Laser Spectroscopy of Neutron-Rich Tin Isotopes: A Discontinuity in Charge Radii across the N=82 Shell Closure



Gorges, C, Rodriguez, LV, Balabanski, DL, Bissell, ML, Blaum, K, Cheal, B, Ruiz, RF Garcia, Georgiev, G, Gins, W, Heylen, H
et al (show 21 more authors) (2019) Laser Spectroscopy of Neutron-Rich Tin Isotopes: A Discontinuity in Charge Radii across the N=82 Shell Closure. PHYSICAL REVIEW LETTERS, 122 (19).

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Abstract

The change in mean-square nuclear charge radii δ⟨r2⟩ along the even-A tin isotopic chain 108−134Sn has been investigated by means of collinear laser spectroscopy at ISOLDE/CERN using the atomic transitions 5p2 1S0→5p6 s1P1 and 5p2 3P0→5p6s 3P1. With the determination of the charge radius of 134Sn and corrected values for some of the neutron-rich isotopes, the evolution of the charge radii across the N=82 shell closure is established. A clear kink at the doubly magic 132Sn is revealed, similar to what has been observed at N=82 in other isotopic chains with larger proton numbers, and at the N=126 shell closure in doubly magic 208Pb. While most standard nuclear density functional calculations struggle with a consistent explanation of these discontinuities, we demonstrate that a recently developed Fayans energy density functional provides a coherent description of the kinks at both doubly magic nuclei, 132Sn and 208Pb, without sacrificing the overall performance. A multiple correlation analysis leads to the conclusion that both kinks are related to pairing and surface effects.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 15 Aug 2019 08:23
Last Modified: 22 Jan 2021 12:34
DOI: 10.1103/PhysRevLett.122.192502
Open Access URL: https://journals.aps.org/prl/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3051792

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