Hyperfine anomalies in Fr: boundaries of the spherical single particle model

2015/07/16 by J. Zhang, M. Tandecki. R. Collister, Zhang, J. +17
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Nuclear Physics and Applications #Nuclear physics research studies #physics.atom-ph

paper · pdf · doi:10.48550/arxiv.1507.04668

arxiv created 2015/07/16 · openalex publication_date 2015/07/16 · arxiv updated 2015/07/17 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

We have measured the hyperfine splitting of the 7P_1/2 state at the 100 ppm level in Fr isotopes (^{206g,206m, 207, 209, 213, 221}Fr) near the closed neutron shell (N = 126 in ²¹³Fr). The measurements in five isotopes and a nuclear isomeric state of francium, combined with previous determinations of the 7S_1/2 splittings, reveal the spatial distribution of the nuclear magnetization, i.e. the Bohr-Weisskopf effect. We compare our results with a simple shell model consisting of unpaired single valence nucleons orbiting a spherical nucleus, and find good agreement over a range of neutron-deficient isotopes (^207-213Fr). Also, we find near-constant proton anomalies for several even- N isotopes. This identifies a set of Fr isotopes whose nuclear structure can be understood well enough for the extraction of weak interaction parameters from parity non-conservation studies.

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