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Laser spectroscopy of neutron-rich 207,208Hg isotopes: Illuminating the kink and odd-even staggering in charge radii across the N=126 shell closure

MPS-Authors
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Atanasov,  D.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum,  K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Manea,  V.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Wolf,  R. N.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

Fulltext (public)

2012.13802.pdf
(Preprint), 3MB

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Citation

Day Goodacre, T., Afanasjev, A. V., Barzakh, A. E., Marsh, B. A., Sels, S., Ring, P., et al. (2021). Laser spectroscopy of neutron-rich 207,208Hg isotopes: Illuminating the kink and odd-even staggering in charge radii across the N=126 shell closure. Physical Review Letters, 126(3): 032502. doi:10.1103/PhysRevLett.126.032502.


Cite as: http://hdl.handle.net/21.11116/0000-0007-D2E6-8
Abstract
The mean-square charge radii of 207,208Hg (Z=80, N=127, 128) have been studied for the first time and those of 202,203,206Hg (N=122, 123, 126) remeasured by the application of in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). The characteristic kink in the charge radii at the N=126 neutron shell closure has been revealed, providing the first information on its behavior below the Z=82 proton shell closure. A theoretical analysis has been performed within relativistic Hartree-Bogoliubov and nonrelativistic Hartree-Fock-Bogoliubov approaches, considering both the new mercury results and existing lead data. Contrary to previous interpretations, it is demonstrated that both the kink at N=126 and the odd-even staggering (OES) in its vicinity can be described predominately at the mean-field level and that pairing does not need to play a crucial role in their origin. A new OES mechanism is suggested, related to the staggering in the occupation of the different neutron orbitals in odd- and even-A nuclei, facilitated by particle-vibration coupling for odd-A nuclei.