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Charge Radius of the Short-Lived Ni68 and Correlation with the Dipole Polarizability

S. Kaufmann et al.
Phys. Rev. Lett. 124, 132502 – Published 1 April 2020

Abstract

We present the first laser spectroscopic measurement of the neutron-rich nucleus Ni68 at the N=40 subshell closure and extract its nuclear charge radius. Since this is the only short-lived isotope for which the dipole polarizability αD has been measured, the combination of these observables provides a benchmark for nuclear structure theory. We compare them to novel coupled-cluster calculations based on different chiral two- and three-nucleon interactions, for which a strong correlation between the charge radius and dipole polarizability is observed, similar to the stable nucleus Ca48. Three-particle–three-hole correlations in coupled-cluster theory substantially improve the description of the experimental data, which allows to constrain the neutron radius and neutron skin of Ni68.

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  • Received 30 January 2020
  • Revised 6 March 2020
  • Accepted 11 March 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.132502

Published by the American Physical Society under the terms of the 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.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 124, Iss. 13 — 3 April 2020

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