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Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

H. L. Crawford et al.
Phys. Rev. Lett. 129, 212501 – Published 14 November 2022
Physics logo See Viewpoint: Probing the Limits of Nuclear Existence

Abstract

New half-lives for exotic isotopes approaching the neutron drip-line in the vicinity of N28 for Z=1215 were measured at the Facility for Rare Isotope Beams (FRIB) with the FRIB decay station initiator. The first experimental results are compared to the latest quasiparticle random phase approximation and shell-model calculations. Overall, the measured half-lives are consistent with the available theoretical descriptions and suggest a well-developed region of deformation below Ca48 in the N=28 isotones. The erosion of the Z=14 subshell closure in Si is experimentally confirmed at N=28, and a reduction in the Mg38 half-life is observed as compared with its isotopic neighbors, which does not seem to be predicted well based on the decay energy and deformation trends. This highlights the need for both additional data in this very exotic region, and for more advanced theoretical efforts.

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  • Received 19 July 2022
  • Accepted 14 September 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.212501

© 2022 American Physical Society

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Nuclear Physics

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Probing the Limits of Nuclear Existence

Published 16 November 2022

Researchers have discovered the heaviest-known bound isotope of sodium and characterized other neutron-rich isotopes, offering important benchmarks for refining nuclear models.

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Vol. 129, Iss. 21 — 18 November 2022

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