Electromagnetic moments of 215,217Bi: Probing shell evolution beyond N = 126

Andreyev, A. N.; Barzakh, A.; Seliverstov, M.D.; Yue, Z.; Liu, Menglan; Yuan, Cenxi; Algora, A.; Andel, B.; Antalic, S.; Al Monthery, M.; Atanasov, D.; Benito, J.; Benzoni, G.; Berry, T.; Bissell, M.L.; Blaum, K.; Borge, M. J G; Chrysalidis, K.; Clisu, C.; Cocolios, T.E.; Costache, C.; Cubiss, J.G.; Day Goodacre, T.; Farooq-Smith, G.J.; Fedorov, D.V.; Fedosseev, V.N.; Fraile, L.M.; Fynbo, H. O U; Gadelshin, V.; Gaffney, L.P.; Ruiz, R. F Garcia; Granados, C.; Greenlees, P.T.; Harding, R.D.; Harkness-Brennan, L.J.; Heinke, R.; Herlert, A.; Huyse, M.; Illana, A.; Jolie, J.; Judson, D.S.; Karls, J.; Konki, J.; Larmonier, P.; Lazarus, I.; Leimbach, D.; Lică, R.; Liu, Z.; Lunney, D.; Lynch, K.M.; Madurga, M.; Manea, V.; Marginean, N.; Marginean, R.; Marsh, B.A.; Mihai, C.; Molkanov, P.; Mosat, P.; Mougeot, M.; Murias, J.R.; Nacher, E.; Negret, A.; Neidherr, D.; Nies, L.; Page, R.D.; Pascu, S.; Perea, A.; Pucknell, V.; Rahkila, P.; Raison, C.; Rapisarda, E.; Rezynkina, K.; Rosenbush, M.; Rossel, R.E.; Rothe, S.; Sánchez-Tembleque, V.; Schomacker, K.; Schweikhard, L.; Seiffert, C.; Sels, S.; Sotty, C.; Stan, L.; Stryjczyk, M.; Studer, D.; Sundberg, J.; Sürder, C.; Tengblad, O.; Van Duppen, P.; Vedia, V.; Verlinde, M.; Viñals, S.; Warr, N.; Welker, A.; Wienholtz, F.; Wolf, R.N.

doi:10.1016/j.physletb.2025.140013

Electromagnetic moments of ^215,217Bi: Probing shell evolution beyond N = 126

Journal Article · Thu Nov 06 19:00:00 EST 2025 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2025.140013· OSTI ID:3003383

^[1]; ; Seliverstov, M.D.; ; ; ; Algora, A.; ; ; ; Atanasov, D.; Benito, J.; Benzoni, G.; Berry, T.; Bissell, M.L.; ; Borge, M. J G; Chrysalidis, K.; Clisu, C.; more »

University of York (United Kingdom); et al.

The nuclear properties of bismuth isotopes (Z = 83) , with just one valence proton above the closed spherical shell at (Z = 82) , are expected to be governed by a single unpaired proton. However, already in semimagic ²⁰⁹Bi (Z = 83, N = 126) , , the magnetic moment (μ) strongly deviates from the single-particle Schmidt value. A near linear decrease in μ with the increase of N after the N = 126 magic number was observed up to N = 130 . In order to test whether this trend is kept at N > 130 and to reveal the underlying mechanisms, an investigation of ^215,217Bi (N = 132, 134) has been undertaken. The magnetic dipole and electric quadrupole moments of the I^π = 9/2^- nuclear ground states in these isotopes have been measured for the first time using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). It has been shown that the linearly decreasing trend of μ(^209,211,213Bi^g) is broken in ^215,217Bi with a nearly constant value of μ observed. Experimental data have been compared to calculations in the framework of the configuration-interaction shell model with the monopole-based universal V_MU+LS interaction. The peculiarities in the behavior of μ(Bi, 9/2^- ) with increasing neutron number are explained as being due to the shell evolution, change of the neutron orbitals occupancies and strong configuration mixing beyond N = 130 . Also, the difference in the μ trends for bismuth (Z = 83) and astatine (Z = 85) isotopes with N > 126 are reproduced by the shell-model calculations. It is shown that monopole interaction plays noticeable role in the description of the peculiarities of the μ behaviour. Additionally, the extension of the application of the V_MU interaction to the μ isotopic trends for heavy nuclei is important for further study of the capabilities of this promising version of the shell-model calculations.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Natural Science Foundation of China; Federal Ministry of Education and Research Bonn Office; España Ministerio de Ciencia e Innovación

Grant/Contract Number:: SC0021176

OSTI ID:: 3003383

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 871; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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