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Description
This contribution will present the first laser spectroscopy measurements of neutron-rich silicon isotopes from stable 28Si up to 38Si, performed using the Resonance Ionization Spectroscopy Experiment (RISE) at the BEam COoling LAser spectroscopy (BECOLA) facility, located at the Facility for Rare Isotope Beams (FRIB). From the measured isotope shifts and hyperfine structure, we extracted the nuclear magnetic dipole moments of odd-N silicon isotopes and differential mean-square nuclear charge radii of 28-36,38Si.
The silicon isotopic chain, having a proton sub-shell closure at Z=14, serves as an important probe of nuclear structure [1,2], especially in the vicinity of the suggested doubly magic 34Si at N=20, for which recent studies suggest the presence of a central depletion or bubble-like structure in 34Si [3-7]. These results provide a comprehensive study of the evolution of nuclear shell structure and collectivity across N=20, offering an important guide for the development of nuclear theory.
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[2] König, K. et al., Phys. Rev. Lett. 132, 162502 (2024)
[3] Mutschler et al., Nature Phys. 13, 152 (2017)
[4] Sorlin et al., Phys. Lett. B 809, 135740 (2020)
[5] Duguet, T. et al., Phys. Rev. C 95, 034319 (2017)
[6] Zhang, S. et al., arXiv:2411.17462 (2025)
[7] Kay et al., Phys. Rev. Lett.119, 182502 (2017)
This work is supported in part by NSF grant No. PHY-21-11185 and DOE Office of Science Award No. DE-SC0000661.