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arXiv 2602.09480nucl-thastro-ph.SRnucl-ex
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重核中双α衰变的三体屏障动力学

Three-Body Barrier Dynamics of Double-Alpha Decay in Heavy Nuclei

School of Physics, Nanjing University of Science and Technology(南京理工大学物理学院);Department of Physics, Royal Institute of Technology (KTH)(瑞典皇家理工学院物理系);College of Science, Hohai University(河海大学理学院);Institute of Modern Physics, Fudan University(复旦大学现代物理研究所);School of Physics Science and Engineering, Tongji University(同济大学物理科学与工程学院)

Shulin Tang, Tao Wan, Yibin Qian, Chong Qi, Ramon A. Wyss, Roberto J. Liotta, Dong Bai, Bo Zhou, Zhongzhou Ren

AI总结:

本文通过三体问题框架研究重核中双α衰变的动力学,揭示了同时与顺序α发射的穿透比与ZQ_{αα}^{-1/2}的线性关系,并提出潜在的观测候选核素。

摘要:

双α衰变,即同时发射两个α粒子,是一种长期预测但尚未观测到的核放射性衰变模式。本文将该过程作为超球坐标框架下的真实三体问题,通过数值求解相应的超径薛定谔方程,并结合大规模随机采样势参数,评估衰变概率;后者处理确保了当前结果更具说服力。受此启发,我们证明同时和顺序α发射的穿透比表现出对ZQ_{αα}^{-1/2}的显著线性依赖性,将屏障穿透动力学扩展到相关少数体领域。建议^{108}Xe、^{218}Ra、^{224}Pu、^{222}U、^{216}Rn和^{220}Th为观测双α衰变最具有前景的核素,预测的半衰期可能在当前探测极限内可实现。我们的结果为多α衰变提供了统一框架,并开辟了探测重核中核簇极和少数体相关性的途径。

英文摘要:

The simultaneous emission of two $α$ particles--double-$α$ decay--represents a long-predicted but unobserved mode of nuclear radioactivity. Here we formulate this process as a genuine three-body problem within the hyperspherical coordinate framework and evaluate decay probabilities by numerically solving the corresponding hyperradial Schrödinger equation, combined with large-scale random sampling of the potential parameters; the latter treatment ensures that the present results are more convincing. Inspired by this, we demonstrate that the penetrability ratio between simultaneous and sequential $α$ emission exhibits a strikingly linear dependence on $ZQ_{αα}^{-1/2}$, extending the barrier penetration dynamics into the correlated few-body regime. The nuclei $^{108}$Xe, $^{218}$Ra, $^{224}$Pu, $^{222}$U, $^{216}$Rn, and $^{220}$Th are suggested as the most promising candidates for the observation of double-$α$ decay, with predicted half-lives potentially accessible within present detection limits. Our results provide a unified framework for multi-$α$ decay and open a pathway to probing nuclear clustering and few-body correlations in heavy nuclei.

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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