Hyperfine Anomalies in Fr: Boundaries of the Spherical Single Particle Model

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 ^{213}Fr). The measurements in five isotopes and a nuclear isomeric state of francium, combined with previous determinations of...

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Bibliographic Details
Published in:Physical review letters 2015-07, Vol.115 (4), p.042501-042501, Article 042501
Main Authors: Zhang, J, Tandecki, M, Collister, R, Aubin, S, Behr, J A, Gomez, E, Gwinner, G, Orozco, L A, Pearson, M R, Sprouse, G D
Format: Article
Language:English
Subjects:
Anomalies
Boundaries
Francium
Isotopes
Magnetization
Nucleons
Spatial distribution
Splitting
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Summary: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 ^{213}Fr). 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 (^{207-213}Fr). 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 nonconservation studies.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.042501