A1 Journal article (refereed)
Precision measurement of the magnetic octupole moment in 45Sc as a test for state-of-the-art atomic- and nuclear-structure theory (2022)

de Groote, R.P., Moreno, J., Dobaczewsk, I. J., Koszorús, Á., Moore, I., Reponen, M., Sahoo, B.K., & Yuan, C. (2022). Precision measurement of the magnetic octupole moment in 45Sc as a test for state-of-the-art atomic- and nuclear-structure theory. Physics Letters B, 827, Article 136930. https://doi.org/10.1016/j.physletb.2022.136930

JYU authors or editors

Publication details

All authors or editors: de Groote, R.P.; Moreno, J.; Dobaczewsk,i J.; Koszorús, Á.; Moore, I.; Reponen, M.; Sahoo, B.K.; Yuan, C.

Journal or series: Physics Letters B

ISSN: 0370-2693

eISSN: 1873-2445

Publication year: 2022

Volume: 827

Article number: 136930

Publisher: Elsevier BV

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.physletb.2022.136930

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/79645

Publication is parallel published: https://arxiv.org/abs/2005.00414


We report on measurements of the hyperfine A, B and C -constants of the 3d4s2 2 D5/2 and 3d4s2
2 D3/2 atomic states in 45Sc. High-precision atomic calculations of the hyperfine fields of these states
and second-order corrections are performed, and are used to extract C5/2 = −0.06(6) kHz and C3/2 =
+0.04(3) kHz from the data. These results are one order of magnitude more precise than the available
literature. From the combined analysis of both atomic states, we infer the nuclear magnetic octupole
moment Ω = −0.07(53)μN b, including experimental and atomic structure-related uncertainties. With a
single valence proton outside of a magic calcium core, scandium is ideally suited to test a variety of
nuclear models, and to investigate in-depth the many intriguing nuclear structure phenomena observed
within the neighbouring isotopes of calcium. We perform nuclear shell-model calculations of Ω, and
furthermore explore the use of Density Functional Theory for evaluating Ω. From this, mutually consistent
theoretical values of Ω are obtained, which are in agreement with the experimental value. This confirms
atomic structure calculations possess the accuracy and precision required for magnetic octupole moment
measurements, and shows that modern nuclear theory is capable of providing meaningful insight into
this largely unexplored observable.

Keywords: nuclear physics; density functional theory

Free keywords: octupole; nuclear structure; nuclear density functional theory

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Ministry reporting: Yes

Reporting Year: 2022

Preliminary JUFO rating: 2

Last updated on 2022-14-09 at 12:12