Details
| Original language | English |
|---|---|
| Article number | 233002 |
| Journal | Physical review letters |
| Volume | 134 |
| Issue number | 23 |
| Publication status | Published - 10 Jun 2025 |
Abstract
Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the existence of beyond-standard-model (BSM) interactions that couple electrons and neutrons. However, it is crucial to distinguish higher-order standard model (SM) effects from BSM physics. We measure the IS of the transitions P30→P31 in Ca14+ and S21/2→D5/22 in Ca+ with sub-Hz precision as well as the nuclear mass ratios with relative uncertainties below 4×10-11 for the five stable, even isotopes of calcium (Ca40,42,44,46,48). Combined, these measurements yield a calcium KP nonlinearity with a significance of ∼103σ. Precision calculations show that the nonlinearity cannot be fully accounted for by the expected largest higher-order SM effect, the second-order mass shift, and identify the little-studied nuclear polarization as the only remaining SM contribution that may be large enough to explain it. Despite the observed nonlinearity, we improve existing KP-based constraints on a hypothetical Yukawa interaction for most of the new boson masses between 10 eV/c2 and 107 eV/c2.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Physical review letters, Vol. 134, No. 23, 233002, 10.06.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nonlinear Calcium King Plot Constrains New Bosons and Nuclear Properties
AU - Wilzewski, Alexander
AU - Spieß, Lukas J.
AU - Wehrheim, Malte
AU - Chen, Shuying
AU - King, Steven A.
AU - Micke, Peter
AU - Filzinger, Melina
AU - Steinel, Martin R.
AU - Huntemann, Nils
AU - Benkler, Erik
AU - Schmidt, Piet O.
AU - Huber, Luca I.
AU - Flannery, Jeremy
AU - Matt, Roland
AU - Stadler, Martin
AU - Oswald, Robin
AU - Schmid, Fabian
AU - Kienzler, Daniel
AU - Home, Jonathan
AU - Craik, Diana P.L.Aude
AU - Door, Menno
AU - Eliseev, Sergey
AU - Filianin, Pavel
AU - Herkenhoff, Jost
AU - Kromer, Kathrin
AU - Blaum, Klaus
AU - Yerokhin, Vladimir A.
AU - Valuev, Igor A.
AU - Oreshkina, Natalia S.
AU - Lyu, Chunhai
AU - Banerjee, Sreya
AU - Keitel, Christoph H.
AU - Harman, Zoltán
AU - Berengut, Julian C.
AU - Viatkina, Anna
AU - Gilles, Jan
AU - Surzhykov, Andrey
AU - Rosner, Michael K.
AU - Crespo López-Urrutia, José R.
AU - Richter, Jan
AU - Mariotti, Agnese
AU - Fuchs, Elina
N1 - Publisher Copyright: © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2025/6/10
Y1 - 2025/6/10
N2 - Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the existence of beyond-standard-model (BSM) interactions that couple electrons and neutrons. However, it is crucial to distinguish higher-order standard model (SM) effects from BSM physics. We measure the IS of the transitions P30→P31 in Ca14+ and S21/2→D5/22 in Ca+ with sub-Hz precision as well as the nuclear mass ratios with relative uncertainties below 4×10-11 for the five stable, even isotopes of calcium (Ca40,42,44,46,48). Combined, these measurements yield a calcium KP nonlinearity with a significance of ∼103σ. Precision calculations show that the nonlinearity cannot be fully accounted for by the expected largest higher-order SM effect, the second-order mass shift, and identify the little-studied nuclear polarization as the only remaining SM contribution that may be large enough to explain it. Despite the observed nonlinearity, we improve existing KP-based constraints on a hypothetical Yukawa interaction for most of the new boson masses between 10 eV/c2 and 107 eV/c2.
AB - Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the existence of beyond-standard-model (BSM) interactions that couple electrons and neutrons. However, it is crucial to distinguish higher-order standard model (SM) effects from BSM physics. We measure the IS of the transitions P30→P31 in Ca14+ and S21/2→D5/22 in Ca+ with sub-Hz precision as well as the nuclear mass ratios with relative uncertainties below 4×10-11 for the five stable, even isotopes of calcium (Ca40,42,44,46,48). Combined, these measurements yield a calcium KP nonlinearity with a significance of ∼103σ. Precision calculations show that the nonlinearity cannot be fully accounted for by the expected largest higher-order SM effect, the second-order mass shift, and identify the little-studied nuclear polarization as the only remaining SM contribution that may be large enough to explain it. Despite the observed nonlinearity, we improve existing KP-based constraints on a hypothetical Yukawa interaction for most of the new boson masses between 10 eV/c2 and 107 eV/c2.
UR - http://www.scopus.com/inward/record.url?scp=105007874839&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.134.233002
DO - 10.1103/PhysRevLett.134.233002
M3 - Article
AN - SCOPUS:105007874839
VL - 134
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 23
M1 - 233002
ER -