Magnetism of an excited self-conjugate nucleus: precise measurement of the g factor of the 2(1)(+) state in (24)Mg.
A precise measurement of the g factor of the first-excited state in the self-conjugate (N=Z) nucleus (24)Mg is performed by a new time-differential recoil-in-vacuum method based on the hyperfine field of hydrogenlike ions. Theory predicts that the g factors of such states, in which protons and neutrons occupy the same orbits, should depart from 0.5 by a few percent due to configuration mixing and meson-exchange effects. The experimental result, g=0.538±0.013, is in excellent agreement with recent shell-model calculations and shows a departure from 0.5 by almost 3 standard deviations, thus achieving, for the first time, the precision and accuracy needed to test theory. Proof of the new method opens the way for wide applications including measurements of the magnetism of excited states of exotic nuclei produced as radioactive beams.
CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France and Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey.
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Kusoglu
Department of Nuclear Physics, RSPE, Australian National University, Canberra, Australian Capital Territory 2601, Australia.
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Stuchbery
CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France.
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Georgiev
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
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Brown
CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France.
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Goasduff
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria.
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Atanasova
ELI-NP, Horia Hulubei National Institute of Physics and Nuclear Engineering, 077125 Magurele, Romania.
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Balabanski
Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey.
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Bostan
Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria.
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Danchev
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria.
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Detistov
Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria.
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Gladnishki
CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France.
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Ljungvall
IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France.
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Matea
Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Köln, Germany.
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Radeck
CSNSM, CNRS/IN2P3; Université Paris-Sud, UMR8609, F-91405 Orsay-Campus, France.
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Sotty
IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France.
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Stefan
IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France.
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Verney
IPN, Orsay, CNRS/IN2P3, Université Paris-Sud, F-91406 Orsay Cedex, France and Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany and CERN European Organization for Nuclear Research, Physics Department, CH-1211 Geneva 23, Switzerland.
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Yordanov