科研人员利用稀有同位素束设施(FRIB)进行的实验发现，某些原子核释放异常多的低能伽马射线源于核内磁性的变化——质子和中子翻转其内部磁矩1。这项研究成果已发表在《自然》杂志2026年第655卷第8124期第875页1。
在铜同位素70Cu衰变为锌70Zn的实验中，研究人员通过分离电性和磁性衰变态，确认了仅磁性跃迁产生了低能伽马射线的增强效应1。该项研究由劳伦斯利弗莫尔国家实验室进行，FRIB前研究生Eleanor Ronning担任第一作者1。共同主导该研究的Andrea Richard现为俄亥俄大学助理教授1。
这一发现具有广泛应用前景，可被应用于核储备性能评估、核取证以及恒星核反应建模等领域1。
Researchers have identified the source of anomalously high levels of low-energy gamma rays emitted by certain atomic nuclei, tracing the phenomenon to magnetic changes occurring within the nucleus itself 1. The study, published in Nature in 2026 (Volume 655, Issue 8124, page 875), reveals that protons and neutrons flip their internal magnetic moments, generating the enhanced gamma ray emissions 1.
The discovery emerged from experiments conducted at the Facility for Rare Isotope Beams (FRIB), where researchers observed the effect during the decay of copper-70 into zinc-70 1. By isolating electric and magnetic decay states, the team confirmed that magnetic transitions alone were responsible for producing the low-energy enhancement effect 1. Eleanor Ronning, a former FRIB graduate researcher, led the investigation, with Andrea Richard, now an assistant professor at Ohio University, serving as co-lead 1.
The findings carry significant practical implications across multiple fields, including assessments of nuclear stockpile performance, nuclear forensics, and modeling of stellar nuclear reactions 1.
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