Magnetic moments of thallium isotopes in the vicinity of magic N = 126

• DOI: 10.1016/j.physletb.2024.138452
• Publication Date: 2024-01-17T16:46:32Z
• Authors: Z. Yue; A.N. Andreyev; A.E. Barzakh; I.N. Borzov; J.G. Cubiss; A. Algora; M. Au; M. Balogh; S. Bara; R.A. Bark; C. Bernerd; M.J.G. Borge; D. Brugnara; K. Chrysalidis; T.E. Cocolios; H. De Witte; Z. Favier; L.M. Fraile; H.O.U. Fynbo; A. Gottardo; R. Grzywacz; R. Heinke; A. Illana; P.M. Jones; D.S. Judson; A. Korgul; U. Köster; M. Labiche; L. Le; R. Lica; M. Madurga; N. Marginean; B. Marsh; C. Mihai; E. Nácher; C. Neacsu; C. Nita; B. Olaizola; J.N. Orce; C.A.A. Page; R.D. Page; J. Pakarinen; P. Papadakis; G. Penyazkov; A. Perea; M. Piersa-Siłkowska; Zs. Podolyák; S.D. Prosnyak; E. Reis; S. Rothe; M. Sedlak; L.V. Skripnikov; C. Sotty; S. Stegemann; O. Tengblad; S.V. Tolokonnikov; J.M. Udías; P. Van Duppen; N. Warr; W. Wojtaczka
• Keywords: isotoopit; hyperfine structure; Physics; QC1-999; spektroskopia; Theory of finite Fermi systems; Magnetic dipole moments; Physik (inkl. Astronomie); theory of finite Fermi systems; Physical sciences; laser spectroscopy; Hyperfine structure; magnetismi; Laser spectroscopy; magnetic dipole moments

The work was supported by the STFC Grants Nos. ST/V001035/1, ST/V001108/1, ST/V001027/1 and ST/P004598/1, by the Romanian Nucleu project No. PN 23 21 01 02 and Institutul de Fizica˘ Atomica˘ (IFA) grant CERN/ISOLDE, by the Research Foundation Flanders (FWO, Belgium), by BOF KU Leuven (C14/22/104), by the Spanish funding agency MICIN/AEI (FEDER, EU) via projects Nos. RTI2018-098868-B-I00 and PID2021-126998OBI00, by German BMBF under contract 05P21PKCI1 and Verbundprojekt 05P2021, by the Polish Ministry of Education and Science under Contract No. 2021/WK/07, and by the Polish National Science Center under Grant No. 2020/39/B/ST2/02346. M. Au acknowledges funding from the European’s Union Horizon 2020 Research and Innovation Program under grant agreement number 861198 project ‘LISA’ (Laser Ionization and Spectroscopy of Actinides) Marie Skłodowská-Curie Innovative Training Network (ITN). M. Piersa-Siłkowska acknowledges funding from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie grant agreement No. 101032999, “BeLaPEx”.<br/>Peer reviewed<br/>The magnetic dipole moments (μ) of 209Tlg (N=128) and 207Tlm (N=126) have been measured for the first time using the in-source laser resonance-ionization spectroscopy technique with the Laser Ion Source and Trap (LIST) at ISOLDE (CERN). The application of the LIST suppresses the usually overwhelming background of the isobaric francium isotopes and allows access to heavy thallium isotopes with A⩾207. The self-consistent theory of finite Fermi systems based on the energy density functional by Fayans et al. well describes the N dependence of μ for 1/2+ thallium ground states, as well as μ for the 11/2− isomeric states in europium, gold and thallium isotopes. The inclusion of particle-vibration coupling leads to a better agreement between the theory and experiment for μ(Tlg, Iπ=1/2+). It is shown that beyond mean-field contributions to μ cannot be neglected at least for thallium isotopes with Iπ=1/2+.<br/>7 pags., 3 figs., 1 tab.<br/>