High-Precision Mass Measurements of 52Ni and 51Co Reveal Breakdown of the Isobaric Multiplet Mass Equation in the f p Shell
Abstract
We performed high-precision mass measurements of the proton-rich nuclei 52Ni and 51Co with the LEBIT Penning trap at the Facility for Rare Isotope Beams (FRIB). For 52Ni, a mass excess of $-22474.8(2.2)$~keV was determined, which is consistent with a recent storage-ring measurement at the Cooler-Storage Ring (CSRe) but has a factor 37 improved precision. For 51Co, we obtained a mass excess of $-27375.1(5.7)$~keV, agreeing with a recent CSRe result, while reducing the uncertainty by a factor~2. Combining our mass value for 52Ni with the known two-proton decay energy of 54Zn, we determined the mass excess of 54Zn to be $-6463(42)$~keV. These new mass values reveal a substantial breakdown of the isobaric mass multiplet equation for A=52 and A=54, and provide stringent benchmarks for isospin-symmetry-breaking effects in the proton-rich fp-shell, favoring theoretical descriptions that omit the Coulomb-exchange term.
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BibTeX
@misc{maier2026highprecision,
title = {{High-Precision Mass Measurements of 52Ni and 51Co Reveal Breakdown of the Isobaric Multiplet Mass Equation in the f p Shell}},
author = {F. M. Maier and G. Bollen and B. A. Brown and S. E. Campbell and X. Chen and H. Erington and N. D. Gamage and K. Godbey and C. M. Ireland and C. Izzo and R. Ringle and C. S. Sumithrarachchi and A. C. C. Villari},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.09986},
eprint = {2607.09986},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.09986},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - High-Precision Mass Measurements of 52Ni and 51Co Reveal Breakdown of the Isobaric Multiplet Mass Equation in the f p Shell
AU - F. M. Maier
AU - G. Bollen
AU - B. A. Brown
AU - S. E. Campbell
AU - X. Chen
AU - H. Erington
AU - N. D. Gamage
AU - K. Godbey
AU - C. M. Ireland
AU - C. Izzo
AU - R. Ringle
AU - C. S. Sumithrarachchi
AU - A. C. C. Villari
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2607.09986
UR - https://arxiv.org/abs/2607.09986
AB - We performed high-precision mass measurements of the proton-rich nuclei ^52Ni and ^51Co with the LEBIT Penning trap at the Facility for Rare Isotope Beams (FRIB). For ^52Ni, a mass excess of $-22474.8(2.2)$~keV was determined, which is consistent with a recent storage-ring measurement at the Cooler-Storage Ring (CSRe) but has a factor 37 improved precision. For ^51Co, we obtained a mass excess of $-27375.1(5.7)$~keV, agreeing with a recent CSRe result, while reducing the uncertainty by a factor~2. Combining our mass value for ^52Ni with the known two-proton decay energy of ^54Zn, we determined the mass excess of ^54Zn to be $-6463(42)$~keV. These new mass values reveal a substantial breakdown of the isobaric mass multiplet equation for A=52 and A=54, and provide stringent benchmarks for isospin-symmetry-breaking effects in the proton-rich fp-shell, favoring theoretical descriptions that omit the Coulomb-exchange term.
ER -