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Correlations between charge radii differences of mirror nuclei and stellar observables
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The correlation between the charge radii differences in mirror nuclei pairs and the neutron skin thickness has been studied with the so-called finite range simple effective interaction over a wide mass region. The so far precisely measured charge radii difference data within their experimental uncertainty ranges in the 34Ar-34S, 36Ca-36S, 38Ca-38Ar, and 54Ni-54Fe mirror pairs are used to ascertain an upper limit for the slope parameter of the nuclear symmetry energy L ≈ 100 MeV. This limiting value of L is found to be consistent with the upper bound of the NICER PSR J0740+6620 constraint at 1σ level for the radius R1.4 of 1.4M neutron stars. The lower bound of the NICER R1.4 data constrains the lower limit of L to ≈70 MeV. Within the range for L = 70–100 MeV the tidal deformability Lambda1.4 constraint, which is extracted from the GW170817 event at 2σ level, and the recent PREX-2 and CREX data on the neutron skin thickness are discussed.
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BANO, P., et al. Correlations between charge radii differences of mirror nuclei and stellar observables. Physical Review C. 2023. Vol. C108, num. 1, pags. 1-8. ISSN 2469-9985. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/215444