucleon interactions with and without the inclusion of a three-nucleon force, shows no sign of a low energy resonance. However, both systems exhibit a low energy enhancement of the density of states, or of the Wigner-Smith time delay, which derives from long-range universal physics analogous to the Efimov effect. That enhancement could be relevant to understanding the low energy excess of correlated four-neutron ejection events observed experimentally in a nuclear reaction by Kisamori et al.