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标题: "Laser spectroscopy illuminates the $N=32$ shell closure"
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---

## Nuclear Theory

## Title:Laser spectroscopy illuminates the $N=32$ shell closure

Authors:[Tim E. Lellinger](https://arxiv.org/search/nucl-th?searchtype=author&query=Lellinger,+T+E), [Liss V. Rodriguez](https://arxiv.org/search/nucl-th?searchtype=author&query=Rodriguez,+L+V), [Patrick Muller](https://arxiv.org/search/nucl-th?searchtype=author&query=Muller,+P), [Osama Ahmad](https://arxiv.org/search/nucl-th?searchtype=author&query=Ahmad,+O), [Mark L. Bissell](https://arxiv.org/search/nucl-th?searchtype=author&query=Bissell,+M+L), [Klaus Blaum](https://arxiv.org/search/nucl-th?searchtype=author&query=Blaum,+K), [Emily Burbach](https://arxiv.org/search/nucl-th?searchtype=author&query=Burbach,+E), [Bradley Cheal](https://arxiv.org/search/nucl-th?searchtype=author&query=Cheal,+B), [Till Fabritz](https://arxiv.org/search/nucl-th?searchtype=author&query=Fabritz,+T), [Ronald F. Garcia Ruiz](https://arxiv.org/search/nucl-th?searchtype=author&query=Ruiz,+R+F+G), [Matthias Heinz](https://arxiv.org/search/nucl-th?searchtype=author&query=Heinz,+M), [Jack Hughes](https://arxiv.org/search/nucl-th?searchtype=author&query=Hughes,+J), [Phillip Imgram](https://arxiv.org/search/nucl-th?searchtype=author&query=Imgram,+P), [Kristian Konig](https://arxiv.org/search/nucl-th?searchtype=author&query=Konig,+K), [Yinshen Liu](https://arxiv.org/search/nucl-th?searchtype=author&query=Liu,+Y), [Bernhard Maass](https://arxiv.org/search/nucl-th?searchtype=author&query=Maass,+B), [Edward N. Matthews](https://arxiv.org/search/nucl-th?searchtype=author&query=Matthews,+E+N), [Takayuki Miyagi](https://arxiv.org/search/nucl-th?searchtype=author&query=Miyagi,+T), [Witold Nazarewicz](https://arxiv.org/search/nucl-th?searchtype=author&query=Nazarewicz,+W), [Rainer Neugart](https://arxiv.org/search/nucl-th?searchtype=author&query=Neugart,+R), [Gerda Neyens](https://arxiv.org/search/nucl-th?searchtype=author&query=Neyens,+G), [Lukas Nies](https://arxiv.org/search/nucl-th?searchtype=author&query=Nies,+L), [Wilfried Nortershauser](https://arxiv.org/search/nucl-th?searchtype=author&query=Nortershauser,+W), [Julian Palmes](https://arxiv.org/search/nucl-th?searchtype=author&query=Palmes,+J), [Peter Plattner](https://arxiv.org/search/nucl-th?searchtype=author&query=Plattner,+P), [Paul-Gerhard Reinhard](https://arxiv.org/search/nucl-th?searchtype=author&query=Reinhard,+P), [Laura Renth](https://arxiv.org/search/nucl-th?searchtype=author&query=Renth,+L), [Rodolfo Sanchez](https://arxiv.org/search/nucl-th?searchtype=author&query=Sanchez,+R), [Achim Schwenk](https://arxiv.org/search/nucl-th?searchtype=author&query=Schwenk,+A), [Julien Spahn](https://arxiv.org/search/nucl-th?searchtype=author&query=Spahn,+J), [Xiaofei Yang](https://arxiv.org/search/nucl-th?searchtype=author&query=Yang,+X), [Deyan T. Yordanov](https://arxiv.org/search/nucl-th?searchtype=author&query=Yordanov,+D+T)

[View PDF](https://arxiv.org/pdf/2608.10943) [HTML (experimental)](https://arxiv.org/html/2608.10943v1)

> Abstract:Atomic nuclei are strongly correlated quantum many-body systems, and how their shell structure evolves with increasing neutron excess remains a central open question in nuclear physics. Calcium isotopes are an ideal testing ground: alongside the traditional magic numbers $N=20,28$, new shell closures have been proposed at $N=32,34$ ($^{52,54}\mathrm{Ca}$). While the charge radius rises rapidly towards $N=32$, further moments and radii in the isotopic chain have remained inaccessible due to the low production yield of a few ions per second. Here we apply a highly sensitive collinear laser spectroscopy technique, which reveals a strikingly simple behaviour: adding one neutron to $^{52}\mathrm{Ca}$ yields a pure single-particle magnetic dipole moment in $^{53}\mathrm{Ca}$, while the charge-radius slope towards $^{54}\mathrm{Ca}$ exceeds that towards $^{52}\mathrm{Ca}$. This provides strong evidence for a robust $N=32$ shell closure and stringently constrains nuclear structure models.

| Subjects: | Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph) |
| --- | --- |
| Cite as: | [arXiv:2608.10943](https://arxiv.org/abs/2608.10943) \[nucl-th\] |
|  | (or [arXiv:2608.10943v1](https://arxiv.org/abs/2608.10943v1) \[nucl-th\] for this version) |
|  | [https://doi.org/10.48550/arXiv.2608.10943](https://doi.org/10.48550/arXiv.2608.10943) |

## Submission history

From: Liss Vazquez Rodriguez \[[view email](https://arxiv.org/show-email/1013e085/2608.10943)\]  
**\[v1\]** Tue, 11 Aug 2026 14:14:50 UTC (2,522 KB)

[Which authors of this paper are endorsers?](https://arxiv.org/auth/show-endorsers/2608.10943) | Disable MathJax ([What is MathJax?](https://info.arxiv.org/help/mathjax.html))
