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arXiv 2602.05422nucl-th
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三体共振在离散基中的衰减

Decay of three-body resonances in a discrete basis

Universidad de Sevilla(塞维利亚大学);Centro Nacional de Aceleradores, U. Sevilla, J. Andalucía, CSIC(塞维利亚大学安达卢西亚自治区CSIC国家加速器中心)

J. Casal, J. Gómez-Camacho

AI总结:

本文提出了一种理论方法,用于研究三体共振在离散基中的衰减特性,通过计算渐近系数和衰变动力学,揭示了三体共振的内部结构与衰变行为之间的联系。

摘要:

我们提出了一种理论框架,用于计算在离散基描述下三体共振的渐近性质和衰变动力学。该方法涉及求解非齐次薛定谔方程,以确定非正交化共振态,通过识别可正交化的源态来捕捉短程内部结构。长程行为则通过自由三体传播子计算,提供准确的渐近系数,这对于描述衰变相关性至关重要。我们将该形式化应用于$^{16}\text{Be}$($^{14}\text{Be}+n+n$)的0$^{+}$基态和2$^{+}$激发态共振的双中子衰变,采用超球面展开法,并使用解析变换的谐振子基。我们的结果表明,在大分离距离下,衰变主要由最低超角动量分量主导,反映了有效三体屏障穿透动力学,塑造了最终态。计算出的相对能分布显示,对于两种状态都有明显的中子-中子相关性,起源于不同渐近通道的混合,并与直接双中子发射机制一致,符合最近的实验观测。这项工作提供了一种可靠工具,将三体共振的内部结构与其衰变特性联系起来。

英文摘要:

We present a theoretical framework for calculating the asymptotic properties and decay dynamics of three-body resonances described in a discrete basis. The method involves solving an inhomogeneous Schrödinger equation to determine the non-normalizable resonant state by identifying a normalizable source state, which captures the short-range internal structure. The long-range behavior is then calculated using the free three-body propagator, providing accurate asymptotic coefficients necessary for describing decay correlations. We apply this formalism to the two-neutron decay of the 0$^{+}$ ground-state and the 2$^{+}$ excited-state resonances of $^{16}\text{Be}$ ($^{14}\text{Be}+n+n$), working within the hyperspherical expansion method with an analytical transformed harmonic oscillator basis. Our results show that the decay is strongly dominated by the lowest hypermomentum components at large separations, reflecting effective three-body barrier penetration dynamics that shape the final state. The calculated relative-energy distributions exhibit clear neutron-neutron correlations for both states, arising from mixing between different asymptotic channels, and are consistent with a direct two-neutron emission mechanism, in agreement with recent experimental observations. This work provides a reliable tool for linking the internal structure of three-body resonances to their decay properties.

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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