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König K, Fritzsche S, Hagen G, Holt JD, Klose A, Lantis J, Liu Y, Minamisono K, Miyagi T, Nazarewicz W, Papenbrock T, Pineda SV, Powel R, Reinhard PG. Surprising Charge-Radius Kink in the Sc Isotopes at N=20. PHYSICAL REVIEW LETTERS 2023; 131:102501. [PMID: 37739365 DOI: 10.1103/physrevlett.131.102501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/10/2023] [Accepted: 06/21/2023] [Indexed: 09/24/2023]
Abstract
Charge radii of neutron deficient ^{40}Sc and ^{41}Sc nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number N=20 and shows a pronounced kink, generally taken as a signature of a shell closure, but one notably absent in the neighboring Ca, K, and Ar isotopic chains. Theoretical models that explain the trend at N=20 for the Ca isotopes cannot reproduce this puzzling behavior.
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Affiliation(s)
- Kristian König
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Nuclear Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Stephan Fritzsche
- Helmholtz Institute Jena, 07743 Jena, Germany
- Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - Gaute Hagen
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Jason D Holt
- TRIUMF, Vancouver, British Colombia, V6T 2A3, Canada
- Department of Physics, McGill University, Montréal, Quebec, H3A 2T8, Canada
| | - Andrew Klose
- Department of Chemistry and Biochemistry, Augustana University, Sioux Falls, South Dakota 57197, USA
| | - Jeremy Lantis
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - Yuan Liu
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - Kei Minamisono
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Takayuki Miyagi
- Department of Nuclear Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Witold Nazarewicz
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Thomas Papenbrock
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Skyy V Pineda
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - Robert Powel
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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Gebert F, Wan Y, Wolf F, Angstmann CN, Berengut JC, Schmidt PO. Precision Isotope Shift Measurements in Calcium Ions Using Quantum Logic Detection Schemes. PHYSICAL REVIEW LETTERS 2015; 115:053003. [PMID: 26274418 DOI: 10.1103/physrevlett.115.053003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Indexed: 06/04/2023]
Abstract
We demonstrate an efficient high-precision optical spectroscopy technique for single trapped ions with nonclosed transitions. In a double-shelving technique, the absorption of a single photon is first amplified to several phonons of a normal motional mode shared with a cotrapped cooling ion of a different species, before being further amplified to thousands of fluorescence photons emitted by the cooling ion using the standard electron shelving technique. We employ this extension of the photon recoil spectroscopy technique to perform the first high precision absolute frequency measurement of the 2D(3/2)→2P(1/2) transition in calcium, resulting in a transition frequency of f=346 000 234 867(96) kHz. Furthermore, we determine the isotope shift of this transition and the 2S(1/2)→2P(1/2) transition for 42Ca+, 44Ca+, and 48Ca+ ions relative to 40Ca+ with an accuracy below 100 kHz. Improved field and mass shift constants of these transitions as well as changes in mean square nuclear charge radii are extracted from this high resolution data.
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Affiliation(s)
- Florian Gebert
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
| | - Yong Wan
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
| | - Fabian Wolf
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
| | - Christopher N Angstmann
- School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Julian C Berengut
- School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Piet O Schmidt
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
- Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
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Yuan X, Panigrahy SN, Dougherty RW, Das TP, Andriessen J. Hyperfine structures of Ca+ and Sr+ ions: Summary of trends in hyperfine interactions in the alkaline-earth-metal ions and corresponding series with similar electronic structures. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:197-207. [PMID: 9912237 DOI: 10.1103/physreva.52.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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