Magnetism of an Excited Self-Conjugate Nucleus: Precise Measurement of the g Factor of the 2(1)(+) State in Mg-24

A.E Stuchbery G. Georgiev 1 B. Brown A. Goasduff 1 L. Atanasova D.L. Balabanski M. Bostan M. Danchev P. Detistov K.A. Gladnishki J. Ljungvall 1 I. Matea 2 D. Radeck C. Sotty 1 I. Stefan 2 D. Verney 2 D.T. Yordanov 2 A. Kusoglu
1 CSNSM SNO
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : A precise measurement of the g factor of the first-excited state in the self-conjugate (N = Z) nucleus Mg-24 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.
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Physical Review Letters, American Physical Society, 2015, 114 (Issue 6), pp.062501. 〈10.1103/PhysRevLett.114.062501〉
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Soumis le : mercredi 1 avril 2015 - 10:54:11
Dernière modification le : jeudi 11 janvier 2018 - 06:26:24

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A.E Stuchbery, G. Georgiev, B. Brown, A. Goasduff, L. Atanasova, et al.. Magnetism of an Excited Self-Conjugate Nucleus: Precise Measurement of the g Factor of the 2(1)(+) State in Mg-24. Physical Review Letters, American Physical Society, 2015, 114 (Issue 6), pp.062501. 〈10.1103/PhysRevLett.114.062501〉. 〈in2p3-01136183〉

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