近日，美国密歇根州立大学E. K. Ronning团队报道了70Zn中低能增强的磁性特征。该项研究成果发表在2026年7月15日出版的《自然》杂志上。

原子核从激发态跃迁到较低能态通常伴随光子的发射。光子发射的几率是光子能量以及初末核态性质的函数，被称为光子（或γ射线）强度函数（γSF）。在γSF呈现的诸多特征中，一些原子核的低能区曾观测到增强现象，但这种增强的电磁性质仍悬而未决。γSF中的这种低能增强对人们理解恒星中元素的合成以及原子核结构具有重要影响。

研究组报告了关于70Zn的γSF实验结果，结果表明该原子核γSF中的增强具有磁性质。这一观测结果有助于解答原子核γSF中长期存在的未解问题，并直接影响人们在核科学中的预测能力。

附：英文原文

Title: Magnetic character of the low-energy enhancement in 70Zn

Author: Ronning, E. K., Richard, A. L., Liddick, S. N., Spyrou, A., Ringle, R., Arora, H., Berg, H. C., Berkman, J. M., Bleuel, D. L., Bosmpotinis, K., Campbell, S. E., Chen, X., Crider, B. P., Coleman, R. J., DeYoung, P. A., Doetsch, A. A., Erington, H., Gaballah, T., Gamage, N. D., Good, E. C., Greaves, B., Hartley, A. C., Huffman, J., Ireland, C. M., Izzo, C., Jain, R., Larsen, A. C., Larsson, J. E. L., Lubna, R. S., Maier, F. M., Mogannam, M. J., Mcher, D., Mumpower, M. R., Owens-Fryar, G., Ogunbeku, T. H., Scriven, D. P., Smith, M. K., Sumithrarachchi, C. S., Sweet, A., Taft, K., Tsantiri, A., Uthayakumaar, S., Wiedeking, M.

Issue&Volume: 2026-07-15

Abstract: The transition of an atomic nucleus from an excited state to a state of lower energy is typically accompanied by the emission of photons. The likelihood of photon emission is a function of the photon energy and of properties of the initial and final nuclear states and is known as the photon (or γ-ray) strength function (γSF)1,2. Of the features present in the γSF, an enhancement in the low-energy region has been observed in some nuclei, but the electromagnetic nature of this enhancement remains an open question3,4. This low-energy enhancement in the γSF significantly impacts our understanding of how elements are created in stars and the structure of the nucleus5,6. Here we present the results from an experiment on the γSF of 70Zn that show that the enhancement in the γSF of this nucleus is of magnetic nature. This observation helps address a long-open question about γSFs in atomic nuclei and directly impacts our predictive capabilities in nuclear science.

DOI: 10.1038/s41586-026-10758-3

Source: https://www.nature.com/articles/s41586-026-10758-3

期刊信息

Nature：《自然》，创刊于1869年。隶属于施普林格·自然出版集团，最新IF：69.504

官方网址：http://www.nature.com/

投稿链接：http://www.nature.com/authors/submit_manuscript.html