期刊
NATURE PHYSICS
卷 17, 期 4, 页码 439-+出版社
NATURE RESEARCH
DOI: 10.1038/s41567-020-01136-5
关键词
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资金
- National Key R&D Program of China [2018YFA0404403]
- National Natural Science Foundation of China [11875073]
- BriX Research Program [P7/12]
- FWO-Vlaanderen (Belgium)
- KU Leuven [GOA 15/010]
- ERC Consolidator grant [648381]
- STFC [ST/L005794/1, ST/L005786/1, ST/P004423/1, ST/L002868/1]
- EU Horizon 2020 research and innovation programme through ENSAR2 [654002]
- US Department of Energy, Office of Science, Office of Nuclear Physics [DE-SC0021176, DE-00249237, DE-FG02-96ER40963, DE-SC0018223]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [758027]
- Swedish Research Council [2017-04234]
- Swedish Foundation for International Cooperation in Research and Higher Education (STINT) [IG2012-5158]
- Office of Science of the Department of Energy [DE-AC05-00OR22725]
- STFC [ST/L002868/1, ST/G006415/1, ST/J004189/1, ST/J000159/1, EP/D075769/1, 2023247, ST/P004423/1] Funding Source: UKRI
- U.S. Department of Energy (DOE) [DE-SC0021176] Funding Source: U.S. Department of Energy (DOE)
Nuclear charge radii serve as sensitive probes of the nucleon-nucleon interaction and nuclear matter properties, posing a challenge for nuclear theory. Experimental evidence suggests a new magic neutron number at N=32 in the calcium region, with unexpectedly large increases in charge radii raising questions about nuclear size evolution in neutron-rich systems. Advanced nuclear theories offer different explanations for the odd-even variations and notable increase in charge radii beyond N=28, highlighting limitations in our understanding of neutron-rich systems and issues in current nuclear theory models.
Nuclear charge radii are sensitive probes of different aspects of the nucleon-nucleon interaction and the bulk properties of nuclear matter, providing a stringent test and challenge for nuclear theory. Experimental evidence suggested a new magic neutron number at N = 32 (refs. (1-3)) in the calcium region, whereas the unexpectedly large increases in the charge radii(4,5) open new questions about the evolution of nuclear size in neutron-rich systems. By combining the collinear resonance ionization spectroscopy method with beta-decay detection, we were able to extend charge radii measurements of potassium isotopes beyond N = 32. Here we provide a charge radius measurement of K-52. It does not show a signature of magic behaviour at N = 32 in potassium. The results are interpreted with two state-of-the-art nuclear theories. The coupled cluster theory reproduces the odd-even variations in charge radii but not the notable increase beyond N = 28. This rise is well captured by Fayans nuclear density functional theory, which, however, overestimates the odd-even staggering effect in charge radii. These findings highlight our limited understanding of the nuclear size of neutron-rich systems, and expose problems that are present in some of the best current models of nuclear theory.
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