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SUMMARY:The nature of isotopic anomalies in charge radii and atomic isomer
  shifts at N=126 region.
DTSTART;VALUE=DATE-TIME:20261028T125000Z
DTEND;VALUE=DATE-TIME:20261028T130500Z
DTSTAMP;VALUE=DATE-TIME:20261101T051217Z
UID:indico-contribution-6345@cern.ch
DESCRIPTION:Speakers: Ivan Borzov (National Research Centre "Kurchatov Ins
 titute")\nThe nature of isotopic anomalies in charge radii and atomic isom
 er shifts \nat N=126 region.\n\nI.N. Borzov\, 1\, 2\, S.S. Pankratov\, 1\,
 3\n1) National Research Centre”Kurchatov Institute”\, Moscow\, Russia 
 \n2) Bogolubov Laboratory of Theoretical Physics\, JINR\, Dubna\, Russia \
 n3) Moscow Institute of Physics and Technology\, Dolgoprydny\, Russia\n\nT
 he nuclear charge ms-radii and atomic isomer shift for the 211-219Bi isoto
 pes are calculated within the self-consistent finite Fermi systems theory 
 using the Fayans functional FaNDF0. A special attention is paid to the ano
 malous part of the functional. In contrast to our previous calculations [1
 ]\, the full Hartree-Fock-Bogolubov (HFB) formalism is employed with the n
 on-diagonal pairing.\n   The main impact on the kink in the isotopic depen
 dence of radii at N=126\, as well as on the isomer shifts comes from the o
 ccupancy factors of the neutron discrete and continuum quasiparticle state
 s with principal quantum number n = 1\, as well as the neutron pairing con
 tribution to the proton central mean field potential. In contrast\, in th
 e RMF framework [2] the kink is determined exclusively by the contribution
  of the ν1i11/2 orbital assuming it is inverted with respect to the ν2g9
 /2 orbital which is not supported by the experiment. Importantly\, our cal
 culations successfully describe the unexpected negative isomer shift in 21
 5Bi observed recently at ISOLDE (CERN) [3].\n\n1. I.N. Borzov\, S.V. Tolok
 onnikov\, Physics of Atomic Nuclei 87\, 423 (2024).\n2. U. C. Perera \, A.
  V. Afanasjev\, and P. Ring. Phys.Rev. C 104\, 064313 (2021).\n3. M.D. Sel
 iverstov\, A. Barzakh\, D. Fedorov\, P. Molkanov\, and V. Panteleev\, \nPr
 oceedings of the XXIV International Conference “Nucleus -2024”\, 1–5
  July (Dubna\, 2024).\n\nhttps://indico.particle.mephi.ru/event/626/contri
 butions/6345/
LOCATION: Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6345/
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