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Zhang J, Tandecki M, Collister R, Aubin S, Behr JA, Gomez E, Gwinner G, Orozco LA, Pearson MR, Sprouse GD. Hyperfine Anomalies in Fr: Boundaries of the Spherical Single Particle Model. PHYSICAL REVIEW LETTERS 2015; 115:042501. [PMID: 26252677 DOI: 10.1103/physrevlett.115.042501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Indexed: 06/04/2023]
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 ^{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.
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Affiliation(s)
- J Zhang
- Department of Physics, Joint Quantum Institute, University of Maryland, and National Institute of Standards and Technology, College Park, Maryland 20742, USA
| | - M Tandecki
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - R Collister
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - S Aubin
- Department of Physics, College of William and Mary, Williamsburg, Virginia 2319, USA
| | - J A Behr
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - E Gomez
- Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78290, México
| | - G Gwinner
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - L A Orozco
- Department of Physics, Joint Quantum Institute, University of Maryland, and National Institute of Standards and Technology, College Park, Maryland 20742, USA
| | - M R Pearson
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - G D Sprouse
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
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